RF transceiver enables 'minimalist wireless modems'

17 November 2004 Telecoms, Datacoms, Wireless, IoT

"The miniature wireless modem end-product is now a reality," announced CML Microcircuits as it launched its new time, space and component-saving wireless data IC, the CMX990.

A single-chip GMSK packet-data modem with RF transceiver, this innovative half-duplex IC offers: a versatile baseband modem, IF and RF processing functions, programmable synthesizers, signal level-setting functions and comprehensive on-chip and peripheral control, monitoring and interfacing.

With a data rate of 4 to 16 Kbps with selectable BT values, at RF frequencies of 400 MHz to 1 GHz, the CMX990 is formattable to both freeformat and packet data schemes, is fully Mobitex-compatible and can be set to comply with EN 300 113 and FCC CFR 47 Part 90 standards. Fomattable to freeformat or packet operations, the CMX990 uses simple task-command configuration to provide simplicity and efficiency to the control and operation of the modem. FEC, CRC, data scrambling and interleaving functions are available. Automatic Rx clock extraction and signal level measurement and compensation allow the CMX990 modem to operate in all signal conditions.

Employing external VCO inputs, two programmable on-chip synthesisers provide all the frequencies necessary for wireless data operation. Addressable on-chip DACs and ADCs are available for control and monitoring of a wide range of external functions, including system levels and the VCO loops, with separate dedicated functions for RF PA stage and TCXO control.

The CMX990 operates on 3 volts and is available in a 'no-leads' 64 VQFN package. Two separate full-feature PCB-based kits are available: the EV9900 to demonstrate general data operation, and the DE9901, a total 'plug-and-play' Mobitex operation.

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