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STV0042 데이터 시트보기 (PDF) - STMicroelectronics
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STV0042
STV0042/STV0056 APPLICATION NOTE
STMicroelectronics
STV0042 Datasheet PDF : 37 Pages
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STV0042/STV0056 APPLICATION NOTE
3 - APPLICATION NOTES
(continued)
Figure 7 :
FM Demodulation, Video Signal Rejection Filter
C25
TUNER
R18
R17
C23
L4
To FM IN
C24
Figure 8 :
FM Demodulation Block Diagram
FM IN
AGC
AGC R
AMPLK R
LEVEL
DETECTOR 1
LEVEL
DETECTOR 2
Amp.
Detect
SD
AGC L
AMPLK L
V
REF
Reg8 b4
RIGHT DEMODULATOR
LEFT DEMODULATOR
AGC
LEVEL
DETECTOR 1
LEVEL
DETECTOR 2
Amp.
Detect
SD
V
REF
Reg8 b0
AGC STAGE
SW1
Phase
Detect
Bias
FM dev.
Select.
A
V
REF
DET R
AUDIO R
CPUMP R
90
VCO
0
WATCHDOG
R SW5
SYNTHESIZER
L
AUDIO L
SW3
Phase
Detect
Bias
FM dev.
Select.
A
V
REF
SW2
SW4
DET L
CPUMP L
WATCHDOG
90
VCO
0
PLL DEMODULATOR
STV0042/STV0056
8/37
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