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How to generate a fixed phase chirp with AD9953 ?

Hi, I have a question about the phase setting in AD9953 eval.  I already successfully generated a chirp (bandwidth = 20MHz, fc=110MHz, duration= 2ms). The chirp is triggered by I/Oupdate.

The issue is the initial phase must be fixed in this application. That is each chirp should be identical. Is there any way to set the initial phase in AD9953? Should I use the phase accumulator Thank you.

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