Forum Post: RE: ADS131E08EVM-PDK: Not able to see correct ADC input on ADS131e08 EVM software scope

Tejaswini, I was able to connect up a function generator and measure a 50Hz, 50mV input signal with the ADS131E08EVM: I did have some initial problems setting it up, which may be similar to what you're seeing. There were some periodic spikes, and the output was similar to yours, but they cleared up when I made sure the function generator and the EVM had the same common ground. The negative output of the function generator is likely not a ground and the ADC input requires some set common-mode voltage. In the end, I needed to make an extra connection from the function generator negative output to the EVM ground. In my case, this was TP11. After that, the ADC data came out clearly as a sine wave. Joseph Wu