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

2 Use-case Considerations

First, we need to check if the sensor really needs a 5 V ADC. Many sensors are rated for 5 V or works on a 5 V supply, but the analog output will not go beyond 3.3 V in the use case. As a good example the temperature sensor LM50 operates on 5 V or higher supply but within the desired -40 C to 150 C operating window the maximum analog output voltage will be limited well below 3.3 V. So this sensor can easily be connected to Sitara™ ADC without any additional hardware.