We configured the EVM to be able to work with 3-wire PT1000 RTD. We used Fluke 712B RTD Simulator instead of a real sensor.
Here is the resistance and capacitance values:
RF1=RF2= R6=R7=4k7 Cdıff=100nF Ccm=10nF
RF3=RF4=R28=R29=1k Cdiff=100nF Ccm=10nF
We routed IDAC1 from AIN2 to AIN0 and IDAC2 from AIN3 to AIN1. In order to have a 3rd lead we populated the R30 resistor as 0 ohm.
After that, common leads of RTD have been connected to RREFP0 and AIN1. The other one has been connected to AIN0.
When we measured the voltage between AIN1-AIN0, somehow it was negative but the digital conversions were looking good. Datasheet says AIN1 should be larger than AIN0, if Im not mistaken. We wonder how it is possible. What do you think ?