No. 6277-7/13

LA75676V-S

Pin Functions

Pin No.

Pin

Function

Equivalent circuit

SIF input

The input impedance is about 1 k

Ω.

Since interference signals* entering this input can

result in buzzing and beat signals, the pattern layout

for the signal input to this pin must be designed

carefully.

*: Signals that can interfere with audio include video

and chrominance signals. Thus the VIF carrier

signal can cause interference.

1

SIF input

1

1k

Ω

1k

Ω

A13269

The FM detector signal-to-noise ratio can be improved

by inserting a filter in the FM detector bias line.

C1 must be 0.47 µF or higher, and we recommend

1 µF.

If the FM detector is not used, a 2 k

Ω resistor must be

inserted between pin 2 and ground. This stops the FM

detector VCO circuit.

2

FM power supply filter

2

A13270

C1

TO VCO BIAS

4.2V

10k

Ω

4k

Ω

14k

Ω

Outputs the intercarrier detector output that has been

passed through a high-pass filter.

(4.5 MHz output)

3

SIF out

A13271

3

200

Ω

This pin should be left open.

4

NC

decoupling.

5

Continued on next page.