LA75676V-S Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA75676V-S

VIF/SIF IF Signal-Processing Circuit for TV and VCR Products

SANYO -> Panasonic 

Pin Functions

Pin No.

Pin

LA75676V-S

Function

Equivalent circuit

SIF input

The input impedance is about 1 kΩ.

Since interference signals* entering this input can

result in buzzing and beat signals, the pattern layout

1

SIF input

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.

1kΩ

1kΩ

1

A13269

4.2V

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

2

FM power supply filter 1 µF.

If the FM detector is not used, a 2 kΩ resistor must be

inserted between pin 2 and ground. This stops the FM

detector VCO circuit.

10kΩ

4kΩ

2

C1

TO VCO BIAS

14kΩ

A13270

Outputs the intercarrier detector output that has been

3

SIF out

passed through a high-pass filter.

(4.5 MHz output)

4

NC

This pin should be left open.

5

VCC

Use lines that are as short as possible for VCC/ground

decoupling.

200Ω

3

A13271

Continued on next page.

No. 6277-7/13

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