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Difference between pseudo differential and differential ADC

Hello everybody,

I'm facing some existential questioning and I'd be happy and relieved if someone come along with me in my quest.

I'm using the AD7451 a 12 bit pseudo differential ADC in my design to better cancelation of common mode noise as my sensing and processing functions are on two separate boards.

I now want to change to an AD7450 the differential version to convert a differential signal. Here is my question. How come one is differential and other fully differential while their respective datasheets show the same internal structure?

Thank you guys.