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AD9854 can't chirp negative side using the chirp mode or Ramped FSK mode

Question asked by on Oct 17, 2016
Latest reply on Oct 31, 2016 by JLKeip

I try to use the chirp mode of the AD9854. Other functions are working except for the chirp to negative side. I follow to the instruction at the page of 27 of the specification, but I can't not get the right chirp. the positive side chirp is fine.

Is there anyone who happened this problem? Is there any register that I need to set? Or is there possibility for my chip broken?