BH7775K Datasheet, PDF (5/17 Pages) Rohm – VCR audio signal processing system

Video ICs
Pin function - 2 / 2
Pin No.
39
Pin name
NA FB
40
NA ALC
41
NA PB IN
42
NA PB OUT
43
PB EQ
44
NA PB NFB
45
GNN
Function
Normal line amplifier feedback.
Normal line amplifier ALC time constant setting
(attack and recovery time).
Normal line amplifier playback input.
Normal PB amplifier output.
Normal PB amplifier equalizer switch.
Normal PB amplifier feedback.
Normal audio GND.
46
NA HEAD IN
Normal audio playback input.
47
HEAD EQ
Head resonance equalizer switch terminal.
48
NA REC OUT
Normal REC amplifier output.
49
REC EQ
Recording equalizer setting resistor terminal.
50
NA REC FB
Normal REC amplifier feedback terminal.
51
MIX ALC
ALC time constant setting for mixer amplifier
(attack and recovery time).
52
MIX OUT
Mixer amplifier output for RF converter.
54, 53
LINE OUT L, R
Line output
55
VCC
VCC regulator.
56
ERP
VCC regulator error output.
57
GND
Output switch, regulator GND.
58
ERM
VEE regulator error output.
59
VEE
VEE regulator
61, 60
LINE1 IN L, R
LINE 1 input (L and R).
63, 61
LINE2 IN L, R
LINE 2 input (L and R).
64
VREFP
VCC / 2 reference voltage. With power on detect
and precharge function.
∗ I / O circuit; EF: emitter follower, P-P: push pull, B: base, and C: collector.
All numerical values are standardized values.
BH7775K
Pin voltage
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
– 5.0V
0.0V
0.0V
5.0V
5.0V
0.0V
– 5.0V
– 5.0V
0.0V
0.0V
2.5V
I / O circuit
800Ω
EF (NPN) ~ 500Ω
105.2kΩ
EF (P-P) ~ 50Ω
OPEN / 25Ω
B (NPN)
—
REC: B (NPN)
REC: EF (P-P)
300kΩ / 29Ω
EF: (P-P)
1kΩ
B (NPN)
EF (NPN) ~ 500Ω
EF (NPN)
330Ω
—
C (NPN)
—
C (PNP)
—
90.2kΩ
90.2kΩ
10kΩ
5