How to match ADC input impedence plz urgent ?

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ADC output unstable ..

one more thing when i connected external ADC input (load cell sensor) source the last digit getting fluctuating and i tried in 12 and 16 bit also .as of my thinking y it is getting is when the mc busy with some other tasks (digital switching) with analog switching (ADC) at that time it may occur write ? and we are using Freescale 8bit mc and its having inbuilt ADC maximum 16 bit with Vref is 3.3V so, the s tep size V will be very less and if any ground fluctuating is there also it will affect to ADC ,So plz suggest me as soon as possible this is my very imp project.
 

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