19-2753; Rev 1; 6/11

Differential Microphone Preamplifier with

Internal Bias and Complete Shutdown

General Description

The MAX4063 is a differential-input microphone preampli-

fier optimized for high-performance, portable applica-

tions. The device features two selectable inputs,

differential outputs, adjustable gain, an integrated low-

noise bias source, and a low-power shutdown mode.

Two input paths provide both differential and single-

ended microphone sensing. The high-noise rejection of

the differential input is ideally suited to an internal micro-

phone where system noise and long-run PC board traces

can degrade low-level signals. The single-ended input

provides a simple connection to an external microphone.

The differential and single-ended inputs have indepen-

dent, adjustable gains that are set with a single external

resistor. Differential outputs provide a full-scale signal of

up to 6V

P-P

from a single 3V supply, optimizing the

dynamic range of the amplified signal. A complete shut-

down mode reduces the supply current to only 0.3µA

and disables the microphone bias for the ultimate in

power savings.

The MAX4063 operates from 2.4V to 5.5V and is specified

over the extended -40°C to +85°C operating temperature

range. The MAX4063 is available in both 16-pin TQFN

(4mm x 4mm x 0.8mm) and 14-pin TSSOP packages.

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Features

2.4V to 5.5V Single-Supply Operation

Differential Inputs and Outputs

Adjustable Gain

High 95dB PSRR

High 79dB CMRR

Low-Noise, Integrated Microphone Bias

750µA Supply Current

0.3µA Shutdown Current

±4kV ESD Protection (AUX_IN)

THD+N: 0.05% at 1kHz

Available in Space-Saving Packages

14-Pin TSSOP

16-Pin TQFN (4mm x 4mm x 0.8mm)

MAX4063

Ordering Information

PART

MAX4063ETE+

MAX4063EUD+

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

PIN-PACKAGE

16 TQFN-EP*

14 TSSOP

Applications

Notebook Audio Systems

Tablet PCs

PDA Audio Systems

Signal Conditioning

*EP = Exposed pad.

+Denotes

a lead(pB)-free/RoHS-compliant package.

Typical Operating Circuit

2.4V TO 5.5V

6

V

CC

3

Pin Configurations

SHDN

INT/AUX 2

7

12 AUX_IN

ADJ

+

G2 1

INT/AUX

SHDN

2

3

14 G1

13 N.C.

12 AUX_IN

MAX4063

5 BIAS

V

BIAS

OUT 4

OUT 8

OUT 4

BIAS 5

V

CC

6

ADJ 7

MAX4063

11 GND

10 IN-

9

8

IN+

OUT

G1 G2

14 1

R

G

GND

11

9 IN+

10 IN-

TSSOP

Pin Configurations continued at end of data sheet.

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Maxim Integrated Products

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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.