The AD9854 digital synthesizer is a highly integrated device that uses advanced DDS technology, coupled with two internal high-speed, high-performance quadrature D/A converters and a comparator to form a digitally-programmable I and Q synthesizer function. When referenced to an accurate clock source, the AD9854 generates highly stable, frequency-phase-amplitudeprogrammable sine and cosine outputs that can be used as an agile L.O. in communications, radar, and many other applications. The AD9854's innovative high-speed DDS core provides 48-bit frequency resolution (1 microHertz tuning steps). Phase truncation to 17 bits assures excellent SFDR. The AD9854's circuit ( continued on page 14)