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參數(shù)資料
| 型號(hào)： | BH7800K |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Single chip Hi-Fi audio signal processor |
| 中文描述： | 單芯片Hi - Fi音頻信號(hào)處理器 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大小： | 174K |
| 代理商： | BH7800K |
11
Video ICs
BH7800K
Circuit operation
Function table
The BH7800K includes the following functions on one chip.
Block name
Main function
Power supply
Pin numbers
No.
Regulator
35 ~ 39, 42
1
SSB control
· SSB data decoder
5 ~ 7
2
UNREG—V
CC
: + 10V
UNREG—V
EE
: – 10V
GND: 38
V
CC
(internally wired)
V
EE
(internally wired)
GND: 38
·
±
5V regulator (V
CC,
V
EE
)
· Anti-pop circuit (ANTI—POP)
FM BPF
13, 16, 19
9
· FM bandpass filter (FM BPF)
· NTSC / PAL switch function
· FM input automatic level adjust circuit (FM ALC: ON / OFF)
V
CC
: 18
GND: 15
· TUNER (L, R, M) / LINE 1, 2 (L,R) / BS (L, R) switch
V
CC3
(internal power supply)
GND: 7
27 ~ 30
32
Input switcher
33, 34,
40, 41
43, 44
1 ~ 3
3
V
CC
(internally wired)
V
EE
(internally wired)
GND: 38
· 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)
Output switcher
4
9 ~ 12
22 ~ 25
V
CC
(internally wired)
V
EE
(internally wired)
GND: 38
PNR processor
6
: Typ. , + 30%, – 10%
· Envelope detector circuit (ENVE)
· Hold pulse generator
V
CC
: 18
(internally wired)
GND: 15
FM detector control
14, 20
8
8, 14
17, 21
V
CC
: 18
V
EE
(internally wired)
GND: 15
Modulator
7
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