LA1781M(2001) 查看數據表（PDF） - SANYO -> Panasonic

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LA1781M
(Rev.:2001)

Single-Chip Tuner IC for Car Radios

SANYO -> Panasonic 

Pin Descriptions

Pin No.

Function

LA1781M

Description

ANT

Equivalent circuit

VCC

62 pin

RF

AGC

1

Antenna damping drive

An antenna damping current flows

when the RF AGC voltage (pin 2)

reaches VCC – VD.

1000 pF

100 Ω

1

1000 pF

300 Ω

100 Ω

VCC

A11711

2

RF AGC

3

F.E.GND

4

OSC

7

AM OSC

Used to control the FET

second gate.

FET

2ND GATE

+

12 kΩ

2

N

AGC

DET

KEYED

AGC

DAMPING

ANT DRIVER

W

AGC

DET

VCC

A11712

VCC

Oscillator connection

The transistor and capacitors

required for the oscillator circuit

are integrated on the chip.

VT

4

25 pF

2 kΩ

20 pF

A11713

7

VCC

AM first oscillator

This circuit can oscillator up to the

SW band.

An ALC circuit is included.

ALC

A11714

Continued on next page.

No. 6038-6/50

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