Tool/software:
Hello everybody,
The ADS1263 is really a good ADC, i enjoy using it at low frequencies (10sps) using FIR filtering both 50Hz and 60Hz.
I use it with a PT100 sensor in a four-wire measurement, with 1mA excitation current from IDAC1.
The current source comes out of the ADC, crosses the PT100 resistor and then re-enters my board into the 2.38k reference resistor, which gives a reference of 2.38V used by the ADC.
By programming a gain of 8V/V and adjusting filters frequency cutoff, I feel i get a very good differential measurement of the PT100.
1- I don't need offset calibration because the inputs are differential and moreover i use the ADC in the chop mode so all offsets are cancelled.
2- But do i need a full scale calibration ?
- I mean the reference resistor is ultra very stable (0,01%),
- And it seems that the resulting voltage at reference resistor is always the maximum binary code of the ADC.
I am exactly in the case of this TI datasheet, but it doesn't say anything about ADC calibration :
SBAA201A – MARCH 2013 – REVISED MARCH 2023
https://www.ti.com/lit/an/sbaa201/sbaa201.pdf
Thanks !
Damien
