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Features
- Two (12kHz/16kHz) SPM Detectors on a Single Chip
- Programmable Decode Bandwidth
- Xtal Accuracy; Stable Frequency Limits
- High Speechband Rejection Properties
- 'Output Enable' Multiplexing Facility
Applications
- Pair Gain Systems
- Call Charge Applications on PABX Line Cards
- Hotel and Office Call-Charge/ Logging Systems
- Wireless Local Loop
- Billing Systems
- Public Call Monitoring
Package Styles:
- CMX661D4 - CMX661P3
Supply Requirement:
2.7V power supply
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.
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.
