LA75525AVA View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LA75525AVA

For TV and VCR sets VIF/SIF Signal-Processing IC

SANYO -> Panasonic 

LA75525AVA

Continued from preceding page.

Pin No. Pin name

Function

Equivalent circuit

13 1st SIF INPUT First SIF input. ADC cut capacitor must be used in the input

circuit.

2kΩ

If a SAW filter is used:

The first SIF sensitivity can be increased by inserting an inductor

between the SAW filter and the IC to neutralize the SAW filter

2kΩ

output capacitance and the IC input capacitance.

When used in an intercarrier system:

This pin (pin 13) maybe connect to GND.

20kΩ

100kΩ

12pF

100Ω

30pF

13

RF AGC

OUTPUT

RF AGC OUT PUT. This output controls the tuner RF AGC.

A protective 200Ω resister is inserted in series with the open

collector out put. Determine the external bleeder resister value in

accordance with the specifications of the tuner.

14

200Ω

15 AFT MUTE

LEVEL

The MUTE voltage of AFT is set up this pin. It becomes a voltage

that generated by an external bleeder resistor, when this pin is

connected with GND. It becomes a High voltage (VCC) when this

pin is leaving open.

16 IF AGC INPUT IF AGC filter connection.

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, and other

characteristics.

67Ω

VCC

50kΩ

1kΩ

15

1kΩ

10kΩ

80kΩ

30kΩ

VCC

1kΩ

1kΩ

17 VIF IN 2

18 VIF IN 1

VIF amplifier input.

The input circuit is a balanced circuit, and the input constants are:

R = 1.0kΩ

C = 3pF

19 GND

GND

16

1kΩ

100Ω

1kΩ

100Ω

20kΩ

17 18

Continued on next page.

No.A1256-8/10

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