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Dual Subscriber Private Metering (SPM) Detector

FX641


Product Data
Click resource title to access in full FX641 Datasheet (rev4)

Features:

  • Two (12kHz/16kHz) SPM Detectors on a Single Chip
  • Detects 12kHz and 16kHz SPM Frequencies
  • Xtal Accuracy; Stable Frequency Limits
  • 'Controlled' and 'Fixed' Signal Sensitivity Modes
  • Selectable Tone Follower or Packet Mode Outputs
  • High Speech-Band Rejection Properties
  • 'Output Enable' Multiplexing Facility

Applications:

  • Payphones
  • FeaturePhones
  • PBX Line Cards

Supply Requirement:

  • 4.5 to 5.5 V power supply

The FX641 is a low-power, system-selectable Dual Subscriber Private 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.

Under processor control via a common serial interface, each channel of the FX641 will detect call-charge pulses from a telephone line and provide a digital output for recording, billing or security purposes.

A common set of external components and a stable 3.579545MHz Xtal/clock input ensures that the FX641 adheres accurately to most national 'Must and Must-Not' decode band-edges and threshold levels.

The digital output is pin-selectable to one of three modes:

  1. Tone Follower Mode - a logic level for the period of a correct decode
  2. Packet Mode - respond/ de-respond after a cumulative period of tone or notone in a preset period
  3. High-impedance Output - for device multiplexing

For non-Processor systems, a preset sensitivity/system input allows external channel level and system setting.
This device, which is suitable for PBX and PABX line-card and remote telephone installations, is available in a compact 24-pin plastic SOIC package.


Block Diagram

FX641: a system-selectable Dual Subscriber Private Metering (SPM) Detector to indicate the presence, on a telephone line, of either 12kHz or 16kHz telephone call-charge frequencies

Design Support Information

 
Package: D2 (DW) 24-pin SOIC
Package: D2 24-pin SOIC
 
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