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CMX909B Datasheet Gmsk Packet Data Modem

Manufacturer: Consumer Microcircuits Limited

Overview: CML Microcircuits MUNICATION SEMICONDUCTORS CMX909B GMSK Packet Data Modem D/909B/2 November.

General Description

The CMX909B is a half-duplex Gaussian Minimum Shift Keyed (GMSK) BT=0.3 modem data pump with on-chip packet data handling.

GMSK modulation optimises the data throughput for a given bandwidth RF channel and the on-chip packet data handling relieves the host µC of regular processing tasks, such as maintaining Bit and Frame Synchronisation, Block Formatting, CRC and FEC Error Processing, Data Interleaving and Scrambling.

The demodulator uses decision feedback equalisation techniques to reduce the channel distortion effects and enhance the receiver performance without the putational overhead of maximum likelihood (Viterbi) estimation methods.

Key Features

  • GMSK Modulation/Demodulation.
  • On-chip Packet Detection.
  • Rx or Tx up to 38.4kbits/sec.
  • Parallel Host Processor Interface.
  • Full and Short Data Packet Framing.
  • Low Power 3.0V/5.0V Operation.
  • Mobitex Compatible including R14N Short Block Frames.
  • Flexible Operating and Powersave Modes 1. Brief.

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CMX909B Distributor