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* This specification are subject to be changed without notice.

AG8888

CALL WAITING DECODER

8.8.2000

signal is filtered, the detection block decodes the information and sends a valid timing to DO pin. The output data

made available at DO pin. There is a OE pin to control DO pin's output enable.

There is an external clamp circuit between internal buffer amplifier and filter. In order to get great alert tone

detection and avoid false triggering while speech signal is coming, the external clamp circuit can restrict speech

signal to (0.6Vp-p from TIP/RING.

The input signal is call waiting alert tone signals. The DO pin is normal low. When OE pin set to high and this IC

detects 2130Hz and 2750Hz frequency, then DO pin goes to high. Because OE pin set to low be for factory test,

you should notice that the users don't set it to low.

For this decoder, we put some external elements for performance concern.