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ADC32RF42: seeing FS/4 significant noise on signa

Part Number: ADC32RF42

Good afternoon, 
We are seeing significant correlated FS/4 noise on our ADC samples. We confirmed that this ADC had 2 cores per channel so we only expected FS/2 interleaving noise, not FS/4. Our sampling rate is 800MHz. 
See images for the signal with no additional filter, a 2 sample average, and a 4 sample average