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* This specification are subject to be changed without notice.

AG8889

CALL WAITING DECODER

8.8.2000

APPLICATION NOTE

1. VDD, GND

To reduce noise effects, separate the analog and digital systems close to the device. For both the digital and

analog VDD pins, use a ceramic capacitor of about 0.1uF set as close as possible to the pin to bypass to the

respective GND's.

2. PWD pin

By connecting PWD pin to GND, normal mode is obtained. In the normal mode, the oscillator is activated then

ready to decode CAS signal and the chip consumes operating current. By connecting PWD pin to VDD, the

chip is on power down mode and the chip consumes just stand-by current.

3. OPO pin

This pin is the gain adjustment of internal OP Amp.

4. XIN, XOUT pins

If the resonator is used, two capacitors about 33pF and 1M( resistor have to be connected for frequency

accuracy.