LA72912V

No.A1409-6/12

Block Diagram and Application Circuit Exanple1 Modulation (Outside camera)

1

2

3

4

5

7

8

REG

VD-IN

VD : Hi

FM-OUT

VCC(5V)

FM-stop

12dB-AMP

Video-Mute

Main

Emphasis

-6dB

Clamp

MOD/DEMOD

Control

9

FM-AGC(ON/OFF)

D-LIM

FM-MOD

LPF

FM-AGC-DET

Main De-Emph

24

23

22

21

20

17

MOD : Hi

DEMOD : Lo

→ 5V

Doc-DET

(Doc-LO)

Standby

Control

A-GND

A-VCC

Video-IN

FM-DEMOD/LPF

19

18

LPF

6

FF

10

11

12

16

15

14

13

LPF

ASK-AGC DET

ASK-AGC/ASK-RX

/Comparator

D-GND

LPF

VCC(5V)

ASK-VCC

FM-Stop,Polarity

E(VD) & A(SW)

TC1

TC2

Amp(ON/OFF)

ASK-TX

/Modulator

BPF

ASK-DATA IN

(Hi : CAR-OFF)

ASK-CAR IN

ASK-TX OUT

Standby SW

(Lo : FM-OFF)

(Hi : FM-ON)

ASK-RX IN

ASK-AGC

Filter

(OFF : 4.5V)

ASK-RX

Filter

ASK-RX OUT

(Hi : CAR having)

VDD

Emphasis

Monitor

*2

*2

*1

*1

*1: Open collector Output

*2: Push-Pull Output

Outside camera SW

2nd-call : Lo

Application Circuit Exanple2 Demodulation (Inside monitor)

1

2

3

4

5

7

8

REG

FM-IN

Video-OUT

VCC(5V)

FM-stop

12dB-AMP

Video-Mute

Main

Emphasis

-6dB

Clamp

MOD/DEMOD

Control

9

FM-AGC(ON/OFF)

D-LIM

FM-MOD

LPF

FM-AGC-DET

Main De-Emph

24

23

22

21

20

17

MOD : Hi

DEMOD : Lo

→ GND

Doc-DET

(Doc-LO)

Standby

Control

A-GND

A-VCC

FM-DEMOD/LPF

19

18

LPF

6

FF

10

11

12

16

15

14

13

LPF

ASK-AGC DET

ASK-AGC/ASK-RX

/Comparator

D-GND

LPF

VCC(5V)

ASK-VCC

FM-Stop,Polarity

E(VD) & A(SW)

TC1

TC2

Amp(ON/OFF)

ASK-TX

/Modulator

BPF

ASK-DATA IN

(Hi : CAR-OFF)

ASK-CAR IN

ASK-TX OUT

Standby SW

(Lo : FM-OFF)

(Hi : FM-ON)

ASK-RX IN

ASK-AGC

Filter

(OFF : 4.5V)

ASK-RX

Filter

ASK-RX OUT

(Hi : CAR having)

VDD

*2

*2

*1

*1

*1: Open collector Output

*2: Push-Pull Output

FM-AGC OFF

(OFF : 4.5V)

DOC-OUT

FM-OUT

Control

(ON/OFF)

(FM-OUT)