LA1780 查看數據表（PDF） - SANYO -> Panasonic

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LA1780

Single-Chip Tuner IC for Car Radios

SANYO -> Panasonic 

Continued from preceding page.

Pin No.

Function

LA1780M

Description

41

HCC capacitor

The HCC frequency characteristics

are determined by the external

capacitor connected at this pin.

42

AM L.C. pin

This pin is used to change the

frequency characteristics of the

unneeded audio band under

100 Hz in AM mode to produce

a clear audio signal.

Note: The LC capacitor must be

connected between this pin

and VCC (pin 40).

This is because the detector

circuit operates referenced

to VCC.

The cutoff frequency fC is

determined by the following

formula.

fC = 1/2π × 50 k × C

Equivalent circuit

43

Pilot detector

Inserting a 1-MΩ resistor between

pin 43 and VCC will force the IC

to mono mode.

Continued on next page.

No. 5724-15/38

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