Datasheet ADR390, ADR391, ADR392, ADR395 (Analog Devices) - 8

ADR390/ADR391/ADR392/ADR395 TERMINOLOGY Temperature Coefficient Long-Term Stability
The change of output voltage with respect to operating temper- Typical shift of output voltage at 25°C on a sample of parts ature changes normalized by the output voltage at 25°C. This subjected to a test of 1000 hours at 25°C. parameter is expressed in ppm/°C and can be determined by the ∆VO = VO(t0) − VO(t1) following equation: ⎛ V (t ) −V (t ) ⎞ V T V T ΔV [ppm] = O 0 O 1 × 6 10 (2) TCV (1) O ⎜⎜ ⎟⎟ O [ppm/ C ° ] O ( 2 ) – O ( 1 ) 6 = ⎝ V (t ) O 0 ⎠ V T T O ( × 25 C ° ) × ( 2 1 ) 10 – where: where: VO (t0) is VO at 25°C at Time 0. VO (25°C) is VO at 25°C. VO (t1) is VO at 25°C after 1000 hours operation at 25°C. VO (T1) is VO at Temperature 1. V
Thermal Hysteresis
O (T2) is VO at Temperature 2. The change of output voltage after the device is cycled through
Line Regulation
temperatures from +25°C to –40°C to +125°C and back to The change in output voltage due to a specified change in input +25°C. This is a typical value from a sample of parts put voltage. This parameter accounts for the effects of self-heating. through such a cycle. Line regulation is expressed in either percent per volt, parts- per-million per volt, or microvolts per volt change in input VO_HYS = VO(25°C) − VO_TC (3) voltage. V 25 ( o C) − V O O _ TC 6 V [ppm] = ×10 (4)
Load Regulation
O _ HYS V 25 ( o C) O The change in output voltage due to a specified change in load current. This parameter accounts for the effects of self-heating. where: Load regulation is expressed in either microvolts per milli- VO (25°C) is VO at 25°C ampere, parts-per-million per milliampere, or ohms of dc VO_TC is VO at 25°C after a temperature cycle from +25°C to output resistance. −40°C to +125°C and back to +25°C Rev. G | Page 8 of 20 Document Outline FEATURES APPLICATIONS PIN CONFIGURATION GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ADR390 ELECTRICAL CHARACTERISTICS ADR391 ELECTRICAL CHARACTERISTICS ADR392 ELECTRICAL CHARACTERISTICS ADR395 ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION DEVICE POWER DISSIPATION CONSIDERATIONS SHUTDOWN MODE OPERATION APPLICATIONS INFORMATION BASIC VOLTAGE REFERENCE CONNECTION Stacking Reference ICs for Arbitrary Outputs A Negative Precision Reference without Precision Resistors General-Purpose Current Source High Power Performance with Current Limit CAPACITORS Input Capacitor Output Capacitor OUTLINE DIMENSIONS ORDERING GUIDE