BH7800K 데이터 시트보기 (PDF) - ROHM Semiconductor
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BH7800K Datasheet PDF : 13 Pages
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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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