BA7797 データシートの表示（PDF） - ROHM Semiconductor

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BA7797

VCR standard audio signal processor

ROHM Semiconductor 

Video ICs

VCR standard audio signal processor

BA7797F

The BA7797F is standard audio signal processor designed for use in VCRs and tape decks. The circuit is comprised

of a playback preamplifier, a line amplifier, a recording amplifier, an ALC circuit and high-voltage head switch.

The IC has a built-in coil equivalent circuit for recording equalization, which eliminates the need for an external com-

ponent.

•Applications

Video cassette recorders and tape decks

•Features

1) Two input switching systems built-in (LINE and TUN-

ER).

2) Built-in coil equivalent circuit for recording equaliza-

tion.

3) High-performance low-noise playback amplifier.

4) ALC level can be adjusted by connection of an

external resistor.

5) Compatible with single-mode EQ making it ideally

suited to widely-used decks.

•Block diagram

PB IN 1

REC HEAD SW 2

REC OUT 3

REC L 4

VCC

5

REC AMP

EQ

0dB

RIPPLE FILTER 6

REC / EE CTRL 7

LINE OUT 8

ALC LEVEL ADJ 9

+ 28dB

LINE

ALC

18 GND

17 PB NFB

16 PB OUT

15 PB LINE IN

14 ALC FILTER

ATT

– 8dB

13

TUNER IN

12 PB / TU / LINE CTRL

ATT

– 8dB

11

LINE IN

10 MUTE CTRL

1

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