LA1780 データシートの表示（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

53

IF amplifier output

56

IF amplifier input

• Input and output pin or the first

IF amplifier

• Inverting amplifier

V56 = 2 V

Input impedance: RIN = 330 Ω

V53 = 5.3 V

Output impedance

ROUT = 330 Ω

Pin 40 VCC

54

Mixer output: 130 µA

49

Mixer input

The mixer coil connected to the

pin 54 mixer output must be

wired to VCC (pin 40).

The pin 49 mixer input

impedance is 330 Ω

Equivalent circuit

Pin 40 VCC

55

W-AGC IN

AM SD ADJ

58

N-AGC IN

Muting attenuation

adjustment pin

Pins 55 and 58 include built-in

DC cut capacitors.

The AGC on level is determined

by the values of the capacitors

C1 and C2.

Pin 55 functions as the SD

sensitivity adjustment pin in

AM mode.

The output current I55 is 50 µA,

and V55 varies depending on the

value of the external resistor.

The SD function operates by

comparing V55 with the S-meter

voltage.

Pin 62

VCC

Signal meter

Continued on next page.

No. 5724-18/38

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