SLAAE47A May   2022  – August 2022 DAC11001A , DAC11001B

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2DAC Error Sources
    1. 2.1 Offset Error
    2. 2.2 Gain Error
    3. 2.3 Integral Non Linearity (INL)
    4. 2.4 Noise Sources
  5. 3Error Sources from Reference
    1. 3.1 Initial Accuracy
    2. 3.2 Temperature Drift
    3. 3.3 Load Regulation Error
    4. 3.4 Line Regulation Error
    5. 3.5 0.1 - 10 Hz Peak-to-Peak Noise
    6. 3.6 Example Using REF7025
  6. 4Error Sources from Inverting and Non-Inverting Gain Stage
    1. 4.1 Input Offset Voltage Error
    2. 4.2 Input Offset Voltage Drift Error
    3. 4.3 Power Supply Rejection Ratio (PSRR) Error
    4. 4.4 Open Loop Gain Error
    5. 4.5 Resistor Tolerance Error
  7. 5Example Calculation using DAC11001A
  8. 6Error Summary
  9. 7References
  10. 8Revision History

3.2 Temperature Drift

The variation in VREF over temperature is defined by its temperature coefficient (TC, also referred to as temperature drift) which has units of ppm per degree Celsius (ppm/oC). The temperature coefficient can be specified over several different temperature ranges, including the commercial temperature range (0 to 70oC), the industrial temperature range (-40 to 85oC), and the extended temperature range (-40 to 125oC). Error due to temperature drift can be calculated by the following equation. Please note that the below equation assumes uses the box method for calculating the error. The box method calculates TC using the difference in the maximum and minimum VREF measurements over the entire temperature range . For more information about this method, please refer to the article Voltage Reference Selection Basics

Equation 6. Temperature Coefficient Error ppm=Output Voltage TempCoppm/oC×Max Operating temperature Range