bh7775k ROHM Co. Ltd., bh7775k Datasheet - Page 4

• Manufacturer Part Number: bh7775k
• Description: Vcr Audio Signal Processing System
• Manufacturer: ROHM Co. Ltd.

•
Pin function - 1 / 2
4
Note) I / O circuit; EF: emitter follower, P-P: push pull, B: base, and C: collector.
Video ICs
Pin descriptions
Pin No.
4, 3, 5
11, 38
12, 37
13, 36
14, 35
15, 34
16, 33
17, 32
18, 31
19, 30
20, 29
2, 1
All numerical values are standardized values.
10
21
22
23
24
25
26
27
28
6
7
8
9
VCO DAC BF OUT L, R
ENVE OUT / Hi-Fi DET
TUNER IN L, R, M
GND (GNM) L, R
VCO f
NR EMPH L, R
Hi-Fi OUT L, R
FM REC OUT
WTNG1 L, R
WTNG2 L, R
MUTE CTRL
Hi-Fi IN L, R
/ ADJ FLAG
NR TC L, R
DC FB L, R
BPF f
RHS CTRL
AHSWP IN
BS IN L, R
CLOCK IN
FM PB IN
Pin name
DATA IN
FM ALC
FSC IN
GNDD
VCB
0
ADJ L, R
0
ADJ
BS input (L and R).
TUNER input (L, R, and M).
Serial control GND.
Serial control data input.
Serial control clock input.
FM input Lch signal component envelope output.
Hi - Fi DET output for FM input. ADJ FLAG output for ADJ.
fsc input terminal for VCO and BPF adjustment.
Hi - Fi input for output switcher.
PNR audio output.
PNR attack and recovery time setting. Attack
R: 530 , recovery R: 6.5k .
Waiting characteristic low-frequency time constant setting
Waiting characteristic high-frequency time constant setting
NR emphasis time constant setting.
(external C = 0.01 F)
PNR operating reference potential.
VCO control current setting terminal.
VCO control DAC voltage output terminal .
PNR, MODEM and BPF GND. L and R unconnected.
Playback FM input. 660mV
No input coupling capacitor (GND to V
Line output mute control input.
MODEM and BPF V
FM BPF center frequency adjustment.
FM ALC time constant setting.
High-voltage head switch (BA7755) control terminal.
Audio head switching pulse input.
EE: recording FM output. Sine wave output.
PB: BPF output monitor terminal.
CC
.
Function
P-P
Typ.
CC
).
Pin voltage
EE: 0.8V
PB: 1.0V
EE: 3.3V
PB: 3.3V
– 5.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
2.5V
1.4V
0.0V
0.0V
5.0V
1.9V
0.0V
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PB, ADJ: EF (NPN)
EF (NPN) ~ 2.5k
EF (NPN) ~ 200
EF (NPN) ~ 200
3k
BH7775K
EF (NPN)
EF (NPN)
I / O circuit
EE: 50k
EF: (P-P)
B (PNP)
B (PNP)
C (NPN)
B (PNP)
69.8k
47.0k
11.5k
200k
1.1k
47k
10k
50k
2.5V Min.)
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