SBAA436 March   2021 REF34-Q1 , REF3425 , REF3425-EP , REF3430 , REF3430-EP , REF3433 , REF3433-EP , REF3440 , REF3440-EP , REF3450 , REF4132 , REF4132-Q1 , REF5010 , REF5020 , REF5020-EP , REF5020A-Q1 , REF5025 , REF5025-EP , REF5025-HT , REF5025A-Q1 , REF5030 , REF5030A-Q1 , REF5040 , REF5040-EP , REF5040A-Q1 , REF5045 , REF5045A-Q1 , REF5050 , REF5050-EP , REF5050A-Q1 , REF6125 , REF6133 , REF6141 , REF6145 , REF6150 , REF6225 , REF6230 , REF6233 , REF6241 , REF6245 , REF6250 , REF70

 

  1.   Long-Term Drift in Voltage References
  2.   Trademarks
  3. 1Long-Term Drift
  4. 2Long-Term Drift Data Sheet Measurement
  5. 3Long-Term Drift Error
  6. 4Package and Mold Compound Stress
  7. 5Test Setup
  8. 6Temperature Effect
  9. 7Long-Term Drift Estimation
  10. 8Methods to Minimize LTD Impact
  11. 9Reference

1 Long-Term Drift

The reference voltage is a critical component in a signal chain and can impact the performance if careful consideration not provided to various the error sources. The output of the voltage reference varies depending on the temperature, input voltage, load current, and time. This application note focuses on deviations of the output voltage over time due to aging known as Long-Term Drift (LTD) or long-term stability. LTD is a key parameter in industrial and automotive applications where a system will not experience regular calibration over its lifetime. The error from LTD can dominate all other errors over time. Therefore, it is important to understand how the parameter is tested and specified for the data sheet.