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anti aliasing filter for an ADC

Question asked by xzsawq21 on Aug 10, 2017
Latest reply on Aug 24, 2017 by Clarence.Mayott


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