Part Number: INA241A
Other Parts Discussed in Thread: ADS131M08,
Hi TI expert,
We are using a current sensing circuit with the ADS131M08 and INA241A (gain = 100) to measure DC current. The OSR of the ADS131M08 is set to 128.
When the current through the external shunt is disabled (i.e., no current flowing), the INA241A inputs are shorted by the shunt. Under this condition, the ADC reading should represent the system offset. However, we observe a reading swing of 60 mA, which we attribute to noise. When we short the INA241A output directly, the noise reduces to 6 mA.
This suggests that the noise is generated by the INA241A. We have carefully checked the reference voltage and ground noise for the INA241A, and both appear quite clean. Adding a large filter before the ADC or increasing the ADC OSR would help, but these are not preferred as we still require fast dynamic response.
Could you please advise why the INA241A exhibits such noise output, and whether there is any way to eliminate or reduce it?
Thank you.
