LA7583 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA7583

IF Signal Processing Circuit (A2C PLL VIF + SIF) for TVs and VCRs

SANYO -> Panasonic 

Continued from preceding page.

Pin

No.

Symbol

10 VCOR

LA7583

Circuit Configuration

Description

Pin 10 is the pin for connecting the resistor

that determines the impedance of the

oscillation point of the oscillating circuit by

the ceramic oscillator. Oscillation frequency

variations can be reduced by connecting a

resistor with a tolerance of 1% between pin

10 and pin 12.

11 AFT OUTPUT

12 VCO2

Pin 11 is the AFT output pin. This pin

determines the gain (control sensitivity: β

(kHz/mV)) according to the R1 and R2

bleeder resistance values. β is decreased in

weak electric fields by AGC voltage in order

to reduce malfunction of AFT. R1 and R2

must be 200 kΩ or less.

AFT curve for medium/

strong electric fields

AFT curve for weak

electric fields

Pin 12 is the ceramic oscillator (VCO2) pin.

A series resonance-type oscillator is used to

oscillate 1/8 of the IF signal.

Japan = 58.75 MHz × 1/8

U.S. = 45.75 MHz × 1/8

Continued on next page.

No.5177-9/16

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