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CMX673D4

Call Progress Tone Detector

CML Microsystems Plc 

D/673/5 June 2001

Features

• Worldwide Tone Compatibility

• Single and Dual Tones Detected

• Wide Dynamic Signal Range

• Fast Response Time

• Low Power Operation 500µA at 3.0V

• 3.58MHz Xtal/Clock Oscillator

CMX673

Call Progress

Tone Detector

Provisional Issue

Applications

• Worldwide Payphone Systems

• Telephone Redialling Systems

• Dialling Modems

• Banking and Billing Systems

• Telecom Test Equipment

• Telecom Security Systems

1.1 Brief Description

The CMX673 is a general purpose call progress tone detector for use in Public Switched Telephone

System (PSTN) applications. Call progress detection allows equipment which dials into the PSTN

network to monitor the progress of the resulting call. Ringing, Busy, Not available and Answer states can

be determined. The CMX673 uses advanced digital signal processing techniques to detect tones in the

frequency band 315Hz to 650Hz. The use of DSP techniques allows the CMX673 to distinguish between

valid call progress tone signals and line noise or voice, low false detection rates result. This is in contrast

to other call progress detection devices which are based on simple filtering techniques. The detection

timing of the CMX673 allows it to operate with almost any call progress system. In particular the ‘stuttered

dial tone’ of voice mail messaging systems is supported. The use of digital processing and small

geometry CMOS design techniques allows the CMX673 to offer a complete call progress detector which

analyses both frequency and amplitude in a single 8 pin package. This, coupled with industry leading

performance and substantially lower power supply requirements than comparable devices, demonstrates

CML’s unique capability in this area. A single 3.58MHz crystal ensures accurate and repeatable

performance. With supply requirements between 2.7V and 5.5V the CMX673 can be easily integrated

into a wide range of telecom equipments. The CMX673 is pin to pin compatible with the M980 and TSC

75T980 and SSI980. It is available in DIP, TSSOP and SOIC packages. The CMX673 integrated circuit

coupled with cadence measurement of the signals detected can identify virtually all call progress tones

used worldwide.

© 2001 Consumer Microcircuits Limited

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