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SNR AD9680-500

Question asked by Chris449 on May 24, 2017
Latest reply on Jun 14, 2017 by UmeshJ

Hello Umesh,

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.