adc reading errors

Dear all,

I have problems on reading the ADS8326 16bit ADC, 250ksps output. The
uP reads the ADC Dout continuously at the moment, and each time the
reading is different although the input is a constant DC voltage.
There is a Instrument amp at the front end of the ADC input, and I put
some of the decouple caps in,e.g., the In+ , Vref, Vcc, etc. The Vref
is connected to the Opamp output.

I am not sure if it the the ground bouncing noise cause problem or
not. All components are on the breadboard, but they have digital
ground and analog gound seperately.

Can someone give me some ideas?

Many Thanks
.

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