LA7567EV Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LA7567EV

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

SANYO -> Panasonic 

Pin Functions

Pin No.

Pin

LA7567EV

Description

Equivalent circuit

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

4.2V

• 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 0.47µF, and 1µF is recommended.

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

through a 2kΩ resistor. This stops the FM detector VCO.

1

1kΩ

1kΩ

ILA06689

2

C1

TO VCO BIAS

ILA06690

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

through a 6MHz bandpass filter and input to the SIF circuit.

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

output.

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

3

4

SIF converter

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 10kΩ external resistor.

Providing this external resistor stops the 500kHz oscillator

and allows the converter to be used as an amplifier.

• When this circuit is used with an intercarrier, the buzz

characteristics can be improved by changing the value of

the resistor connected between pin 4and ground to 100kΩ.

200Ω

3

ILA06713

500kHz

4

400Ω

4(R)

5

VCC

• Use the shortest distance possible when decoupling VCC

and ground.

ILA06691

Continued on next page.

No.7779-15/21

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