Matt, 1) As far as I can tell, I comply with everything in your documentation. 2) I have injected signals from 20mV p-p to 2V p-p into the ADC-16 inputs. More than one channel has been tried and the results are always the same, I get oscillation of one bit in the reported output at a rate that corresponds to the injected signal. 3) When injecting into channel D4, I have confirmed that pins 37 and 38 of U8 have a differential signal of amplitude 1Vp-p on each leg. 4) I am using the Ruby script (adc16_init.rb.bat) that you gave me last year to initialize the ROACH-2 board.
What should I look at next? -Joe Kujawski
