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CCS/AFE4404: How to separate DC and AC volts of IR and red led (AFE4404)?

Part Number: AFE4404

Tool/software: Code Composer Studio

Hi everyone 

I want to calculation SPO2 use AFE4404 

I survey document that must use DC and AC values

but I do not have any idea to separate DC and AC volts

can anyone give me some inspiration?

very appreciate!