BA7781 データシートの表示（PDF） - ROHM Semiconductor

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BA7781

Stereo microphone amplifier for camcorders

ROHM Semiconductor 

Video ICs

Stereo microphone amplifier for cam-

corders

BA7781K

The BA7781K allows construction of a stereo-microphone amplifier for camcorder use with a minimum number of

external components. The IC has a built-in wind-noise detection circuit, and wind-noise rejection filter. The filter cir-

cuit is controlled automatically. The IC can operate off a 3.0V power supply.

•Applications

Camcorders

•Features

1) Operates off a 3.0V to 5.25V power supply.

2) Automatic wind-noise rejection circuit.

3) Matrix circuit for stereo emphasis.

4) Automatic switching circuit for external micro-

phones, built-in external monaural decision circuit,

and input switch mode decision circuit.

•Block diagram

24 23 22 21 20 19 18 17

EXT IN L 25 EXT

–

+

BG 26 INT 13dB

15dB

16 DET OUT

15 DET IN

INT IN L 27

GND 28

VREG 29

INT IN R 30

+– MIX

EXT

10dB

EXT

14 BIAS

BIAS

VCC

13 VCC

12 LPF INV OUT

+–

11 LPF INV IN

RIPL 31

INT

13dB

10 MIX OUT

+

EXT IN R 32 EXT

–

15dB

09 MIC MONO

01 02 03 04 05 06 07 08

1

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