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Cordless voice module

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article image Typical range of 350m outside or 75m inside.

NATIONAL Semiconductor, represented by Arrow Electronics , has released a cordless voice module (CVM) that integrates a radio transceiver and baseband with a complete protocol stack on a single board.

System designers can more easily and cost-effectively design a DECT or 2.4GHz cordless telephone. The module also allows customers to integrate cordless phone capabilities into products where they weren't previously feasible because of complexity, size or cost.

Two versions are available. The SC14CVM2.4 uses National's SC14428 baseband controller. This is a CMOS chip optimised to handle all the audio, signal and data processing for a 2.4GHz ISM digital band handset or base station. The complete protocol stack and application interface are integrated in ROM code. RF for the SC14CVM2.4 is provided by the LMX4268, a radio transceiver integrated circuit optimised for the 2.4GHz system. As a result, the module has a typical range of 350m outside and 75m indoors. The LMX4268 is a complete DCT radio transceiver compliant with the FCC standard.

The SC14CVM1.9 is optimised for the digital enhanced cordless telecommunications (DECT) standard. It has National's SC14428 baseband controller and the LMX4168, a radio transceiver integrated circuit. The LMX4168 has the same specifications as the LMX4268, but is specially designed for the 1.9GHz band and is compliant with the ETSI TBR06 standard.

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