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How to generate two frequency-tunable sin waves with tunable phase offset with each other?

Hello

         I'd like to generate two frequency-tunable sin waves with tunable phase offset with each other. One for the LO demoduation source, the other to modulate. And these two waves must refer to one source, so that they have very low relative phase noise. 

         A dual channel DDS may help, such as AD9958. But the dual outputs are from two DDS cores. 

         I'm wondering whether AD9854 can do the job. It has two DAC outpus, but one single DDS. However the datasheet says that the phase of two DAC outputs can only be 90 degree different and tuned at the same offset.

         Is it possible that the two outpus phase difference of AD9854 can be tuned from 0-180?

Best regards.