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CMX661

PAIR GAIN DUAL SPM DETECTOR

CML Microsystems Plc 

CML Microcircuits

COMMUNICATION SEMICONDUCTORS

CMX661

PAIR GAIN DUAL

SPM DETECTOR

D/661/3 July 2002

Features

• Two (12kHz/16kHz) SPM Detectors

• Standard 3.579545MHz Xtal

• Selectable Bandwidth Limits

• Excellent Speech-Band Rejection

• Low Power 3.0V to 5.0V Operation

Applications

Provisional Information

• Pair-Gain Systems

• Out-of-Band Signalling Systems

• Call Charge Applications in

PBX and PABX Line Cards

1.1 Brief Description

The CMX661 is a low power, Dual Subscriber Pulse Metering (SPM) Detector – two detectors on a single

chip – to indicate the presence on a telephone line of either 12kHz or 16kHz telephone call charge

frequencies. The detection frequency and bandwidth are common to both detectors and may be

externally selected. The detection sensitivity is set independently for each channel by external

components and the detector outputs can be set to a high impedance state for device multiplexing

requirements in PBX and PABX line card applications.

Flexibility of decode bandwidth settings allows the CMX661 to operate in systems where the SPM

generation is not necessarily perfectly accurate or stable. External hardwired selection of functionality

economises on the number of host µC I/O control lines required, whilst the rapid response and de-

response times of the CMX661 permit flexible tone length qualification by the host µC.

The CMX661 offers low (3.0V) operating voltage and power, consuming ≈750µA at 3V. It is available in

low-cost 16-pin plastic DIL and SOIC packages.

© 2002 CML Microsystems Plc

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