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AD9958 output amplitude variation

Question asked by Epalatn on Apr 28, 2013
Latest reply on Apr 29, 2013 by Epalatn

Hello Everybody,

 

I built a board with AD9958 - the way it is suggested in the spec sheet. I need to generate output signals in the range of 30 to 150MHz. I noticed as I change the frequency setting, the output amplitude varies almost two times.

 

I looked through the spec sheet, but I did not notice amplitude variation vs frequency spec. I would think that amplitude should not change with frequency; there are no specific filters on the DAC's output as far as I see..

 

I still suspect something wrong with my board, but in general - is there a notion for the output of DDS to stay at the same amplitude over the frequency range?

 

Thank you,

 

Epalatn

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