CMX631A 查看數據表（PDF） - CML Microcircuits

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CMX631A

Low Voltage SPM Detector

CML Microcircuits 

CMX631A

Low Voltage

SPM Detector

D/631A/1 May 1998

Features and Applications

• Detects 12kHz or 16kHz SPM

Frequencies

• Tone Follower and Packet Mode

Outputs

• High Speech-Band Rejection

Properties

• Low Power Operation (2.7V <0.8mA)

Provisional Information

• Call Charge Applications on PABX Line

Cards

• Complex and/or Simple Telephone

Systems

• Remote Telephone/Payphones

Brief Description

The CMX631A is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector that indicates

the presence of either 12kHz or 16kHz telephone call-charge frequencies on a telephone line.

Deriving its input directly from the telephone line, input amplitude/sensitivities are component adjustable to

the user's national ‘Must/Must-Not Decode’ specifications via an on-chip input amplifier. The 12kHz and

16kHz frequency limits are accurately defined by the use of an external 3.579545MHz telephone-system

Xtal or clock-pulse input.

The CMX631A demonstrates exceptional 12kHz and 16kHz performance in the presence of both voice and

noise. This device may operate from a single or differential analogue signal input, from which two individual

logic outputs will be produced; a Tone Follower Output and a Packet Mode Output.

This system (12kHz/16kHz) selectable integrated circuit, requires a 2.7V to 5.5V power supply which may be

line-powered, is available in the following packages: 24-pin SSOP (CMX631AD5), 16-pin SOIC

(CMX631AD4), and 16-pin PDIP (CMX631AP3). Additional package styles may be available to meet

specific design requirements.

© 1998 Consumer Microcircuits Limited

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