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AD7606 resolution


I used AD7606-4 detect voltage signal,I found the resolution just can achieve 2mV.

1.I used AFG31152(signal generator ) to create the voltage signal. when the input signal change 1mV, the output code of AD7606, did not change. But the  input signal change 2mV, the output code of AD7606 had a change. 

2, I also found the absolute value of the measure result had about 10mA error, when the input signal set to 1V.

The resolution and the precision can not meet the datasheet, What could be the problem.

Thank you!