No. 6803-8/14

LA7567GM

Pin Descriptions

Pin No.

Pin

Description

Equivalent circuit

1

SIF INPUT

• SIF input. The input impedance is about 1 k

Ω. Since

buzzing and buzz beating can occur if interference enters

this input pin, care must be taken when design the pattern

layout for this pin. Note that the video and chrominance

signals are especially likely to interfere with the audio

signal. Also, the VIF carrier signal can also cause

interference.

1

1k

Ω

1k

Ω

A13680

2

FM power supply filter

• FM detector bias line filter input. Used to improve the FM

detector signal-to-noise ratio.

C1 should be at least 0.47 µF, and 1 µF is recommended.

If the FM detector is not used, connect pin 2 to ground

through a 2-k

Ω resistor. This stops the FM detector VCO.

2

A13681

C1

3.6V

5k

Ω

5k

Ω

18k

Ω

3

4

SIF converter

• Pin 3 is the SIF converter output. The signal is passed

through a 6-MHz bandpass filter and input to the SIF

circuit.

3

4

A13682

A12030

200

Ω

10k

Ω

400

Ω

4(R)

5

and ground.

Continued on next page.