Low-power direct digital synthesiser

23 January 2008 Analogue, Mixed Signal, LSI

Analog Devices has introduced a complete low-power, low-cost direct digital synthesiser (DDS) specifically designed for wireless, handheld equipment. Unlike competing approaches used to synthesise a digitally controlled frequency, the AD9913 is said to be the first DDS device to deliver a 250 MHz clock rate while consuming as little as 50 mW of power. The new IC is suited for portable barcode scanners, radar detectors, remote radio controls and other products that require a cost-effective combination of performance and low-power operation. Unlike phase-locked loop devices, which suffer from settling times measured in microseconds and fine-tuning limitations, the AD9913 settles in nanoseconds with granularity well below 10 mHz. Other approaches, including FPGAs with embedded DDS functions, have difficulty matching the AD9913's greater than 80 dB spurious-free dynamic range performance on a 100 MHz output signal while requiring higher operating power and the addition of a discrete digital-to-analog converter to synthesise the sine wave.

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