LA7567N 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA7567N

TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support

SANYO -> Panasonic 

Pin Descriptions

Pin No.

Pin

LA7567N, 7567NM

Description

• SIF input. The input impedance is about 1 kΩ. Since

buzzing and buzz beating can occur if interference enters

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

1

SIF INPUT

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.

Equivalent circuit

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

detector signal-to-noise ratio.

2

FM power supply filter 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-kΩ resistor. This stops the FM detector VCO.

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

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

circuit. There is a 200-Ω resistor in series with the emitter-

follower output.

3

4

SIF converter

• Pin 4 is the SIF converter 500-kHz oscillator connection.

Since this oscillator circuit includes an ALC, the oscillator

level is held fixed at a low level. If this circuit is not used,

connect pin 4 to ground through a 10-kΩ external resistor.

Providing this external resistor stops the 500-kHz oscillator

and allows the converter to be used as an amplifier.

5

VCC

• Use the shortest distance possible when decoupling VCC

and ground.

Continued on next page.

No. 5765-8/14

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