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Keeping initial phase difference between DDS channels

Question asked by Vladib on Feb 27, 2011
Latest reply on Mar 6, 2011 by Vladib

Hello Colleagues,

 

I am planning to use the AD9958 DDS to generate the two signals.
The signal of the first channel - periodic linear frequency sweep signal,
which is controlled by profile pin (Please see fig.38 of AD9958 data sheet).
The signal of the second channel - single tone.
My design requires constant difference of the initial phases above signals
at the rising edge on the profile pin.
This means that I must adjust the initial phase of the second channel
at the beginning of each period of sweep.
What means of DDS programming I can do it?

Sincerely yours,

Vlad

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