LA7565E View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LA7565E

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

SANYO -> Panasonic 

Continued from preceding page.

Pin No.

Pin

LA7565E, 7565KM

Pin function

Equivalent circuit

23 FM filter

Connection for a filter used to hold the FM detector output at

a fixed DC voltage.

Normally, a 1-µF electrolytic capacitor is used. If the low

area (around 50 Hz) frequency characteristics are seen as a

problem, this capacitance should be increased.

The FM detector output level can be reduced and the FM

dynamic range can be increased by inserting a resistor and

a capacitor in series between pin 23 and ground.

1 kΩ 1 kΩ

23

R

C

+

A12069

24 FM detector output

Audio FM detector output.

A resistance of 200 Ω is inserted in series with the emitter

follower.

• In applications that support stereo:

In applications that input to a stereo decoder, the reduced

input impedance can cause distortion in the L-R signal. This

may degrade the stereo characteristics. If this is a problem

add the resistor R1 between pin 24 and ground.

R1 ≥ 5.1 kΩ

C

• In applications that support mono:

Attach an external de-emphasis circuit with the following

time constant.

t = CR2

R2

R1

24

300 Ω

A12070

No. 6100-15/18

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