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LA7578N

IF Signal Processing (Super PLL-II VIF + SIF) Circuit for TVs and VCRs

SANYO -> Panasonic 

LA7578N

Pins 15 and 16 (VCO tank)

These pins are for the VCO tank circuit.

The tank circuit capacitor is designed to be 20 to 27 pF. 24 pF

is recommended. The VCO tank capacitor can be either built

into the coil or a component in chip form. This circuit protects

VCO from external influences.

Fig. 21

Fig. 22

Pin 17 (composite video output)

This is an output pin for the video signal including a 4.5 MHz

component.

Although this is an emitter output, a resistor should be

connected between pin 17 and GND in order to attain

satisfactory drive capability.

VCC = 12 V

VCC = 9 V

R ^ 1.2 kΩ

R ^ 1 kΩ

Fig. 23

Pin 18 (APC filter)

This is the APC filter pin.

APC time constant switching is performed within the IC. When

locked, VCO is controlled by route A, and the APC loop gain

decreases. When unlocked or when there is a weak electric

field, VC is controlled by route B and the APC loop gain

increases, broadening the pull-in range. The recommendations

for this APC filter are: R = 47 to 150 Ω;

C = 0.47 µF.

No.4037-14/18

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