BA7797F Datasheet, PDF (1/8 Pages) Rohm – VCR standard audio signal processor

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