I'm looking to use a LTC2986 to measure Pt100 RTDs and wanted to know the accuracy requirement for the Rsense to meet the temperature error specifications. I couldn't find the error contribution anywhere in the datasheet but I guess since it's ratiometric a 0.01% error in the Rsense would be a 0.01% error in the RTD resistance?
If the chip is powered and no measurements are active I assume the inputs are high impedance and I could measure the Rsense directly with a 4 wire measurement? I just see that the data sheet is always listing the Rsense resistance in ohms to two decimal places, so I assume it needs to be very accurately reported.
I also couldn't find an ESD tolerance specification in the datasheet. Is there any integrated protection?
Lastly I assume the higher excitation current the better for signal to noise and leakage current compared to excitation current, so I was intended to use a 1k Rsense with .5mA excitation, but the specified error for Pt100 RTDs mentions using a 2k Rsense, requiring a lower excitation current. Am I missing something?