picbased A2D with low pass filter

[rocky79]

Hey fellows,
Does anyone know if i can safely add an RC low pass filter before the PIC16c770 A2D input. Take a look at the page 116 of the datasheet, they have the A2D input model with a 5pf to ground. I am concerned if added the capacitor of the low pass filter to the Pic input it will affect the hold time and mess up the A2D operation.
Worse come to worse i would add a buffer. Any ideas?
Thanks a lot

[Comatose]

As long as you don't violate the input impedance requirements (less than 10k, less than 5k is better) then you can plunk whatever filter you want onto the input. A standard R/C will be no problem whatsoever.

[rocky79]

Thanks comatose.