LA7583 datasheet(7/15 Pages) SANYO

7 / 15 page

Pin Functions

No.

Symbol

Circuit Configuration

Description

FM DETECTOR

OUTPUT

Pin 1 is an audio FM output pin. A 100

Ω

resistor is connected in series with the

emitter follower.

(1)

Monaural applications

CR are used to form a de-emphasis

cicuit externally.

t = CR1

(2)

Audio multiplexing applications

Depending on the audio multiplexing

decoder application, the input

impedance is low, which may distort the

L-R signals, etc., and degrade the

stereo characteristics. In such an event,

add a resistor between pin 1 and GND.

^ 5.1 k

Ω

FM AQT FILTER

GYLATOR

Pin 2 is the FM Automatic Quadrature

Tuning filter pin. This pin controls the

quadrature detector so that it remains at its

center frequency (4.5 MHz), and is the point

where the two control currents are added.

If the value of external capacitor C1 is small,

the low-range frequency characteristics

deteriorate. If the capacitance is too large,

the low-range characteristics improve, but

the response characteristics at SW-ON, etc.,

worsen.

The recommended value for C1 is 10 µF to

33 µF.

RF AGC OUTPUT

Pin 3 is the RF AGC output pin. It is an

emitter output, and a protective resistor of

200

Ω is connected between pin 3 and

emitter.

This pin determines the resistance bleeder

(R1, R2) values according to the maximum

gain of the tuner.

Continued on next page.

LA7583

No.5177-7/15

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