Boron ADC outputting random values

When connected to a varying voltage source the ADCs output is little better than random, outputs varying from 0 to 4445+, the voltage range is 0-0.4V, when testing the ADC with the 3.3V bus the output is in the 1000-2000 range I have tried this with 2 new borons and have got the same result. Any suggestions, please?

You do have the signal ground and the Boron's GND connected, right?
You also don't need (want) to call pinMode() before analogRead() as analogRead() implicitly sets a special pin mode.

thanks, I was using a separate power supplies for the signal and boron, using the same one fixed the problem

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