CMX589A

– Versatile Full-duplex GMSK Modem

Modems

CMX589A

– Versatile Full-duplex GMSK Modem

The CMX589A is a single-chip full-duplex synchronous data GMSK modem designed for Wireless Data Applications. Employing Gaussian filtering for Minimum Shift Keying 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. 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.

Devices are available through our Distributor Network.

Download Datasheet

Block diagram of the CMX589A chip, labelled with data retime and level shift, Tx filter, clock divider, Rx circuit control, Rx filter, Rx DC level measure, Rx data/S-N detection and Rx clock blocks

Block Diagram CMX589A

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FX589 and CMX589A FAQ

What tone frequencies are on the output of a GMSK modem?

A. Tone frequencies are not used to carry data in GMSK. GMSK = Gaussian Minimum Shift Keying – The data is shaped through a Gaussian filter and then directly modulated onto an FM radio carrier.