ADC nyquist filtering

https://www.analog.com/en/analog-dialogue/articles/front-end-amp-and-rc-filter-design.html

Could I replace the RC filter with a 2nd order sallen-key LP filter? and use it without the RC, connect the output of the filter directly to the ADC input?

I see the RC address the settling issue, but the BW is way much bigger than my Nyquist frequency and allows too much noise in. What do you recommend to limit the input BW and also good settling time?

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