MAX4062 데이터 시트보기 (PDF) - Maxim Integrated

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MAX4062

Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown

Maxim Integrated 

Differential Microphone Preamplifiers with

Internal Bias and Complete Shutdown

Pin Description

PIN

MAX4060 MAX4061 MAX4062

1

—

2

2

3

3

3

—

—

4

4

5

5

5

6

6

6

7

7

7

8

8

—

9

—

1

1

—

2

—

—

—

4

—

8

10

NAME

INT/AUX

OUT

BIAS

VCC

IN+

IN-

GND

AUX_IN

G2

SHDN

BIAS

G1

FUNCTION

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

to select internal or high to select auxiliary microphone input.

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

External Electret Microphone Capsule Bias Output. BIAS has a greater than

2kΩ output impedance.

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

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.

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.)

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

shutdown mode.

External Electret Microphone Capsule Bias Output Bypass BIAS with 1µF

Capacitor to Ground

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

the gain for the differential amplifier.

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 constraints 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 differen-

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

MAX4060/MAX4061 have 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 connected 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 note-

book 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 preamplifier can be placed

physically further apart, easing PC board layout

restrictions.

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