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PDF BH7800K Data sheet ( Hoja de datos )
| Número de pieza | BH7800K | |
| 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
BH7800K
The BH7800K 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 SSB (Synchronized Serial Bus) control
decoder circuit is provided, 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
STEREO, 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: 3.59545MHz, 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°)
Parameter
Symbol
Limits
Unit
VCC 18, 36pin ··························· 6.0
V
Applied voltage
VEE 39pin ······························ – 6.0
VIN 5, 6, 32pin ························ 6.5
V
V
Power dissipation
VIN Pins other than the above ··· 6.0
V
Pd
850∗
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
SCL (5pin) SDA (6pin)
VCC
PB
30k
BH7800K
ENVE OUT / ADJ FLAG / Hi-Fi DET (14pin)
200
VCC
14
VEE
GND
FSC IN (8pin)
VCC
50k
VEE
GND
VCC
5
(6pin)
30k
3V
VEE
MUTE CTRL (32pin)
51k
16k
32
VCC
10k 2k
2.5V
200
50k
10k
VEE
GND
2k
8
100k
50k
100k
VEE
GND
5
5 Page 
Video ICs
BH7800K
•Circuit operation
Function table
The BH7800K includes the following functions on one chip.
No. Block name
Main function
1 Regulator
· ± 5V regulator (VCC, VEE)
· Anti-pop circuit (ANTI—POP)
2 SSB control
· SSB data decoder
3 Input switcher
· TUNER (L, R, M) / LINE 1, 2 (L,R) / BS (L, R) switch
4 Output switcher
6 PNR processor
7 Modulator
8 FM detector control
9 FM BPF
· Line amplifier: + 9.8dB, + 10.8dB, + 12.0dB, + 14.8dB
· STEREO / LEFT / RIGHT / NORMAL switch
· MIX ON / OFF switch
· Mute switch
· MIXER amplifier for RF converter (with ALC function)
· BS / LINE2 through mode
· 20kHz line low-pass filter (secondary LPF)
· 20kHz PNR low-pass filter (secondary LPF)
· PNR processor (MOA, CCA, WTNG, DET)
· Emphasis / de-emphasis (EMPH / DEEMPH)
· Switching noise slope-control type differential compensation circuit
· FM modulation circuit (VCO, DEV)
· FM demodulation / FM BPF MONITOR output switch (FMOUT SW)
: FM MIX1 to 4, FM L, FM R, BPF L, BPF R
· Recording FM treble cutoff filter (FM LPF)
· Over modulation limiter (AUDIO LIM)
· Playback FM limiter (FM LIM)
· VCO, BPF automatic adjustment circuit (AUTO AUDIO ADJUST)
· NTSC / PAL switch function
· Auto adjustment complete FLAG output circuit (ADJ FLAG)
· D.O.detector circuit (D.O. DET)
· Auto FM detector circuit (noise detect method) (FM DET)
: Typ. , + 30%, – 10%
· Envelope detector circuit (ENVE)
· Hold pulse generator
· FM bandpass filter (FM BPF)
· NTSC / PAL switch function
· FM input automatic level adjust circuit (FM ALC: ON / OFF)
Pin numbers
Power supply
35 ~ 39, 42
UNREG—VCC: + 10V
UNREG—VEE: – 10V
GND: 38
5~7
VCC3 (internal power supply)
GND: 7
33, 34,
40, 41
43, 44
1~3
VCC (internally wired)
VEE (internally wired)
GND: 38
27 ~ 30
32
VCC (internally wired)
VEE (internally wired)
GND: 38
9 ~ 12
22 ~ 25
VCC (internally wired)
VEE (internally wired)
GND: 38
8, 14
17, 21
VCC: 18
VEE (internally wired)
GND: 15
14, 20
VCC: 18
(internally wired)
GND: 15
13, 16, 19 VCC: 18
GND: 15
11
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| PDF Descargar | [ Datasheet BH7800K.PDF ] | |
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