Brief Description
The FX663 decodes the standard audible tone signals provided by telecom systems worldwide to indicate Dial, Ringing, Busy, Unobtainable and other stages of a call attempt. It provides the key features needed for intelligent, full-function, call progress monitoring by applications involving machine dialling or automatic call placement. The FX663 also incorporates the following features:

● Single and dual tone decoding for better cross-system Call Progress monitoring.
● "US Busy" tone detector, saving time needed for "cadence verification" under Busy and Unobtainable conditions. This incorporates a separate 620Hz detector for improved response.
● A detector to indicate speech and non-call progress signals; this reduces voice falsing of call progress tones and adds Voice-Answer detection as a "connected" prompt.
● A fax and modem tone decoder.
● A separate, adjustable threshold, signal-level detector which reduces noise falsing.

The FX663 uses new digital signal processing techniques to provide these advantages. It is a low cost, low power product with superior performance. It is available in industry standard 16-pin packages.

FEATUREs Provisional Issue
● Decodes Call Progress Tones Worldwide covering:
● Low-Power (3 Volt) Operation
● Adjustable Detection Threshold
● Single and Dual Tones
● Fax and Modem Answer/Originate Tones
● Special Information Tones
● Fast US Busy Tone Detector
● Voice Detector
● Standard 3.58MHz Xtal/Clock Input
● 16-Pin SOIC and DIP Packages