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Selecting Voltage References Slide 12

Initial accuracy and temperature drift are two key basic criteria for the selection of a voltage reference. Some parts show very good initial accuracy, however under elevated temperatures the accuracy level can be significantly reduced. A good understanding of the thermal conditions and calibration requirements of a given application is necessary to properly determine the combined accuracy for a given device. For example, the initial accuracy of REF33xx is better than of REF32xx, but the accuracy for the total temperature range of REF32xx is better. The designer is advised to consult the temperature characteristics in the respective datasheets to comprehend the relevant temperature effects for a given design. A good overview is also provided in the Texas Instruments application note “Voltage Reference Selection Basics”, number 123, available at http://www.ti.com/lit/an/snva602/snva602.pdf.

PTM Published on: 2012-10-16