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AD7641 EVAL Board noise floor issues

Question asked by ML_stud on Nov 10, 2016
Latest reply on Dec 4, 2016 by Gnib

Dear all,

I have set up the EVAL-AD76XXEDZ with the AD7641 and the EVAL-CED1Z. When I am trying to measure the noise floor with the EVAL-PulSAR-CED software, I am getting this (see attachments for zoom) spectrum:

AD7641 noise floor
The analog input is not connected to a source. The EVAL-CED1Z is just connected to the supplied power supply and USB.
What could cause those spectral lines and how to approach that problem?

 

Thanks a lot in advance
Best regards
Matthias

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