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PDF BA7797F Data sheet ( Hoja de datos )
| Número de pieza | BA7797F | |
| Descripción | VCR standard audio signal processor | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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.
•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
1 page  
Video ICs
•Measurement circuits
PB IN
68k
1
REC HEAD SW
REC OUT
680
2
3
4.7k
1.5k 4
REC AMP
EQ
0dB
VCC
5
REC / EE
CTRL
LINE OUT
4.7k
6
7
8
9
~V BVRHAC
100k
V2
V
BA7797F
+ 28dB
LINE
ALC
18
17
16
15
14
ATT
– 8dB
13
12
ATT
– 8dB
11
10
ON: Gvo PB
+
PB OUT
4.7k
47k 22µ
2.2M
4.7µ 4.7k
PB LINE IN
ON: ALC OFF
4.7k
47k
TUNER IN
PB / TU / LINE CTRL
4.7k
LINE IN
47k
MUTE CTRL
Fig.1
SW2
0.1µ
Units: R [Ω]
C [F]
1 PB IN
2
3 REC OUT
100k
0.1µ
1k
e2
REC head switch AC withstanding voltage measurement circuit
Fig. 2
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BA7797F.PDF ] | |
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