I have a ADC board based on AD9248 65MSPS.
I don't have any anti aliasing filter so I need to put a first-order RC filter at the input of ADC.
in the AD9248 datasheet, the default amount of R and C is 33Ohm and 22pF respectively.
but when the sampling rate is 65MHz so the RC cut off frequency should be 32.5MHz.
How should I design RC filter for the best accuracy? I have concern about settling time and LSB accuracy