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high precision 10 v reference ad587 rev. h 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 rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise 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: 781.461.3113 ?1998C2007 analog devices, inc. all rights reserved. features laser trimmed to high accuracy 10.000 v 5 mv (u grade) trimmed temperature coefficient 5 ppm/c maximum (u grade) noise-reduction capability low quiescent current: 4 ma maximum output trim capability mil-std-883-compliant versions available functional block diagram 8 2 6 4 5 r t r i ad587 a1 +v in noise reduction v out trim gnd note pin 1, pin 3, and pin 7 are internal test points. no connections to these points. r f r s 00530-001 figure 1. general description the ad587 represents a major advance in state-of-the-art monolithic voltage references. using a proprietary ion- implanted buried zener diode and laser wafer trimming of high stability thin-film resistors, the ad587 provides outstanding performance at low cost. the ad587 offers much higher performance than most other 10 v references. because the ad587 uses an industry-standard pinout, many systems can be upgraded instantly with the ad587. the buried zener approach to reference design provides lower noise and drift than band gap voltage references. the ad587 offers a noise-reduction pin that can be used to further reduce the noise level generated by the buried zener. the ad587 is recommended for use as a reference for 8-bit, 10-bit, 12-bit, 14-bit, or 16-bit dacs that require an external precision reference. the device is also ideal for successive approximation or integrating adcs with up to 14 bits of accuracy. in general, it offers better performance than standard on-chip references. the ad587j and ad587k are specified for operation from 0c to 70c, and the ad587u is specified for operation from ?55c to +125c. the ad587jq and ad587uq models are available in 8-lead cerdip. other models are available in an 8-lead soic package for surface-mount applications, or in an 8-lead pdip. product highlights 1. laser trimming of both initial accuracy and temperature coefficients. this laser trimming results in very low errors over temperature without the use of external components. the ad587u guarantees 14 mv maximum total error between ?55c and +125c. 2. optional fine trim connection. this connection is designed for applications requiring higher precision. 3. instant upgrade of any system using an industry-standard pinout 10 v reference. 4. very low output noise. ad587 output noise is typically 4 v p-p. a noise-reduction pin is provided for additional noise filtering using an external capacitor. 5. mil-std-883-compliant versions available. refer to the analog devices military/aerospace reference manual for detailed specifications.
ad587 rev. h | page 2 of 12 table of contents features .............................................................................................. 1 functional block diagram .............................................................. 1 general description ......................................................................... 1 product highlights ........................................................................... 1 revision history ............................................................................... 2 specifications..................................................................................... 3 absolute maximum ratings............................................................ 4 esd caution.................................................................................. 4 pin configuration and function descriptions............................. 5 theory of operation ........................................................................ 6 applying the ad587 .................................................................... 6 noise performance and reduction .............................................6 turn-on time ...............................................................................7 dynamic performance..................................................................7 load regulation ............................................................................8 temperature performance............................................................8 negative reference voltage from an ad587 .............................9 applications information .............................................................. 10 using the ad587 with converters........................................... 10 outline dimensions ....................................................................... 11 ordering guide .......................................................................... 12 revision history 9/07rev. g to rev. h deleted ad587l grade ..................................................... universal change to product highlights .........................................................1 changes to the negative reference voltage from an ad587 section ..............................................................................9 changes to figure 19.......................................................................10 changes to figure 21 and figure 22..............................................10 updated outline dimensions ........................................................11 changes to ordering guide ...........................................................12 4/05rev. f to rev. g updated format.................................................................. universal added table 3.....................................................................................5 updated outline dimensions ........................................................11 changes to ordering guide ...........................................................13 7/04rev. e to rev. f changes to ordering guide .............................................................3 7/03rev. d to rev. e. deletion of s and t grades ............................................... universal edits to ordering guide ...................................................................2 deletion of die specifications .........................................................3 edits to figure 3.................................................................................4 updated outline dimensions..........................................................9
ad587 rev. h | page 3 of 12 specifications t a = 25c, v in = 15 v, unless otherwise noted. table 1. ad587j ad587k ad587u parameter min typ max min typ max min typ max unit output voltage 9.990 10.010 9.995 10.005 9.995 10.005 v output voltage drift 1 0c to 70c 20 10 5 ppm/c ?55c to +125c 20 10 5 ppm/c gain adjustment +3 +3 +3 % ?1 ?1 ?1 % line regulation 1 13.5 v +v in 36 v t min to t max 100 100 100 v/v load regulation 1 sourcing 0 ma < i out < 10 ma t min to t max 100 100 100 v/ma sourcing ?10 ma < i out < 0 ma 2 t min to t max 100 100 100 v/ma quiescent current 2 4 2 4 2 4 ma power dissipation 30 30 30 mw output noise 0.1 hz to 10 hz 4 4 4 v p-p spectral density, 100 hz 100 100 100 nv/hz long-term stability 15 15 15 ppm/1000 hr short-circuit current-to-ground 30 70 30 70 30 70 ma short-circuit current-to-+v in 30 70 30 70 30 70 ma temperature range specified performance (j, k) 0 70 0 70 0 70 c operating performance (j, k) 3 ?40 +85 ?40 +85 ?40 +85 c specified performance (u) ?55 +125 ?55 +125 ?55 +125 c operating performance (u) 3 ?55 +125 ?55 +125 ?55 +125 c 1 specification is guaranteed for al l packages and grades. cerdip-packaged parts are 100% production tested. 2 load regulation (sinking ) specification for soic (r -8) package is 200 v/ma. 3 the operating temperature range is define d as the temperature extremes at which the device will still function. parts may devi ate from their specified performance outside their specified temperature range.
ad587 rev. h | page 4 of 12 absolute maximum ratings table 2. parameter rating +v in to ground 36 v power dissipation (25c) 500 mw storage temperature range ?65c to +150c lead temperature (soldering, 10 sec) 300c package thermal resistance jc 22c/w ja 110c/w output protection short to ground indefinite 1 short to +v in momentary 1 1 period for which output is safe. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution
ad587 rev. h | page 5 of 12 pin configuration and fu nction descriptions 1 2 3 4 8 7 6 5 ad587 top view (not to scale) trim v out tp* noise reduction +v in gnd tp* tp* *tp denotes factory test point. no connections should be made to these pins. 00530-002 figure 2. pin configuration table 3. pin function descriptions pin no. mnemonic description 1, 3, 7 tp no connection. leave floating. 2 +v in input voltage. 4 gnd ground. 5 trim fine trimming of output voltage. see figure 4 . 6 v out output voltage. 8 noise reduction noise reduction of output voltage. reduces noise via external capacitor to ground.
ad587 rev. h | page 6 of 12 theory of operation the ad587 consists of a proprietary buried zener diode reference, an amplifier to buffer the output, and several high stability thin-film resistors, as shown in figure 3 . this design results in a high precision monolithic 10 v output reference with initial offset of 5 mv or less. the temperature-compensa- tion circuitry provides the device with a temperature coefficient of less than 5 ppm/c. 8 2 6 4 5 r t r i ad587 a1 +v in noise reduction v out trim gnd note pin 1, pin 3, and pin 7 are internal test points. no connections to these points. r f r s 00530-003 figure 3. functional block diagram a capacitor can be added at the noise reduction pin (pin 8) to form a low-pass filter with r s to reduce the noise contribution of the zener to the circuit. applying the ad587 the ad587 is simple to use in virtually all precision reference applications. when power is applied to pin 2 and pin 4 is grounded, pin 6 provides a 10 v output. no external compo- nents are required; the degree of desired absolute accuracy is achieved simply by selecting the required device grade. the ad587 requires less than 4 ma quiescent current from an operating supply of 15 v. fine trimming may be desired to set the output level to exactly 10.000 v (calibrated to a main system reference). system cali- bration may also require a reference voltage that is slightly different from 10.000 v, for example, 10.24 v for binary applications. in either case, the optional fine-trimming circuit shown in figure 4 can offset the output by as much as 300 mv with minimal effect on other device characteristics. 8 2 6 4 gnd 5 ad587 noise reduction trim 10k ? output optional noise- reduction capacitor c n 1f + v in v out v in 00530-004 figure 4. optional fine -trimming configuration noise performance and reduction noise generated by the ad587 is typically less than 4 v p-p over the 0.1 hz to 10 hz band. noise in a 1 mhz bandwidth is approximately 200 v p-p. the dominant source of this noise is the buried zener, contributing approximately 100 nv/hz. by comparison, the contribution of the op amp is negligible. figure 5 shows the 0.1 hz to 10 hz noise of a typical ad587. the noise measurement is made with a band-pass filter made of a 1-pole high-pass filter with a corner frequency at 0.1 hz and a 2-pole low-pass filter with a corner frequency at 12.6 hz to create a filter with a 9.922 hz bandwidth. 1v 5s 100 90 10 0% 1v 0 0530-005 figure 5. 0.1 hz to 10 hz noise if further noise reduction is desired, an external capacitor can be added between the noise reduction pin and ground, as shown in figure 4 . this capacitor, combined with the 4 k r s and the zener resistances, forms a low-pass filter on the output of the zener cell. a 1 f capacitor has a 3 db point at 40 hz and reduces the high frequency (up to 1 mhz) noise to about 160 v p-p. figure 6 shows the 1 mhz noise of a typical ad587, both with and without a 1 f capacitor. 100 0% 200v 50s 90 10 no c n c n ? 1f 00530-006 figure 6. effect of 1 f noise-re duction capacitor on broadband noise
ad587 rev. h | page 7 of 12 turn-on time upon application of power (cold start), the time required for the output voltage to reach its final value within a specified error band is defined as the turn-on settling time. two compo- nents normally associated with this are the time for the active circuits to settle and the time for the thermal gradients on the chip to stabilize. figure 7 , figure 8 , and figure 9 show the turn- on characteristics of the ad587. these figures show the settling to be about 60 s to 0.01%. note the absence of any thermal tails when the horizontal scale is expanded to 1 ms/cm in figure 8 . output turn-on time is modified when an external noise reduc- tion capacitor is used. when present, this capacitor acts as an additional load to the current source of the internal zener diode, resulting in a somewhat longer turn-on time. in the case of a 1 f capacitor, the initial turn-on time is approximately 400 ms to 0.01%, as shown in figure 9 . 100 10 0% 10v 1mv 90 +v in v out 20s 00530-007 figure 7. electrical turn-on 100 90 10 0% 10v 1ms 20v +v in v out 0 0530-008 figure 8. extended time scale 100 90 10 0% 1v 100ms 10v +v in v out 00530-009 figure 9. turn-on with 1 f c n dynamic performance the output buffer amplifier is designed to provide the ad587 with static and dynamic load regulation that is superior to less complete references. many adcs and dacs present transient current loads to the reference, and poor reference response can degrade the con- verters performance. figure 11 and figure 12 display the characteristics of the ad587 output amplifier driving a 0 ma to 10 ma load. 00530-010 ad587 v out 7.0v 1k? 10v 0v v l figure 10. transient load test circuit 100 90 10 0% 50mv 1s 10v v l v out 0 0530-011 figure 11. large-scale transient response
ad587 rev. h | page 8 of 12 100 90 10 0% 1mv 2s 10v v l v out 00530-012 figure 12. fine-scale se tting for transient load in some applications, a varying load may be both resistive and capacitive in nature, or the load may be connected to the ad587 by a long capacitive cable. figure 14 displays the output amplifier characteristics driving a 1000 pf, 0 ma to 10 ma load. ad587 v out 7.0v 1k? v l 10v 0v c l 1000pf 00530-013 figure 13. capacitive load transient/response test circuit 100 90 10 0% 200mv 1s 10v c l = 0 c l = 1000pf v l 00530-014 figure 14. output response with capacitive load load regulation the ad587 has excellent load regulation characteristics. figure 15 shows that varying the load several milliamperes changes the output by only a few microvolts. ?6 ?4 ?2 0 ?500 ?1000 500 1000 v out (v) load (ma) 24 6810 00530-015 figure 15. typical load regulation characteristics temperature performance the ad587 is designed for precision reference applications where temperature performance is critical. extensive tempera- ture testing ensures that the devices high level of performance is maintained over the operating temperature range. some confusion exists in the area of defining and specifying reference voltage error over temperature. historically, references have been characterized using a maximum deviation per degree celsius, such as ppm/c. however, because of nonlinearities in temperature characteristics that 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 the measurement of the output at three or more temperatures to specify an output voltage error band.
ad587 rev. h | page 9 of 12 each ad587j and ad587k grade unit is tested at 0c, 25c, and 70c. each ad587u grade unit is tested at ?55c, +25c, and +125c. this approach ensures that the variations of the output voltage that occur as the temperature changes within the specified range are contained within a box whose diagonal has a slope equal to the maximum specified drift. the position of the box on the vertical scale changes from device to device as initial error and the shape of the curve vary. the maximum height of the box for the appropriate temperature range and device grade is shown in figure 16 . duplication of these results requires a combination of high accuracy and stable temperature control in a test system. device grade ad587j a d587k a d587u 14.00 7.00 9.00 0 to +70c ?55c to +125c maximum output change ? mv 00530-017 figure 16. maximum output change in millivolts negative reference voltage from an ad587 the ad587 can be used as shown in figure 17 to provide a precision ?10.000 v output. the +v in pin is tied to at least a +3.5 v supply, the output pin is grounded, and the ad587 ground pin is connected through a resistor (r s ) to a ?15 v supply. the ?10 v output is taken from the ground pin (pin 4) instead of v out . it is essential to arrange the output load and the supply resistor (r s ) so that the net current through the ad587 is between 2.5 ma and 10.0 ma (r s should be kept below 1 k). the temperature characteristics and long-term stability of the device is essentially the same as that of a unit used in the standard 10 v output configuration. 2 6 4 gnd ad587 3.5v 26 v 1n f r s ?15v ?10v +v in v out i l 2.5ma < 5v r s ? i l < 10ma 00530-018 figure 17. ad587 as a negative 10 v reference
ad587 rev. h | page 10 of 12 applications information using the ad587 with converters the ad587 is an ideal reference for a variety of 8-bit, 12-bit, 14-bit, and 16-bit adcs and dacs. several examples follow. 10 v reference with multiplying cmos dacs or adcs the ad587 is ideal for applications with 10-bit and 12-bit multiplying cmos dacs. in the standard hookup, shown in figure 18 , the ad587 is paired with the ad7545 12-bit multi- plying dac and the ad711 high speed bifet op amp. the amplifier dac configuration produces a unipolar 0 v to ?10 v output range. bipolar output applications and other operating details can be found in the individual product data sheets. ad587 gnd ad711 ?15v +15v out1 dgnd db11 to db0 c1 33pf r2 +15v ad7545 trim +15 v +v in v out 0.1f v ref v dd r fb agnd 0.1f 0.1f v out 0v to ?10v 00530-019 10k ? figure 18. low power 12-bit cmos dac application the ad587 can also be used as a precision reference for multi- ple dacs. figure 19 shows the ad587, the ad7628 dual dac, and the ad712 dual op amp hooked up for single-supply operation to produce 0 v to ?10 v outputs. because both dacs are on the same die and share a common reference and output op amps, the dac outputs will exhibit similar gain temperature coefficients (tcs). ad587 gnd ad712 +15v out a dgnd +15v agnd dac a db0 db7 out b dac b 18 rfb b rfb a ad7628 +v in v out 0.1f data inputs v ref a v ref b v out a = 0 to ?10v v out b = 0 to ?10v 0 0530-020 figure 19. ad587 as a 10 v reference for a cmos dual dac precision current source the design of the ad587 allows it to be easily configured as a cur- rent source. by choosing the control resistor (r c ) via the equation shown in figure 20 , the user can vary the load current from the quiescent current (2 ma typically) to approximately 10 ma. 2 6 4 gnd ad587 + v in +v in v out i l = + i bias 10v r c r c 500? min 00530-021 figure 20. precision current source precision high current supply for higher currents, the ad587 can easily be connected to a power pnp or power darlington pnp device. the circuits in figure 21 and figure 22 can deliver up to 4 a to the load. the 0.1 f capacitor is required only if the load has a significant capacitive component. if the load is purely resistive, improved high frequency supply rejection results can be obtained by removing the capacitor. ad587 2 6 4 2n6285 r c v out i l = + i bias 10v r c 00530-022 +v in 0.1f + v in 220? gnd figure 21. precision high current source ad587 2 6 4 2n6285 v out +v in 0.1f + v in 220 ? v out +10v @ 4a 00530-023 gnd figure 22. precision high current voltage source
ad587 rev. h | page 11 of 12 outline dimensions 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. compliant to jedec standards ms-012-a a 012407-a 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) 4 1 85 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2441) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 figure 23. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) compliant to jedec standards ms-001 controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. corner leads may be configured as whole or half leads. 070606-a 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) seating plane 0.015 (0.38) min 0.210 (5.33) max 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 8 1 4 5 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.100 (2.54) bsc 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 0.060 (1.52) max 0.430 (10.92) max 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) gauge plane 0.005 (0.13) min figure 24. 8-lead plastic dual in-line package [pdip] narrow body (n-8) dimensions shown in inches and (millimeters) controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. 0.310 (7.87) 0.220 (5.59) 0.005 (0.13) min 0.055 (1.40) max 0.100 (2.54) bsc 15 0 0.320 (8.13) 0.290 (7.37) 0.015 (0.38) 0.008 (0.20) seating plane 0.200 (5.08) max 0.405 (10.29) max 0.150 (3.81) min 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.070 (1.78) 0.030 (0.76) 0.060 (1.52) 0.015 (0.38) 14 5 8 figure 25. 8-lead ceramic dual in-line package [cerdip] (q-8) dimensions shown in inches and (millimeters)
ad587 rev. h | page 12 of 12 ordering guide model initial error temperature coefficient temp erature range package description package option ad587jq 10 mv 20 ppm/c 0c to 70c 8-lead cerdip q-8 ad587jr 10 mv 20 ppm/c 0c to 70c 8-lead soic_n r-8 ad587jr-reel 10 mv 20 ppm/c 0c to 70c 8-lead soic_n r-8 ad587jr-reel7 10 mv 20 ppm/c 0c to 70c 8-lead soic_n r-8 ad587jrz 1 10 mv 20 ppm/c 0c to 70c 8-lead soic_n r-8 ad587jrz-reel 1 10 mv 20 ppm/c 0c to 70c 8-lead soic_n r-8 ad587jrz-reel7 1 10 mv 20 ppm/c 0c to 70c 8-lead soic_n r-8 ad587jn 10 mv 20 ppm/c 0c to 70c 8-lead pdip n-8 ad587jnz 1 10 mv 20 ppm/c 0c to 70c 8-lead pdip n-8 ad587kr 5 mv 10 ppm/c 0c to 70c 8-lead soic_n r-8 ad587kr-reel 5 mv 10 ppm/c 0c to 70c 8-lead soic_n r-8 ad587kr-reel7 5 mv 10 ppm/c 0c to 70c 8-lead soic_n r-8 ad587krz 1 5 mv 10 ppm/c 0c to 70c 8-lead soic_n r-8 ad587krz-reel 1 5 mv 10 ppm/c 0c to 70c 8-lead soic_n r-8 ad587krz-reel7 1 5 mv 10 ppm/c 0c to 70c 8-lead soic_n r-8 ad587kn 5 mv 10 ppm/c 0c to 70c 8-lead pdip n-8 ad587knz 1 5 mv 10 ppm/c 0c to 70c 8-lead pdip n-8 ad587uq 5 mv 5 ppm/c ?55c to +125c 8-lead cerdip q-8 1 z = rohs compliant part. ?1998C2007 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. c00530-0-9/07(h)

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