Hi Team,
I designed a set of circuit by referring to the 3-wire RTD circuit in the data sheet of ADS1262. I want to use ADS1262 channel AIN4 and AIN5 to measure RTD, and I want to use AIN1 and AIN6 to internal current source 250uA and internal reference using 2.5v.
My application requirement is RTD-pt 100 (-200.000 to 850.000)deg C 0.001 resolution. So the maximum input voltage 100mV (250uA*400 ohms = 100mv). I applied Gain16. possible to read 0.001 resoltion?
the problem is i measured internal current source with IDAC rotation enabled (247.8uA to 248.8uA) jumping. so the total ADC count is jumping. the measuring device FLUKE 5522A used. i attached the circuit.ADS-1262-UPI-dkd.pdf