1.25 V Micropower, Precision Shunt Voltage Reference ADR1581 FEATURES PIN CONFIGURATION Wide operating range: 60 A to 10 mA ADR1581 V+ 1 Initial accuracy: 0.12% maximum Temperature drift: 50 ppm/C maximum 3 NC (OR V) Output impedance: 0.5 maximum V 2 Wideband noise (10 Hz to 10 kHz): 20 V rms TOP VIEW Operating temperature range: 40C to +85C NC = NO CONNECT High ESD rating Figure 1. SOT-23 4 kV human body model 20 400 V machine model 18 Compact, surface-mount SOT-23 package 16 APPLICATIONS 14 Portable, battery-powered equipment 12 Cellular phones, notebook computers, PDAs, GPSs, 10 and DMMs 8 Computer workstations 6 Suitable for use with a wide range of video RAMDACs Smart industrial transmitters 4 PCMCIA cards 2 Automotive 0 20 10 0 10 20 3 V/5 V, 8-bit to 12-bit data converters TEMPERATURE DRIFT (ppm/C) GENERAL DESCRIPTION Figure 2. Reverse Voltage Temperature Drift Distribution 1 100 The ADR1581 is a low cost, 2-terminal (shunt), precision band gap reference. It provides an accurate 1.250 V output for input 90 currents between 60 A and 10 mA. 80 70 The superior accuracy and stability of the ADR1581 is made possible by the precise matching and thermal tracking of on- 60 chip components. Proprietary curvature correction design 50 techniques have been used to minimize the nonlinearities in 40 the voltage output temperature characteristics. The ADR1581 30 is stable with any value of capacitive load. 20 The low minimum operating current makes the ADR1581 ideal 10 for use in battery-powered 3 V or 5 V systems. However, the wide 0 5 4 3 2 1 0 1 2 3 4 5 operating current range means that the ADR1581 is extremely OUTPUT ERROR (mV) versatile and suitable for use in a wide variety of high current Figure 3. Reverse Voltage Error Distribution applications. The ADR1581 is available in two grades, A and B, both of which are provided in the SOT-23 package. Both grades are specified over the industrial temperature range of 40C to +85C. 1 Protected by U.S. Patent No. 5,969,657. Rev. 0 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. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. QUANTITY QUANTITY 06672-001 06672-003 06672-002ADR1581 TABLE OF CONTENTS Features .............................................................................................. 1 Temperature Performance............................................................6 Applications....................................................................................... 1 Voltage Output Nonlinearity vs. Temperature ..........................7 General Description ......................................................................... 1 Reverse Voltage Hysteresis...........................................................7 Pin Configuration............................................................................. 1 Output Impedance vs. Frequency ...............................................8 Revision History ............................................................................... 2 Noise Performance and Reduction .............................................8 Specifications..................................................................................... 3 Turn-On Time ...............................................................................8 Absolute Maximum Ratings............................................................ 4 Transient Response .......................................................................9 ESD Caution.................................................................................. 4 Precision Micropower Low Dropout Reference .......................9 Typical Performance Characteristics ............................................. 5 Using the ADR1581 with 3 V Data Converters ..................... 10 Theory of Operation ........................................................................ 6 Outline Dimensions....................................................................... 11 Applying the ADR1581................................................................ 6 Ordering Guide .......................................................................... 12 REVISION HISTORY 5/07Revision 0: Initial Version Rev. 0 Page 2 of 12