LA75675M-S 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA75675M-S

VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products

SANYO -> Panasonic 

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Pin No.

Pin

LA75675M-S

Function

Equivalent circuit

4.2 V

RF AGC adjustment

21

RF AGC VR

This pin sets the tuner's RF AGC operating point. Both

the FM output and the video output can be muted by

setting this pin to the ground level.

20 kΩ

20 kΩ

560 Ω

21

A12632

Bandpass filter output

22

BPF-out

The output to the external bandpass filter is passed

through an internal 6 dB amplifier before being output.

200 Ω 22

A12633

Filter that holds the FM detector output DC voltage

fixed.

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

23

FM filter

low band (around 50 Hz) frequency characteristics are

of concern, this value should be increased. The FM

detection output level can be reduced and the FM

dynamic range improved by inserting the resistor R in

series with the capacitor between pin 23 and ground.

1 kΩ 1 kΩ

23

R

C

+

A12634

Audio FM detector output

This is an emitter-follower circuit with a 300 Ω resistor

inserted in series.

• Stereo applications

In some application that provide input to a stereo

decoder, the input impedance may be reduced,

24

FM detector output

resulting in distortion in the L-R signal and degraded

R2

24

stereo characteristics. If this problem occurs, add a

300 Ω

resistor between pin 24 and ground.

R1 ≥ 5.1 kΩ

C

R1

10 kΩ

• Mono applications

Construct an external deemphasis circuit.

t = CR2

A12635

No. 6276-11/13

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