Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References ADR420/ADR421/ADR423/ADR425 FEATURES PIN CONFIGURATION Low noise (0.1 Hz to 10 Hz) TP 1 8 TP ADR420/ ADR421/ ADR420: 1.75 V p-p V 2 7 NIC IN ADR423/ ADR421: 1.75 V p-p ADR425 6 V NIC 3 OUT TOP VIEW ADR423: 2.0 V p-p GND 4 (Not to Scale) 5 TRIM ADR425: 3.4 V p-p NIC = NO INTERNAL CONNECTION Low temperature coefficient: 3 ppm/C TP = TEST PIN (DO NOT CONNECT) Long-term stability: 50 ppm/1000 hours Figure 1. 8-Lead SOIC, 8-Lead MSOP Load regulation: 70 ppm/mA GENERAL DESCRIPTION Line regulation: 35 ppm/V Low hysteresis: 40 ppm typical The ADR42x are a series of ultraprecision, second generation Wide operating range eXtra implanted junction FET (XFET) voltage references ADR420: 4 V to 18 V featuring low noise, high accuracy, and excellent long-term ADR421: 4.5 V to 18 V stability in SOIC and MSOP footprints. ADR423: 5 V to 18 V Patented temperature drift curvature correction technique and ADR425: 7 V to 18 V XFET technology minimize nonlinearity of the voltage change Quiescent current: 0.5 mA maximum with temperature. The XFET architecture offers superior High output current: 10 mA accuracy and thermal hysteresis to the band gap references. It Wide temperature range: 40C to +125C also operates at lower power and lower supply headroom than APPLICATIONS the buried Zener references. Precision data acquisition systems The superb noise and the stable and accurate characteristics High resolution converters of the ADR42x make them ideal for precision conversion Battery-powered instrumentation applications such as optical networks and medical equipment. Portable medical instruments The ADR42x trim terminal can also be used to adjust the out- Industrial process control systems put voltage over a 0.5% range without compromising any Precision instruments other performance. The ADR42x series voltage references Optical network control circuits offer two electrical grades and are specified over the extended industrial temperature range of 40C to +125C. Devices have 8-lead SOIC or 30% smaller, 8-lead MSOP packages. ADR42x PRODUCTS Table 1. Initial Accuracy Model Output Voltage, VOUT (V) mV % Temperature Coefficient (ppm/C) ADR420 2.048 1, 3 0.05, 0.15 3, 10 ADR421 2.50 1, 3 0.04, 0.12 3, 10 ADR423 3.00 1.5, 4 0.04, 0.13 3, 10 ADR425 5.00 2, 6 0.04, 0.12 3, 10 Rev. I 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. 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Trademarks and registered trademarks are the property of their respective owners. 02432-001ADR420/ADR421/ADR423/ADR425 TABLE OF CONTENTS Features .............................................................................................. 1 Device Power Dissipation Considerations.............................. 16 Applications....................................................................................... 1 Basic Voltage Reference Connections ..................................... 16 Pin Configuration............................................................................. 1 Noise Performance..................................................................... 16 General Description ......................................................................... 1 Turn-On Time ............................................................................ 16 ADR42x Products............................................................................. 1 Applications..................................................................................... 17 Revision History ............................................................................... 2 Output Adjustment .................................................................... 17 Specifications..................................................................................... 3 Reference for Converters in Optical Network Control Circuits......................................................................................... 17 ADR420 Electrical Specifications............................................... 3 High Voltage Floating Current Source .................................... 17 ADR421 Electrical Specifications............................................... 4 Kelvin Connections.................................................................... 18 ADR423 Electrical Specifications............................................... 5 Dual-Polarity References........................................................... 18 ADR425 Electrical Specifications............................................... 6 Programmable Current Source ................................................ 19 Absolute Maximum Ratings............................................................ 7 Programmable DAC Reference Voltage .................................. 19 Thermal Resistance ...................................................................... 7 Precision Voltage Reference for Data Converters.................. 20 ESD Caution.................................................................................. 7 Precision Boosted Output Regulator ....................................... 20 Pin Configurations and Function Descriptions ........................... 8 Outline Dimensions....................................................................... 21 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 22 Terminology .................................................................................... 15 Theory of Operation ...................................................................... 16 REVISION HISTORY 5/11Rev. H to Rev. I 7/04Rev. D to Rev. E Added Endnote 1 in Table 2............................................................ 4 Changes to Ordering Guide .............................................................5 Added Endnote 1 in Table 3............................................................ 5 3/04Rev. C to Rev. D Added Endnote 1 in Table 4............................................................ 6 Changes to Table I .............................................................................1 Added Endnote 1 in Table 5............................................................ 7 Changes to Ordering Guide .............................................................4 Deleted A Negative Precision Reference Without Precision Updated Outline Dimensions....................................................... 16 Resistors Section ............................................................................. 17 Deleted Figure 42 Renumbered Sequentially ............................ 17 1/03Rev. B to Rev. C Updated Outline Dimensions ....................................................... 21 Changed Mini SOIC to MSOP ........................................Universal Changes to Ordering Guide .......................................................... 22 Changes to Ordering Guide .............................................................4 Corrections to Y-axis labels in TPCs 21 and 24 ............................9 6/07Rev. G to Rev. H Enhancement to Figure 13 ............................................................ 15 Changes to Table 2............................................................................ 3 Updated Outline Dimensions....................................................... 16 Changes to Table 3............................................................................ 4 Changes to Table 4............................................................................ 5 3/02Rev. A to Rev. B Changes to Table 5............................................................................ 6 Edits to Ordering Guide ...................................................................4 Updated Outline Dimensions ....................................................... 21 Deletion of Precision Voltage Regulator section........................ 15 Changes to Ordering Guide .......................................................... 22 Addition of Precision Boosted Output Regulator section ....... 15 Addition of Figure 13..................................................................... 15 6/05Rev. F to Rev. G Changes to Table 1............................................................................ 1 10/01Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 22 Addition of ADR423 and ADR425 to ADR420/ADR421...............................................................Universal 2/05Rev. E to Rev. F Updated Format..................................................................Universal 5/01Revision 0: Initial Version Updated Outline Dimensions ....................................................... 21 Changes to Ordering Guide .......................................................... 22 Rev. I Page 2 of 24