BA7780 データシートの表示（PDF） - ROHM Semiconductor

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BA7780

Stereo zoom microphone amplifier for camcorders

ROHM Semiconductor 

Video ICs

Stereo zoom microphone amplifier

for camcorders

BA7780KV

The BA7780KV is a microphone amplifier developed for use in camcorders. The IC features an electronic volume cir-

cuit for presetting the curve required for the stereo zoom function, a microphone element power supply regulator, a

wind-noise rejection filter, a current limiting circuit for external accessory power supplies, and an input for external

microphone input. The IC operates off a 3.3V power supply.

•Applications

Camcorders

•Features

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

2) Zoom microphone processing function on one chip.

3) Built-in electronic volume for external setting of sen-

sitivity and control voltage.

4) Adjustable microphone element sensitivity.

5) Matrix amplifier for stereo emphasis.

6) Automatic switching circuit for external inputs, and

built-in external monaural decision circuit.

•Absolute maximum ratings (Ta = 25°C)

Parameter

Symbol

Limits

Unit

Power supply voltage

VCC

7.0

V

Power dissipation

Pd

750∗

mW

Operating temperature

Topr

– 10 ~ + 70

°C

Storage temperature

Tstg

– 55 ~ + 125

°C

∗ Reduced by 7.5mW for each increase in Ta of 1°C over 25°C.

•Recommended operating conditions (Ta = 25°C)

Parameter

Symbol Min. Typ. Max.

Unit

Power supply voltage

VCCS

3.0

—

5.25

V

1

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