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AD9851 Ringing?

Question asked by TLengr on Dec 2, 2015
Latest reply on Jan 11, 2016 by TLengr

I am using an AD9851 with +5V supply in an FM signal generator application. The frequency control word is updated serially each 11.77 microseconds to provide the needed FM deviation. The udfcw pulse produces ringing on both rise and fall transitions. The signal is single ended and piped through the on-board 70MHz low pass filter. I have a cloned board but the filter appears to be identical to the filter on the 'clock' evaluation board. The output is terminated with 100 ohms. The scope probe is x10, 6.5pFd. Is this filter not suitable for this application or is there reason to suspect something else? Thanks.100_3383.JPG