General Description
The MAX9710/MAX9711 are stereo/mono 3W bridge-tied
load (BTL) audio power amplifiers. These devices are
PC99/01 compliant, operate from a single 4.5V to 5.5V
supply, and feature an industry-leading 100dB PSRR,
which allows these devices to operate from noisy sup-
plies without additional, costly power-supply condition-
ing. An ultra-low 0.005% THD+N ensures clean,
low-distortion amplification of the audio signal while
click-and-pop suppression eliminates audible transients
on power and shutdown cycles. Power-saving features
include low 2mV VOS (minimizing DC current drain
through the speakers), low 7mA supply current, and a
0.5µA shutdown mode. A MUTE function allows the out-
puts to be quickly enabled or disabled.
These devices include thermal overload protection, are
specified over the extended -40°C to +85°C tempera-
ture range, and are supplied in thermally efficient pack-
ages. The MAX9710 is available in a 20-pin thin QFN
package (5mm ✕5mm ✕0.8mm). The MAX9711 is
available in a 12-pin thin QFN package (4mm ✕4mm ✕
0.8mm).
Applications
Features
♦3W into 3Ω(1% THD+N)
♦4W into 3Ω(10% THD+N)
♦Industry-Leading, Ultra-High 100dB PSRR
♦PC99/01 Compliant
♦Click-and-Pop Suppression
♦Low 0.005% THD+N
♦Low Quiescent Current: 7mA
♦Low-Power Shutdown Mode: 0.5µA
♦MUTE Function
♦Tiny 20-Pin Thin QFN (5mm ✕5mm ✕0.8mm)
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-2841; Rev 1; 6/08
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN-PACKAGE
AMP
MAX9710ETP
-40°C to +85°C 20-Thin QFN-EP*
Stereo
MAX9711ETC
-40°C to +85°C 12-Thin QFN-EP*
Mono
MAX9710
TQFN
1INL
2BIAS
3N.C.
4MUTE
5INR
6
PGND
7
OUTR+
8
PVDD
9
OUTR-
10
N.C.
11 PGND
12 VDD
13 N.C.
14
15 PGND
16
N.C.
17
OUTL-
18
PVDD
19
OUTL+
20
PGND
SHDN
TOP VIEW
SINGLE SUPPLY
4.5V TO 5.5V
MAX9710
LEFT IN
RIGHT IN
Pin Configurations Simplified Block Diagram
*
EP = Exposed pad.
Notebook PCs
Flat-Panel TVs
Flat-Panel PC Displays
Two-Way Radios
General-Purpose Audio
Powered Speakers
Pin Configurations continued at end of data sheet.
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.
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD = PVDD = 5.0V, VGND = VPGND = VMUTE = 0V, VSHDN = 5V, RIN = RF= 15kΩ, RL= ∞. TA= TMIN to TMAX, unless otherwise
noted. Typical values are at TA= +25°C.) (Note 1)
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.
Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 2: PSSR is specified with the amplifier inputs connected to GND through RIN and CIN.
VDD to GND, PGND ...............................................................+6V
PVDD to VDD .......................................................................±0.3V
PGND to GND.....................................................................±0.3V
All Other Pins to GND.................................-0.3V to (VDD + 0.3V)
Continuous Input Current (into any pin
except power supply and output pins).........................±20mA
Continuous Power Dissipation (TA= +70°C)
12-Pin Thin QFN (derate 16.9mW/°C above +70°C) ....1349mW
20-Pin Thin QFN (derate 20.8mW/°C above +70°C) ....1667mW
Operating Temperature Range............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VDD/PVDD Inferred from PSRR test 4.5 5.5 V
MAX9710 12 30
Quiescent Supply Current
(IVDD + IPVDD)IDD MAX9711 7 17 mA
Shutdown Supply Current I SHDN SHDN = GND 0.5 30 µA
CBIAS = 1µF (10% of final value) 300
Turn-On Time tON CBIAS = 0.1µF (10% of final value) 30 ms
Thermal Shutdown Threshold 160 °C
Thermal Shutdown Hysteresis 15 °C
OUTPUT AMPLIFIERS
Output Offset Voltage VOS VOUT_+ - VOUT_-, AV = 2 ±2±14 mV
VDD = 4.5V to 5.5V 82 100
f = 1kHz 87
Power-Supply Rejection Ratio PSRR VRIPPLE = 200mVP-P
(Note 2) f = 20kHz 74
dB
RL = 8Ω1.1 1.4
RL = 4Ω2.6Output Power POUT fIN = 1kHz,
THD+N < 1% RL = 3Ω3
W
POUT = 1.2W, RL = 8Ω0.005
Total Harmonic Distortion Plus
Noise THD+N fIN = 1kHz, BW =
22Hz to 22kHz POUT = 2W, 4Ω0.01 %
Signal-to-Noise Ratio SNR RL = 8Ω, V
OU T
= 2.8V
RM S
, BW = 22H z to 22kH z95 dB
Slew Rate SR 1.6 V/µs
Maximum Capacitive Load Drive CLNo sustained oscillations 1 nF
Crosstalk fIN = 10kHz 77 dB
BIAS VOLTAGE (BIAS)
BIAS Voltage VBIAS 2.35 2.5 2.65 V
Output Resistance RBIAS 50 kΩ
DIGITAL INPUTS (MUTE, SHDN)
Input Voltage High VIH 2V
Input Voltage Low VIL 0.8 V
Input Leakage Current IIN ±1µA
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
_______________________________________________________________________________________ 3
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAx9710/11 toc01
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 3Ω
AV = -2V/V
POUT = 500mW
POUT = 2.5W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAx9710/11 toc02
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 3Ω
AV = -4V/V
POUT = 500mW
POUT = 2.5W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAx9710/11 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 4Ω
AV = -2V/V
POUT = 250mW
POUT = 2W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAx9710/11 toc04
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 4Ω
AV = -4V/V
POUT = 250mW
POUT = 2W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAx9710/11 toc05
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 8Ω
AV = -2V/V
POUT = 250mW
POUT = 1.2W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAx9710/11 toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
RL = 8Ω
AV = -4V/V
POUT = 250mW
POUT = 1.2W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9710/11 toc07
OUTPUT POWER (W)
THD+N (%)
321
0.01
0.1
1
10
100
0.001
04
AV = -2V/V
RL = 3Ω
f = 20Hz f = 10kHz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9710/11 toc08
OUTPUT POWER (W)
THD+N (%)
321
0.01
0.1
1
10
100
0.001
04
AV = -4V/V
RL = 3Ω
f = 20Hz
f = 10kHz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9710/11 toc09
OUTPUT POWER (W)
THD+N (%)
2.5 3.01.5 2.01.00.5
0.01
0.1
1
10
100
0.001
0 3.5
AV = -2V/V
RL = 4Ω
f = 20Hz
f = 10kHz
f = 1kHz
Typical Operating Characteristics
(VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
4 _______________________________________________________________________________________
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9710/11 toc10
OUTPUT POWER (W)
THD+N (%)
2.5 3.01.5 2.01.00.5
0.01
0.1
1
10
100
0.001
0 3.5
AV = -4V/V
RL = 4Ω
f = 20Hz
f = 10kHz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9710/11 toc11
OUTPUT POWER (W)
THD+N (%)
1.5 2.01.00.5
0.01
0.1
1
10
100
0.001
0
AV = -2V/V
RL = 8Ω
f = 20Hz
f = 10kHz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9710/11 toc12
OUTPUT POWER (W)
THD+N (%)
1.5 2.01.00.5
0.01
0.1
1
10
100
0.001
0
AV = -4V/V
RL = 8Ω
f = 20Hz
f = 10kHz
f = 1kHz
OUTPUT POWER
vs. TEMPERATURE
MAX9710/11 toc13
TEMPERATURE (°C)
OUTPUT POWER (W)
603510-15
1
2
3
4
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
RL = 3Ω
OUTPUT POWER
vs. TEMPERATURE
MAX9710/11 toc14
TEMPERATURE (°C)
OUTPUT POWER (W)
603510-15
1
2
3
4
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
RL = 4Ω
OUTPUT POWER
vs. TEMPERATURE
MAX9710/11 toc15
TEMPERATURE (°C)
OUTPUT POWER (W)
603510-15
0.5
1.0
1.5
2.0
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
RL = 8Ω
OUTPUT POWER vs. LOAD RESISTANCE
(FORCED-AIR COOLING)
MAX9710/11 toc16
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10010
1
2
3
4
5
0
1 1000
THD+N = 10%
THD+N = 1%
VDD = 5V
f = 1kHz
POWER DISSIPATION
vs. OUTPUT POWER
MAX9710/11 toc17
OUTPUT POWER (W)
POWER DISSIPATION (W)
2.01.50.5 1.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
0 2.5
RL = 4Ω
f = 1kHz
POWER DISSIPATION
vs. OUTPUT POWER
MAX9710/11 toc18
OUTPUT POWER (W)
POWER DISSIPATION (W)
1.000.750.25 0.50
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0
0 1.501.25
RL = 8Ω
f = 1kHz
Typical Operating Characteristics (continued)
(VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
_______________________________________________________________________________________ 5
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9710/11 toc19
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-80
-60
-40
-20
0
-100
10 100k
VRIPPLE = 200mVP-P
CROSSTALK vs. FREQUENCY
MAX9710/11 toc20
FREQUENCY (Hz)
CROSSTALK (dB)
1010.1
-100
-80
-60
-40
-20
0
-120
0.01 100
RIGHT TO LEFT
LEFT TO RIGHT
VIN = 200mVP-P
RL = 8Ω
ENTERING SHUTDOWN
MAX9710/11 toc21
RL = 8Ω
INPUT AC-COUPLED TO GND
100ms/div
OUT_+ AND
OUT_-
OUT_+ -
OUT_-
SHDN 2V/div
1V/div
200mV/div
EXITING SHUTDOWN
MAX9710/11 toc22
RL = 8Ω
INPUT AC-COUPLED TO GND
100ms/div
OUT_+ AND
OUT_-
OUT_+ -
OUT_-
SHDN 2V/div
1V/div
200mV/div
ENTERING POWER-DOWN
MAX9710/11 toc23
RL = 8Ω
INPUT AC-COUPLED TO GND
100ms/div
OUT_+ AND
OUT_-
OUT_+ -
OUT_-
VDD 2V/div
1V/div
200mV/div
EXITING POWER-DOWN
MAX9710/11 toc24
RL = 8Ω
INPUT AC-COUPLED TO GND
100ms/div
OUT_+ AND
OUT_-
OUT_+ -
OUT_-
VDD 2V/div
1V/div
200mV/div
Typical Operating Characteristics (continued)
(VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
6 _______________________________________________________________________________________
Pin Description
MAX9710
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9710/11 toc25
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.255.004.75
2
4
6
8
10
12
14
16
18
0
4.50 5.50
TA = +85°C
TA = +25°C
TA = -40°C
Typical Operating Characteristics (continued)
(VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9711
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9710/11 toc26
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.255.004.75
2
4
6
8
10
12
0
4.50 5.50
TA = +85°C
TA = +25°C
TA = -40°C
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9710/11 toc27
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
5.255.004.75
0.2
0.4
0.6
0.8
1.0
0
4.50 5.50
TA = +85°C
TA = +25°C
TA = -40°C
PIN
MAX9710 MAX9711 NAME FUNCTION
1 — INL Left-Channel Input
2 7 BIAS DC Bias Bypass. See BIAS Capacitor section for capacitor selection.
3, 10, 13, 16 — N.C. No Connection. Not internally connected.
4 9 MUTE Active-High Mute Input
5 — INR Right-Channel Input
6, 11, 15, 20 1, 3 PGND Power Ground
7 — OUTR+ Right-Channel Bridged Amplifier Positive Output
8, 18 5, 11 PVDD Output Amplifier Power Supply
9 — OUTR- Right-Channel Bridged Amplifier Negative Output
12 8 VDD Power Supply
14 10 SHDN Active-Low Shutdown. Connect SHDN to VDD for normal operation.
17 — OUTL- Left-Channel Bridged Amplifier Negative Output
19 — OUTL+ Left-Channel Bridged Amplifier Positive Output
— 2 IN Amplifier Input
— 6 GND Ground
— 12 OUT- Bridged Amplifier Negative Output
— 4 OUT+ Bridged Amplifier Positive Output
— — EP Exposed Pad. Connect to ground plane.
Detailed Description
The MAX9710/MAX9711 are 3W BTL speaker ampli-
fiers. The MAX9710 is a stereo speaker amplifier, while
the MAX9711 is a mono speaker amplifier. Both
devices feature a low-power shutdown mode, MUTE
mode, and comprehensive click-and-pop suppression.
These devices consist of high output-current op amps
configured as BTL amplifiers (see
Functional
Diagrams
). The device gain is set by RFand RIN.
BIAS
These devices operate from a single 5V supply and
feature an internally generated, power-supply-indepen-
dent, common-mode bias voltage of 2.5V referenced to
ground. BIAS provides both click-and-pop suppression
and sets the DC bias level for the audio outputs. BIAS
is internally connected to the noninverting input of each
speaker amplifier (see
Functional Diagrams
). Choose
the value of the bypass capacitor as described in the
BIAS Capacitor
section. No external load should be
applied to BIAS. Any load lowers the BIAS voltage,
affecting the overall performance of the device.
Shutdown
The MAX9710/MAX9711 feature a 0.5µA low-power shut-
down mode that reduces quiescent current consump-
tion. Pulling SHDN low disables the device’s bias
circuitry, the amplifier outputs are actively pulled low,
and BIAS is driven to GND. Connect SHDN to VDD for
normal operation.
MUTE
Both devices feature a clickless/popless MUTE mode.
When the device is muted, the input disconnects from
the amplifier. MUTE only affects the power amplifiers
and does not shut down the device. Drive MUTE high to
mute the device. Drive MUTE low for normal operation.
Click-and-Pop Suppression
The MAX9710/MAX9711 feature Maxim’s comprehen-
sive click-and-pop suppression. During startup, the
common-mode bias voltage of the amplifiers slowly
ramps to the DC bias point using an S-shaped wave-
form. When entering shutdown, the amplifier outputs are
actively driven low simultaneously. This scheme mini-
mizes the energy present in the audio band.
For optimum click-and-pop suppression, choose:
RIN x CIN < RBIAS x CBIAS
where RBIAS = 50kΩ.
Applications Information
BTL Amplifier
The MAX9710/MAX9711 are designed to drive a load
differentially, a configuration referred to as BTL. The
BTL configuration (Figure 1) 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 under similar conditions. Thus, the dif-
ferential gain of the device is twice the closed-loop gain
of the input amplifier. The effective gain is given by:
Substituting 2 x VOUT(P-P) for VOUT(P-P) into the follow-
ing equations yields four times the output power due to
doubling of the output voltage:
Since the differential outputs are biased at midsupply,
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.
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
_______________________________________________________________________________________ 7
+1 VOUT(P-P)
2 x VOUT(P-P)
VOUT(P-P)
-1
Figure 1. Bridge-Tied Load Configuration
MAX9710/MAX9711
Power Dissipation and Heat Sinking
Under normal operating conditions, the MAX9710/
MAX9711 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 temperature,
and θJA is the reciprocal of the derating factor in °C/W as
specified in the
Absolute Maximum Ratings
section. For
example, θJA of the 20-pin thin QFN package is
48.1°C/W.
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 (see
Layout and Grounding
section). 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 the MAX9710/MAX9711. When the junction
temperature exceeds +160°C, the thermal protection
circuitry disables the amplifier output stage. The
amplifiers are enabled once the junction temperature
cools by 15°C. A pulsing output under continuous
thermal-overload conditions results as the device heats
and cools.
Component Selection
Gain-Setting Resistors
External feedback components set the gain of both
devices. Resistors RFand RIN (
Functional Diagrams
)
set the gain of the amplifier as follows:
Input Filter
The input capacitor (CIN), in conjunction with RIN, forms
a highpass filter that removes the DC bias from an
incoming signal. The AC-coupling capacitor allows the
amplifier to bias the signal to an optimum DC level.
Assuming zero-source impedance, the -3dB point of
the highpass filter is given by:
For optimum click-and-pop suppression, choose:
RIN x CIN < RBIAS x CBIAS
where RBIAS = 50kΩ.
Setting f-3dB too high affects the low-frequency
response of the amplifier. Use capacitors with
dielectrics that have low-voltage coefficients, such as
tantalum or aluminum electrolytic. Capacitors with high-
voltage coefficients, such as ceramics, may result in an
increase of distortion at low frequencies.
BIAS Capacitor
BIAS is the output of the internally generated 2.5VDC
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
DC bias waveform for the speaker amplifiers. Bypass
BIAS with a 1µF capacitor to GND. Smaller values of
CBIAS produce faster tON/tOFF times but may result in
increased click/pop levels.
Supply Bypassing
Proper power-supply bypassing ensures low-noise,
low-distortion performance. Place a 0.1µF ceramic
capacitor from VDD to PGND. Add additional bulk
capacitance as required by the application. Locate the
bypass capacitor as close to the device as possible.
Piezoelectric Speaker Driver
Low-profile piezoelectric speakers can provide quality
sound for portable electronics. However, piezoelectric
speakers typically require large voltage swings
(>8VP-P) across the speaker element to produce
audible sound pressure levels. The MAX9711 can be
configured to drive a piezoelectric speaker with up to
10VP-P while operating from a single 5V supply.
Figure 2 shows the THD+N of the MAX9711 driving a
piezoelectric speaker. Note that as frequency increas-
es, the THD+N increases. This is due to the capacitive
nature of the piezoelectric speaker; as frequency
increases, the speaker impedance decreases, resulting
in a larger current draw from the amplifier.
fRC
dB IN IN
−=
3
1
2π
AR
R
VD F
IN
=×2
PV
R
DISS MAX DD
L
()
=22
2
π
PTT
DISSPKG MAX J MAX A
JA
() ()
=−
θ
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
8 _______________________________________________________________________________________
The capacitive nature of the piezoelectric speaker may
cause the MAX9711 to become unstable. A simple induc-
tor/resistor network in series with the speaker isolates the
speaker capacitance from the driver and ensures that the
device output sees a resistive load of about 10Ωat high
frequency, thereby maintaining stability (Figure 3).
Layout and Grounding
Good PC board layout is essential for optimizing perfor-
mance. Use large traces for the power-supply inputs and
amplifier outputs to minimize losses due to parasitic
trace resistance and route heat away from the device.
Good grounding improves audio performance,
minimizes crosstalk between channels, and prevents any
digital switching noise from coupling into the audio
signal.
The MAX9710/MAX9711 thin QFN package features an
exposed thermal pad on the underside. This pad low-
ers the thermal resistance of the package by providing
a direct-heat conduction path from the die to the print-
ed circuit board. Connect the exposed pad to the
ground plane using multiple vias, if required. For opti-
mum performance, connect to the ground planes as
shown in Figure 4.
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
_______________________________________________________________________________________ 9
TOTAL HARMONIC DISTORTI0N PLUS NOISE
vs. FREQUENCY
FREQUENCY (Hz)
THD+N (%)
1010.1
0.01
0.1
1
10
0.001
0.01 100
VOUT = 8VP-P
Figure 2. MAX9711 Piezoelectric Speaker Driver THD+N vs.
Frequency
MAX9711
IN
OUT+
OUT-
2
4
12
*PIEZOELECTRIC
SPEAKER.
*
AUDIO
INPUT
1μF15kΩ
15kΩ
10Ω
100μH
Figure 3. Isolation Network for Driving a Piezoelectric Speaker
MAX9710
PGND
PVDD
AUDIO SIGNAL
GND
VDD
5V
FOR OPTIMUM PERFORMANCE,
AUDIO GND SHOULD HAVE A
STAR CONNECTION TO THE HIGH
CURRENT, AMPLIFIER PGND AT
A SINGLE POINT, PIN 6.
Figure 4. MAX9710 Audio Ground Connection
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
10 ______________________________________________________________________________________
MAX9710
BIAS
LEFT AUDIO
INPUT
CIN
0.1μFRIN
15kΩ1
12
2
6, 11, 15, 20
2,18
INL
VDD
PVDD
BIAS
4
5
MUTE
INR
14
PGND
4.5V TO 5.5V
SUPPLY
CBIAS
1μF
0.1μF
SHDN
RIGHT AUDIO
INPUT
CIN
0.1μFRIN
15kΩ
RF
15kΩ
RF
15kΩ
10kΩ
10kΩ
19
17
9
PIN NUMBERS SHOWN ARE FOR THE 20 TQFN-EP PACKAGE.
7
OUTL+
OUTL-
OUTR-
OUTR+
10kΩ
10kΩ
Functional Diagrams
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
______________________________________________________________________________________ 11
BIAS
LEFT AUDIO
INPUT
CIN
0.1μFRIN
15kΩ2
8
7
IN
VDD
PVDD
BIAS
9MUTE
10
5,11
4.5V TO 5.5V
SUPPLY
CBIAS
1μF
RF
15kΩ
10kΩ
10kΩ
4
12
OUT+
OUT-
SHDN
GND PGND
6 1, 3
MAX9711
0.1μF
Functional Diagrams (continued)
12
OUT-
11
PVDD
10
45
PVDD
6
GND
1
2IN
3
9
8
7PGND
MUTE
VDD
BIAS
MAX9711
PGND
OUT+
QFN
SHDN
TOP VIEW
Pin Configurations (continued)
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
12 ______________________________________________________________________________________
Chip Information
MAX9710 TRANSISTOR COUNT: 1172
MAX9711 TRANSISTOR COUNT: 780
PROCESS: BiCMOS
MAX9710
MAX961
OUTR+
OUTR-
OUTL-
OUTL+
INR
INL
BIAS
PVDD
MUTE
VDD
SHDN
15kΩ
15kΩ
100kΩ
100kΩ
VCC
15kΩ
15kΩ
VDD (5V)
VCC (3.3V)
0.1μF
0.1μF
0.1μF
1μF
MAX4060
MAX4411
Q
Q
IN+
0.1μF
VDD/2
OUTL
OUTR
C1P CIN
PVSS
SVSS
SHDNL
SHDNR
1μF
1μF
1μF
INL
INR
AUX_IN
BIAS
IN+
IN-
2.2kΩ
0.1μF
0.1μF
0.1μF
CODEC
OUT
1μF
1μF
VCC
IN-
1μF
System Diagram
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
20 TQFN-EP T2055-4 21-0140
12 TQFN-EP T1244-4 21-0139
MAX9710/MAX9711
3W Mono/Stereo BTL Audio Power Amplifiers
with Shutdown
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 4/03 Initial release —
1 6/08 Removed TSSOP package 1, 2, 6, 9, 10
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.
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13
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