Friends,
I have tested out the FFT analysis using 1278 EVM using ADC pro software with the same specification as data sheet with 1v(tied different amplitude up to full scale) sine wave of frequency 1Khz generated using Agilent 33250A function generator. Input is fed through the channel 4 with buffer on (buffer off also) which I believe will be changing to a differential signal and feeding to the ADC in high speed mode(tried different modes also). The best SNR value I got was way low than the datasheet specification for the same settings. The values I got are shown below
I have two evaluation board and tried with both, but getting same results. According to Data sheet minimum SNR is 101 and THD is THD -108 etc. I may be missing out something basic in this test setup. Could you please point out that?