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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.
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Applications
Video cassette recorders and tape decks
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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.
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Block diagram
LINE
ALC
PB
REC
REC
0dB
EQ
REC AMP
BUFF
MUTE
1
2
3
4
5
6
7
8
9 10
11
12
13
14
15
16
17
18 GND
+ 28dB
VCC
PB IN
REC HEAD SW
REC OUT
REC L
RIPPLE FILTER
REC / EE CTRL
LINE OUT
ALC LEVEL ADJ
PB NFB
PB OUT
PB LINE IN
ALC FILTER
TUNER IN
PB / TU / LINE CTRL
LINE IN
MUTE CTRL
ATT
– 8dB
ATT
– 8dB