bh7779k ROHM Co. Ltd., bh7779k Datasheet - Page 13

• Manufacturer Part Number: bh7779k
• Description: Audio Signal Processing System
• Manufacturer: ROHM Co. Ltd.

Video ICs
1.70MHz insertion loss
1.55MHz attenuation
1.85MHz attenuation
1.30MHz attenuation
1.40MHz insertion loss
1.80MHz attenuation
1.80MHz insertion loss
1.40MHz attenuation
NTSC Rch
PAL Lch
PAL Rch
CLOCK IN
DATA IN
MUTE CTRL
DO detector level
Return delay time
Envelope output level SP0
Envelope output level SP1
Envelope output level SP2
Envelope output level EP1
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 holding voltage
DC MUTE holding voltage
DO detect circuit
FNORM to Hi-Fi return delay circuit
Envelope detect circuit (INPUT: FM PB IN, OUTPUT: ENVE OUT) 0dB = 660mV
Hold pulse circuit
Control system mode holding voltages
Parameter
ATT
Symbol
ATT
ATT
V
V
V
V
V
ATT
ATT
ATT
ATT
ATT
1.55
1.85
1.30
1.80
1.40
V
THHOLD
V
V
V
ENVSP0
ENVSP1
ENVSP2
ENVEP1
V
V
V
FNDLY
DDO
HOLD
H9H
H8H
H6H
H9L
H8L
H6L
NRC
PRC
PLC
NR
NR
NR
PR
PL
– 15.3
– 12.9
– 14.3
ATT
ATT
– 8.8
– 9.5
Min.
2.08
3.70
1.96
110
1.5
0.0
2.5
0.0
2.5
0.0
3.9
—
—
—
—
—
—
NRC
NRC
– 12.3
– 11.3
ATT
ATT
– 5.7
– 4.7
– 9.9
Typ.
2.58
3.95
2.46
7.77
83.0
125
2.9
—
—
—
—
—
—
—
—
—
0
NRC
NRC
– 30.0
– 30.0
– 30.0
ATT
ATT
ATT
ATT
ATT
– 9.3
– 3.4
– 1.4
– 6.9
– 8.3
Max.
3.08
4.20
2.96
140
100
V
V
V
3.9
0.5
0.5
1.0
—
—
CC
CC
CC
NRC
NRC
NRC
PLC
PLC
Unit
dB
mV
dB
dB
dB
dB
dB
dB
dB
dB
ms
V
V
V
V
V
V
V
V
V
V
s
1.30MHz + 1.70MHz
When FM ALC is ON
1.55MHz + 1.30MHz
1.85MHz + 1.30MHz
1.30MHz + 1.70MHz
1.40MHz + 1.80MHz
1.40MHz + 1.80MHz
1.40MHz + 1.80MHz
1.40MHz + 1.80MHz
Input level to give DO due to attenuation.
FM PB IN (1.3MHz, 1.7MHz, 1:1 MIX)
time from 660mV
rise. Audio head pulse in: f = 30Hz, 5V
rectangular waveform.
No signal, SP MODE
V
V
V
Hysteresis (0.5V)
IN
IN
IN
= 0dB, SP MODE
= + 10dB, SP MODE
= – 4dB, EP MODE
P-P
, 1.3MHz & 1.7MHz MIX input
P-P
Conditions
input to ENVE OUT
—
—
—
—
—
—
—
BH7779K
P-P
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