bh7802k ROHM Co. Ltd., bh7802k Datasheet - Page 12

• Manufacturer Part Number: bh7802k
• Description: Single Chip Hi-fi Audio Signal Processor
• Manufacturer: ROHM Co. Ltd.

•
Function table
The BH7802K includes the following functions on one chip.
12
No.
Video ICs
Circuit operation
1
2
3
4
6
7
8
9
Regulator
I
Input switcher
Output switcher
PNR processor
Modulator
FM detector control
FM BPF
2
C BUS control
Block name
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: FM MIX1 to 4, FM L, FM R, BPF L, BPF R
: Typ, + 10%, – 10%
Anti-pop circuit (ANTI-POP)
I
TUNER (L, R, M) / LINE 1, 2 (L,R) / BS (L, R) switch
Line amplifier: + 9.8dB, + 10.3dB, + 11.3dB, + 15.0dB
STEREO / LEFT / RIGHT / 9 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)
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)
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)
2
C BUS data decoder
5V regulator (V
CC,
V
EE
)
Main function
Pin number
35 ~ 39, 42
13, 16, 19
27 ~ 30
22 ~ 25
33, 34,
40, 41
43, 44
9 ~ 12
17, 21
14, 20
1 ~ 3
5 ~ 7
8, 14
32
UNREG-V
UNREG-V
GND: 38
V
GND: 7
V
V
GND: 38
V
V
GND: 38
V
V
GND: 38
V
V
GND: 15
V
(internally wired)
GND: 15
V
GND: 15
CC3
CC
EE
CC
EE
CC
EE
CC
EE
CC
CC
: 18
: 18
: 18
(internally wired)
(internally wired)
(internally wired)
(internally wired)
(internally wired)
(internally wired)
(internally wired)
(internal power supply)
Power supply
CC
EE
BH7802K
: – 10V
: + 10V