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PDF BH7801BK Data sheet ( Hoja de datos )
| Número de pieza | BH7801BK | |
| Descripción | Single chip Hi-Fi audio signal processor | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Video ICs
Single chip Hi-Fi audio signal
processor
BH7801BK
The BH7801BK incorporates the functions for a VHS audio signal processing system on a single chip. The circuits
on the chip are a peak-noise reduction processor (PNR), an FM modulator / demodulator circuit, an I / O switcher, an
automatic FM detector circuit, an FM bandpass filter, and a regulator circuit.
•Applications
VCRs
•Features
1) Operates off dual ± power supply which allows a
large reduction in the number of coupling capacitors
required. A built-in regulator makes it easy to con-
struct a power supply system.
2) A two-line I2C BUS control decoder circuit is provid-
ed, allowing the various IC modes to be set using
serial control.
3) A four line input switcher is included (tuner, BS, and
line 1 / 2). The output switcher can switch between
STREO, LEFT, and RIGHT, and Hi-Fi, MIX, and
NORMAL, and a BS MONITOR function is also pro-
vided.
4) The PNR processor and FM modulator / demodula-
tor circuit have reversed characteristics at recording
and playback. In addition, the adjustment for carrier
frequency and FM deviation / playback level are
common.
5) The built-in bandpass filter excels at attenuation of
other channels, and can be directly coupled to the
playback amplifier. The FM recording output block
has a high-performance low-pass filter to produce
sine wave output.
6) Slope-control-type FM-switching-noise compensa-
tion circuit.
7) Envelope detector circuit and noise-detector-type
automatic FM detector circuit.
8) VCO that uses the color signal sub-carrier frequency
fsc (NTSC: 3.579545MHz, PAL: 4.433619MHz) and
auto-adjusting BPF circuit ensure stable adjustment
with no fluctuation due to mounting stress or time.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Applied voltage
Power dissipation
Symbol
VCC
VEE
VIN
VIN
Pd
Limits
18, 36pin······················· 6.0
39pin························· – 6.0
5, 6, 32pin ···················· 6.5
Pins other than the above ···6.0
850∗
Unit
V
V
V
V
mW
Operating temperature
Topr
– 10 ~ + 70
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
∗ Reduced by 8.5mW for each increase in Ta of 1°C over 25°C when mounted on a 70mm × 70mm, t = 1.6mm glass epoxy board.
1
1 page  
Video ICs
AHSWP IN (20pin)
42.5k
5k
20
VCC
PB
30k
SCL (5pin)
VEE
GND
VCC
30k
5
3V
VEE
MUTE CTRL (32pin)
32
VCC
51k 2.5V
10k 2k
200
16k 50k
10k
VEE
GND
BH7801BK
ENVE OUT / ADJ FLAG / Hi-Fi DET (14pin)
VCC
200
SDA (6pin)
14
50k
VEE
GND
VCC
30k
6
90
FSC IN (8pin)
3V
VEE
VCC
2k
8
100k
50k
100k
VEE
GND
5
5 Page 
Video ICs
•Measurement circuit
BH7801BK
LINE2 R IN
4.7k
1k
S33
LINE2 L IN
4.7k
1k
VCC
VCCS
4.7k
VEE
LINE1 R IN
LINE1 L IN
VEES
BS R IN
BS L IN
4.7k
1k
4.7k
1k
4.7k
4.7k
1k
4.7k
1k
34
S34
35
4.7µ
100µ
36
37
38
100µ
S40
S41
39
40
41
42
43
S43
44
S44
TUNER R IN
TUNER L IN
TUNER M IN
1k
1k
1k
S1
S2
S3
VEE
VEE
33 32 31 30 29 28 27 26 25 24 23
MIX
AMP
PNR
REG
OUTPUT
SWITCH
MODEM
D.O.
COM.
FM
OUT
SW
VCO BPF
AUTO
ADJUST
FMBPF
INPUT
SWITCH
ALC
DATA
DECODER
MODEM
ENVE
LOPE
Hi-Fi
DET
PNR
1 2 3 4 5 6 7 8 9 10 11
VEE
100µ
22
0.01µ
21 FM REC OUT
10k
20
0.022µ
19
AHSWP IN
18
27k
17
27k
16
47µ
15
14
47k
13
100µ
12
ENVELOPE
/ Hi-Fi DET
/ AAA FLAG
FM PB IN
Fig.1
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet BH7801BK.PDF ] | |
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