2-Terminal IC 1.2 V Reference AD589 FEATURES FUNCTIONAL BLOCK DIAGRAMS Superior Replacement for Other 1.2 V References Wide Operating Range: 50 A to 5 mA SOIC (R-8) Metal Can (H-02) Low Power: 60 W Total P at 50 A D Low Temperature Coeffi cient: �� 10 ppm/C Max, 0C to 70C (AD589M) 1 8 +V 2-Terminal Zener Operation 2 7 Low Output Impedance: 0.6  3 6 No Frequency Compensation Required –V 4 5 AD589 Low Cost �� TOPVIEW MIL-STD-883 Compliant Versions Available (NottoScale) ���������� PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS The AD589 is a 2-terminal, low cost, temperature compensated 1. The AD589 is a 2-terminal device that delivers a constant band gap voltage reference that provides a fi xed 1.23 V output reference voltage for a wide range of input current. voltage for input currents between 50 A and 5.0 mA. 2. Output impedance of 0.6  and temperature coeffi cients as The high stability of the AD589 is primarily dependent upon low as 10 ppm/°C ensure stable output voltage over a wide the matching and thermal tracking of the on-chip components. range of operating conditions. Analog Devices’ precision bipolar processing and thin-fi lm tech- 3. The AD589 can be operated as a positive or negative refer- nology combine to provide excellent performance at low cost. ence. Floating operation is also possible. Additionally, the active circuit produces an output impedance 10 4. The AD589 will operate with a total current as low as 50 A lower than the typical low-TC Zener diodes. This feature allows (60 W total power dissipation), ideal for battery-powered operation with no external components required to maintain full instrument applications. accuracy under changing load conditions. 5. The AD589 is an exact replacement for other 1.2 V references, The AD589 is available in seven versions. The AD589J, AD589K, offering superior temperature performance and reduced sensi- AD589L, and AD589M grades are specifi ed for 0°C to +70°C tivity to capacitive loading. operation, while the AD589S and AD589T grades are rated for the full –55°C to +125°C temperature range. All grades are avail- 6. The AD589 is available in versions compliant with MIL- able in a metal can (H-02) package. The AD589J is also available STD-883. Consult factory for 883 data sheet. in an 8-lead SOIC package. REV. C Information furnished by Analog Devices is be lieved to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or oth- One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. erwise under any patent or patent rights of Analog Devices. Trademarks Tel: 781/329-4700 www.analog.com and registered trademarks are the property of their respective owners. Fax: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved.

AD589–SPECIFICATIONS (Typical @ I = 500 A and T = 25C, unless otherwise noted.) IN A AD589JH/ Model AD589JR AD589KH AD589LH AD589MH Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit OUTPUT VOLTAGE, T = 25°C 1.200 1.235 1.250 1.200 1.235 1.250 1.200 1.235 1.250 1.200 1.235 1.250 V A OUTPUT VOLTAGE CHANGE VERSUS CURRENT 50 A to 5 mA 5 5 5 5 mV DYNAMIC OUTPUT IMPEDANCE 0.6 2 0.6 2 0.6 2 0.6 2  RMS NOISE VOLTAGE 10 Hz < f < 10 kHz 5 5 5 5 V TEMPERATURE COEFFICIENT1 100 50 25 10 ppm/°C TURN-ON SETTLING TIME TO 0.1% 25 25 25 25 s OPERATING CURRENT2 0.05 5 0.05 5 0.05 5 0.05 5 mA OPERATING TEMPERATURE 0 70 0 70 0 70 0 70 °C PACKAGE OPTION3 Metal Can (H-02A) AD589JH AD589KH AD589LH AD589MH SOIC (R-8) AD589JR Model AD589SH AD589TH Min Typ Max Min Typ Max Unit OUTPUT VOLTAGE, T = 25°C 1.200 1.235 1.250 1.200 1.235 1.250 V A OUTPUT VOLTAGE CHANGE VERSUS CURRENT 50 A to 5 mA 5 5 mV DYNAMIC OUTPUT IMPEDANCE 0.6 2 0.6 2  RMS NOISE VOLTAGE 10 Hz < f < 10 kHz 5 5 V TEMPERATURE COEFFICIENT1 100 50 ppm/°C TURN-ON SETTLING TIME TO 0.1% 25 25 s OPERATING CURRENT2 0.05 5 0.05 5 mA OPERATING TEMPERATURE –55 +125 –55 +125 °C PACKAGE OPTION3 Metal Can (H-02) AD589SH AD589TH SOIC (R-8) AD589JR NOTES 1See the Voltage Variation versus Temperature section for explanation of temperature coeffi cient measurement method. 2Optimum performance is obtained at currents below 500 A. For current operation below 200 A, stray shunt capacitances should be limited to 20 pF or increased to 1 F. If strays cannot be avoided, operation at 500 A and a shunt capacitor of at least 1000 pF are recommended. 3H = Hermetic Metal Can; R = SOIC. Specifi cations shown in boldface are tested on all production units at fi nal electrical test. Specifi cations subject to change without notice. –2– REV. C

AD589 ABSOLUTE MAXIMUM RATINGS AD589 CHIP DIMENSIONS AND PAD LAYOUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA Reverse Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA Power Dissipation* . . . . . . . . . . . . . . . . . . . . . . . . . . .125 mW Storage Temperature . . . . . . . . . . . . . . . . . . . .–65°C to +175°C Operating Junction Temperature Range . . . . . .–55°C to +150°C Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . . .300°C ����� ������� *Absolute maximum power dissipation is limited by maximum current through the device. Maximum rating at elevated temperatures must be computed assuming TTTJJ 150°C andJA = 400 = C/W. ����� ������� �������������������������������������������� ��������������������������������������������� �������������������������� ORDERING GUIDE Temperature No. of Parts Per Temperature Model Coeffi cient (ppm/C) Package Description Package Option Reel/Tray Range (C) AD589JH 100 Metal Can (TO-51) H-02 100 0 to +70 AD589JR 100 SOIC-8 R-8 98 0 to +70 AD589JRZ* 100 SOIC-8 R-8 98 0 to +70 AD589JR-REEL 100 SOIC-8 R-8 2,500 0 to +70 AD589JRZ-REEL* 100 SOIC-8 R-8 2,500 0 to +70 AD589JCHIPS 100 DICE — 25 0 to +70 AD589KH 50 Metal Can (TO-51) H-02 100 0 to +70 AD589LH 25 Metal Can (TO-51) H-02 100 0 to +70 AD589MH 10 Metal Can (TO-51) H-02 100 0 to +70 AD589SH 100 Metal Can (TO-51) H-02 100 –55 to +125 AD589SH/883B 100 Metal Can (TO-51) H-02 100 –55 to +125 AD589TH 50 Metal Can (TO-51) H-02 100 –55 to +125 AD589TH/883B 50 Metal Can (TO-51) H-02 100 –55 to +125 AD589TCHIPS 50 DICE — 25 –55 to +125 *Z = Pb-free part CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily ac cu mu late on the human body and test equipment and can discharge without detection. Although the AD589 features proprietary ESD pro tec tion circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD pre cau tions are rec om mend ed to avoid per for mance deg ra da tion or loss of functionality. REV. C –3–

AD589 UNDERSTANDING THE SPECIFICATIONS Dynamic Performance Voltage Variation Versus Temperature Many low power instrument manufacturers are becoming increas- Some confusion exists in the area of defi ning and specifying ingly concerned with the turn-on characteristics of the components reference voltage error over temperature. Historically, references being used in their systems. Fast turn-on components often enable have been characterized using a maximum deviation per degree the end user to keep power off when not needed and yet respond Centigrade, i.e., 10 ppm/°C. However, because of nonlinearities quickly when the power is turned on for operation. Figure 3 dis- in temperature characteristics, which originated in standard Zener plays the turn-on characteristics of the AD589. This characteristic references (such as S type characteristics), most manufacturers is generated from cold-start operation and represents the true turn- have begun to use a maximum limit error band approach to specify on waveform after an extended period with the supplies off. The devices. This technique involves measurement of the output at fi gure shows both the coarse and fi ne transient characteristics of 3, 5, or more different temperatures to guarantee that the output the device; the total settling time to within ±1 mV is about 25 s, voltage will fall within the given error band. The temperature and there is no long thermal tail appearing after that point. characteristics of the AD589 consistently follows the curve shown in Figure 1. Three-point measurement guarantees the error band over the specifi ed temperature range. The temperature coeffi cients ����� ���� ���� specifi ed in the Specifi cations section represent the slopes of the ��� �� diagonals of the error band from 25°C to T and 25°C to T . MIN MAX ������ ������ �� �� �� � � � ������� � � � � Figure 3. Output Settling Characteristics � �������� � � �� � �� �� �� ������ �� ������ �� ��� ��� � �� �� �� ��� ��� ��������������� �� �� �� �� �� �� Figure 1. Typical AD589 Temperature Characteristics �� ���� �� �� �� �� ��� �� �� � ���� Figure 4. Schematic Diagram � � �� � � � � � � � � �� � � � � � �� � � �� �� �� ��� ���� � ������������� Figure 2. Noise Spectral Density –4– REV. C

AD589 APPLICATION INFORMATION �� The AD589 functions as a 2-terminal shunt-type regulator. It ����� provides a constant 1.23 V output for a wide range of input current from 50 A to 5 mA. Figure 5 shows the simplest con- ����� �� ���� fi guration for an output voltage of 1.2 V or less. Note that no ����� ��� ���� frequency compensation is required. If additional fi ltering is ���� desired for ultralow noise applications, minimum recommended capacitance is 1000 pF. ������ �� ����� a. With 7109 12-Bit Binary ADC �� ����� ���� ����� ���� �� ���� ���� ����� Figure 5. Basic Confi guration for 1.2 V or Less ��� ����� The AD589 can also be used as a building block to generate ����� other values of reference voltage. Figure 6 shows a circuit that ������ produces a buffered 10 V output. Total supply current for this circuit is approximately 2 mA. ����� b. With 7107 Panel Meter ADC ��� Figure 7. AD589 Used as Reference for CMOS ADCs The AD589 also is useful as a reference for CMOS multiplying ���� � � DACs, such as the AD7533. These DACs require a negative ������ � reference voltage in order to provide a positive output range. � � ��� Figure 8 shows the AD589 used to supply an equivalent –1.0 V � � ��� reference to an AD7533. ������ ��� ��� ��� � � � � � � � � � �� ��� ��� ����� ��� ����� ���� �� ��� ������������ Figure 6. Single-Supply Buffered 10 V Reference �� �� The low power operation of the AD589 makes it ideal for use in �� ��� ��� ���W � battery-operated portable equipment. It is especially useful as a � � �� reference for CMOS analog-to-digital converters. Figure 7 shows ���� the AD589 used in conjunction with two popular integrating type ���� ���� ��� CMOS ADCs. ����� �������� ������ Figure 8. AD589 as Reference for 10-Bit CMOS DAC REV. C –5–

AD589 OUTLINE DIMENSIONS 8-Lead Standard Small Outline Package [SOIC] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 5.00 (0.1968) 4.80 (0.1890) 8 5 4.00 (0.1574) 6.20 (0.2440) 3.80 (0.1497) 1 4 5.80 (0.2284) 1.27 (0.0500) 0.50 (0.0196) BSC 1.75 (0.0688) 0.25 (0.0099) 45 0.25 (0.0098) 1.35 (0.0532) 0.10 (0.0040) 0.51 (0.0201) 8 COPLANARITY 0.31 (0.0122) 0.25 (0.0098)0 1.27 (0.0500) 0.10 SEPALTAINNGE 0.17 (0.0067) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN 2-Pin Metal Header Package [TO-51] (H-02) Dimensions shown in inches and (millimeters) 0.230 (5.84) DIA 0.209 (5.31) 0.10 (2.54) 0.195 (4.95)DIA 0.150 (3.81) 0.178 (4.52) 0.125 (3.17) 45° 0.048 (1.22) 0.028 (0.71) 0.500 (12.7) 0.019 (0.48) MIN 0.046 (1.17) 0.015 (0.38) 0.036 (0.91) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETERS DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN –6– REV. C

AD589 Revision History Location Page 2/04 —Data Sheet changed from REV. B to REV. C Changes to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Changes to PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Changes to PRODUCT HIGHLIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Added ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 REV. C –7–

C) 4( 0 2/ – 0 – 2 3 5 0 0 C –8–