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This will be refference voltages for ur adc input; if u choose them.
If dont then select the combination from the device datasheet so that +ve is set to VDD(VCC) and -ve to VSS.
You can apply an external reference voltage to the +ref and -ref to either change the range of the A/D or improve the accuracy by using a stable known reference voltage.
As said its to expand the measurement range of the adc.
A digital adc value of zero would be an analog input voltage equal to the voltage applied to the ref-, and a maximum adc value 1024 for 10 bit would be obtained from an analog input voltage equal to the voltage applied to the ref+ pin.
The idea is so that you can measure accross a span of voltages rather than just from zero to 5v or whatever, usefull if you were say measuring a 12v accumulator where the voltage would only normally vary from 12 to 14v, the reolution would be much better than measuring from zero to 14v.
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