Support for ADM/PCM codec IC speeds design-ins

28 July 2004 Telecoms, Datacoms, Wireless, IoT

The DE6491 Wireless Voice Link Demonstration Kit recently released by CML Microcircuits, is a PCB-based kit that provides instant evaluation, design and operational access to designers of radio-voice products using CML's latest low-power CMX649 audio codec IC.

Operating as a short range device in the 863 to 865 MHz European licence-exempt band, this DemoKit consists of two separate standalone PCBs each with a CMX649-based audio stage, an RF transceiver stage and a controlling microprocessor. The basic design can support other frequency ranges. The PCBs are designed to work in an interactive master/slave relationship over a range of about 20 m; and facilities are provided to investigate lower power/range settings. Using the supplied headsets, each with an integral microphone and earpiece, the user can investigate, in realtime, the two-way voice-audio transfer between units.

As standalone units, each PCB can operate from an on-board (AAA) battery pack or a bench supply in the range 2,9 to 10 V. Power considerations, per unit, are of between 16,5 and 25 mA when communicating, with a powersave demand of 120 µA.

Each on-board µController is programmed before shipping, with the latest version of operating firmware; the µC can be reprogrammed and debugged in-circuit using a proprietary programmer.

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