The AD9850 is a highly integrated device that uses advancedDDS technology coupled with an internal high speed, highperformance D/A converter and comparator to form a complete,digitally programmable frequency synthesizer andclock generator function. When referenced to an accurateclock source, the AD9850 generates a spectrally pure, frequency/phase programmable, analog output sine wave. Thissine wave can be used directly as a frequency source, or it canbe converted to a square wave for agile-clock generator applications.The AD9850’s innovative high speed DDS core providesa 32-bit frequency tuning word, which results in an outputtuning resolution of 0.0291 Hz for a 125 MHz reference clockinput. The AD9850’s circuit architecture allows the generationof output frequencies of up to one-half the reference clockfrequency (or 62.5 MHz), and the output frequency can be digitallychanged (asynchronously) at a rate of up to 23 million newfrequencies per second. The device also provides five bits ofdigitally controlled phase modulation, which enables phaseshifting of its output in increments of 180°, 90°, 45°, 22.5°,
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