LA75520K View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LA75520K

IF Signal Processing (VIF+SIF) IC that Supports the PAL Video Standard for TV Sets and VCRs

SANYO -> Panasonic 

Continued from preceding page.

Pin No.

Pin name

16

IF AGC

LA75520K

Function

IF AGC filter connection pin.

The signal peak-detected by the built-in AGC

detector is converted to the AGC voltage at pin 16.

Additionally, a second AGC filter (a lag-lead filter)

used to create the dual time constants is provided

internally in the IC.

Use a 0.022μF capacitor as the external capacitor

(C1), and adjust the value according to the sag,

AGC speed, and other characteristics.

17

VIF IN2

18

VIF IN1

VIF amplifier input pin

The input circuit is a balanced circuit, and the input

impedance is as follows:

R ≈ 1.0kΩ

19

GND

20

RF AGC VR

RF AGC volume connection pin

This pin sets the tuner RF AGC operating point.

Also, the FM output and the video output can both

be muted at the same time by connecting this pin to

ground.

Equivalent Circuit

5kΩ

1kΩ

1kΩ

16

C1

17

18

21

SIF CARRIER OUT First SIF output pin

This is an emitter-follower output with a 200Ω

resistor attached in series.

22

AUDIO BIAS

FILTER

Connection pin for a filter used to hold the FM

detector output DC voltage fixed. Normally, a 1μF

electrolytic capacitor should be used. The

capacitance (CI) should be increased if the low

band (around 50Hz) frequency characteristics need

to be improved.

300Ω

20

21

200Ω

300Ω 40kΩ

40kΩ

22

+

C1

Continued on next page.

No.A0648-11/12

Share Link: