CMX673 Просмотр технического описания (PDF) - MX-COM Inc

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CMX673

Call Progress Tone Detector

MX-COM Inc  

COMMUNICATION SEMICONDUCTORS

DATA BULLETIN

CMX673

Call Progress Tone Detector

PRELIMINARY INFORMATION

Features

• Worldwide Tone Compatibility

• Fast Response

Stutter Dial Tone

Single and Dual Tones

• Industry Compatible Pin Out

• Wide Dynamic Signal Range

• Low Power: 0.5mA at 3.0V

• 3.0V to 5.0V Operation

• 3.58MHz Xtal/Clock Oscillator

Applications

• Worldwide Payphone Systems

• Featurephone active feature confirmation

• Telephone Redialing Systems

• Dialing Modems

• Banking and Billing Systems

• Telecom Test Equipment

• Telecom Security Systems

ENABLE

LEVEL

DETECTOR

SIGNAL

INPUT

AMPLIFIER

SIGNAL

ANALYZER

CONTROL

AND

OUTPUT

LOGIC

CALL PROGRESS

DETECTOR

CALL

PROGRESS

DETECT

The CMX673 is a low voltage multi-purpose Call Progress Tone detector for use in Public Switched Telephone

Network System (PSTN) applications. Call progress detection allows equipment that dials into the PSTN to

monitor the progress of the resulting call. Various states such as Ringing, Busy, Not available, and Answer

can be determined. Using digital signal processing techniques the CMX673 accurately analyzes tones in the

315Hz to 650Hz frequency band and distinguishes valid call progress tone signals from line noise or voice.

This contrasts with other call progress detection devices that are based on simple filtering techniques. When

combined with cadence measurement of the CMX673 output, the rapid detect response time of the CMX673

allows it to support a wide range of call progress functions including ‘stutter dial tone’ detection used in voice

messaging systems.

A single, low cost 3.58MHz crystal ensures accurate and repeatable performance. With supply requirements

between 2.7V and 5.5V the CMX673 is easily integrated into a wide range of telecom applications.

The convenient CMX673 pin out allows it to be readily incorporated into existing product designs to quickly

achieve its benefits. Small geometry CMOS design techniques provide a complete call progress detector that

analyzes both frequency and amplitude in a small single package. Available packages are: 8-pin PDIP

(CMX673P1), 16-pin SOIC (CMX673D4), and 20-pin TSSOP (CMX673E3).

ã2001 MX-COM, Inc

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480182.007

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.

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