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M52342FP

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M52342FP 技术参数

M52342FP

Pin 23 (APC FILTER)

In the locked state, the cut-off frequency of the filter is

adjusted effectively by an external resistor so that it will be in

the range of around 30 to 200 kHz.

In case the cut-off frequency is lower, the pull-in speed

becomes slow. On the other hand, a higher cut-off frequency

widen the pull-in range and band width, which results in a

degradation in the S/N ratio. So, in the actual TV system

design, the appropriate constant should be chosen for getting

desirable performance considering above conditions.

Bias

(V23)

(Pin 23 output)

3.4 V_O-P

(FM mod. frequency)

100 kHz

(IF input frequency)

In the application, an offset between AFT center frequency and VCO free-running frequency, can be improved by

connecting a 220 kΩ resistor to V_CCsupply (pin 21).

A buzz noise also decreases by connecting a capacitor from

pin 23 to V_CC(pin 21) or GND. This effect utilizes the signal

interference on the printed circuit board. So, the

determination that which connection is effective, to V_CCor

GND, is done by a cut and try method.

The capacitor of less than 680 pF, which depends on Q of

VCO coil, is recommended to prevent an APC pull-in range

from narrowing.

220 k

Taking it into consideration in the actual TV set design.

Rev.2.00 Jun 14, 2006 page 16 of 18

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