BH7272KV Datasheet, PDF (4/14 Pages) Rohm – Two-channel VCR PRE / REC amplifier for Digital VCRs

Video ICs
•^{Measurement circuit (playback system)}
BH7272KV
36 35 34 33 32 31 30 29 28 27 26 25
37
Vcc 4.9V
38
39
40
41
0.1µ
0.1µ
42
43
44
HEAD SW CTRL
45
PB “H”
46
Vcc 4.9V
47
I0adj
48
3rd
2nd
IAMP
IAMP
PRE
DET
AGC
LIMIT
VAMP
BH7272KV
Balance
Balance
BF
Bias
10k 10k
1k 1k
IAMP
IAMP
PRE
24
LIMIT LEVEL adj
23
LIMIT Vth adj
22
21
20
19
Vcc 4.9V
18
REC GATE
17
REC “H”
16
Vcc 3.0V
0.1µ
15
14
Vcc 4.9V
13
I0adj
1
2
3
4
5
6
7
8
9
10 11 12
Fig. 1
4