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Hi Afzal Hayat,
THD and SFDR are parameters related to measuring AC signals, while the ADS1235 is typically used for DC signal measurements including resistive bridges and load cells.
Therefore, we include relevant DC signal measurement parameters such as RMS noise, effective resolution, and noise-free bits in the ADS1235 datasheet.
You can learn more about noise parameters in our Precision Labs content on Noise, specifically module 6.3: https://training.ti.com/ti-precision-labs-adcs
-Bryan