SPRAD89 March   2023 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1 , AM263P4 , AM263P4-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Use-case Considerations
  5. 3Interfacing the High Voltage Sensor
    1. 3.1 Consideration for Proper ADC Sampling
    2. 3.2 Handling High Impedance Sensor
  6. 4Performance Considerations
    1. 4.1 ADC Gain, Offset, INL & DNL
    2. 4.2 SNR Consideration
    3. 4.3 Performance Advantage
  7. 5Conclusion
  8. 6References

5 Conclusion

Supporting a high voltage sensor does not always require a high voltage ADC. This document explains multiple points that must be taken into consideration before we move to a high voltage design. A 5 V to 3.3 V attenuator circuit is a low cost, efficient way of interfacing 5 V signals to a monolithic 3.3 V ADC of Sitara™ MCU products. Signal degradation is negligible for most applications.