AN7243 データシートの表示（PDF） - Panasonic Corporation

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AN7243

ICs for FM/AM Tuner

Panasonic Corporation 

ICs for FM/AM Tuner

s Pin Descriptions (Cont.)

Pin No.

Pin Name

Typ. Waveform

7.2V

12 PIN Diode

Driver Output

.0V

Description

Drive PIN diode for input attenuate

of RF-Amp.

Determine drive current by Pin12

external resistance.

13 Mix.Output

RF

Input signal from RF Amp.

AN7243S

Equivalent Circuit

VCC

12

2.2kΩ

2.2kΩ

13

14 GND

Main circuit GND

Note) Typical waveform frequency is the value when tuning receiving frequency 98.0 MHz.

s Supplementary Explanation

• AGC

AGC used at the AN7243S uses mixer output (IFT primary side) signal and controls AGC output.

RF

Amp.

Mixer

IFT

IF – Amp.

–

12

+

AGC

Amp.

6

AGC

Det.

RAdj. (SAGC variable)

V5, V12 –VIN (RF)

VCC= 8V

8

7

SAGC

6

5

Variable

4

V5

3

2

V12

1

0

VIN (RF) (dBµ)

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