bh7775k ROHM Co. Ltd., bh7775k Datasheet - Page 14

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

14
Video ICs
[DO detect circuit]
[FNORM to Hi-Fi return delay circuit]
[Envelope output circuit] (INPUT: FM PB IN, OUTPUT: ENVE OUT)
[Hold pulse circuit]
[Voltage for preserving the control system mode]
CLOCK IN
DATA IN
DO detector level
Return delay time
Envelope output level SP0
Envelope output level SP1
Envelope output level SP2
Envelope output level EP1
Hi-Fi DET output DC FNORMAL
Hi-Fi DET output DC HiFi
Audio head switch pulse
threshold voltage
Hold pulse width
L mode holding voltage
H mode holding voltage
L mode holding voltage
H mode holding voltage
MUTE CTRL
MUTE holding voltage
DC MUTE holding voltage
Parameter
0dB = 660mV
Symbol
V
V
V
V
V
V
V
V
V
V
THHOLD
V
V
ENVSP0
ENVSP1
ENVSP2
ENVEP1
V
V
FNDLY
HDETH
HDETL
H22H
H22L
DDO
HOLD
H8H
H7H
H7L
H8L
P-P
, 1.3MHz & 1.7MHz MIX IN
2.22
3.70
2.18
3.50
1.66
6.47
Min.
77.0
110
0.0
2.5
0.0
2.5
0.0
3.9
—
—
Typ.
83.0
2.72
3.95
2.68
4.00
2.66
7.77
125
—
—
—
—
—
—
0
0
Max.
3.22
4.20
3.18
3.66
9.07
89.0
140
100
100
V
V
V
0.5
0.5
1.0
—
CC
CC
CC
Unit
dB
mV
mV
ms
V
V
V
V
V
V
V
V
V
V
V
s
FM PB IN (1.3MHz, 1.7MHz, 1: 1 MIX)
time from 660mV
rise. Audio head pulse in: f = 30Hz,
5V
No signal, SP MODE
V
V
V
No signal
V
Hysteresis (0.5V)
Input level to give DO due to attenuation.
IN
IN
IN
IN
P-P
= 0dB, SP MODE
= + 10dB, SP MODE
= – 4dB, EP MODE
= 0dB
rectangular waveform.
Conditions
P-P
input to ENVE OUT
BH7775K