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DE9944 Demonstration Kit

The DE9944 is a compact demonstration/evaluation platform for FDMA Analogue / Digital Radio designs based on the CMX7141 FDMA PMR Processor and incorporating the CMX618 RALCWI Vocoder, the CMX7262 TWELP Professional Radio Vocoder, and the CMX994 Direct Conversion Receiver. The board can be used to demonstrate a complete RF transceiver and baseband function supporting a direct conversion receiver and VCO 2-point modulation transmitter. The DE9944 features a built in keyboard, display, microphone and speaker and so can be used to demonstrate peer-to-peer operation in a stand-alone configuration. The board has an ARM processor which handles initial board power up and loading of the Function ImagesTM for the CMX7141 and CMX7262. Once the system is powered up, the processor implements a basic radio. The DE9944 provides a Fractional-N PLL and VCO plus associated circuits to provide local oscillator signals for the CMX994. The design also includes a 1W power amplifier, harmonic filter and Tx/Rx switch. The RF performance is designed to be compliant with EN 301 166 for dPMR application and TIA‑603‑D / EN 300 086 for analogue applications. All the circuits are provided with power-down capability to allow powersave / standby operation.

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