LA1193M データシートの表示（PDF） - SANYO -> Panasonic

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LA1193M

For Car Radios High-Performance FM Front End

SANYO -> Panasonic 

Continued from preceding page.

Pin No.

Function

17

IF, AGC, VCC

20

Keyed AGC input

LA1193M, 1193V

Equivalent circuit

Note

Controls the narrow AGC.

1. Oscillator Circuit

2. Local Oscillator Buffer Output

Steps were taken to prevent AMR degradation during earlier product type

AGC operation, since the local oscillator block in this IC has independent

Vd (pin 5) and ground (pin 3) connections.

This is a Colpitts oscillator and has the same structure as that used in

earlier circuits. The oscillation level and intensity are changed by

capacitors C2-4, C4 and CP.

This buffer is an emitter follower circuit.

If desired, the buffer efficiency can be increased by inserting a resistor

between pin 1 and ground to pass more current through the buffer

transistor. However, this current must be limited so that Pdmax for the

package is not exceeded.

No.4715-8/22

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