Lpc2000

Sorry if this is an obvious question.  But, I have looked at the User 
Manual, and all other documentation I have and can not find a 
specification for input impedance on the ADC input pins????

Does anybody know what this impedance is??

I am going to be feeding a signal with a 200k impedance to one of the 
ADC inputs and am trying to figure out if I need a buffer or not.

Thanks,
Dave Butler