Datasheet ADR512 (Analog Devices) - 7

Data Sheet ADR512 PARAMETER DEFINITIONS TEMPERATURE COEFFICIENT THERMAL HYSTERESIS
This is the change of output voltage with respect to operating Thermal hysteresis is defined as the change of output voltage temperature changes, normalized by the output voltage at 25°C. after the device is cycled through the temperature from +25°C This parameter is expressed in ppm/°C and can be determined to −40°C to +85°C and back to +25°C. This is a typical value with the fol owing equation: from a sample of parts put through such a cycle.  ppm  V V = V (25°C) − V O (T −V T 2 ) O ( 1 ) 6 TCV = (1) O _ HYS O O _ TC O    °C  V V °C − (2) O ( °C)×( ×10 25 T −T 2 1 ) 25 V ppm = V O O TC ×10 O _ HYS [ ] ( ) _ 6 where: VO (25°C) VO(25°C) = VO at 25°C where: VO(T1) = VO at Temperature 1 VO(25°C) = VO at 25°C VO(T2) = VO at Temperature 2 VO_TC = VO at 25°C after temperature cycle at +25°C to −40°C to +85°C and back to +25°C Rev. A | Page 7 of 12 Document Outline Features Applications Pin Configuration General Description Revision History Specifications Electrical Characteristics Absolute Maximum Ratings Thermal Resistance ESD Caution Typical Performance Characteristics Parameter Definitions Temperature Coefficient Thermal Hysteresis Applications Section Adjustable Precision Voltage Source Output Voltage Trim Using the ADR512 with Precision Data Converters Precise Negative Voltage Reference Outline Dimensions Ordering Guide