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AD7641 EVAL Board clipping and software issues

Question asked by ML_stud on Feb 15, 2017
Latest reply on Feb 16, 2017 by Gnib

Dear all,

 

I have set up the EVAL-AD76XXEDZ with the AD7641 and the EVAL-CED1Z. When I am trying to measure a signal with the EVAL-PulSAR-CED software, I am getting this output:

The signal parameters are:

  • AWG: Agilent 33120A
  • Vpp = 5,063V
  • V_Offset = -1,2V
  • f = 40,4Hz
  • CLOCK: INT. (EvalBoard)
  • The second differential input is connected to AGND

 

My questions are:

  What is the reason for the "clipping" at approx. 1,5V?

 

And consequently:

  1. How reliable is the Eval PulSAR-CED.vi-software? (I think there have occured some differences between the spectrum and scope waveform)
  2. Are there any possibilities to get the pure digital codes quickly?

 

Thanks a lot in advance
Best regards
Matthias

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