LA72912V Datasheet, PDF (6/12 Pages) Sanyo Semicon Device – FM Modulator and Demodulator IC

LA72912V
Block Diagram and Application Circuit Exanple1 Modulation (Outside camera)
Video-IN
A-GND
Emphasis
Monitor
Outside camera SW
2nd-call : Lo
ASK-RX IN
ASK-AGC
Filter
Standby SW
(OFF : 4.5V)
(Lo : FM-OFF)
D-GND
(Hi : FM-ON) _LPF
ASK-RX
Filter
ASK-RX OUT
(Hi : CAR having)
VDD
*1
*1
24 23 22 21 20 19 18 17 16 15 14 13
Clamp
-6dB
Main De-Emph
FM-DEMOD/LPF
FM-AGC-DET _Doc-DET
(Doc-LO)
D-LIM
FM-AGC(ON/OFF)
Standby
Control
ASK-AGC DET
LPF
ASK-AGC/ASK-RX
/Comparator
Main
Emphasis
FM-MOD
LPF
LPF MOD/DEMOD
Control
12dB-AMP
Video-Mute
FM-stop
FM-Stop,Polarity
E(VD) & A(SW)
ASK-TX
/Modulator
REG
FF
Amp(ON/OFF)
A-VCC
TC1 TC2 ASK-VCC
1
2 _*2 3
4
5
6
7
8
9
10
11
12 _*2
VCC(5V)
FM-OUT
VD-IN MOD : Hi
VD : Hi DEMOD : Lo
→ 5V
VCC(5V)
ASK-DATA IN ^BPF
(Hi : CAR-OFF)
ASK-CAR IN
ASK-TX OUT
*1: Open collector Output
*2: Push-Pull Output
Application Circuit Exanple2 Demodulation (Inside monitor)
A-GND
FM-AGC OFF
(OFF : 4.5V)
DOC-OUT
ASK-RX IN
ASK-AGC
Filter
ASK-RX
Filter
ASK-RX OUT
(Hi : CAR having)
Standby SW
(OFF : 4.5V)
VDD
(Lo : FM-OFF)
D-GND
(Hi : FM-ON) _LPF
*1
*1
24 23 22 21 20 19 18 17 16 15 14 13
Clamp
-6dB
Main De-Emph
FM-DEMOD/LPF
FM-AGC-DET _Doc-DET
D-LIM
(Doc-LO)
FM-AGC(ON/OFF)
Standby
Control
ASK-AGC DET
LPF
ASK-AGC/ASK-RX
/Comparator
Main
Emphasis
FM-MOD
LPF
LPF MOD/DEMOD
Control
12dB-AMP
Video-Mute
FM-stop
FM-Stop,Polarity
E(VD) & A(SW)
ASK-TX
/Modulator
REG
FF
Amp(ON/OFF)
A-VCC
TC1 TC2 ASK-VCC
1
2 _*2 3
4
5
6
7
8
9
10
11
12 _*2
VCC(5V)
Video-OUT
MOD : Hi
DEMOD : Lo
VCC(5V)
FM-IN ^{→ GND} FM-OUT (FM-OUT)
ASK-DATA IN ^BPF
(Hi : CAR-OFF)
Control
ASK-CAR IN
ASK-TX OUT
(ON/OFF)
*1: Open collector Output
*2: Push-Pull Output
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