Low Noise Micropower 2.5 V and 4.096 V Precision Voltage References ADR291/ADR292 FEATURES CONNECTION DIAGRAMS Supply range NC 1 8 NC ADR291/ V 2 7 NC 2.8 V to 15 V, ADR291 IN ADR292 NC 3 6 V TOP VIEW OUT 4.4 V to 15 V, ADR292 (Not to Scale) GND 4 5 NC Supply current: 15 A maximum Low noise: 8 V and 12 V p-p (0.1 Hz to 10 Hz) NC = NO CONNECT High output current: 5 mA Figure 1. 8-Lead SOIC (R-8) Temperature range: 40C to +125C NC 1 8 NC Pin-compatible with REF02/REF19x ADR291/ 2 7 V NC IN ADR292 NC 3 TOP VIEW 6 V OUT APPLICATIONS (Not to Scale) GND 4 5 NC Portable instrumentation NC = NO CONNECT Precision reference for 3 V and 5 V systems Figure 2. 8-Lead TSSOP (RU-8) Analog-to-digital and digital-to-analog converter reference GND Solar-powered applications Loop-current-powered instruments V V OUT IN 321 ADR291 TOP VIEW (Not to Scale) Figure 3. 3-Lead TO-92 (T-3) GENERAL DESCRIPTION The ADR291 and ADR292 are low noise, micropower precision coefficients for the three grades are 8 ppm/C, 15 ppm/C, and 25 ppm/C maximum, respectively. Line regulation and load voltage references that use an XFET reference circuit. The new XFET architecture offers significant performance improvements regulation are typically 30 ppm/V and 30 ppm/mA, maintaining over traditional band gap and buried Zener-based references. the references overall high performance. For a device with 5.0 V Improvements include one quarter the voltage noise output of output, refer to the ADR293 data sheet. band gap references operating at the same current, very low and The ADR291 and ADR292 references are specified over the ultralinear temperature drift, low thermal hysteresis, and extended industrial temperature range of 40C to +125C. excellent long-term stability. Devices are available in the 8-lead SOIC, 8-lead TSSOP, and The ADR291/ADR292 family is a series of voltage references 3-lead TO-92 packages. providing stable and accurate output voltages from supplies as Table 1. ADR291/ADR292 Product low as 2.8 V for the ADR291. Output voltage options are 2.5 V Temperature and 4.096 V for the ADR291 and ADR292, respectively. Output Initial Coefficient Quiescent current is only 12 A, making these devices ideal for Part No. Voltage (V) Accuracy (%) (ppm/C) Max battery-powered instrumentation. Three electrical grades are ADR291 2.500 0.08, 0.12, 0.24 8, 15, 25 available offering initial output accuracies of 2 mV, 3 mV, ADR292 4.096 0.07, 0.10, 0.15 8, 15, 25 and 6 mV maximum for the ADR291, and 3 mV, 4 mV, and 6 mV maximum for the ADR292. Temperature Rev. F Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. 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Trademarks and registered trademarks are the property of their respective owners. 00163-003 00163-001 00163-002ADR291/ADR292 TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 13 Applications ....................................................................................... 1 Device Power Dissipation Considerations .............................. 13 Connection Diagrams ...................................................................... 1 Basic Voltage Reference Connections ..................................... 13 General Description ......................................................................... 1 Noise Performance ..................................................................... 13 Revision History ............................................................................... 2 Turn-On Time ............................................................................ 13 Specif icat ions ..................................................................................... 3 Applications Information .............................................................. 14 ADR291 Electrical Specif ications ............................................... 3 High Voltage Floating Current Source .................................... 14 ADR292 Electrical Specif ications ............................................... 4 Kelvin Connections .................................................................... 14 Absolute Maximum Ratings ............................................................ 6 Low Power, Low Voltage Reference for Data Converters ..... 14 ESD Caution .................................................................................. 6 Voltage Regulator for Portable Equipment ............................. 15 Pin Configurations and Function Descriptions ........................... 7 Outline Dimensions ....................................................................... 16 Typical Performance Characteristics ............................................. 8 Ordering Guide .......................................................................... 17 Terminology .................................................................................... 12 REVISION HISTORY 5/11Rev. E to Rev. F 9/03Rev. B to Rev. C Deleted Negative Precision Reference Without Precision Deleted ADR290 ................................................................. Universal Resistors Section ............................................................................. 14 Changes to Specifications ................................................................. 2 Deleted Figure 33 and Figure 34, Renumbered Sequentially ... 14 Changes to Ordering Guide ............................................................. 4 Updated Outline Dimensions ....................................................... 13 Changes to Ordering Guide .......................................................... 17 12/07Rev. D to Rev. E Changes to Features .......................................................................... 1 Changes to Figure 34 ...................................................................... 14 3/06Rev. C to Rev. D Updated Format .................................................................. Universal Change to Table 8 ............................................................................. 6 Updated Outline Dimensions ....................................................... 15 Changes to Ordering Guide .......................................................... 16 Rev. F Page 2 of 20