My customer and I are a little confused on the way the ADS5474 datasheet describes the full-scale resolution (FSR) with respect to the voltage reference. In our case, we will be driving the Vref pin with an external reference voltage of 2.5V.
Typically, the FSR is directly proportional to the reference voltage; however, Figure 38 leads us to believe that it's inversely proportional. With that said, can you please help clarify the following questions:
1) What’s the common mode level?
2) What’s the full scale amplitude that I can expect?