LA1140 データシートの表示（PDF） - SANYO -> Panasonic

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LA1140

FM IF System for Car Radio

SANYO -> Panasonic 

Equivalent Circuit Block Diagram

LA1140

AC Test Circuit

Signal

strength

Ind.

T1: CBTKAC-24782 AUO (Toko Co.)

T2: CBTKAE-24783X (Toko Co.)

22µH: S-220J (Korin Co.)

Input signal strength is an actual input at pin 1

Unit (resistance: Ω, capacitance: F)

Muting Characteristic

The muting operation in the LA1140 is performed by an AF preamplifier, the gain of which varies continuously with control

current, and a muting drive output circuit which supplies the control current.

The gain of the AF preamplifier decreases with increasing gain control current applied to pin 6. However, the gain does not

decrease further when the control current reaches approximately 120 µA or greater. The lower limit of the gain under this

condition depends upon a resistor connected between pin 5 and GND, and the higher the resistance the lower the gain (the higher

the attenuation). Thus the maximum muting attenuation will be set by connecting the resistor between pin 5 and GND.

AF output

R5-G (lower) 20 kΩ

R5-G (higher) 100 kΩ

No. 729-3/15

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