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With the SOC in post #3 you can expect

[URL unfurl="true"]https://www.infineon.com/dgdl/Infineon-AN84783_Accurate_Measurement_Using_PSoC_3_and_PSoC_5LP_DeltaSigma_ADCs-ApplicationNotes-v05_00-EN.pdf?fileId=8ac78c8c7cdc391c017d07359bfd58e9[/URL]

[URL unfurl="true"]https://www.infineon.com/dgdl/Infineon-AN61290_PSoC_3_and_PSoC_5LP_Hardware_Design_Considerations-ApplicationNotes-v17_00-EN.pdf?fileId=8ac78c8c7cdc391c017d07254f524a25[/URL]

[URL unfurl="true"]https://www.infineon.com/dgdl/Infineon-AN57821_PSoC_3_PSoC_4_and_PSoC_5LP_Mixed_Signal_Circuit_Board_Layout_Considerations-ApplicationNotes-v13_00-EN.pdf?fileId=8ac78c8c7cdc391c017d072e356a52c8[/URL]

And there is always CDS to eliminate offsets and noise :

[URL unfurl="true"]https://www.infineon.com/dgdl/Infineon-AN66444_PSoC_3_and_PSoC_5LP_Correlated_Double_Sampling_to_Reduce_Offset_Drift_and_Low_Frequency_Noise-ApplicationNotes-v05_00-EN.pdf?fileId=8ac78c8c7cdc391c017d073054915445[/URL]

[ATTACH=full]192649[/ATTACH]

Regards, Dana.