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AFE5809EVM: down-conversion frequency

Part Number: AFE5809EVM

Hi dear friends,

I have a small jam, regarding demod block -> Down Conversion more specifically in the MANUAL_FREQ, I am aware that it uses the formula 2 ^ 16 * f / Fs on page 69 (SLOS738E), for the moment I have my sampling frequency Fs 40MHz, f says it is the "down conversion frequency", this frequency must be the frequency with which I want to process ?, for example 40KHz? and there I get the value of N and that I enter the MANUAL_FREQ?

I am right? I already read a little much about down conversion but I am not understanding it, if someone please can help me understand better about the formula I would appreciate it!

Thanks!