LA72910V

No.A0783-7/10

Pin Description

Pin No.

Pin Name

Description

Equivalent circuit

1

Emphasis filter

Main Emphasis filter pin.

Before FM Modulation, make emphasis characteristic at

video signal.

Emphasis time constant must be matching at

de-emphasis time constant.

(If you don’t need the emphasis, this pin is open.)

2.7k

Ω

620

Ω

1

R1

C1

2

VCC5V

VCC pin. Supply voltage is 5V DC.

Please connect de-coupling capacitor.

3

Main_OUT

Push-Pull output pin.

MOD mode: FM carrier output. (1.8Vp-p: Rout=200

Ω)

DEMOD mode: Video signal output. (2.0Vp-p: Rout=1k

Ω)

3

MOD

DEMOD

4

Regulator filter

Internal regulator filter pin.

Please connect 0.1

µF (C1)

4

C1

5

VD_IN/FM_IN

DEMOD mode: FM signal input. Internal DC

bias is 3.3V. Please use capacitor (C1) coupling.

MOD mode: VD signal input. Please input VD signal

directory.

Please consider input impedance.

5

FM Sig

200

Ω

1k

Ω

C1

VD Sig

6

Mode control

MOD mode/ DEMOD mode setting pin.

MOD mode: Please set over 2V DC voltage. (2 to 5V).

DEMOD mode: Please set under 0.4V DC voltage.

(0 to 0.4V).

6

1k

Ω

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