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

Tejaswini, I don't see anything in the setup that looks unusual, so I'm not sure what is wrong yet. The test signal also looks similar to Figure 16 of the ADS131E08EVM user's guide. Have you looked at the output of the source with an oscilloscope to verify the input signal? One last important point is, what is the input you are using for the ADC? The PGA input range is defined by equation 4 in the ADS131E08 datasheet. Generally, the input signal common-mode voltage should be near mid supply, especially if there is a moderate amount of gain for the input signal. Review the equation in the datasheet and let me know how you have the input signal set up. This might get you going on the evaluation. Joseph Wu