Strange Data Glitch on AD4003 FMC on ZC706


We noticed a strange data glitch on the AD4003 running the evaluation FMC card - shown below. Captured conditions were CNV rate of 1.6 MSPS and SCK rate of 80 MHz using VIO = 2.5V.  We've changed the timing of our signals (CNV, SCK) and tried VIO = 3.3V.  

Below is a scope capture showing the values over multiple SPI transactions where we honor the Tquiet1 and Tquiet2 thresholds.  The above capture was from a Xilinx Debug ILA, which we showed was capturing the same data values as the scope when we compared them.

I've read through the datasheet a couple times and can't find another potential cause of something like this. Other ideas of what can be done?  Has anyone else seen this?

Thank you for your time.

Added Tags to post for internal tracking purposes.
[edited by: @skowalik at 1:22 PM (GMT 0) on 26 Sep 2019]
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