https://docs.amd.com/r/en-US/ug480_7Series_XADC/Reference-Inputs-VREFP-and-VREFN?contentId=GQmB_J2myTzNHTTKtHOBIw
Reference Inputs (VREFP and VREFN) - Reference Inputs (VREFP and VREFN) - UG480
Reference Inputs (V REFP and V REFN ) These high-impedance inputs are used to deliver a differential reference voltage for the analog-to-digital conversion...
referenceinputs