In one of my projects, I wanted to connect a DAC acting as a reference voltage source (Vref) directly to the Vref input of a PGA component.
I just wanted to know is that is a good idea in terms of interfacing the two components together since I didn't find much about the input resistance of the PGA.
The VDAC has a 4kOhm typical value for the 1.024V range, so the PGA has to be at least 10 times that to be considerable (I think).
The datasheet has the nominal value of the G setting R's for the PGA.
Computing Zin -