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## ADR5043 Datasheet(HTML) 10 Page - Analog Devices

 10 / 16 pageADR5040/ADR5041/ADR5043/ADR5044/ADR5045Data SheetRev. B | Page 10 of 16TERMINOLOGYTemperature CoefficientThe change in output voltage with respect to operating temperaturechanges. It is normalized by an output voltage of 25°C. Thisparameter is expressed in ppm/°C and is determined by thefollowing equation:( )( )()()610C25Cppm×−×°−=°12UTO1OUT2OUTOUTTTVTVTVTCV(1)where:VOUT(25°C) = VOUT at 25°C.VOUT(T1) = VOUT at Temperature 1.VOUT(T2) = VOUT at Temperature 2.Thermal HysteresisThe change in output voltage after the device is cycled throughtemperatures ranging from +25°C to −40°C, then to +125°C, andback to +25°C. This is common in precision reference and iscaused by thermal-mechanical package stress. Changes in envi-ronmental storage temperature, board mounting temperature, andthe operating temperature are some of the factors that cancontribute to thermal hysteresis. The following equationexpresses a typical value from a sample of parts put throughsuch a cycle:()[]()()6]]]]10C25C25ppmC25×°−°=−°=OUTTCOUTOUTHYSOUTTCOUTOUTHYSOUTVVVVVVV(2)where:VOUT(25°C) = VOUT at 25°C.VOUT_TC = VOUT at 25°C after a temperature cycle from +25°C to−40°C, then to +125°C, and back to +25°C.

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