4063 查看數據表（PDF） - Maxim Integrated

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4063

Differential Microphone Preamplifier with Internal Bias and Complete Shutdown

Maxim Integrated 

Differential Microphone Preamplifier with

Internal Bias and Complete Shutdown

Functional Diagram

BIAS

12 AUX_IN

BIAS

RG

14 G1

1 G2

9 IN+

2.4V TO 5.5V

6

VCC

MAX4063

INT/AUX 2

ADJ 7

OUT 4

OUT 8

10 IN-

VCC

3 SHDN

VBIAS

SHDN

GND

11

BIAS

5

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 may be placed

physically further apart, easing PC board layout

restrictions.

Differential-Gain Adjustment

The MAX4063 allows the user to alter the differential

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

system. The gain is set by a single external resistor

(RG) connected between the G1 and G2 pins:

RG

=

200kΩ

AVD − 2

where AV is the required voltage gain.

Hence, an 11.11kΩ resistor yields a gain of 20V/V, or

26dB. Leaving the pins unconnected results in a gain of

2V/V. Gain is defined as:

For differential out:

A VD

=

VOUT

VIN+

− VOUT

− VIN-

The resistor can be either fixed or variable, allowing the

use of a digitally controlled potentiometer to alter the

gain under software control.

Auxiliary Input-Gain Adjustment

The MAX4063 provides an option to increase the

AUX_IN (see Figure 3). To increase the gain, connect

resistor RADJ between the ADJ and AUX_IN pins. RADJ is

calculated from the following formula:

RADJ =

2MΩ

AVAUX − 20

(to

increase

the

gain)

8 _______________________________________________________________________________________

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