CML - Wireless Data - CMX589A

The CMX589A is a single-chip full-duplex synchronous data pump/modem designed for Wireless Data Applications. Employing Gaussian filtering for Minimum Shift Keying (GMSK) baseband modulation applications, the CMX589A features a wide range of available data rates from 4000 to 200000 (200k) b/s. Data Rates and the choice of BT (0.3 or 0.5) are pin programmable to provide for different system requirements.

The Tx and Rx digital data interfaces are bit serial, synchronized to generated Tx and Rx data clocks. Separate Tx and Rx Powersave inputs allow full or half-duplex operation. Rx input levels can be set by suitable AC and DC level adjusting circuitry built with external components around an on-chip Rx Input Amplifier. Acquisition, Lock, and Hold of Rx data signals are made easier and faster by the use of Rx Control Inputs to clamp, detect, and/or hold input data levels and can be set by the µProcessor as required. The Rx S/N output provides an indication of the quality of the received signal.

Block Diagram


  • Full Duplex (GMSK)
  • Data Rates: 4kbps to 200kbps
  • Selectable BT: 0.3 or 0.5
  • Simple Control: No µP Required


  • Meets RCR STD-18
  • Wireless LAN/Modems
  • Rx Only AIS Monitors
  • Automatic Vehicle Location Links
  • Wireless Data Links for PCs, Laptops and Printers
  • Point-Of-Sale Terminals
  • Wireless Bar-Code Readers and Stock Controllers
  • Wireless Local Loop
  • Amateur Packet Radio
  • Wireless ISDN

Supply Requirement:

  • 3.0 to 5.5 V