MAX4063 データシートの表示（PDF） - Maxim Integrated

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MAX4063

Differential Microphone Preamplifier with Internal Bias and Complete Shutdown

Maxim Integrated 

Differential Microphone Preamplifier with

Internal Bias and Complete Shutdown

PIN

TSSOP

QFN

1

15

2

16

3

1

4

2

5

3

6

4

7

5

8

7

9

9

10

10

11

11

12

12

13

6, 8, 14

14

13

Pin Description

NAME

FUNCTION

G2

INT/AUX

SHDN

OUT

BIAS

VCC

ADJ

OUT

IN+

IN-

GND

AUX_IN

N.C.

G1

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

the differential amplifier (see Adjustable Differential Gain-Setting section).

Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low to select

differential in or high to select auxiliary in.

Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for shutdown

mode.

Amplifier Output. OUT is high impedance when in shutdown mode.

External Electret Microphone Capsule Bias Output. Bypass BIAS with a 1µF capacitor to

ground.

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

Adjustable Gain Select for AUX_IN (see Auxiliary Input-Gain Adjustment section). Connect

a 10pF capacitor between OUT and ADJ.

Complementary Amplifier Output. OUT is high impedance in shutdown mode.

Noninverting Differential Amplifier Input. AC-couple the audio signal into IN+.

Inverting Differential Amplifier Input. AC-couple the audio signal into IN-.

Ground

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

No Connection. Not internally connected.

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

the differential amplifier.

Detailed Description

The MAX4063 is a differential microphone pre-

amplifier providing high-quality amplification, optimized

for use in computer and mobile applications. This device

features adjustable gain, very high power-supply rejec-

tion (95dB), and common-mode rejection (79dB), making

it ideal for low-noise applications. The MAX4063 provides

a differential input stage, making the device particularly

effective when layout constraints force the microphone

amplifier to be physically remote from the ECM micro-

phone.

The MAX4063 is capable of switching its output

between the differential input and an inverting single-

ended input. INT/AUX selects either the differential

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

MAX4063 has an integrated microphone bias source,

simplifying system design and eliminating the need for

external components. The MAX4063 has a complemen-

tary output allowing CODECs and other devices with

differential inputs to be optimally driven (see Functional

Diagram). The MAX4063 includes a 0.3µA shutdown

mode for ultimate power savings. The differential gain

of the MAX4063 is set with a single resistor connected

between the G1 and G2 pins. The MAX4063 has an

internal default gain of 20V/V on the AUX_IN input. The

AUX_IN gain can be increased with a single external

resistor (see the Differential-Gain Adjustment and

Auxiliary Input-Gain Adjustment sections).

Differential Input

The main microphone amplifier is a low-noise, differen-

tial input structure. This is an almost essential element

when faced with amplification of low-amplitude analog

signals in digitally intense environments such as note-

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