MAX9789AETJ+ - Maxim Integrated

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-0606; Rev 3; 9/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX9789/MAX9790 combine a stereo, 2W Class AB

speaker power amplifier with a stereo 100mW

DirectDrive®headphone amplifier in a single device. The

MAX9789/MAX9790 are designed for use with the

Microsoft Windows Vista®operating system and are fully

compliant with Microsoft’s Windows Vista specifications.

The headphone amplifier features Maxim’s DirectDrive

architecture that produces a ground-referenced output

from a single supply to eliminate the need for large DC-

blocking capacitors, as well as save cost, board space,

and component height. A high +90dB PSRR and low

0.002% THD+N ensures clean, low-distortion amplifica-

tion of the audio signal.

Separate speaker and headphone amplifier control

inputs provide independent shutdown of the speaker

and headphone amplifiers, allowing speaker and head-

phone amplifiers to be active simultaneously, if

required. The industry-leading click-and-pop suppres-

sion circuitry reduces audible transients during startup

and shutdown cycles.

The MAX9789 features an internal LDO that can be used

as a clean power supply for a CODEC or other circuits.

The LDO output voltage is set internally at 4.75V or can

be adjusted between 1.21V and 4.75V using a simple

resistive divider. The LDO is protected against thermal

overloads and short circuits while providing 120mA of

continuous output current and can be enabled indepen-

dently of the audio amplifiers.

By disabling the speaker and headphone amplifiers, and

the LDO (for MAX9789), the MAX9789/MAX9790 enter

low-power shutdown mode and draw only 0.3µA.

The MAX9789/MAX9790 operate from a single 4.5V to

5.5V supply and feature thermal-overload and output

short-circuit protection. Devices are specified over the

-40°C to +85°C extended temperature range.

Features

Applications

Note: All devices are specified over the -40°C to +85°C extended

temperature range.

Denotes a lead-free/RoHS-compliant package.

EP = Exposed pad.

Future product—contact factory for availability.

PART

PIN-PACKAGE

INTERNAL LDO

tON (ms)

MAX9789AETJ+

32 TQFN-EP*

Yes 100

MAX9789BETJ+**

32 TQFN-EP*

Yes 25

MAX9789CETJ+

32 TQFN-EP*

Yes 100

MAX9790AETJ+

32 TQFN-EP*

No 100

MAX9790BETJ+**

32 TQFN-EP*

No 25

Simplified Block Diagrams

MAX9789

SPKR_EN

HP_EN

MUTE

GAIN1

GAIN2

SPEAKER SUPPLY

4.5V TO 5.5V

HEADPHONE SUPPLY

3.0V TO 5.5V

LDO

4.5V TO 5.5V

SPKR_INR

SPKR_INL

HP_INR

HP_INL

1.21V TO 4.75V

♦Microsoft Windows Vista Compliant

♦Class AB 2W Stereo BTL Speaker Amplifier

♦100mW DirectDrive Headphone Amplifier

Eliminates Costly, Bulky DC-Blocking Capacitors

♦Excellent RF Immunity

♦Integrated 120mA LDO (MAX9789)

♦High +90dB PSRR, Low 0.002% THD+N

♦Low-Power Shutdown Mode

♦Click-and-Pop Suppression

♦Short-Circuit and Thermal-Overload Protection

♦Available in 32-Pin Thin QFN (5mm x 5mm x

0.8mm) Package

Notebook Computers

Tablet PCs

Portable Multimedia Players

Windows Vista is a registered trademark of Microsoft Corp.

Pin Configurations appear at end of data sheet.

Simplified Block Diagrams continued at end of data sheet.

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD = PVDD = CPVDD = HPVDD = HP_EN = VLDO_EN (MAX9789 only) = +5V, VGND = VPGND = VCPGND = SPKR_EN = VLDO_SET

(MAX9789 only) = 0V, ILDO_OUT (MAX9789 only) = 0, C1 = C2 = CBIAS = 1µF. RL= ∞, unless otherwise specified, VGAIN1 = 0,

VGAIN2 = 5V (AVSP = 10dB, AVHP = 3.5dB), TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage (VDD, PVDD, HPVDD,

CPVDD to GND)..................................................-0.3V to +6.0V

GND to PGND, CPGND ......................................................±0.3V

CPVSS, C1N, VSS to GND......................................-6.0V to +0.3V

HPR, HPL to GND ...............................................................±3.0V

Any Other Pin .............................................-0.3V to (VDD + 0.3V)

Duration of OUT_+, OUT_- Short Circuit

to GND or PVDD ......................................................Continuous

Duration of Short Circuit between OUT_+, OUT_-

and LDO_OUT.........................................................Continuous

Duration of Short Circuit between HPR, HPL and GND,

VSS or HPVDD..........................................................Continuous

Continuous Current (PVDD, OUT_+, OUT_-, PGND).............1.7A

Continuous Current (CPVDD, C1N, C1P, CPVSS, PVSS,

VDD, HPVDD, LDO_OUT, HPR, HPL) .............................850mA

Continuous Input Current (all other pins) .........................±20mA

Continuous Power Dissipation (TA= +70°C)

32-Pin Thin QFN Single-Layer Board

(derate 18.6mW/°C above +70°C)..............................1489mW

θJA...........................................................................53.7°C/W

θJC...........................................................................19.9°C/W

32-Pin Thin QFN Multilayer Board

(derate 24.9 mW/°C above +70°C).............................1990mW

θJA...........................................................................40.2°C/W

θJC...........................................................................19.9°C/W

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GENERAL

Supply Voltage VDD, PVDD Guaranteed by PSRR and LDO Line

Regulation Tests 4.5 5.5 V

Headphone Supply Voltage CPVDD,

HPVDD Guaranteed by PSRR Test 3.0 5.5 V

SPKR_EN HP_EN

1 (MAX9789) 0 (MAX9789) 0.1 0.4 mA

1 (MAX9790) 0 (MAX9790) 0.3 6 µA

11 713

0 0 14 29

Quiescent Current IDD

0 1 18 40

Shutdown Current ISHDN SPKR_EN = VDD, HP_EN = LDO_EN = GND 0.3 6 µA

Bias Voltage VBIAS 1.7 1.8 1.9 V

MAX9789A/MAX9789C/MAX9790A 100

Shutdown to Full Operation tSON MAX9789B/MAX9790B 25 ms

Gain Switching Time tSW 10 µs

Channel-to-Channel Gain

Tracking ±0.1 dB

SPEAKER AMPLIFIER

RL = 4Ω2

Output Power POUT THD+N = 1%, f = 1kHz,

TA = +25°C RL = 8Ω1W

RL = 8Ω, POUT = 1W, f = 1kHz 0.002

Total Harmonic Distortion Plus

Noise THD+N RL = 4Ω, POUT = 1W, f = 1kHz 0.004 %

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7 using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD = PVDD = CPVDD = HPVDD = HP_EN = VLDO_EN (MAX9789 only) = +5V, VGND = VPGND = VCPGND = SPKR_EN = VLDO_SET

(MAX9789 only) = 0V, ILDO_OUT (MAX9789 only) = 0, C1 = C2 = CBIAS = 1µF. RL= ∞, unless otherwise specified, VGAIN1 = 0,

VGAIN2 = 5V (AVSP = 10dB, AVHP = 3.5dB), TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VDD = 4.5V to 5.5V, TA = +25°C 72 90

f = 1kHz, 200mVP-P (Note 4) 70

Power-Supply Rejection Ratio PSRR

f = 10kHz, 200mVP-P (Note 4) 50

GAIN1 GAIN2

00 6

01 10

1 0 15.6

Voltage Gain AV

1 1 21.6

Measured at speaker amplifier inputs

GAIN1 GAIN2

00 80

01 65

10 45

Input Impedance RIN

11 25

kΩ

±1 ±15

Output Offset Voltage VOS

Measured between

OUT_+ and OUT_-,

TA = +25°C MAX9789C ±1 ±25

Into shutdown -50

Click-and-Pop Level KCP

RL = 8Ω, peak voltage,

A-weighted, 32 samples

per second (Notes 3, 4) Out of shutdown -50

dBV

A-weighted 102

Signal-to-Noise Ratio SNR RL = 8Ω, POUT = 1W f = 22Hz to 22kHz 99 dB

Noise VnBW = 22Hz to 22kHz 30 µVRMS

Capacitive-Load Drive CLNo sustained oscillations 200 pF

Crosstalk

L to R, R to L, RL = 8Ω, FS = 0.707VRMS,

VOUT = 70.7nVRMS, 20kHz AES17,

BW = 20Hz to 20kHz

-70 dB

Slew Rate SR 1.4 V/µs

HEADPHONE AMPLIFIER

RL = 16Ω100

Output Power POUT THD+N = 1%, f =

1kHz, TA = +25°C RL = 32Ω55 mW

RL = 32Ω, FS = 0.300VRMS,

VOUT = 210mVRMS, 20kHz AES17,

BW = 20Hz to 20kHz

-77 dB FS

RL = 32Ω, POUT = 40mW, f = 1kHz 0.02

RL = 16Ω, POUT = 60mW, f = 1kHz 0.03

Total Harmonic Distortion Plus

Noise THD+N

RL = 10kΩ, FS = 0.707VRMS,

VOUT = 500mVRMS, 20kHz AES17,

BW = 20Hz to 20kHz

-94 dB FS

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD = PVDD = CPVDD = HPVDD = HP_EN = VLDO_EN (MAX9789 only) = +5V, VGND = VPGND = VCPGND = SPKR_EN = VLDO_SET

(MAX9789 only) = 0V, ILDO_OUT (MAX9789 only) = 0, C1 = C2 = CBIAS = 1µF. RL= ∞, unless otherwise specified, VGAIN1 = 0,

VGAIN2 = 5V (AVSP = 10dB, AVHP = 3.5dB), TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

HPVDD = 3V to 5.5V, TA = +25°C 70 95

f = 1kHz, VRIPPLE = 200mVP-P (Note 4) 84

Power-Supply Rejection Ratio PSRR

f = 10kHz, VRIPPLE = 200mVP-P (Note 4) 63

Voltage Gain AV3.5 dB

Input Impedance RIN Measured at headphone amplifier inputs 20 40 80 kΩ

±2 ±7

Output Offset Voltage VOS TA = +25°C MAX9789C ±2 ±10 mV

Into shutdown -60

Click-and-Pop Level KCP

RL = 32Ω, peak voltage,

A-weighted, 32 samples

per second (Notes 3, 4) Out of shutdown -60

dBV

RL = 32Ω, f = 1kHz, A-weighted,

FS = 0.300VRMS, VOUT = 300µVRMS 89

Dynamic Range DR RL = 10kΩ, f = 1kHz, A-weighted,

FS = 0.707VRMS, VOUT = 707µVRMS 97

dB FS

22Hz to 22kHz 100

Signal-to-Noise Ratio SNR RL = 32Ω,

POUT = 60mW A-weighted 103 dB

Noise VnBW = 22Hz to 22kHz 12 µVRMS

Capacitive-Load Drive CLNo sustained oscillations 200 pF

RL = 32Ω,

FS = 0.300VRMS,

VOUT = 30mVRMS

-74

Crosstalk

L to R, R to L,

20kHz AES17

BW = 20Hz to 20kHz RL = 10kΩ,

FS = 0.707VRMS,

VOUT = 70.7mVRMS

-77

Slew Rate SR 0.4 V/µs

500 550 625

Charge-Pump Frequency fOSC MAX9789C 475 550 625 kHz

LOW-DROPOUT LINEAR REGULATOR

Regulator Input Voltage Range VDD Inferred from line regulation 4.5 5.5 V

IOUT = 0mA 0.1 0.4

Ground Current IGND IOUT = 120mA -40 mA

Output Current IOUT 120 mA

Crosstalk VOUT = 4.75V, IOUT = 0mA, f = 1kHz,

speaker POUT = 2W, speaker RL = 4Ω-95 dB

±1.5

Fixed Output Voltage Accuracy IOUT = 1mA MAX9789C ±3.0 %

Adjustable Output Voltage Range 1.21 4.75 V

1.18 1.21 1.23

LDO_SET Reference Voltage VSET MAX9789C 1.18 1.21 1.25 V

LDO_SET Dual-Mode Threshold 200 mV

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

_______________________________________________________________________________________ 5

Note 2: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.

Note 3: Specified at room temperature with an 8Ωresistive load connected across BTL output for speaker amplifier. Specified at

room temperature with a 32Ωresistive load connected between HPR, HPL, and GND for headphone amplifier. Speaker and

headphone mode transitions are controlled by SPKR_EN and HP_EN control pins, respectively.

Note 4: Amplifier inputs AC-coupled to GND.

Note 5: Maximum value is due to test limitations.

Note 6: VLDO_OUT = VLDO_OUTNOMINAL - 2%.

ELECTRICAL CHARACTERISTICS (continued)

(VDD = PVDD = CPVDD = HPVDD = HP_EN = VLDO_EN (MAX9789 only) = +5V, VGND = VPGND = VCPGND = SPKR_EN = VLDO_SET

(MAX9789 only) = 0V, ILDO_OUT (MAX9789 only) = 0, C1 = C2 = CBIAS = 1µF. RL= ∞, unless otherwise specified, VGAIN1 = 0,

VGAIN2 = 5V (AVSP = 10dB, AVHP = 3.5dB), TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LDO_SET Input Bias Current

(Note 5) ISET ±20 ±500 nA

IOUT = 50mA 25 50

Dropout Voltage (Note 6) VDO

VOUT = 4.75V (fixed

output operation),

TA = +25°C IOUT = 120mA 75 150

Current Limit ILIM 300 mA

Startup Time 20 µs

Line Regulation VIN = 4.5V to 5.5V, LDO_OUT = 2.5V,

ILDO_OUT = 1mA -4.8 +0.8 +4.8 mV/V

Load Regulation VLDO_OUT = 4.75V,

1mA < ILDO_OUT < 120mA 0.2 mV/mA

f = 1kHz 59

Ripple Rejection VRIPPLE = 200mVP-P

ILDO_OUT = 10mA f = 10kHz 42 dB

Output Voltage Noise 20Hz to 22kHz, CLDO_OUT = 2 x 1µF,

ILDO_OUT = 120mA 125 µVRMS

DIGITAL INPUTS (SPKR_EN, HP_EN, MUTE, GAIN1, GAIN2, LDO_EN (MAX9789 Only))

Input-Voltage High VINH 2V

Input-Voltage Low VINL 0.8 V

Input Bias Current ±1 µA

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, VGND = VPGND = VCPGND = VLDO_SET = 0V, C1 = C2 = CBIAS = CIN = 1µF. RL=

∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (AVSP = 10dB, AVHP = 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,

unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (HEADPHONE MODE)

MAX9789 toc01

FREQUENCY (Hz)

THD+N (dB FS)

10k1k100

-100

-90

-80

-70

-60

-110

10 100k

FS = 0.707VRMS

VOUT = -3dB FS

RL = 10kΩ

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (HEADPHONE MODE)

MAX9789 toc02

FREQUENCY (Hz)

THD+N (dB FS)

10k1k100

-90

-80

-70

-60

-100

10 100k

HPVDD = 3V

FS = 0.707VRMS

VOUT = -3dB FS

RL = 10kΩ

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT VOLTAGE (HEADPHONE MODE)

MAX9789 toc03

OUTPUT VOLTAGE (VRMS)

THD+N (%)

1.51.00.5

0.01

0.1

0.001

0 2.0

RL = 10kΩ

fIN = 20Hz

fIN = 10kHz

fIN = 1kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT VOLTAGE (HEADPHONE MODE)

MAX9789 toc04

OUTPUT VOLTAGE (VRMS)

THD+N (%)

1.51.00.5

0.01

0.1

0.001

0 2.0

HPVDD = 3V

RL = 10kΩ

fIN = 20Hz

fIN = 1kHz

fIN = 10kHz

CROSSTALK

vs. FREQUENCY (HEADPHONE MODE)

MAX9789 toc05

FREQUENCY (Hz)

CROSSTALK (dB)

10k1k100

-80

-90

-60

-40

-20

-70

-50

-30

-10

-100

10 100k

FS = 0.707VRMS

VOUT = -20dB FS

RL = 10kΩ

LEFT TO RIGHT

RIGHT TO LEFT

HEADPHONE OUTPUT SPECTRUM

MAX9789 toc06

FREQUENCY (Hz)

CROSSTALK (dB)

15k10k5k

-80

-90

-60

-40

-20

-70

-50

-30

-10

-140

-100

-110

-120

-130

0 20k

FS = 0.300VRMS

VOUT = -60dB FS

RL = 10kΩ

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (SPEAKER MODE)

MAX9789 toc07

FREQUENCY (Hz)

THD+N (dB FS)

1k100

-90

-95

-85

-80

-75

-100

10 100k10k

VOUT = -3dB FS

FS = 0.707VRMS

RL = 3Ω

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (SPEAKER MODE)

MAX9789 toc08

FREQUENCY (Hz)

THD+N (dB FS)

1k100

-90

-95

-85

-80

-75

-100

10 100k10k

VOUT = -3dB FS

FS = 0.707VRMS

RL = 4Ω

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (SPEAKER MODE)

MAX9789 toc09

FREQUENCY (Hz)

THD+N (dB FS)

1k100

-90

-100

-95

-105

-85

-80

-75

-110

10 100k10k

VOUT = -3dB FS

FS = 0.707VRMS

RL = 8Ω

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, VGND = VPGND = VCPGND = VLDO_SET = 0V, C1 = C2 = CBIAS = CIN = 1µF. RL=

∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (AVSP = 10dB, AVHP = 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,

unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (SPEAKER MODE)

MAX9789 toc10

OUTPUT POWER (W)

THD+N (%)

1.51.00.5

0.01

0.1

0.001

0 3.02.0 2.5

RL = 3Ω

fIN = 10kHz

fIN = 20Hz fIN = 1kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (SPEAKER MODE)

MAX9789 toc11

OUTPUT POWER (W)

THD+N (%)

1.51.00.5

0.01

0.1

0.001

0 2.52.0

RL = 4Ω

fIN = 10kHz

fIN = 20Hz fIN = 1kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (SPEAKER MODE)

MAX9789 toc12

OUTPUT POWER (W)

THD+N (%)

1.00.5

0.01

0.1

0.001

01.5

RL = 8Ω

fIN = 10kHz

fIN = 20Hz

fIN = 1kHz

CROSSTALK

vs. FREQUENCY (SPEAKER MODE)

MAX9789 toc13

FREQUENCY (Hz)

CROSSTALK (dB)

10k1k100

-80

-60

-40

-20

-100

-70

-50

-30

-10

-90

10 100k

FS = 0.707VRMS

VOUT = -20dB FS

RL = 8Ω

LEFT TO RIGHT

RIGHT TO LEFT

SPEAKER OUTPUT SPECTRUM

FREQUENCY (Hz)

CROSSTALK (dB)

MAX9789 toc14

0 5k 10k 15k 20k

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

FS = 0.707VRMS

VOUT = -60dB FS

RL = 8Ω

OUTPUT POWER vs. LOAD RESISTANCE

(SPEAKER MODE)

RL (Ω)

OUTPUT POWER (W)

MAX9789 toc15

0.5

1.0

1.5

2.0

2.5

3.0

3.5

1 10 100

fIN = 1kHz

THD+N = 1%

THD+N = 10%

POWER DISSIPATION PER CHANNEL

vs. OUTPUT POWER (SPEAKER MODE)

OUTPUT POWER PER CHANNEL (W)

POWER DISSIPATION PER CHANNEL (W)

MAX9789 toc16

0 0.5 1.0 1.5 2.0

0.25

0.50

0.75

1.00

1.25

1.50

RL = 8Ω

RL = 4Ω

fIN = 1kHz

POWER-SUPPLY REJECTION RATIO

(SPEAKER MODE)

FREQUENCY (Hz)

PSRR (dB)

MAX9789 toc17

10 100 1k 10k 100k

100

-90

-70

-80

-40

-50

-60

-30

-20

-10

VRIPPLE = 200mVP-P

OUTPUT REFERRED

SPEAKER SHUTDOWN WAVEFORM

MAX9789 toc20

20ms/div

2V/div

5V/div

100mV/div

OUT_+ AND OUT_-

OUT_+ - OUT_-

SPKR_EN

Typical Operating Characteristics (continued)

(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, VGND = VPGND = VCPGND = VLDO_SET = 0V, C1 = C2 = CBIAS = CIN = 1µF. RL=

∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (AVSP = 10dB, AVHP = 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,

unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

8 _______________________________________________________________________________________

SPEAKER STARTUP WAVEFORM

MAX9789 toc18

20ms/div

2V/div

OUT_+ AND OUT_-

OUT_+ - OUT_-

5V/div

SPKR_EN

100mV/div

MAX9789A/MAX9789C/MAX9790A

SPEAKER STARTUP WAVEFORM

MAX9789 toc19

20ms/div

OUT_+ AND OUT_-

2V/div

OUT_+ - OUT_-

100mV/div

SPKR_EN

5V/div

MAX9789B/MAX9790B

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (HEADPHONE MODE)

MAX9789 toc21

FREQUENCY (Hz)

THD+N (dB FS)

10k1k100

-105

-95

-85

-75

-65

-110

-100

-90

-80

-70

10 100k

FS = 0.300VRMS

RL = 32Ω

VOUT = -3dB FS

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (HEADPHONE MODE)

MAX9789 toc22

FREQUENCY (Hz)

THD+N (dB FS)

10k1k100

-105

-95

-85

-75

-65

-110

-100

-90

-80

-70

10 100k

HPVDD = 3V

FS = 0.300VRMS

RL = 32Ω

VOUT = -3dB FS

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (HEADPHONE MODE)

MAX9789 toc23

FREQUENCY (Hz)

THD+N (dB FS)

10k1k100

-105

-95

-85

-75

-65

-110

-100

-90

-80

-70

10 100k

FS = 0.300VRMS

RL = 16Ω

VOUT = -3dB FS

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (HEADPHONE MODE)

MAX9789 toc24

FREQUENCY (Hz)

THD+N (dB FS)

10k1k100

-105

-95

-85

-75

-65

-110

-100

-90

-80

-70

10 100k

HPVDD = 3V

FS = 0.300VRMS

RL = 16Ω

VOUT = -3dB FS

MAX9789/MAX9790

HEADPHONE OUTPUT SPECTRUM

MAX9789 toc30

FREQUENCY (kHz)

AMPLITUDE (dB)

15105

-80

-60

-40

-20

-140

-70

-50

-30

-10

-100

-120

-90

-110

-130

020

FS = 0.707VRMS

VOUT = -60dB FS

RL = 32Ω

OUTPUT POWER vs. LOAD RESISTANCE

(HEADPHONE MODE)

RL (Ω)

OUTPUT POWER (mW)

MAX9789 toc31

100

150

10 100 1000

THD+N = 1%

THD+N = 10%

fIN = 1kHz

OUTPUT POWER vs. LOAD RESISTANCE

(HEADPHONE MODE)

RL (Ω)

OUTPUT POWER (mW)

MAX9789 toc32

100

10 100 1000

HPVDD = 3V

fIN = 1kHz

THD+N = 1%

THD+N = 10%

Typical Operating Characteristics (continued)

(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, VGND = VPGND = VCPGND = VLDO_SET = 0V, C1 = C2 = CBIAS = CIN = 1µF. RL=

∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (AVSP = 10dB, AVHP = 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,

unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (HEADPHONE MODE)

MAX9789 toc26

OUTPUT POWER (mW)

THD+N (%)

604020

0.1

0.01

010080

RL = 32Ω

f = 1kHz

f = 10kHz

f = 20Hz

CROSSTALK

vs. FREQUENCY (HEADPHONE MODE)

MAX9789 toc29

FREQUENCY (Hz)

CROSSTALK (dB)

10k1k100

-80

-60

-40

-20

-110

-70

-50

-30

-10

-90

-100

10 100k

FS = 0.300VRMS

VOUT = -20dB FS

RL = 32Ω

LEFT TO RIGHT

RIGHT TO LEFT

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

_______________________________________________________________________________________

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (HEADPHONE MODE)

MAX9789 toc25

OUTPUT POWER (mW)

THD+N (%)

15010050

0.1

0.01

0200

RL = 16Ω

f = 20Hz

f = 10kHz

f = 1kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (HEADPHONE MODE)

MAX9789 toc27

OUTPUT POWER (mW)

THD+N (%)

10050

0.1

0.01

0150

HPVDD = 3V

RL = 16Ω

f = 1kHz

f = 10kHz

f = 20Hz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (HEADPHONE MODE)

MAX9789 toc28

OUTPUT POWER (mW)

THD+N (%)

604020

0.1

0.01

010080

HPVDD = 3V

RL = 32Ω

f = 20Hz

f = 10kHz

f = 1kHz

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

10 ______________________________________________________________________________________

POWER DISSIPATION vs. OUTPUT POWER

(HEADPHONE MODE)

OUTPUT POWER PER CHANNEL (mW)

POWER DISSIPATION PER CHANNEL (mW)

MAX9789 toc33

0 25 50 75 100 125

100

125

150

175

200

225

250

275

300

RL = 32Ω

RL = 16Ω

POWER DISSIPATION PER CHANNEL

vs. OUTPUT POWER (HEADPHONE MODE)

OUTPUT POWER PER CHANNEL (mW)

POWER DISSIPATION PER CHANNEL (mW)

MAX9789 toc34

0 20406080

100

125

RL = 32Ω

RL = 16Ω

HPVDD = 3V

HEADPHONE OUTPUT POWER vs. HPVDD

HPVDD (V)

HEADPHONE OUTPUT POWER (mW)

MAX9789 toc35

3.0 3.5 4.0 4.5 5.0

100

125

THD+N = 1%

fIN = 1kHz

RL = 32Ω

RL = 16Ω

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (HEADPHONE MODE)

FREQUENCY (Hz)

PSRR (dB)

MAX9789 toc36

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

10 100 1k 10k 100k

VRIPPLE = 200mVP-P

OUTPUT REFERRED

HEADPHONE STARTUP WAVEFORM

MAX9789 toc37

20ms/div

HP_

500mV/div

HP_EN

5V/div

MAX9789A/MAX9789C/MAX9790A

HEADPHONE STARTUP WAVEFORM

MAX9789 toc38

20ms/div

HP_EN

5V/div

HP_

500mV/div

MAX9789B/MAX9790B

Typical Operating Characteristics (continued)

(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, VGND = VPGND = VCPGND = VLDO_SET = 0V, C1 = C2 = CBIAS = CIN = 1µF. RL=

∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (AVSP = 10dB, AVHP = 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,

unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, VGND = VPGND = VCPGND = VLDO_SET = 0V, C1 = C2 = CBIAS = CIN = 1µF. RL=

∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (AVSP = 10dB, AVHP = 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,

unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)

HEADPHONE SHUTDOWN WAVEFORM

MAX9789 toc39

20ms/div

HP_

HP_EN

5V/div

500mV/div

SUPPLY CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

MAX9789 toc40

4.50 4.75 5.00 5.25 5.50

-5

SPKR_EN = 0

HP_EN = 0

SPKR_EN = 0

HP_EN = 1

SPKR_EN = 1

HP_EN = 0

SPKR_EN = 1

HP_EN = 1

SHUTDOWN CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

SHUTDOWN CURRENT (μA)

MAX9789 toc41

4.50 4.75 5.00 5.25 5.50

0.1

0.2

0.3

SPKR_EN = 5V

HP_EN = 0

LDO_EN = 0 (MAX9789)

LDO OUTPUT VOLTAGE ACCURACY

vs. ILOAD

ILOAD (mA)

LDO OUTPUT VOLTAGE ACCURACY (%)

MAX9789 toc42

0 25 50 75 100 125 150

-2.0

-1.5

-1.0

-0.5

0.5

1.0

1.5

2.0

VLDO_OUT = 4.75V

LDO OUTPUT VOLTAGE ACCURACY

vs. AMPLIFIER OUTPUT POWER

AMPLIFIER OUTPUT POWER (W)

LDO OUTPUT VOLTAGE ACCURACY (%)

MAX9789 toc43

0 0.5 1.0 1.5 2.0 2.5 3.0

-0.10

-0.05

0.05

0.10

VLDO_OUT = 4.75V

ILDO_OUT = 0A

LDO OUTPUT VOLTAGE ACCURACY

vs. TEMPERATURE

TEMPERATURE (°C)

LDO OUTPUT VOLTAGE ACCURACY (%)

MAX9789 toc44

-40 -15 10 35 60 85

-2.0

-1.5

-1.0

-0.5

0.5

1.0

1.5

2.0

ILDO_OUT = 1mA

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

12 ______________________________________________________________________________________

LINE-TRANSIENT RESPONSE

MAX9789 toc48

1ms/div

LDO_OUT

(AC-COUPLED)

20mV/div

VDD

1V/div

5.5V

4.5V

LDO LOAD-TRANSIENT RESPONSE

MAX9789 toc49

20ms/div

AC-COUPLED

VLDO_OUT

10mV/div

ILDO_OUT

15mA/div

LDO SHUTDOWN RESPONSE

MAX9789 toc50

200ms/div

VLDO_OUT

2V/div

LDO_EN

2V/div

ILOAD = 0mA

LDO CROSSTALK vs. FREQUENCY

FREQUENCY (Hz)

CROSSTALK (dB)

MAX9789 toc51

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

10 100 1k 10k 100k

VLDO_OUT = 4.75V

POUT = 2W

RL = 4Ω

IOUT = 0mA

LEFT SPEAKER TO LDO

RIGHT SPEAKER TO LDO

Typical Operating Characteristics (continued)

(VDD = PVDD = CPVDD = HPVDD = LDO_EN = +5V, VGND = VPGND = VCPGND = VLDO_SET = 0V, C1 = C2 = CBIAS = CIN = 1µF. RL=

∞, unless otherwise specified, GAIN1 = 0, GAIN2 = 1 (AVSP = 10dB, AVHP = 3.5dB), measurement BW = 20kHz AES17, TA= +25°C,

unless otherwise noted. Headphone mode: SPKR_EN = 1, HP_EN = 0. Speaker mode: SPKR_EN = 0, HP_EN = 1.)

DROPOUT VOLTAGE vs. ILOAD

MAX9789 toc45

ILOAD (mA)

DROPOUT VOLTAGE (mV)

125100755025

100

0150

VLDO_OUT = 4.75V

VLDO_OUT = 3.3V

RIPPLE REJECTION vs. FREQUENCY

MAX9789 toc46

FREQUENCY (Hz)

RIPPLE REJECTION (dB)

10k1k100

-80

-70

-60

-50

-40

-30

-20

-10

-90

10 100k

VLDO_OUT = 4.75V

VRIPPLE = 200mVP-P

IOUT = 10mA

OUTPUT REFERRED

VLDO_OUT = 3.3V

OUTPUT NOISE vs. FREQUENCY

MAX9789 toc47

FREQUENCY (Hz)

OUTPUT NOISE (μV√Hz)

10k1k100

0.1

0.01

10 100k

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________ 13

Pin Description

MAX9789 MAX9790

NAME FUNCTION

1 — LDO_SET Regulator Feedback Input. Connect to GND for 4.75V fixed output. Connect to a resistor-

divider for adjustable output. See Figure 1.

2 2 SPKR_INR Right-Channel Speaker Amplifier Input

3 3 SPKR_INL Left-Channel Speaker Amplifier Input

4 — LDO_EN LDO Enable. Connect LDO_EN to VDD to enable the LDO.

5, 21 5, 21 PGND Power Ground. Star-connect to GND.

6 6 OUTL+ Left-Channel Speaker Amplifier Output, Positive Phase

7 7 OUTL- Left-Channel Speaker Amplifier Output, Negative Phase

8, 18 8, 18 PVDD Speaker Amplifier Power-Supply Input. Bypass with a 0.1µF capacitor to PGND.

9 9 CPVDD Charge-Pump Power Supply. Connect a 1µF capacitor between CPVDD and PGND.

10 10 C1P Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor between C1P

to C1N.

11 11 CPGND Charge-Pump Ground. Connect directly to PGND plane.

12 12 C1N Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor between C1P

to C1N.

13 13 CPVSS Charge-Pump Output. Connect to PVSS.

14 14 PVSS Headphone Amplifier Negative Power Supply. Connect a 1µF capacitor between PVSS and

PGND.

15 15 HPR Right-Channel Headphone Amplifier Output

16 16 HPL Left-Channel Headphone Amplifier Output

17 17 HPVDD Headphone Amplifier Positive Power Supply. Connect a 10µF capacitor between HPVDD

and PGND.

19 19 OUTR- Right-Channel Speaker Amplifier Output, Negative Phase

20 20 OUTR+ Right-Channel Speaker Amplifier Output, Positive Phase

22 22 HP_EN Active-High Headphone Amplifier Enable

23 23 SPKR_EN Active-Low Speaker Amplifier Enable

24 24 BIAS Common-Mode Bias Voltage. Bypass with a 1µF capacitor to GND.

25 25 MUTE Active-Low Mute Enable. Mutes speaker and headphone amplifiers.

26 26 HP_INR Right-Channel Headphone Amplifier Input

27 27 HP_INL Left-Channel Headphone Amplifier Input

28 4, 28 GND Signal Ground. Star-connect to PGND.

29 — LDO_OUT LDO Output. Bypass with two 1µF capacitors to GND.

30 30 VDD

Positive Power Supply and LDO Input (MAX9789). Bypass with one 0.1µF capacitor and

two 1µF capacitors to GND (MAX9789). Bypass with one 0.1µF capacitor and one 1µF

capacitor to GND (MAX9790).

31 31 GAIN1 Speaker Amplifier Gain Select 1

32 32 GAIN2 Speaker Amplifier Gain Select 2

— 1, 29 N.C. No Connection. Not internally connected.

EP EP EP Exposed Paddle. Connect to GND.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

14 ______________________________________________________________________________________

Detailed Description

The MAX9789/MAX9790 combine a 2W BTL speaker

amplifier with an 100mW DirectDrive headphone amplifi-

er. These devices feature comprehensive click-and-pop

suppression and programmable four-level speaker ampli-

fier gain control. The MAX9789/MAX9790 feature high

+90dB PSRR, low 0.002% THD+N, industry-leading click-

and-pop performance, low-power shutdown mode, and

excellent RF immunity. The MAX9789 incorporates an

integrated LDO that serves as a clean power supply for a

CODEC or other circuits.

The MAX9789/MAX9790 is Microsoft Windows Vista com-

pliant. See Table 1 for a comparison of the Microsoft

Windows Vista premium mobile specifications and

MAX9789/MAX9790 specifications.

The speaker amplifiers use BTL architecture, doubling the

voltage drive to the speakers and eliminating the need for

DC-blocking capacitors. The output consists of two sig-

nals, identical in magnitude, but 180° out of phase.

The headphone amplifiers use Maxim’s DirectDrive

architecture to eliminate the bulky output DC-blocking

capacitors required by traditional headphone ampli-

fiers. A charge pump inverts a positive supply (CPVDD)

to create a negative supply (CPVSS). The headphone

amplifiers operate from these bipolar supplies with their

outputs biased about GND. The benefit of the GND

bias is that the amplifier outputs no longer have a DC

component (typically VDD / 2). This feature eliminates

the large DC-blocking capacitors required with conven-

tional headphone amplifiers to conserve board space

and system cost, as well as improve low-frequency

response.

The MAX9789/MAX9790 feature programmable speak-

er amplifier gain, allowing the speaker gain to be set by

the logic voltages applied to GAIN1 and GAIN2, while

the headphone amplifiers feature a fixed 3.5dB gain.

Both amplifiers feature an undervoltage lockout that

prevents operation from an insufficient power supply

and click-and-pop suppression that eliminates audible

transients on startup and shutdown. The amplifiers

include thermal overload and short-circuit protection.

An additional feature of the speaker amplifiers is that

there is no phase inversion from input to output.

Low-Dropout Linear Regulator

(MAX9789 Only)

The MAX9789’s low-dropout (LDO) linear regulator can

be used to provide a clean power supply to a CODEC

or other circuitry. The LDO can be enabled indepen-

dently of the audio amplifiers. Set LDO_EN = VDD to

enable the LDO or set LDO_EN = GND to disable the

LDO. The LDO is capable of providing up to 120mA

continuous current and features Maxim’s Dual Mode™

feedback, easily enabling a fixed 4.75V output or a

user-adjustable output. When LDO_SET is connected

to GND, the output is internally set to 4.75V. The output

voltage can be adjusted from 1.21V to 4.75V by con-

necting two external resistors as a voltage divider, at

LDO_SET (Figure 1).

Note: THD+N, DYNAMIC RANGE, and CROSSTALK should be measured in accordance with AES-17 audio measurements standards.

Table 1. Windows Premium Mobile Vista Specifications vs. MAX9789/MAX9790

Specifications

DEVICE TYPE REQUIREMENT WINDOWS PREMIUM MOBILE Vista

SPECIFICATIONS

MAX9789/MAX9790

TYPICAL PERFORMANCE

THD+N ≤ -65dB FS

[20Hz, 20kHz]

-94dB FS

[20Hz, 20kHz]

Dynamic range with

signal present

≤ -80dB FS,

A-weighted

-97dB FS,

A-weighted

Analog Line Output

Jack (RL = 10kΩ,

FS = 0.707VRMS)

Line output crosstalk

≤ -50dB

[20Hz, 20kHz]

-77dB

[20Hz, 20kHz]

THD+N ≤ -45dB FS

[20Hz, 20kHz]

-77dB FS

[20Hz, 20kHz]

Dynamic range with

signal present

≤ -60dB FS,

A-weighted

-89dB FS,

A-weighted

Analog Headphone

Out Jack (RL = 32Ω,

FS = 0.300VRMS)Headphone output

crosstalk

≤ -50dB

[20Hz, 20kHz]

-74dB

[20Hz, 20kHz]

Dual Mode is a trademark of Maxim Integrated Products, Inc.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________ 15

The output voltage is set by the following equation:

where VLDO_SET = 1.21V.

To simplify resistor selection:

Since the input bias current at LDO_SET is typically

less than 500nA (max), large resistance values can be

used for R1 and R2 to minimize power consumption

without compromising accuracy. The parallel combina-

tion of R1 and R2 should be less than 1MΩ.

DirectDrive

Conventional single-supply headphone amplifiers have

their outputs biased about a nominal DC voltage

(VDD / 2) for maximum dynamic range. Large coupling

capacitors are needed to block this DC bias from the

headphones. Without these capacitors, a significant

amount of DC current flows to the headphone, resulting

in unnecessary power dissipation and possible dam-

age to both headphone and headphone amplifier.

Maxim’s DirectDrive architecture uses a charge pump

to create an internal negative supply voltage. It allows

the MAX9789/MAX9790 headphone amplifier output to

be biased about GND. With no DC component, there is

no need for the large DC-blocking capacitors. Instead

of two large capacitors (330µF typically required to

meet Vista magnitude response specifications), the

MAX9789/MAX9790 charge pump requires only two

small 1µF ceramic capacitors, conserving board

space, reducing cost, and improving the low-frequency

response of the headphone amplifier.

Previous attempts to eliminate the output coupling

capacitors involved biasing the headphone return

(sleeve) to the DC bias voltage of the headphone

amplifiers. This method raised some issues:

• The sleeve is typically grounded to the chassis.

Using this biasing approach, the sleeve must be iso-

lated from system ground, complicating product

design.

• During an ESD strike, the amplifier’s ESD structures

are the only path to system ground. The amplifier

must be able to withstand the full ESD strike.

• When using the headphone jack as a line out to

other equipment, the bias voltage on the sleeve may

conflict with the ground potential from other equip-

ment, resulting in large ground loop current and

possible damage to the amplifiers.

Low-Frequency Response

In addition to the cost and size disadvantages, the DC-

blocking capacitors limit the low-frequency response of

the amplifier and distort the audio signal:

• The impedance of the headphone load and the DC-

blocking capacitor form a highpass filter with the

-3dB point determined by:

where RLis the impedance of the headphone and

COUT is the value of the DC-blocking capacitor.

• The highpass filter is required by conventional single-

ended, single-supply headphone amplifier to block

the midrail DC component of the audio signal from the

headphones. Depending on the -3dB point, the filter

can attenuate low-frequency signals within the audio

band. Larger values of COUT reduce the attenuation,

but are physically larger, more expensive capacitors.

Figure 2 shows the relationship between the size of

COUT and the resulting low-frequency attenuation.

Note the Vista’s magnitude response specification

calls for a -3dB point at 20Hz at the headphone jack.

The -3dB point at 20Hz for a 32Ωheadphone requires

a 330µF blocking capacitor (Table 2).

fRC

dB L OUT

−=

2π

RRVLDO OUT

12 121 1=⎛

⎝

⎜⎞

⎠

⎟

−

VV R

LDO OUT LDO SET__

⎛

⎝

⎜⎞

⎠

⎟

MAX9789

LDO_OUT

LDO_SET

GND

1μF

TO HDA

CODEC

Figure 1. Adjustable Output Using External Feedback

Resistors.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

16 ______________________________________________________________________________________

• The voltage coefficient of the capacitor, the change

in capacitance due to a change in the voltage

across the capacitor, distorts the audio signal. At

frequencies around the -3dB point, this effect is

maximized and the voltage coefficient appears as

frequency-dependent distortion. Figure 3 shows the

THD+N introduced by two different capacitor

dielectrics. Note that around the -3dB point, THD+N

increases dramatically.

• The combination of low-frequency attenuation and fre-

quency-dependent distortion compromises audio

reproduction. DirectDrive improves low-frequency

reproduction in portable audio equipment that empha-

sizes low-frequency effects, such as multimedia lap-

tops, MP3, CD, and DVD players (See Table 2).

Charge Pump

The MAX9789/MAX9790 feature a low-noise charge

pump. The 550kHz switching frequency is well beyond

the audio range, and does not interfere with the audio

signals. The switch drivers feature a controlled switching

speed that minimizes noise generated by switching

transients. Limiting the switching speed of the charge

pump minimizes the di/dt noise caused by the parasitic

bond wire and trace inductance.

BIAS

The MAX9789/MAX9790 feature an internally generat-

ed, power-supply independent, common-mode bias

voltage of 1.8V referenced to GND. BIAS provides both

click-and-pop suppression and sets the DC bias level

for the amplifiers. The BIAS pin should be bypassed to

GND with a 1µF capacitor. No external load should be

applied to BIAS. Any load lowers the BIAS voltage,

affecting the overall performance of the device.

Headphone and Speaker Amplifier Gain

The MAX9789/MAX9790 feature programmable speak-

er amplifier gain, set by the logic voltages applied to

pins GAIN1 and GAIN2. Table 3 shows the logic com-

binations that can be applied to pins GAIN1 and GAIN2

and their affects on the speaker amplifier gain. The

headphone amplifier gain is fixed at 3.5dB.

-30

1 10 100 1k 10k 100k

LOW-FREQUENCY ROLLOFF

(RL = 16Ω)

-24

-27

-12

-15

-18

-21

-6

-9

-3

FREQUENCY (Hz)

ATTENUATION (dB)

DirectDrive

330μF

220μF

100μF

33μF

Figure 2. Low-Frequency Attenuation of Common DC-Blocking

Capacitor Values

ADDITIONAL THD+N DUE TO

DC-BLOCKING CAPACITORS

FREQUENCY (Hz)

THD+N (%)

10k1k100

0.001

0.01

0.1

0.0001

10 100k

TANTALUM

COUT = 100μF

RL = 16Ω

ALUM/ELEC

Figure 3. Distortion Contributed by DC-Blocking Capacitors

MAX9789/MAX9790

GAIN1 GAIN2 SPEAKER MODE

GAIN (dB)

HEADPHONE

MODE GAIN (dB)

0 0 6 3.5

0 1 10 3.5

1 0 15.6 3.5

1 1 21.6 3.5

Table 3. MAX9789/MAX9790

Programmable Gain Settings

f-3dB (Hz)

COUT (µF)

RL = 16ΩRL = 32Ω

22 452 226

33 301 151

100 99 50

220 45 23

330* 30 15

470 21 11

Table 2. Low-Frequency Rolloff

*Vista requirement for 32

load.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________ 17

Speaker and Headphone

Amplifier Enable

The MAX9789/MAX9790 feature control inputs for the

independent enabling of the speaker and headphone

amplifiers, allowing both to be active simultaneously if

required. Driving SPKR_EN high disables the speaker

amplifiers. Driving HP_EN low independently disables

the headphone amplifiers. For applications that require

only one of the amplifiers to be on at a given time,

SPKR_EN and HP_EN can be tied together allowing a

single logic voltage to enable either the speaker or the

headphone amplifier as shown in Figure 4.

MUTE

The MAX9789/MAX9790 allow for the speaker and

headphone amplifiers to be muted. By driving MUTE

low, both the speaker and headphone amplifiers are

muted. When muted, the speaker outputs remain

biased at VDD / 2.

Shutdown

The MAX9789/MAX9790 feature a low-power shutdown

mode, drawing 0.3µA of supply current. By disabling the

speaker, headphone amplifiers and the LDO (for

MAX9789), the MAX9789/MAX9790 enter low-power

shutdown mode. Set SPKR_EN to VDD and HP_EN and

LDO_EN to GND to disable the speaker amplifiers, head-

phone amplifiers, and LDO, respectively.

Click-and-Pop Suppression

Speaker Amplifier

The MAX9789/MAX9790 speaker amplifiers feature

Maxim’s comprehensive, industry-leading click-and-

pop suppression. During startup, the click-and-pop

suppression circuitry eliminates any audible transient

sources internal to the device. When entering shut-

down, the differential speaker outputs ramp to GND

quickly and simultaneously.

Headphone Amplifier

In conventional single-supply headphone amplifiers, the

output-coupling capacitor is a major contributor of audi-

ble clicks and pops. Upon startup, the amplifier charges

the coupling capacitor to its bias voltage, typically

VDD / 2. Likewise, during shutdown, the capacitor is dis-

charged to GND. A DC shift across the capacitor results,

which in turn, appears as an audible transient at the

headphone. Since the MAX9789/MAX9790 do not require

output-coupling capacitors, no audible transient occurs.

Additionally, the MAX9789/MAX9790 features extensive

click-and-pop suppression that eliminates any audible

transient sources internal to the device. The

startup/shutdown waveform in the

Typical Operating

Characteristics

shows that there are minimal spectral

components in the audible range at the output.

Applications Information

BTL Speaker Amplifiers

The MAX9789/MAX9790 feature speaker amplifiers

designed to drive a load differentially, a configuration

referred to as bridge-tied load (BTL). The BTL configu-

ration (Figure 5) offers advantages over the single-

ended configuration, where one side of the load is

connected to ground. Driving the load differentially

doubles the output voltage compared to a single-

ended amplifier operating under similar conditions. The

doubling of the output voltage yields four times the out-

put power at the load.

Since the differential outputs are biased at mid-supply,

there is no net DC voltage across the load. This elimi-

nates the need for DC-blocking capacitors required for

single-ended amplifiers. These capacitors can be

large, expensive, consume board space, and degrade

low-frequency performance.

MAX9789/MAX9790

SPKR_EN

SINGLE

CONTROL PIN

HP_EN

Figure 4. Enabling Either the Speaker or Headphone Amplifier

with a Single Control Pin

+1 VOUT(P-P)

2 x VOUT(P-P)

VOUT(P-P)

-1

Figure 5. Bridge-Tied Load Configuration

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

18 ______________________________________________________________________________________

Mono Speaker Configuration

The MAX9789 stereo BTL Class AB speaker amplifier

can be configured to drive a mono speaker. Rather

than combining the CODEC’s left- and right-input sig-

nals in a resistive network prior to one channel of the

speaker amplifier input, the transducer itself can be

connected to the BTL speaker amplifier output as

shown in Figure 6. When compared to the resistive net-

work implementation, the configuration in Figure 6 will:

1) Eliminate noise pickup by eliminating the high-

impedance node at the CODEC’s left- and right-

signal mixing point. SNR performance will be

improved as a result.

2) Eliminate gain error by eliminating any resistive

mismatch between the external resistance used to

sum the left and right signals and the MAX9789

internal resistance.

Power Dissipation and Heat Sinking

Under normal operating conditions, the MAX9789/

MAX9790 can dissipate a significant amount of power.

The maximum power dissipation for each package is

given in the

Absolute Maximum Ratings

section under

Continuous Power Dissipation, or can be calculated by

the following equation:

where TJ(MAX) is +150°C, TAis the ambient tempera-

ture, and θJA is the reciprocal of the derating factor in

°C/W as specified in the

Absolute Maximum Ratings

section. For example, θJA for the 32-pin TQFN-EP pack-

age is +40.2°C/W for a multilayer PC board.

Output Power (Speaker Amplifier)

The increase in power delivered by the BTL configura-

tion directly results in an increase in internal power dis-

sipation over the single-ended configuration. The

maximum power dissipation for a given VDD and load is

given by the following equation:

If the power dissipation for a given application exceeds

the maximum allowed for a given package, either reduce

VDD, increase load impedance, decrease the ambient

temperature, or add heat sinking to the device. Large

output, supply, and ground PC board traces improve the

maximum power dissipation in the package.

Thermal-overload protection limits total power dissipa-

tion in these devices. When the junction temperature

exceeds +150°C, the thermal-protection circuitry dis-

ables the amplifier output stage. The amplifiers are

enabled once the junction temperature cools by +15°C.

This results in a pulsing output under continuous ther-

mal-overload conditions as the device heats and cools.

Power Supplies

The MAX9789/MAX9790 have separate supply pins for

each portion of the device, allowing for the optimum

combination of headroom and power dissipation and

noise immunity. The speaker amplifiers are powered

from PVDD. PVDD ranges from 4.5V to 5.5V. The head-

phone amplifiers are powered from HPVDD and PVSS.

HPVDD is the positive supply of the headphone ampli-

fiers and ranges from 3V to 5.5V. PVSS is the negative

supply of the headphone amplifiers. Connect PVSS to

CPVSS. The charge pump is powered by CPVDD.

CPVDD ranges from 3V to 5.5V and should be the same

potential as HPVDD. The charge pump inverts the volt-

age at CPVDD, and the resulting voltage appears at

CPVSS. The internal LDO and the remainder of the

device is powered by VDD.

Component Selection

Supply Bypassing

The MAX9789/MAX9790 have separate supply pins for

each portion of the device, allowing for the optimum

combination of headroom and power dissipation and

noise immunity.

Speaker Amplifier Power-Supply Input (PV

)

The speaker amplifiers are powered from PVDD. PVDD

ranges from 4.5V to 5.5V. Bypass PVDD with a 0.1µF

capacitor to PGND. Note additional bulk capacitance is

required at the device if long input traces between

PVDD and the power source are used.

DISS MAX DD

()

=22

PTT

DISSPKG MAX J MAX A

() ()

=−

SPKR_OUTL

SPKR_OUTR

SPKR_INL

SPKR_INR

OUTL+

OUTL-

OUTR+

OUTR-

CODEC CIN1

LINE_OUTR

LINE_OUTL

HP_INL

HP_INR

HPL

HPR

MAX9789

CIN1

CIN2

Figure 6. Mono Signal Output Configuration for MAX9789

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________ 19

Headphone Amplifier Power-Supply

Input (HPVDD and PVSS)

The headphone amplifiers are powered from HPVDD

and PVSS. HPVDD is the positive supply of the head-

phone amplifiers and ranges from 3.0V to 5.5V. Bypass

HPVDD with a 10µF capacitor to PGND. PVSS is the

negative supply of the headphone amplifiers. Bypass

PVSS with a 1µF capacitor to PGND. Connect PVSS to

CPVSS. The charge pump is powered by CPVDD.

CPVDD ranges from 3.0V to 5.5V and should be the

same potential as HPVDD. Bypass CPVDD with a 1µF

capacitor to PGND. The charge pump inverts the volt-

age at CPVDD, and the resulting voltage appears at

CPVSS. A 1µF capacitor must be connected between

C1N and C1P.

Power Supply and LDO Input (V

)

The internal LDO and the remainder of the device is

Bypass VDD with a 0.1µF capacitor to GND and two

1µF capacitors in parallel to GND. Note additional bulk

capacitance is required at the device if long input

traces between VDD and the power source are used.

Input Filtering

The input capacitor (CIN), in conjunction with the ampli-

fier input resistance (RIN), forms a highpass filter that

removes the DC bias from the incoming signal. The AC-

coupling capacitor allows the amplifier to bias the sig-

nal to an optimum DC level. Assuming zero source

impedance, the -3dB point of the highpass filter is

given by:

RIN is the amplifier’s internal input resistance value

given in the

Electrical Characteristics

. Choose CIN such

that f-3dB is well below the lowest frequency of interest.

Setting f-3dB too high affects the amplifier’s low fre-

quency response. Use capacitors with adequately low

voltage coefficient dielectrics, such as 1206-sized X7R

ceramic capacitors. Capacitors with higher voltage

coefficients result in increased distortion at low fre-

quencies (see Figure 7).

BIAS Capacitor

BIAS is the output of the internally generated DC bias

voltage. The BIAS bypass capacitor, CBIAS improves

PSRR and THD+N by reducing power supply and other

noise sources at the common-mode bias node, and

also generates the clickless/popless, startup/shutdown

DC bias waveforms for the speaker and headphone

amplifiers. Bypass BIAS with a 1µF capacitor to GND.

Charge-Pump Capacitor Selection

Use capacitors with an ESR less than 100mΩfor opti-

mum performance. Low ESR ceramic capacitors mini-

mize the output resistance of the charge pump. For

best performance over the extended temperature

range, select capacitors with an X7R dielectric.

Flying Capacitor (C1)

The value of the flying capacitor (C1) affects the load

regulation and output resistance of the charge pump. A

C1 value that is too small degrades the device’s ability

to provide sufficient current drive, which leads to a loss

of output voltage. Connect a 1µF capacitor between

C1P and C1N.

fRC

dB IN IN

−=

2π

INPUT COUPLING CAPACITOR-INDUCED THD+N

vs. FREQUENCY (HEADPHONE MODE)

FREQUENCY (Hz)

THD+N (dB FS)

100

-85

-80

-75

-70

-65

-60

-55

-50

-90

10 1000

0402 6.3V X5R 10% 1μF

0603 10V X5R 10% 1μF

0805 25V X7R 10% 1μF

1206 25 X7R 10% 1μFVOUT = -3dB FS

FS = 1VRMS

RL = 32Ω

Figure 7. Input Coupling Capacitor-Induced THD+N vs.

Frequency (Headphone Mode)

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

20 ______________________________________________________________________________________

Output Capacitor (C2)

The output capacitor value and ESR directly affect the

ripple at CPVSS. Increasing the value of C2 reduces

output ripple. Likewise, decreasing the ESR of C2

reduces both ripple and output resistance. Lower

capacitance values can be used in systems with low

maximum output power levels.

CPV

Bypass Capacitor (C3)

The CPVDD bypass capacitor (C3) lowers the output

impedance of the power supply and reduces the

impact of the MAX9789/MAX9790’s charge-pump

switching transients. Bypass CPVDD with 1µF, the same

value as C1, and place it physically close to the CPVDD

and CPGND pins.

Layout and Grounding

Proper layout and grounding are essential for optimum

performance. Use large traces for the power-supply

inputs and amplifier outputs to minimize losses due to

parasitic trace resistance, as well as route heat away

from the device. Good grounding improves audio per-

formance, minimizes crosstalk between channels, and

prevents switching noise from coupling into the audio

signal. Connect PGND and GND together at a single

point on the PC board. Route PGND and all traces that

carry switching transients away from GND and the

traces and components in the audio signal path.

Connect C2 and C3 to the PGND plane. Connect PVSS

and CPVSS together at C2. Place the charge-pump

capacitors (C1, C2, and C3) as close as possible to

the device. Bypass PVDD with a 0.1µF capacitor to

PGND. Place the bypass capacitors as close as possi-

ble to the device.

Use large, low-resistance output traces. As load imped-

ance decreases, the current drawn from the device out-

puts increase. At higher current, the resistance of the

output traces decrease the power delivered to the load.

For example, if 2W is delivered from the speaker output

to a 4Ωload through a 100mΩtrace, 49mW is con-

sumed in the trace. If power is delivered through a

10mΩtrace, only 5mW is consumed in the trace. Large

output, supply and GND traces also improve the power

dissipation of the device.

The MAX9789/MAX9790 thin QFN package features an

exposed thermal pad on its underside. This pad lowers

the package’s thermal resistance by providing a direct

heat conduction path from the die to the printed circuit

board. Connect the exposed thermal pad to GND by

using a large pad and multiple vias to the GND plane.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________ 21

Block Diagrams

MAX9789

HP_EN 22

HP_INL 27

HP_INR 26

LDO_EN 4

VDD

LDO_SET 1

LDO_OUT 29

MUTE 25

SPKR_EN 23

GAIN2 32

GAIN1 31

STEREO

BTL

AMPLIFIER

CONTROL

CHARGE

PUMP

LDO BLOCK

TO HPVDD

TO PVSS

0.1µF

1.0µF

0.1µF

1.0µF

PVDD

8, 18

4.5V TO 5.5V

6 OUTL+

OUTL-

OUTR+

OUTR-

BIAS

HPL

HPR

HPVDD

CPVDD

C1P

C1N

CPGND

1314

PVSS

1.0µF

CPVSS

5, 21

PGNDGND

SPKR_INL

SPKR_INR 2

1.0µF

1.0µF1.0µF

4.5V TO 5.5V

3V TO 5.5V

TO CODEC

LOGIC PINS CONFIGURED FOR:

LDO_EN = 1, LDO ENABLED

SPKR_EN = 0, SPEAKER AMPLIFIERS ENABLED

HP_EN = 1, HEADPHONE AMPLIFIER ENABLED

MUTE = 1, MUTE DISABLED

GAIN1 = 0 GAIN = 0, 6dB SPEAKER GAIN

1µF

10µF

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

22 ______________________________________________________________________________________

Block Diagrams (continued)

MAX9790

HP_EN 22

HP_INL 27

HP_INR 26

MUTE 25

SPKR_EN 23

GAIN2 32

GAIN1 31

STEREO

BTL

AMPLIFIER

CONTROL

CHARGE

PUMP

TO HPVDD

TO PVSS

0.1μF

1.0μF

VDD PVDD

30 8, 18

4.5V TO 5.5V

6 OUTL+

OUTL-

OUTR+

OUTR-

BIAS

HPL

HPR

HPVDD

CPVDD

C1P

C1N

CPGND

1314

PVSS

1.0μF

CPVSS

5, 21

PGNDGND

4, 28

SPKR_INL

SPKR_INR 2

1.0μF

3V TO 5.5V

1μF

10μF

LOGIC PINS CONFIGURED FOR:

SPKR_EN = 0, SPEAKER AMPLIFIERS ENABLED

HP_EN = 1, HEADPHONE AMPLIFIER ENABLED

MUTE = 1, MUTE DISABLED

GAIN1 = 0 GAIN = 0, 6dB SPEAKER GAIN

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________ 23

System Diagrams

MAX9789

MAX9713

10μF

0.1μF

CIN

1μF

VDD

BIAS PVDD

OUTL+

OUTL-

OUT+

OUT-

C1P

C1N

CHOLD

OUTR+

OUTR-

HPL

HPR

LDO_SET

GND PGND

SPKR_INL

CIN

1μFSPKR_INR

CIN

1μFHP_INR

CIN

1μFHP_INL

SPKR_L

SPKR_R

HP_R

HP_L

MONO

DGND AGND CPVDD

C1P

C1N

SPKR_EN

HP_EN

LDO_EN

GAIN1

GAIN2

MUTE

FS2

FS1

SHDN

IN+

5.0V

VLDO_OUT

5.0V

4.75V

12V

HPVDD

5.0V

PGND AGND

1μF 1μFCBULK

1μF

HDA

CODEC

μC

1μFC1

1μF

VDD

LDO_OUT

CPVSS

1μF

4Ω

8Ω

1μF

PVSS

CPGND

VDD

100μF1μF

0.47μF

IN-

0.47μF

0.47μFREG

0.01μF

1μF

0.1μF

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

24 ______________________________________________________________________________________

System Diagrams (continued)

MAX9789

MAX4411

10μF

1μF

VDD PVDD

OUTL+

OUTL-

C1P

C1N

PVSS

SVSS

OUTR+

OUTR-

HPL

HPR

GND PGND

SPKR_INL

1μF

SPKR_INR

1μF

HP_INR

1μF

HP_INL

SPKR_L

SPKR_R

HP1_R

HP1_L

HP2_R

HP2_L

AGNDDGND

CPVDD

C1P

C1N

SPKR_EN

LDO_EN

GAIN2

GAIN1

MUTE

SHDNR

INR

+5V

VLDO_OUT

+3.3V

HPVDD

+3.3V

SGND PGND

1μF 0.1μF

1μF 1μF

HDA

CODEC

μC

1μFC1

1μF

HP_EN

CPVSS

LDO_OUT

LDO_SET

PVSS

CPGND

4.75V

1μF

SHDNL

INL

PVDD

1μF

+3.3V

SVDD

1μF

OUTL HP2

HP1

OUTR

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________ 25

Simplified Block Diagrams

(continued)

Chip Information

PROCESS: BiCMOS

Pin Configurations

MAX9789

TQFN

TOP VIEW

SPKR_INR

LDO_EN

PGND

OUTL+

OUTL-

LDO_SET

SPKR_EN

PGND

OUTR+

BIAS

OUTR-

PVDD

GND

4567

2324 22 20 19 18

LDO_OUT

VDD

PVSS

CPVSS

C1N

CPGND

SPKR_INL HP_EN

31 10

GAIN1 C1P

*EP = EXPOSED PADDLE

EP*

GAIN2 CPVDD

HP_INL

26 15 HPR

HP_INR

25 16 HPL

PVDD HPVDD

MUTE

MAX9790

SPKR_INR

GND

PGND

OUTL+

OUTL-

N.C.

SPKR_EN

PGND

OUTR+

BIAS

OUTR-

PVDD

GND

4567

2324 22 20 19 18

N.C.

VDD

PVSS

CPVSS

C1N

CPGND

SPKR_INL HP_EN

31 10

GAIN1 C1P

32 9

GAIN2 CPVDD

HP_INL

26 15 HPR

HP_INR

25 16 HPL

PVDD HPVDD

MUTE

TQFN

*EP = EXPOSED PADDLE

EP*

MAX9790

SPKR_EN

HP_EN

MUTE

GAIN1

GAIN2

SPEAKER SUPPLY

4.5V TO 5.5V

SPKR_INR

SPKR_INL

HP_INR

HP_INL

HEADPHONE SUPPLY

3.0V TO 5.5V

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

26 ______________________________________________________________________________________

QFN THIN.EPS

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

32 TQFN-EP T3255N-1 21-0140

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the

package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the

package regardless of RoHS status.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

______________________________________________________________________________________ 27

Package Information (continued)

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the

package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the

package regardless of RoHS status.

MAX9789/MAX9790

Windows Vista-Compliant, Stereo Class AB Speaker

Amplifiers and DirectDrive Headphone Amplifiers

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Revision History

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

2 8/08 Added MAX9789C to data sheet and made miscellaneous clarifications 1–11, 13, 14, 18

3 9/09 Corrected the Block Diagrams 21

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Authorized Distributor

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