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- erwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 www.analog.com fax: 781/326-8703 ? 2004 analog devices, inc. all rights reserved. ad589 2-terminal ic 1.2 v reference features superior replacement for other 1.2 v references wide operating range: 50 a to 5 ma low power: 60 w total p d at 50 a low temperature coeff cient: 10 ppm/ c max, 0 c to 70 c (ad589m) 2-terminal zener operation low output impedance: 0.6 no frequency compensation required low cost mil-std-883 compliant versions available functional block diagrams product description the ad589 is a 2-terminal, low cost, temperature compensated band gap voltage reference that provides a f xed 1.23 v output voltage for input currents between 50 a and 5.0 ma. the high stability of the ad589 is primarily dependent upon the matching and thermal tracking of the on-chip components. analog devices precision bipolar processing and thin-f lm tech- nology combine to provide excellent performance at low cost. additionally, the active circuit produces an output impedance 10 lower than the typical low-tc zener diodes. this feature allows operation with no external components required to maintain full accuracy under changing load conditions. the ad589 is available in seven versions. the ad589j, ad589k, ad589l, and ad589m grades are specif ed for 0c to +70c operation, while the ad589s and ad589t grades are rated for the full C55c to +125c temperature range. all grades are avail- able in a metal can (h-02) package. the ad589j is also available in an 8-lead soic package. product highlights 1. the ad589 is a 2-terminal device that delivers a constant reference voltage for a wide range of input current. 2. output impedance of 0.6 and temperature coeff cients as low as 10 ppm/c ensure stable output voltage over a wide range of operating conditions. 3. the ad589 can be operated as a positive or negative refer- ence. floating operation is also possible. 4. the ad589 will operate with a total current as low as 50 a (60 w total power dissipation), ideal for battery-powered instrument applications. 5. the ad589 is an exact replacement for other 1.2 v references, offering superior temperature performance and reduced sensi- tivity to capacitive loading. 6. the ad589 is available in versions compliant with mil- std-883. consult factory for 883 data sheet. soic (r-8) a d 5 8 9 t o p v i e w ( n o t t o s c a l e ) 1 2 3 C v 4 + v 8 7 6 5 metal can (h-02) ? ? ? ? ? ? ? ? ? ? ? ? ? ? rev. c
C2 C ad589Cspecifications (typical @ i in = 500 a and t a = 25 c, unless otherwise noted.) ad589jh/ model ad589jr ad589kh ad589lh ad589mh min typ max min typ max min typ max min typ max unit output voltage, t a = 25c 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 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 coefficient 1 100 50 25 10 ppm/c turn-on settling time to 0.1% 25 25 25 25 s operating current 2 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 option 3 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 a = 25c 1.200 1.235 1.250 1.200 1.235 1.250 v 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 coefficient 1 100 50 ppm/c turn-on settling time to 0.1% 25 25 s operating current 2 0.05 5 0.05 5 ma operating temperature C55 +125 C55 +125 c package option 3 metal can (h-02) ad589sh ad589th soic (r-8) ad589jr notes 1 see the voltage variation versus temperature section for explanation of temperature coeff cient measurement method. 2 optimum 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. 3 h = hermetic metal can; r = soic. specif cations shown in boldface are tested on all production units at f nal electrical test. specif cations subject to change without notice. rev. c
ad589 C3 C 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. absolute maximum ratings current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ma reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ma power dissipation * . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 mw storage temperature . . . . . . . . . . . . . . . . . . . . C65c to +175c operating junction temperature range . . . . . . C55c to +150c lead temperature (soldering, 10 sec) . . . . . . . . . . . . . . . . 300c * absolute maximum power dissipation is limited by maximum current through the device. maximum rating at elevated temperatures must be computed assuming t j t j t 150c and ja = 400 = c/w. ad589 chip dimensions and pad layout ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ordering guide temperature no. of parts per temperature model coeff 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 C55 to +125 ad589sh/883b 100 metal can (to-51) h-02 100 C55 to +125 ad589th 50 metal can (to-51) h-02 100 C55 to +125 ad589th/883b 50 metal can (to-51) h-02 100 C55 to +125 ad589tchips 50 dice 25 C55 to +125 * z = pb-free part rev. c
ad589 C4 C understanding the specifications voltage variation versus temperature some confusion exists in the area of def ning and specifying reference voltage error over temperature. historically, references have been characterized using a maximum deviation per degree centigrade, i.e., 10 ppm/c. however, because of nonlinearities in temperature characteristics, which originated in standard zener references (such as s type characteristics), most manufacturers have begun to use a maximum limit error band approach to specify devices. this technique involves measurement of the output at 3, 5, or more different temperatures to guarantee that the output voltage will fall within the given error band. the temperature characteristics of the ad589 consistently follows the curve shown in figure 1. three-point measurement guarantees the error band over the specif ed temperature range. the temperature coeff cients specif ed in the specif cations section represent the slopes of the diagonals of the error band from 25c to t min and 25c to t max . ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 1. typical ad589 temperature characteristics ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 2. noise spectral density dynamic performance many low power instrument manufacturers are becoming increas- ingly concerned with the turn-on characteristics of the components being used in their systems. fast turn-on components often enable the end user to keep power off when not needed and yet respond quickly when the power is turned on for operation. figure 3 dis- plays the turn-on characteristics of the ad589. this characteristic is generated from cold-start operation and represents the true turn- on waveform after an extended period with the supplies off. the f gure shows both the coarse and f ne transient characteristics of the device; the total settling time to within 1 mv is about 25 m s, and there is no long thermal tail appearing after that point. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 3. output s et tling characteristics ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 4. schematic diagram rev. c
ad589 C5 C 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- f guration for an output voltage of 1.2 v or less. note that no frequency compensation is required. if additional f ltering is desired for ultralow noise applications, minimum recommended capacitance is 1000 pf. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 5. basic conf 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. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 6. single-supply buffered 10 v reference the low power operation of the ad589 makes it ideal for use in 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. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? a. with 7109 12-bit binary adc ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 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 C1.0 v reference to an ad7533. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? w ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 8. ad589 as reference for 10-bit cmos dac rev. c
ad589 C6 C outline dimensions 8-lead standard small outline package [soic] narrow body (r-8) dimensions shown in millimeters and (inches) 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 8 5 4 1 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bs c 6.20 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarit y 0.10 controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents fo r reference only and are not appropriate for use in design compliant to jedec standards ms-012aa 2-pin metal header package [to-51] (h-02) dimensions shown in inches and (millimeters) controlling dimensions are in inches; millimeters dimensions (in parentheses) are rounded-off equivalents for reference only and are not appropriate for use in desig n 0.10 (2.54) 45 0.500 (12.7) min dia 0.195 (4.95) 0.178 (4.52) 0.048 (1.22) 0.028 (0.71) 0.046 (1.17) 0.036 (0.91) dia 0.230 (5.84) 0.209 (5.31) 0.150 (3.81) 0.125 (3.17) 0.019 (0.48) 0.015 (0.38) rev. c
ad589 C7 C 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
c00532C0C2/04(c) C8 C
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