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Problem using EVAL-7768FMCZ + Datasorm DAQ

Category: Hardware
we are using EVAL-7768FMCZ demo board with DataStorm DAQ setup as per this guide with the only difference that we are using a single channel function generator connected to 0+ and GND (0- is shorted to GND). The generator output a 1KHz sinusoid 100 mVpp and when we read data from the remote client (ie your IIO oscilloscope, Python script ...) we see a sinusoid with the right frequency but with some noise then, when we raise to 500 mVpp, the sinusoid get clipped on the lower side and distorted on the top (as you can see on the attached image). The problem is not present when we add a 1V offset on the generator. Where are we going wrong ?