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AD9631 AUXDAC effects

Hi,

 

In the manual, it is stated that the DAC output voltage is set in two register 0x18 and 0x1A.

 

In my experiment, I only change the value in register 0x18. It will cause the drift of output carrier frequency, say a two-three hurdred Hz.

My carrier frequency is 2.35GHz and the reference clock is 19.2MHz.

 

Based on the manual, the settings of DAC output voltage should not affect the drift of carrier frequecy.

 

Could you help to explain such strange effects?

 

THX!

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