MAX4061EUA+T - Maxim Integrated

General Description

The MAX4060/MAX4061/MAX4062 are differential-input

microphone preamplifiers optimized for notebook and

PDA audio systems. These devices feature adjustable

gain with excellent power-supply rejection and common-

mode rejection ratios, making them ideal for lownoise

applications in portable audio systems.

The MAX4060/MAX4062 are capable of switching their

output between the differential input and a single-ended

auxiliary microphone amplifier input. In addition, the

MAX4060/MAX4062 have a low-noise microphone bias

generator. The differential gain of the MAX4061/MAX4062

is set with a single resistor. The MAX4060 has a fixed gain

of 10V/V and is PC99/2001 compliant. The MAX4061

includes a complete shutdown mode. In shutdown, the

supply current is reduced to 0.3μA and the current to the

microphone bias is cut off for ultimate power savings.

The MAX4060 operates from a 4.5V to 5.5V single sup-

ply and the MAX4061/MAX4062 operate from 2.4V to

5.5V. All devices are specified over the extended operat-

ing temperature range, -40°C to +85°C. The MAX4060/

MAX4061 are available in tiny 8-pin TDFN (3mm x 3mm

x 0.8mm) and 8-pin μMAX® packages. The MAX4062 is

available in a 10-pin μMAX package.

Applications

●Notebook Audio

Systems

●Tablet PCs

●PDA Audio Systems

●USB Audio Peripherals

●AES-42-Compliant

Microphones

●Signal Conditioning

Features

●2.4V to 5.5V Single-Supply Operation

●Adjustable Gain or Fixed-Gain Options

●High PSRR (86dB at 1kHz)

●High CMRR (70dB at 1kHz)

●Low Input-Referred Noise

●Integrated Microphone Bias

● 750μA Supply Current

● 0.3μA Shutdown Current

●±4kV ESD Protection (AUX_IN)

●Rail-to-Rail Outputs

●THD+N: 0.04% at 1kHz

●Available in Space-Saving Packages

• 8-Pin TDFN (MAX4060/MAX4061)

• 8-Pin μMAX (MAX4060/MAX4061)

• 10-Pin μMAX (MAX4062)

19-2408; Rev 4; 11/18

μMAX is a registered trademark of Maxim Integrated Products, Inc.

Pin Configurations and Selector Guide appear at end of

data sheet.

*EP = Exposed pad.

+Denotes a lead(Pb)-free/RoHS-compliant package.

PART TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

MAX4060ETA+ -40°C to +85°C 8 TDFN-EP* ABY

MAX4060EUA+ -40°C to +85°C 8 µMAX —

MAX4061ETA+ -40°C to +85°C 8 TDFN-EP* ABZ

MAX4061EUA+ -40°C to +85°C 8 µMAX —

MAX4062EUB+ -40°C to +85°C 10 µMAX —

BIAS

AUX_IN

IN-

IN+

VCC

2.4V TO 5.5V

MAX4060

INT/AUX 1

OUT 2

GND

BIAS

VBIAS

x10

BIAS

x10

MAX4060/MAX4061/

MAX4062

Differential Microphone Preamplifiers with

Internal Bias and Complete Shutdown

Typical Operating Circuit

Ordering Information

Click here for production status of specic part numbers.

Supply Voltage (VCC to GND). ...............................-0.3V to +6V

Any Other Pin to GND .............................. -0.3V to (VCC + 0.3V)

Duration of Short Circuit to GND or VCC ..................Continuous

Continuous Input Current (any pin) .................................. ±10mA

Continuous Power Dissipation (TA = +70°C)

8-Pin TDFN (derate 24.4mW/°C above +70°C) .....1951.2mW

8-Bump μMAX (derate 4.8mW/°C above +70°C) .....387.8mW

10-Bump μMAX (derate 8.8mW/°C above +70°C) ...707.3mW

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

Soldering Temperature (reflow) ....................................... +260°C

(VCC = 3V for MAX4061/MAX4062, VCC = 5V for MAX4060, VGND = 0V, VSHDN = VCC, VINT/AUX = 0V, RG = 11.11kΩ,

RL = 100kΩ to 1.5V, RBIAS = ∞, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range VCC

Inferred from

PSRR test

MAX4061/MAX4062 2.4 5.5 V

MAX4060 4.5 5.5

Supply Current ICC 0.75 1.2 mA

Output Common-Mode Voltage VOCM 1.25 1.5 1.75 V

Slew Rate SR AV = 10V/V ±1 V/µs

Supply Current in Shutdown ISHDN VSHDN = 0V, MAX4061 0.001 1 µA

Output Short-Circuit Current ISC

To GND 30 mA

To V CC 30

DIFFERENTIAL INPUT (VINT/AUX = 0V for MAX4060/MAX4062, default for MAX4061)

Input Offset Voltage VOS ±0.1 ±5 mV

Common-Mode Input Voltage

Range VCM 1 2 V

Maximum Differential Input Voltage VDIFFMAX AV = 1V/V, MAX4061/MAX4062 1 V

Small-Signal Bandwidth BW-3dB 600 kHz

Input Resistance RIN Either differential input 100 kΩ

Input Resistance Match RMATCH 1 %

Input Noise-Voltage Density en

AV = 10V/V, f = 1kHz 100

nV/√Hz

AV = 100V/V, f = 1kHz, MAX4061/MAX4062

only 20

RMS Output Noise Voltage VNRMS AV = 10V/V, BW = 22Hz to 22kHz 125 µVRMS

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Absolute Maximum Ratings

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.

Electrical Characteristics

(VCC = 3V for MAX4061/MAX4062, VCC = 5V for MAX4060, VGND = 0V, VSHDN = VCC, VINT/AUX = 0V, RG = 11.11kΩ,

RL = 100kΩ to 1.5V, RBIAS = ∞, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Total Harmonic Distortion

Plus Noise THD+N AV = 10V/V, f = 1kHz, VOUT = 0.7VRMS,

BW = 22Hz to 22kHz 0.04 %

Differential Gain AVDIFF

1V < VCM < 2V,

VOUT = 0.7VRMS,

MAX4061/MAX4062

RG = open 1 1.13 1.3

V/V

RG = 11.11kΩ 9.6 10 10.4

RG = 1.01kΩ 96 100 104

1V < VCM < 2V, VOUT = 0.7VRMS, MAX4060 9.6 10.0 10.4

Common-Mode Rejection Ratio CMRR VCM = 500mVP-P, f = 1kHz 70 dB

Power-Supply Rejection Ratio PSRR

TA = +25°C 72 89

dBTA = TMIN to TMAX 60

VCC = 5V ±100mV, f = 1kHz 86

AUXILIARY INPUT (MAX4060/MAX4062, INT/AUX = VCC)

Small-Signal Bandwidth BW-3dB 200 kHz

Input Resistance RIN 100 kΩ

Input Noise-Voltage Density enf = 1kHz 45 nV/√Hz

RMS Output Noise Voltage VNRMS BW = 22Hz to 22kHz 385 µVRMS

Total Harmonic Distortion

Plus Noise THD+N f = 1kHz, BW = 22Hz to 22kHz 0.05 %

Power-Supply Rejection Ratio PSRR TA = +25°C 65 90 dB

TA = TMIN - TMAX 50

Voltage Gain AVAUX VOUT = 0.7VRMS -10.7 -10 -9.3 V/V

BIAS OUTPUT (MAX4060/MAX4062)

Output Voltage VOUT

IBIAS = 0.8mA to GND, MAX4060 2 2.2 V

IBIAS = 0.5mA to GND, MAX4062 2 2.2

Output Resistance ROUT

IBIAS = 0.8mA to GND, MAX4060

(TA = +25°C) 2 2.5 kΩ

IBIAS = 0.5mA to GND, MAX4062

(TA = +25°C) 22 40 Ω

Output Noise Voltage VNRMS

IBIAS = 0.8mA to GND, BW = 22Hz to

22kHz, MAX4060 50

µVRMS

IBIAS = 0.5mA to GND, BW = 22Hz to

22kHz, MAX4062 20

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Electrical Characteristics (continued)

(VCC = 3V for MAX4061/MAX4062, VCC = 5V for MAX4060, VGND = 0V, VSHDN = VCC, VINT/AUX = 0V, RG = 11.11kΩ,

RL = 100kΩ to 1.5V, RBIAS = ∞, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2)

Note 1: All specifications are 100% tested at TA = +25°C. Specification limits over temperature (TA = TMIN to TMAX) are guaranteed

by design, not production tested.

Note 2: MAX4062 requires a 1μF capacitor from BIAS to ground.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Rejection Ratio PSRR

MAX4060

IBIAS = 0.8mA to GND,

VCC = 4.5V to 5.5V 50 80

IBIAS = 0.8mA, VCC = 5V

+ 100mVP-P, f = 1kHz 70

MAX4062

IBIAS = 0.5mA to GND,

VCC = 2.4V to 5.5V 50 74

IBIAS = 0.5mA, VCC = 3V

+ 100mVP-P, f = 1kHz 71

DIGITAL INPUTS (SHDN for MAX4061 and INT/AUX for MAX4060/MAX4062)

Input Leakage Current IIN VIN = 0V or VCC ±1 µA

Input-Voltage High VINH

0.7 x

VCC

Input-Voltage Low VINL

0.3 x

VCC

Shutdown Enable Time tON MAX4061 10 µs

Shutdown Disable Time tOFF MAX4061 10 µs

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Electrical Characteristics (continued)

(VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL ≥ 100kΩ to 1.5V, SHDN = VCC (MAX4061 only),

TA = +25°C, unless otherwise noted.)

MAX4060 toc02

FREQUENCY (Hz)

PSRR (dB)

100k10k1k100

-100

-80

-60

-40

-20

-120

10 1M

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (DIFF INPUT)

AV = 100V/V

AV = 10V/V

SUPPLY CURRENT vs. TEMPERATURE

MAX4060 toc03

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

80655035205-10-25

0.2

0.4

0.6

0.8

1.0

-40

VCC = 3V

VCC = 5V

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX4060 toc04

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

5.04.53.5 4.03.02.5

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

2.0 5.5

AV = 10V/V

NO LOAD

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX4060 toc05

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT (nA)

603510-15

0.01

0.1

100

0.001

-40 85

OUTPUT-VOLTAGE HIGH

vs. TEMPERATURE

MAX4060 toc06

TEMPERATURE (°C)

VOH (mV)

603510-15

100

1000

-40 85

ILOAD = 2.5mA

ILOAD = 50µA

VOH = VCC - VOUT

OUTPUT-VOLTAGE LOW

vs. TEMPERATURE

MAX4060 toc07

TEMPERATURE (°C)

VOL (mV)

603510-15

100

1000

-40 85

ILOAD = 2.5mA

ILOAD = 50µA

MAX4060 toc01

FREQUENCY (Hz)

GAIN (dB)

100k10k1k100

-12

-9

-6

-3

-15

10 1M

GAIN vs. FREQUENCY

(NO LOAD)

VCC = 5V

OUTPUT-VOLTAGE HIGH

vs. LOAD CURRENT

MAX4060 toc08

LOAD CURRENT (mA)

VOH (mV)

4321

100

125

150

175

0 5

VOH = VCC - VOUT

VCC = 3V

OUTPUT-VOLTAGE LOW

vs. LOAD CURRENT

MAX4060 toc09

LOAD CURRENT (mA)

VOL (mV)

4321

100

150

200

250

300

0 5

VCC = 3V

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

Maxim Integrated

│

www.maximintegrated.com

Typical Operating Characteristics

(VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL ≥ 100kΩ to 1.5V, SHDN = VCC (MAX4061 only),

TA = +25°C, unless otherwise noted.)

MAX4060

MIC BIAS VOLTAGE vs. TEMPERATURE

MAX4060 toc10

TEMPERATURE (°C)

MIC BIAS VOLTAGE (V)

6035-15 10

2.125

2.150

2.175

2.200

2.225

2.250

2.275

2.300

2.100

-40 85

IBIAS = 800mA

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (DIFF INPUT)

MAX4060 toc11

FREQUENCY (Hz)

THD+N (%)

10k1k100

0.01

0.1

0.001

10 100k

VOUT = 2.26VP-P

VCC = 5V

VCC = 3V

MAX4060 toc12

FREQUENCY (Hz)

THD+N (%)

10k1k100

0.01

0.1

0.001

10 100k

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (AUX INPUT)

VCC = 3V

VCC = 5V

VOUT = 2.26VP-P

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE

(DIFF INPUT, VCC = 3V)

MAX4060 toc13

OUTPUT VOLTAGE (VP-P)

THD+N (%)

2.52.01.51.00.5

0.01

0.1

0.001

0 3.0

f = 10kHz

f = 1kHz

BW = 22kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE

(DIFF INPUT, VCC = 5V)

MAX4060 toc14

OUTPUT VOLTAGE (VP-P)

THD+N (%)

3.02.52.01.51.00.5

0.01

0.1

0.001

0 3.5

f = 10kHz

f = 1kHz

BW = 22kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE

(AUX INPUT, VCC = 3V)

MAX4060 toc15

OUTPUT VOLTAGE (VP-P)

THD+N (%)

2.52.01.51.00.5

0.01

0.1

0.001

0 3.0

f = 10kHz

f = 1kHz

BW = 22kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE

(AUX INPUT, VCC = 5V)

MAX4060 toc16

OUTPUT VOLTAGE (VP-P)

THD+N (%)

3.02.52.01.51.00.5

0.01

0.1

0.001

03.5

f = 10kHz

f = 1kHz

BW = 22kHz

MAX4060 toc17

FREQUENCY (Hz)

(nV/√Hz)

10k1k100

100

200

300

400

500

600

700

800

10 100k

INPUT-REFERRED NOISE

vs. FREQUENCY (DIFF INPUT)

MAX4060

MIC BIAS OUTPUT NOISE

MAX4060 toc18

100ms/div

5µV/div

VCC = 5V

BW = 22Hz TO 22kHz

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

Maxim Integrated

│

www.maximintegrated.com

Typical Operating Characteristics (continued)

(VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL ≥ 100kΩ to 1.5V, SHDN = VCC (MAX4061 only),

TA = +25°C, unless otherwise noted.)

MAX4062

MIC BIAS OUTPUT NOISE

MAX4060 toc19

100ms/div

5µV/div

VCC = 5V

BW = 22Hz TO 22kHz

SMALL-SIGNAL TRANSIENT RESPONSE

FOR DIFF INPUT

MAX4060 toc20

10µs/div

INPUT

5mV/div

OUTPUT

50mV/div

SMALL-SIGNAL TRANSIENT RESPONSE

FOR AUX INPUT

MAX4060 toc21

10µs/div

INPUT

5mV/div

OUTPUT

50mV/div

LARGE-SIGNAL TRANSIENT RESPONSE

FOR DIFF INPUT

MAX4060 toc22

10µs/div

INPUT

100mV/div

OUTPUT

1V/div

LARGE-SIGNAL TRANSIENT RESPONSE

FOR AUX INPUT

MAX4060 toc23

10µs/div

INPUT

200mV/div

OUTPUT

1V/div

OUTPUT OVERDRIVEN

MAX4060 toc24

10µs/div

INPUT

500mV/div

OUTPUT

1V/div

DIFFERENTIAL INPUT

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

Maxim Integrated

│

www.maximintegrated.com

Typical Operating Characteristics (continued)

Detailed Description

The MAX4060/MAX4061/MAX4062 are differential micro-

phone preamplifiers providing high-quality audio, opti-

mized for use in computer and mobile applications. These

devices feature rail-to-rail outputs, very high power-supply

rejection, and common-mode rejection, making them

ideal for low-noise applications. The MAX4060/MAX4061/

MAX4062 are particularly effective when layout con-

straints force the microphone amplifier to be physically

remote from the ECM microphone and/or the rest of the

audio circuitry.

The MAX4060/MAX4062 are capable of switching their

output between the differential input and an inverting

single-ended input. INT/AUX selects either the differ-

ential input or single-ended auxiliary input. In addition,

the MAX4060 has an internal bias generator to bias the

microphone in either differential or single-ended modes.

The MAX4061 includes a complete 0.3μA shutdown

mode for ultimate power savings. The differential gain of

the MAX4061/MAX4062 is set with a single resistor con-

nected between the G1 and G2 pins. The MAX4060 has

a fixed gain of 10V/V.

Differential Input

The main microphone input is a low-noise, differential

input structure. This is an almost essential element when

faced with amplification of low-amplitude analog signals

in digitally intense environments such as notebook PCs

or PDAs. Used correctly, the advantages over a single-

ended solution are:

●Better power-supply noise rejection.

●Less degradation from noise in PC board ground

planes.

● The microphone and preamplier can be placed

physically further apart, easing PC board layout

restrictions.

PIN NAME FUNCTION

MAX4060 MAX4061 MAX4062

1 — 2 INT/AUX Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low

to select internal or high to select auxiliary microphone input.

2 3 3 OUT Amplier Output. OUT is high impedance when in shutdown mode.

3 — — BIAS External Electret Microphone Capsule Bias Output. BIAS has a greater than 2kΩ

output impedance.

4 4 5 VCC Power Supply. Bypass the VCC to GND with a 0.1µF capacitor.

5 5 6 IN+ Noninverting Differential Amplier Input. AC-couple the audio signal into IN+.

6 6 7 IN- Inverting Differential Amplier Input. AC-couple the audio signal into IN-.

7 7 8 GND Ground

8 — 9 AUX_IN Single-Ended Input for Auxiliary Microphone. AC-couple the audio signal into

AUX_IN.

— 1 1 G2

Gain-Selectable Input. Connect an external resistor between G1 and G2 to set

the gain for the differential amplier. (See Adjustable Differential-Gain Setting

section.)

— 2 — SHDN Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for

shutdown mode.

— — 4 BIAS External Electret Microphone Capsule Bias Output. Bypass BIAS with 1µF

capacitor to ground.

— 8 10 G1 Gain-Selectable Input. Connect an external resistor between G1 and G2 to set

the gain for the differential amplier.

— — — EP

Exposed Pad (TDFN Only). Internally connected to GND. Connect to a large

ground plane to minimize thermal performance. Not intended as an electrical

connection point.

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Pin Description

Fixed Differential Gain (MAX4060)

The MAX4060 has an internal fixed gain of 10V/V for its

differential input. This feature simplifies design, reduces

pin count, footprint, and eliminates external gain-setting

resistors.

Adjustable Differential-Gain Setting

The MAX4061/MAX4062 allow the user to alter the gain

to optimize the signal-to-noise ratio (SNR) of their system.

The gain is set by a single external resistor (RG) con-

nected between the G1 and G2 pins, where:

RG = 100kΩ / (AV - 1)

where AV is the required voltage gain.

Hence, an 11.11kΩ resistor yields a gain of 10V/V, or

20dB. Leaving the pins unconnected results in a gain of

1V/V. Gain for the MAX4061/MAX4062 is defined as:

AV = VOUT / (VIN+ - VIN-)

The resistor can be either fixed or variable, allowing the

use of a digitally controlled potentiometer to alter the gain

under software control.

Input Capacitors

The two differential microphone inputs and the sin-

gle-ended auxiliary input of the MAX4060/MAX4061/

MAX4062 have on-chip bias components, allowing the

user to AC-couple any signals onto the input. The input

resistance is 100kΩ (typ), so the capacitor size may be

chosen accordingly to define the LF rolloff desired. This

can be calculated as:

CIN = 1 / (2πfCUTRIN)

This assumes a low source impedance driving the inputs.

A further consideration for the differential input is the

effect of these series input capacitors on low-frequency,

common-mode rejection. Any mismatch in the values of

these two capacitors degrades the CMRR at frequen-

cies where the impedance of the capacitor is significant

compared to the input resistance of the amplifier—this is

usually most noticeable at low frequencies. One way to

avoid the need for matched or tight tolerance capacitors

is to deliberately oversize the values on the differential

BIAS

IN-

IN+

VCC

2.4V TO 5.5V

MAX4060

INT/AUX 1

OUT 2

GND

BIAS

VBIAS BIAS

x10

BIAS

8AUX_IN

x10

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Functional Diagram

inputs and to set the lower 3dB point (fCUT) of the ampli-

fier by sizing the output capacitor appropriately.

The input impedance matching on the differential input

is typically 1%, allowing input capacitor matching to be

effective at improving low-frequency PSRR.

Common-Mode Rejection Ratio

The common-mode rejection ratio (CMRR) refers to the

amount of rejection that the amplifier is capable of provid-

ing to any signal applied equally to the IN+ and INinputs.

In the case of amplifying low-level microphone signals in

noisy digital environments, it is a key figure of merit. In

audio circuits, this is generally measured for VIN as an

AC signal:

CMRR(dB) = ADM / ACM

where ADM is the differential gain, ACM is the common-

mode gain.

Input voltages are sufficiently small such that the output is

not clipped in either differential or common-mode applica-

tion. The topology used in the MAX4061/MAX4062 means

that the CMRR actually improves at higher differential

gains—another advantage of using differential sensing.

Auxiliary Input

The auxiliary input is a single-ended input intended to be

used with a jack-socket-type microphone input (Figure 1).

Internal DC-bias components (as on the main inputs) allow

the input signal to be AC-coupled. Mechanically switched

jack sockets can be used in conjunction with the INT/AUX

select pin, allowing the auxiliary microphone input to be

automatically selected when a jack socket is inserted.

Microphone Bias Voltage

MAX4060

The MAX4060 has a microphone bias voltage designed

to comply with the Microsoft/Intel PC99/2001 audio stan-

dard. It features source impedance of greater than 2kΩ,

and delivers more than 2V of bias when loaded with a cur-

rent of 800μA. This limits operation of this part to supplies

between 4.5V to 5.5V (see Figure 2).

Figure 1. MAX4062 with Auxiliary Input Configuration

AUX_IN

IN-

IN+

VCC

2.4V TO 5.5V

MAX4062

GND

VBIAS

BIAS

RBIAS

CBIAS

100kΩ

OUT 3

INT/AUX

x10

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

MAX4061/MAX4062

The MAX4062 has a lower bias voltage and low-imped-

ance outputs (optimum electret bias resistor can then be

set externally). This gives a low-noise, flexible solution

that can run from 2.4V to 5.5V, suitable for handheld

devices such as PDAs that typically have audio power

supplies in the 3V region (see Figure 3).

In applications where the differential microphone is placed

some distance from the MAX4060/MAX4061/MAX4062,

using a remote differential bias scheme as shown in

Figure 4 can provide improved noise rejection.

Output

MAX4060/MAX4061 DC Bias

The output voltage has a DC-bias voltage independent

of the power supplies, resulting in superior PSRR perfor-

mance. The MAX4061 output is high impedance when the

part is in shutdown mode. AC-coupling the output into the

next audio stage (e.g., CODEC) is recommended.

Applications Information

Shutdown Mode

The MAX4061 features a low-power, complete shutdown

mode. When SHDN goes low, the supply current drops

to 0.3μA, the output enters a high-impedance state, and

the bias current to the microphone is switched off. Driving

SHDN high enables the amplifier. SHDN should not be

left unconnected.

Power Supplies and Layout

The MAX4060 operates from a 4.5V to 5.5V single sup-

ply and the MAX4061/MAX4062 operate from a 2.4V to

5.5V single supply. Bypass the power supply with a 0.1μF

capacitor to ground. In systems where analog and digital

grounds are available, the MAX4060/MAX4061 should be

connected to the analog ground.

Figure 2. MAX4060 Used for Biasing a Microphone

IN-

IN+

VCC

4.5V TO 5.5V

MAX4060

INT/AUX 1

OUT 2

GND

x10

VBIAS

x10

BIAS

AUX_IN

MICROPHONE

INPUT 8

RBIAS

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Figure 3. MAX4062 Used to Bias a Microphone Connected to the Auxiliary Input and the Differential Input

2.2kΩ

AUX_IN9

IN-

IN+

VCC

2.4V TO 5.5V

MAX4062

GND

0.1µF

11kΩ

BIAS VBIAS

0.1µF

x10

OUT

INT/AUX 2

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Figure 4. Remote Differential Microphone Bias Network Optimizes Noise Rejection in Long-Run, PC Board Traces

2.2kΩ

1kΩ

AUX_IN

IN-

IN+

VCC

2.4V TO 5.5V

MAX4062

GND

0.1µF

11kΩ

BIAS VBIAS

0.1µF

x10

OUT

INT/AUX 2

1kΩ

VDD

2.2µF

1kΩ

2.2µF

AUX_IN

GND

IN-

IN+

EP*

VCC

*CONNECT EP TO GND (TDFN ONLY).

BIAS

OUT

INT/AUX

MAX4060

µMAX/TDFN

GND

IN-

IN+VCC

OUT

SHDN

MAX4061

µMAX/TDFN

TOP VIEW

AUX_IN

GND

IN-BIAS

OUT

INT/AUX

MAX4062

µMAX

IN+VCC

EP*

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Pin Congurations

*See Block Diagrams.

PACKAGE

TYPE

PACKAGE

CODE

DOCUMENT

NO.

LAND

PATTERN NO.

8 TDFN T833+2 21-0137 90-0059

8 μMAX U8+1 21-0036 90-0092

10 μMAX U10+2 21-0061 90-0330

PRODUCT* AUXILIARY

INPUT

DIFF INPUT

GAIN

SINGLE-ENDED

INPUT

GAIN (dB)

MICROPHONE

BIAS

SHUTDOWN

MODE

SUPPLY

VOLTAGE

(V)

MAX4060 ✔20dB 20 ✔— 4.5 to 5.5

MAX4061 — ADJ — — ✔2.4 to 5.5

MAX4062 ✔ADJ 20 ✔— 2.4 to 5.5

IN-

IN+

VCC

4.5V TO 5.5V

INT/AUX 1

OUT 2

GND

x10

VBIAS

x10

BIAS

AUX_IN

IN-

IN+

SHDN

VCC

2.4V TO 5.5V

OUT 3

GND

G1 G2 IN-

IN+

VCC

2.4V TO 5.5V

INT/AUX 2

OUT 3

GND

x10

VBIAS

BIAS

AUX_IN

G1 G2

MAX4061

MAX4062

MAX4060

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

www.maximintegrated.com Maxim Integrated

│

Chip Information

PROCESS: BiCMOS

Package Information

For the latest package outline information and land patterns

(footprints), go to www.maximintegrated.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.

Selector Guide

Block Diagrams

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

3 4/11 Added exposed pad information to Pin Description and Pin Congurations sections 8, 13

4 11/18 Updated Package Information sections 14

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

are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)

shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

MAX4060/MAX4061/

MAX4062

Differential Microphone Preampliers with

Internal Bias and Complete Shutdown

│

Revision History

For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.