CMX641A 查看數據表（PDF） - MX-COM Inc

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CMX641A

Dual SPM/Security Detector/Generator

MX-COM Inc  

COMMUNICATION SEMICONDUCTORS

DATA BULLETIN

CMX641A

Dual SPM/Security

Detector/Generator

ADVANCE INFORMATION

Features

• Two (12kHz/16kHz) SPM Detectors

• Selectable 12kHz/16kHz ASK Generator

• Selectable Tone Follower or Packet Mode 3-

State Outputs

• Excellent Speech-Band Rejection

• Hardwired Control for Non-µC Systems

• Selectable Bandwidth Limits and Stable Center

Frequency from a Standard Xtal

Applications

• SPM for Pair-Gain Systems

• Payphone Security Applications

• Call Charge Applications in PBX and PABX

Line Cards

• Out-of-Band Signaling Systems

• Low-Voltage FX/MX641 Replacement

• µC Software-Programmable Secure

Payphone Call Charging Apparatus

CHANNEL 1

SPM DETECTOR

SPM/SECURITY

TONE

ANALYZER - CH1

12kHz / 16kHz

ASK GENERATOR

CHANNEL 2

SPM DETECTOR

SPM/SECURITY

TONE

ANALYZER - CH2

The CMX641A is a low power, system selectable 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 sensitivity, frequency and bandwidth are independently selectable for

each channel, under µC control, as is the frequency of the security tone generator, which may be ASK

modulated by an external signal. The CMX641A is also backwards compatible with the FX641 and MX641

dual SPM detectors, while offering a lower (3.0V) operating voltage and power.

The CMX641A has two modes of operation:

1. Fixed Bandwidth Operating state, in which the two channels are set to the same system frequency and

sensitivity setting. Sensitivity and system frequency can be under either µC or external control. This state

is fully pin and function compatible with the FX641 and MX641.

2. Enhanced Features Operating state, under µC control, in which each channel has independently

controllable sensitivity, bandwidth and system frequency (12kHz or 16kHz). There is also a 12kHz/16kHz

transmission tone which can be keyed on and off directly by a dedicated logic pin.

This device is suitable for PBX/PABX line-card installations, payphone security applications and pair-gain

systems. It is available in 24-pin plastic DIP and SOIC packages and consumes ≈1.2mA at 3V.

ã2001 MX-COM, Inc.

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

Doc. # 20480227.002

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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