I am using the AD9680-500 sampling at 491.52MHz. I am measuring the SNR (fin=15.36MHz) around 60dB.
The datasheet shows on Figure 80 SNR around 68.9dB @10MHz, so I was expecting something close.
From the SNR formula above the Figure 139 and by replacing SNR ADC by 69.8dB and if I am correct, it seems that the clock jitter would be around 10ps to get 60dB SNR. Clock jitter simulation gives me 235fs (1kHz - 100MHz). The noise flloor with no signal is around 100dBFS.
So, the other source of noise would be the power supply, isnt it? Or is there something I am missing.
Thanks for your help.