High Precision 10 V IC Reference AD581 FEATURES FUNCTIONAL BLOCK DIAGRAM Laser trimmed to high accuracy +V S 10.000 V 5 mV (L and U models) Trimmed temperature coefficient 5 ppm/C maximum, 0C to 70C (L model) V OUT 10 ppm/C maximum, 55C to +125C (U model) AD581 Excellent long-term stability 25 ppm/1000 hrs (noncumulative) GND 10 V reference capability Low quiescent current: 1.0 mA maximum TO-5 BOTTOM VIEW 10 mA current output capability Figure 1. 3-pin TO-5 package MIL-STD-883 compliant versions available GENERAL DESCRIPTION The AD581J, AD581K, and AD581L are specified for operation The AD581 is a 3-pin, temperature compensated, monolithic, from 0C to 70C the AD581S, AD581T, and AD581U are band gap voltage reference that provides a precise 10.00 V output specified for the 55C to +125C range. All grades are from an unregulated input level ranging from 12 V to 30 V. packaged in a hermetically sealed 3-pin TO-5 metal can. Laser wafer trimming (LWT) is used to trim both the initial error at +25C as well as the temperature coefficient, resulting PRODUCT HIGHLIGHTS in high precision performance previously available only in expen- 1. Laser trimming of both initial accuracy and temperature sive hybrids or oven regulated modules. The 5 mV initial error coefficient results in very low errors over temperature tolerance and 5 ppm/C guaranteed temperature coefficient of without the use of external components. The AD581L has the AD581L is available in a monolithic voltage reference. a maximum deviation from 10.000 V of 7.25 mV from 0C to 70C, whereas the AD581U guarantees 15 mV The band gap circuit design used in the AD581 offers several advantages over classical Zener breakdown diode techniques. maximum total error without external trims from 55C Most important, no external components are required to to +125C. achieve full accuracy and significant stability to low power 2. Because the laser trimming is done on the wafer prior to systems. In addition, total supply current to the device, separation into individual chips, the AD581 is extremely valuable to hybrid designers for its ease of use, lack of including the output buffer amplifier (which can supply up to 10 mA) is typically 750 A. The long-term stability of the required external trims, and inherent high performance. band gap design is equivalent to selected Zener reference 3. The AD581 can also be operated in a 2-pin Zener mode to diodes. provide a precision 10 V reference with just one external resistor to the unregulated supply. The performance in this The AD581 is recommended for use as a reference for 8-, 10- mode is nearly equal to that of the standard 3-pin confi- or 12-bit digital-to-analog converters (DACs) that require an guration. external precision reference. The device is also ideal for all types 4. Advanced circuit design using the band gap concept allows of analog-to-digital converters (ADCs) up to 14-bit accuracy, the AD581 to give full performance with an unregulated either successive approximation or integrating designs, and can input voltage down to 13 V. With an external resistor, the generally offer better performance than that provided by standard device operates with a supply as low as 11.4 V. self-contained references. 5. The AD581 is available in versions compliant with MILSTD-883. Refer to the military datasheet for detailed specifications. Rev. C 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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All rights reserved. 08014-001AD581 TABLE OF CONTENTS Features .............................................................................................. 1 Output Current Characteristics ...................................................7 Functional Block Diagram .............................................................. 1 Dynamic Performance ..................................................................7 General Description ......................................................................... 1 Precision High Current Supply ...................................................8 Product Highlights ........................................................................... 1 Connection for Reduced Primary Supply ..................................8 Revision History ............................................................................... 2 The AD581 as a Current Limiter .....................................................9 Specif ications ..................................................................................... 3 Negative 10 V Reference ...............................................................9 Absolute Maximum Ratings ............................................................ 5 10 V Reference with Multiplying CMOS DACs or ADCs .......9 ESD Caution .................................................................................. 5 Precision 12-Bit DAC Reference .................................................9 Applying the AD581 ......................................................................... 6 Outline Dimensions ........................................................................ 11 Voltage Variation vs. Temperature ............................................. 6 Ordering Guide ........................................................................... 11 REVISION HISTORY 4/09Rev. B to Rev. C Updated Format .................................................................. Universal Changes to Table 1 ............................................................................ 3 Changes to Figure 2 .......................................................................... 6 Changes to Figure 11 ........................................................................ 8 Changes to 10 V Reference with Multiplying CMOS DACs or ADCs Section ............................................................................... 9 Changes to Precision 12-Bit DAC Reference Section .................. 9 Changes to Figure 13 ........................................................................ 9 Changes to Figure 15 and Figure 16 ............................................. 10 Updated Outline Dimensions ....................................................... 11 Changes to Ordering Guide .......................................................... 11 Rev. C Page 2 of 12