LA75675M-S datasheet(11/13 Pages) SANYO

Il numero della parte	LA75675M-S

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

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Produttore elettronici	SANYO [Sanyo Semicon Device]

Homepage	https://www.sanyo-av.com/us/

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11 / 13 page

No. 6276-11/13

LA75675M-S

Continued from preceding page.

Pin No.

Function

Equivalent circuit

RF AGC adjustment

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.

21

RF AGC VR

20 k

Ω

20 k

Ω

560

Ω

A12632

21

4.2 V

Bandpass filter output

The output to the external bandpass filter is passed

through an internal 6 dB amplifier before being output.

22

BPF-out

A12633

22

200

Ω

Filter that holds the FM detector output DC voltage

fixed.

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

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.

23

FM filter

1 k

Ω

1 k

Ω

A12634

23

C

+

R

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,

resulting in distortion in the L-R signal and degraded

stereo characteristics. If this problem occurs, add a

resistor between pin 24 and ground.

R1

≥ 5.1 kΩ

• Mono applications

Construct an external deemphasis circuit.

t = CR2

24

FM detector output

R2

300

Ω

10 k

Ω

C

R1

A12635

24

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