LA75521VA Просмотр технического описания (PDF) - SANYO -> Panasonic

Номер в каталоге

Компоненты Описание

производитель

LA75521VA

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

SANYO -> Panasonic 

LA75521VA

Continued from preceding page.

Pin

Pin name

No.

Function

7

SIF SYSTEM SW A SIF system selection switch pins. Combining the

9

SIF SYSTEM SW B settings of these two pins supports four systems.

In M/N mode, the audio output level is increased

by 6dB.

The internal trap is also linked to these switches.

The truth-values are as follows.

Pin 7

Pin 9

MODE

H

H

M

H

L

I

L

H

B/G

L

L

D/K

8

APC FILTER

PLL APC filter connection pin. The APC count is

switched internally in the IC.

The VCO is normally controlled by route A.

When unlocked and during weak field reception,

the VCO is controlled by route B and the loop gain

is increased.

For this APC filter we recommend a resistor of 51Ω

and capacitor of 0.47μF.

The buzz characteristics can be improved by

connecting a capacitor of 100pF or so between

pins 5 and 8.

10

VIF FREQUENCY SW Switch pin for selecting the IF frequency

When this pin is open, 1/2VCC exists.

VCC: 39.5MHz

Open: 38.9MHz

GND: 38.0MHz

Equivalent Circuit

A7

50kΩ

1kΩ

B9

1kΩ

80kΩ

30kΩ

50kΩ

1kΩ

1kΩ

80kΩ

30kΩ

FROM

APC

A DET

1kΩ 1kΩ

B

8

50kΩ

10

11kΩ

50kΩ

11

REFERENCE CP Reference signal input pin necessary for adjusting

INPUT

the internal sound carrier trap, AFT, etc.

Either 4.0 or 4.43MHz can be selected. Use the

configuration shown in example 1 when using

4.43MHz and configuration shown in example 2

when using 4.0MHz.

Since no oscillator can be configured simply by

connecting the X’tal resonator to pin 11, input the

reference signal from an external source without

fail.

Example 1

11

Example 2

11

1000pF

4.43M

1000pF

4.0MHz

270kΩ

200kΩ

11

Continued on next page.

No.A1004-9/13

Share Link: