SBAA436 March 2021 REF34-Q1 , REF3425 , REF3425-EP , REF3430 , REF3430-EP , REF3433 , REF3433-EP , REF3440 , REF3440-EP , REF3450 , REF4132 , REF4132-Q1 , REF50 , REF5020-EP , REF5020A-Q1 , REF5025-EP , REF5025-HT , REF5025A-Q1 , REF5030A-Q1 , REF5040-EP , REF5040A-Q1 , REF5045A-Q1 , REF5050-EP , REF5050A-Q1 , REF50E , REF6125 , REF6133 , REF6141 , REF6145 , REF6150 , REF6225 , REF6230 , REF6233 , REF6241 , REF6245 , REF6250 , REF70
Multiple industrial applications, such as grid monitoring and remote field sensors, require instrumentation that operates with high precision over a long period of time. For such use cases with long life times, the Long-Term Drift (LTD) parameter of voltage references, becomes critically important. This application note describes the Long-Term Drift parameter, factors which affect it, how it is measured and gives sample profiles of some of the TI precision voltage references.
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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.