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LM15851EVM: LM15851EVM Decimation by 10

Part Number: LM15851EVM

I'm testing an LM15851EVM attached to a TSW1457J capture board. It runs successfully with decimation of 8 and 16, but not with a decimation of 10. On the LM15851EVM Decimate-by-10, DDR is selected. In HSDC Pro LM15851_D10_DDR is loaded. The LM15851 is running at 4 Gsps and the ADC Output Data Rate is set to 400M in HSDC Pro. The spectrum looks like the windowing function is missing. Please see the attached picture. Thoughts?

Thank you for the help.