bh7273kv ROHM Co. Ltd., bh7273kv Datasheet - Page 2

• Manufacturer Part Number: bh7273kv
• Description: Equalizer And Atf Circuit Ic For Digital Vcrs
• Manufacturer: ROHM Co. Ltd.

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2
Video ICs
Make sure that Vcc and GND do not sway.
Separate the equalizer and ATF grounds.
Since the gain of the ATF circuit is high, make sure that there is no return from the output to input.
Block diagram
Vcc-GND pin table
Pin No.
11
15
16
21
20
25
33
34
44
39
48
47
60
59
64
2
Pin name
V
V
V
V
V
V
V
CC
CC
CC
CC
CC
CC
CC
GND
GND
GND
GND
GND
GND
GND
GND
GND
F1 AMP OUT
F2 AMP OUT
4.9V
4.9V
4.9V
4.9V
4.9V
4.9V
4.9V
F1 BPF OUT
F2 BPF OUT
F2 AMP IN
F1 AMP IN
GCA OUT
GAIN SW
Vcc 4.9V
GAIN adj
ATF IN
F2 adj
F1 adj
GND
GND
N.C.
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
All pass filter for pins 3 to 10
Same as above
12-14pin VCA, 17-19pin AMP
Same as above
22-24pin AMP, 26-28pin BUFF
22-24pin AMP
26-28pin BUFF
35-38pin MIX AMP
35-38pin MIX AMP
Detector, subtractor circuit
Same as above
BPF, 25dBAMP
Same as above
LPF, GCA
Same as above
N.C.
(Connected to GND to lower impedance)
48
1
CTRL
1.5MHz LPF
VCA
47
2
AMP
697.5kHz BPF
14 / 24dB
46
465.0kHz BPF
3
AMP 25dB
45
4
47k 47k
44
5
SUBTRACT
43
6
AMP
42
7
BH7273KV
41
8
40
9
39
10
38
11
37
12
Function
Mix
VCA
BF
36
13
35
14
BF
34
15
AMP
AMP
33
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
N.C.
N.C.
N.C.
N.C.
BF OUT2
BF OUT1
BF IN
GND
TVF2AMP OUT
TVF2AMP – IN
TVF2AMP + IN
Vcc 4.9V
GND
TVF1AMP OUT
TVF1AMP – IN
TVF1AMP + IN
BH7273KV