LA75691 データシートの表示（PDF） - SANYO -> Panasonic

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LA75691

IF Signal-Processing IC for PAL/NTSC Multichannel Audio TV and VCR Systems

SANYO -> Panasonic 

Pin Descriptions

Pin No.

Pin

LA75691

Function

Equivalent circuit

SIF input

The input impedance is about 1 kΩ. The pattern layout for

1

SIF INPUT

the input circuit for this pin must be designed carefully, since

buzzing and/or beating can be caused by interference

signals. Video signals, the chrominance signal, and the VIF

carrier signal can cause interference in the audio signal.

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

inserting a filter in the FM detector bias line.

2

FM power supply filter C1 must be at least 0.47 µF, and 1 µF is recommended.

If the FM detector is not used, insert a 2-kΩ resistor between

pin 2 and ground. This stops the FM detector VCO.

Pin 3 is the first SIF output.

3

First SIF output

This is the output pin for the audio carrier to which P/S

separate detection has been applied. This is an emitter-

follower output with a 200 Ω series resistor inserted.

Continued on next page.

No. 5734-7/13

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