Hi Bill, There are measurements of the PCB with EV8AQ160 installed near DC posted on our Wiki:
https://www.cfa.harvard.edu/twiki/bin/view/SMAwideband/MeasuringAndSettingParametersOfTheFourCores The plots are in terms of SINAD, linearly transformed to ENOB as follows. ENOB = (SINAD-1.76)/6.02 You can see the improvement due to core correction in these plots. ENOB (or SINAD) is by definition measured with a tone, which should be full scale amplitude at the A/D input. The degradation in performance at the high end is likely in large part due to frequency roll off of the ADC response, thus it's not really a full scale input at high f. It's probably better not to put too much stock in ENOB as a spec if, as I think is the case, your astronomical signal is noise-like in spec. Noise power ratio may be of interest, and some measurements can be found here: https://www.cfa.harvard.edu/twiki/bin/view/SMAwideband/NoisePowerRatioMeasurements Cheers, Jonathan On Jun 5, 2012, at 2:44 PM, Bill Petrachenko wrote: > I've been looking at the ADC1x5000-8 board (which I assume is the same as the > ASIAA board) . In the data sheet for the the EV8AQ160 they show that > full-bandwidth is 2-GHz but then fail to give performance for ENOB, SNR, etc > above 620-MHz. Does anyone know what ENOB/SNR is at 2-GHz? > > Thanks, -Bill. > >
