Product Summary

The CMX683D4 is a general purpose Call Progress tone detector for use in monitoring the progress of calls in Public Switched Telephone System (PSTN) applications. Dial Tone, Ringing, Busy and Not Available states can be distinguished by using the host μC to qualify the cadence of the CP DETECT output. The CMX683D4 uses advanced digital techniques to characterise valid Call Progress tones, unwanted tones, line noise and voice or music signals. In contrast to Call Progress detection devices based on simple filtering techniques, the CMX683D4 offers excellent sensitivity coupled with low false detection rates. The applications of the CMX683D4 include Worldwide Payphone Systems, Telephone Redialling Systems, Dialling Modems, Banking and, Billing Systems, Telecom Test Equipment, Telecom Security Systems.

Parametrics

CMX683D4 absolute maximum ratings: (1)Supply (VDD - VSS): -0.3 to 7.0 V; (2)Voltage on any pin to VSS: -0.3 to VDD + 0.3 V; (3)Current into or out of VDD and VSS pins: -30 to +30 mA; (4)Current into or out of any other pin: -20 to +20 mA.

Features

CMX683D4 features: (1)Detects Single and Dual Call Progress Tones; (2)Worldwide Call Progress Tone Compatibility; (3)“Voice” Detect Outputs (Fast and Slow); (4)Wide Dynamic Range with Low Falsing; (5)Low Power Operation: 600μA at 3.0V typ.; (6)3.58MHz Xtal/Clock Oscillator.

Diagrams

CMX683D4 block diagram