LA1781M Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Lista de partido

LA1781M

For Car Radios Single-Chip Tuner IC

SANYO -> Panasonic 

Continued from preceding page.

Pin No.

Pin function

29

HCC control input

LA1781M

Pin description

The high band frequency output is

controlled by a 0 to 1V input.

It can also be controlled by the MRC

output.

Use a resistor of at least 100kΩ when

controlling with the pin 32 FM S-meter

signal.

Equivalent circuit

VREF

32

29

+

1μF

30

Noise canceller input

31

AM/FM detector output

Pin 30 is the noise canceller input.

The input impedance is 50kΩ.

Pin 31 is the AM and FM detector

output

In FM mode, this is a low-impedance

output.

In AM mode, the output impedance is

10kΩ.

To improve the low band separation,

use a coupling capacitor of over 10μF.

VCC

FM

detector

output

31

10kΩ

VCC

AM

detector

30

Noise

canceller

50kΩ

4.2V

1μF

+

32

IF S-meter output and MRC

FM S-meter output block

DC input

MRC AC input block

Adjust the external 1kΩ resistor to

attenuate the MRC AC input and

control the circuit.

VCC

10kΩ

MRC input

32

+

1μF

1kΩ

Continued on next page.

No.6038-11/48

Share Link: