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- Detects Single and Dual Call Progress Tones
- Worldwide Call Progress Tone Compatibility
- 'Voice' Detect Outputs (Fast and Slow)
- Wide Dynamic Range
- Low Falsing
- Low-Power Operation
(600µA at 3.0V)
- Worldwide Payphone Systems
- Telephone Redialing Systems
- Dialling Modems
- Banking and Billing Systems
- Telecom Test Equipment
- Telecom Security Systems
- CMX683D4 - 16-pin SOIC
- CMX683E4 - 16-pin TSSOP
- CMX683P1 - 8-pin PDIP
- 2.7 to 5.5 V power supply
The CMX683 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 CMX683 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 CMX683 offers excellent sensitivity coupled with low false detection rates.
The response time of the CMX683 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 statistical processing techniques, which analyse signal frequency, duration and
amplitude, enable the CMX683 to distinguish voice or music activity from DTMF or Call Progress signals.
Separate outputs integrate the "voice" activity over both shorter and longer periods, enabling payphone and other billing systems to commence charging when a line connection has been established.
A single 3.58MHz crystal ensures accurate and repeatable performance.
With supply requirements between 2.7V and 5.5V and a low current consumption, the CMX683 can be
easily integrated into a wide range of telecom equipments.
The CMX683 has a similar pinout to all commonly used Call Progress detectors and is available
in DIP, TSSOP and SOIC packages.
Block Diagram
