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120dB at 4GS/s no problem, spec is on the front page of the data sheet.

https://www.analog.com/media/en/technical-documentation/data...

Edit: In case you don't know what to look for,

https://www.analog.com/en/technical-articles/noise-spectral-...

I am not a EE, but that's a 12 bit ADC, so if you aren't using the receive equalization feature, aren't you limited to about 72dB just due to quantization?

Read the linked article.

That makes sense; the total noise power is spread across the entire Nyquist bandwidth of the ADC, which is 2GHz in this case. I haven't ever worked with ADCs with such a large ratio of sampling rate to band-of-interest before, so it was mildly surprising to see 10s of dB of processing gain.

Yep, you got it.

There was a transposition in the PN in your original comment, so I couldn't find it.

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