Hi Greg,
I have next concerns about PGA. In my system I need to measure AC (50-60Гц.) till 40-50-th harmonics. As I understand for this case before ADC I should have bandwidth at least 6kHz. As in datasheet we have bandwidth only for small signal I afraid that for large signal close to rail I could met the issue, as for large signal we usually look for slew rate values.
Thus slew rate is needed to determine state before ADC, while Settling Time is a figure of the ADC.
If there is another way to determine the bandwidth for large signal at the input of the ADC after PGA let me know.