AN7280S データシートの表示（PDF） - Panasonic Corporation

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AN7280S

FM Front-end IC for Car Radio

Panasonic Corporation 

ICs for FM/AM Tuner

AN7280S

s Operational Description

• Loop AGC

The AN7280S uses 2Loop AGC for AGC circuit. 2Loop AGC controls AGC output by using mixer output (IFT first side)

signal and FM–IF control voltage (level meter output), which is a very favorable system for disturbance characteristics,

etc.

IFT

RF–Amp.

Mixer

IF–Amp.

FM–IF

To N.C.

Control Voltage Output

AGC

Amp.

AGC

Det.

• AGC start point (Mixer input level at VAGC < 3V) changes in proportion to Pin6 external resistance (following R1) , Pin

7 applied voltage (Determine IF control voltage by R2, R3 resistance division) SSC ON/OFF

· Variable width at R 1 28dB (however, V7 ≥3V, V9 = 0V)

· Variable width at R7 40dB (however, R1= ∞, V9= 0V)

· Variable width at R9 10dB (however, R1= ∞, V7 ≥3V)

VREF

3

AGC Output AGC–Adj Vcont IN

5

6

7

R2

SSC IN

9

about 4.7V

VAGC

R1

R3

from microcomputer

FM–IF

Control voltage

• SSC

Change AGC start point by microcomputer control signal at seek/reception time.

Use at SSC ON ········V9 > 3.5V

Use at SSC OFF········V9 < 1.5V

* SSC is designed as precondition for switching operation at microcomputer control signal.

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