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The DE6491 wireless voice link demonstration kit 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 865MHz European licence-exempt band, this demo kit consists of two separate stand-alone PCBs each with a CMX649-based audio stage, an RF transceiver stage and a controlling microprocessor.
The basic design will support other frequency ranges.
The PCBs are designed to work in an interactive master/slave relationship over a range of about 20m; 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 real time, the two-way voice-audio transfer between units.
This demonstration exhibits the high quality voice capabilities of the CMX649 codec IC.
As stand-alone units, each PCB can operate from an onboard (AAA) battery pack or a bench supply in the range 2.9 to 10V; under manual "pushbutton" control, earpiece volume, RF channel and power-save functions can be set.
Additionally, as befits a battery-powered product, intelligent power saving will put the product into a low-power state when no audio is being transferred and will revert to power-up on receipt of a voice audio input.
If contact is lost between the master and slave units, the slave unit will automatically power down.
Power considerations, per unit, are between 16.5 and 25mA when communicating, with a power-save requirement of 120uA.
Each onboard microcontroller is programmed before shipping, with the latest version of operating firmware; the mcu can be reprogrammed and debugged in-circuit using a proprietary programmer.
For the design engineer, this demo kit gives the opportunity to examine the CMX649 in varying environments, and provides high resolution schematic diagrams; to further assist in the design process, expansion facilities are provided for power supply lines and connections to the MCU I/O port.
Although the DE8691 demo kit is supplied to operate within the 863 to 865MHz frequency band, using the schematic information, a change of components around the transceiver IC and the addition of an external antenna, will enable operation to a different band.
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