TIDA-010933: Why this Gain of AMC3330 and AMC1311 in the design

Tool/software:

Hello experts,
I am currently designing a voltage sense system for my project, both AC and DC.
So, when I was studying the design for TIDA-010922, I saw that these ICs (AMC1311 and AMC3330) are utilized for voltage sensing, which is rather straightforward to use and can be  connected to ADC.(According to sbaa229b - Interfacing a Differential-Output (Isolated) Amp to a Single-Ended Input ADC),

But the gain utilized for the DC-DC AMC1311 is 0.15, whereas on the AC side it is 0.75.
Why is that?So on the AC side sensing, 1.65V (half of 3.3V, assuming that is the voltage of the ADC) is used as Vcm or Vref.To convert a +-2V differential signal into a 0-3.3V single ended signal? Correct?But when I enter the values into the formula (given in SBAA229b), the outcome ranges from 3.18V to 0.1125V.


Am I missing something? Or did I misunderstand something?
Similar material for AMC1311?

Sorry, i am still new to this stuff.

Please let me know what i am missing.

I am attaching the SS of differentail to single ended signal stage.

Thanks and Regards,
Naveen