LA1787M データシートの表示（PDF） - SANYO -> Panasonic

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LA1787M

Single-Chip Tuner IC for Car Radios

SANYO -> Panasonic 

Continued from preceding page.

Pin No.

Function

44

IF AGC

45

IF output

LA1787M

Description

G1; Used for time constant

switching during seeks.

• Reception

τ = 2.2 µF × 300 kΩ

• Seek

τ = 2.2 µF × 10 Ω

The external capacitors are

connected to VCC.

This is because the IF amplifier

operates referenced to VCC.

Equivalent circuit

0.022µF

+

240kΩ

VCC

C

2.2µF

42

44

VCC

DET

50kΩ

G1

SEEK

ON

10Ω

50kΩ

IF

AGC

Pin 40 VCC

A13583

The IF amplifier load

45

Pin 40 VCC

AM antenna damping

46

drive output

Wide band AGC input

I46 = 6 mA (maximum)

This is the antenna damping

current.

DET

VCC

50pF

46

100Ω

A13584

20kΩ

VCC

W.AGC AMP.

ANT DAMPING

DRIVER

A13585

Continued on next page.

No. 6655-15/54

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