So, I just need to filter out the clock frequency and some anomalies at
around half the clock frequency? Sounds pretty straightforward.

I just did a spice AC-analysis on a filter with cutoff @ 500Khz,  and I must
say that it looks quite promising. I am going to do a couple of more
simulations with some other sallen-key filter configurations before I pick
up my PCB design process.

Thanks for your help, it is very much appreciated!

Sean.
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