LA7565KM 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA7565KM

IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products

SANYO -> Panasonic 

Pin Functions

Pin No.

Pin

LA7565E, 7565KM

Pin function

Equivalent circuit

1 SIF INPUT

The input impedance is about 1 kΩ. If interference signals

enter via this pin, those signals may cause buzz and buzz

beat noise. (Here, signals such as video signals or

chrominance signals are the main audio interference

signals. The VIF carrier signal may also appear as

interference.) The application printed circuit board pattern

layout should be designed carefully to prevent interference

from entering at this pin.

1 kΩ

1 kΩ

1

A12052

4.2V

2 FM power supply filter

The FM S/N ratio can be improved by inserting a filter in the

FM detector bias line.

The capacitor C1 should have a value of 0.47 µF or greater,

and 1 µF is recommended.

A 2-kΩ resistor must be inserted between pin 2 and ground

if the FM detector is not used. This stops the FM detector

VCO.

2

C1

TO VCO BIAS

A12053

3

4

SIF converter

Pin 3 is the SIF converter output.

This signal is passed through a 6-MHz band-pass filter and

input to the SIF circuit. A 200-Ω resistor is inserted in series

with the emitter-follower output.

Pin 4 is the SIF converter 500-kHz oscillator pin.

Since the oscillator circuit includes an ALC circuit, the

oscillator level is controlled at a fixed, relatively low level. An

external 10-kΩ resistor must be inserted between pin 3 and

ground if this circuit is not used. Attaching this external

resistor stops the 500-kHz oscillator and the converter can

be used as an amplifier.

3

200 Ω

A12054

500 kHz

68 Ω

4

400 Ω

400 Ω

A12055

Continued on next page.

No. 6100-10/18

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