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AD9251 Evaluation: the minimum signal frequency

Question asked by yunqifu@nudt.edu.cn on Aug 15, 2016
Latest reply on Aug 16, 2016 by DougI

I bought a HSC-ADC-EVALCZ capture board plus a AD9251 EVL. In my project, the signal frequency which need to be sampled is below 30KHz.

 

Now, I have a problem. It is found that the signal frequency below 76KHz could not be sampled accurately; I have attaced some results. The signal frequency is 26 KHz, 66KHz and 76KHz. In this case,the sampling rate is set to be 20MHz.

 

So, I want to know what is the minimum signal frequency that could be sampled accurately by AD9251 EVL. Meanwhile, if AD9251 EVL could not satify me, could you please reconmend another A/D product. 

Thank you so much!

 

图1 26K.bmp

 

图4 66K.bmp

 

图4 76K.bmp

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