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CML wireless data modem IC saves space, components

Posted: 06 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:cml microcircuits? gmsk? packet-data modem? rf transceiver? cmx990?

CML Microcircuits has rolled out a single-chip GMSK packet-data modem with RF transceiver that 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.

The company said that the new CMX990 wireless data modem IC is not only time-saving due to its easy fuss-free design-in (using the readily available CML evaluation boards), but is also space and component-saving because of its cleverly designed circuitry, which consumes a mere 3V.

Offering a data range of 4kbps to 16kbps with selectable BT values, at RF frequencies of 400MHz to 1GHz, the half-duplex IC is configurable 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. Additionally, and automatic Rx clock extraction and signal level measurement and compensation allow the CMX990 modem to operate in all signal conditions.

Employing external VCO inputs, the 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.

To speed-up the design-in of the CMX990 and to allow designers full access to all functions of the chip and its external components, two separate full-feature PCB-based kits are availablethe EV9900 to demonstrate general data operation, and the DE9901, a total 'plug-and-play' Mobitex operation. Complete with an embedded Mobitex object code, the DE9901 will enable the user to 'log-in' directly to an on-air Mobitex network.

The new CMX990 is available in a 'no-leads' 64 VQFN package.

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