The AD9850 is a highly integrated device that uses advanced DDS technology coupled with an internal high speed, high performance,D/A convertor and comparator, to form a complete digitally programmable frequency synthesizer and clock generator function. when referenced to an accurate clock source, the AD9850 generates a spectrally pure, frequency/phase-programmable, analogue sine output. This sine wave can be used directly as a frequency source or converted to a square wave for agile-clock generation applications. The AD9850'sinnovative high speed DDS core provides a 32-bit frequency tuning word, which results in an output tuning resolution of 0.0291Hz, for a 125 MHz freference clock input. The unit can control the phase in 11.5 deg steps. In parrallel mode the frquency can be changed 23 million times a second and a max output frequency of 62.5 MHz.. The unit is in a 28-lead SSOP surface mount package...

In Parrallel mode the data is 5 bytes (= 40 bits).

In serial mode the data is a stream of 40 bits clocked in.