BH7801BK View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
Manufacturer
BH7801BK Datasheet PDF : 14 Pages
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Video ICs
BH7801BK
•Circuit operation
Function table
The BH7801BK includes the following functions on one chip.
No.
Block name
1 Regulator
2 I2C BUS control
3 Input switcher
4 Output switcher
6 PNR processor
7 Modulator
8 FM detector control
9 FM BPF
Main function
Pin numbers
Power supply
· ± 5V regulator (VCC, VEE)
· Anti-pop circuit (ANTI-POP)
UNRE-VCC: + 10V
35 ~ 39, 42 UNREG-VEE: – 10V
GND: 38
· I2C BUS data decoder
5~7
VCC3 (internal power supply)
GND: 7
· TUNER (L, R, M) / LINE 1, 2 (L,R) / BS (L, R) switch
33, 34,
40, 41
43, 44
1~3
VCC (internally wired)
VEE (internally wired)
GND: 38
· Line amplifier: + 9.8dB, + 10.3dB, + 11.3dB, + 14.0dB
· STEREO / LEFT / RIGHT / NORMAL switch
· MIX ON / OFF switch
· Mute switch
· MIXER amplifier for RF converter (with ALC function)
· BS / LINE2 through mode
27 ~ 30
32
VCC (internally wired)
VEE (internally wired)
GND: 38
· 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
9 ~ 12
22 ~ 25
VCC (internally wired)
VEE (internally wired)
GND: 38
· 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 filte (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)
8, 14
17, 21
VCC: 18
VEE (internally wired)
GND: 15
· D.O.detector circuit (D.O. DET)
· Auto FM detector circuit (noise detect method) (FM DET)
: Typ. + 10%, – 10%
· Envelope detector circuit (ENVE)
· Hold pulse generator
14, 20
VCC: 8
(internally wired)
GND: 15
· FM bandpass filter (FM BPF)
· NTSC / PAL switch function
· FM input automatic level adjust circuit (FM ALC: ON / OFF)
13, 16, 19 VCC: 18
GND: 15
12
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