Other Parts Discussed in Thread: ADS1113, ADS1115,
Comparing the diagram of ads1113 with ads1114 and ads1115
It indicates a significant different input structure - ads1113 has no PGA in the input. Never the less the datasheet does not distinguish between the three versions. And the equivalent diagram for the input are the same.
I assume then that the PGA is also a switched amplifier of some sort and not a classical "linear" amplifier.
Is that correctly observed?