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2.5 v to 5.0 v micropower, precision series mode voltage references ad1582/ad1583/ad1584/ad1585 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 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 ?1997C2010 analog devices, inc. all rights reserved. features series reference (2.5 v, 3 v, 4.096 v, 5 v) low quiescent current: 70 a maximum current output capability: 5 ma wide supply range: v in = v out + 200 mv to 12 v wideband noise (10 hz to 10 khz): 50 v rms specified temperature range: ?40c to +125c compact, surface-mount sot-23 package applications portable, battery-powered equipment; for example, notebook computers, cellular phones, pagers, pdas, gpss, and dmms computer workstations; suitable for use with a wide range of video ramdacs smart industrial transmitters pcmcia cards automotive hard disk drives 3 v/5 v, 8-bit/12-bit data converters pin configuration v out 1 gnd 2 v in 3 ad1582/ ad1583/ ad1584/ ad1585 top view (not to scale) 0 0701-001 figure 1. 3-lead sot-23-3 (rt suffix) 900 800 700 600 2.7 5 shunt reference 1 ad1582 series reference 200 100 0 500 400 300 i supply (a) v supply (v) 1 3.076k ? source resistor. 00701-002 figure 2. supply current (a) vs. supply voltage (v) general description the ad1582/ad1583/ad1584/ad1585 are low cost, low power, low dropout, precision band gap references. these designs are available as 3-terminal (series) devices and are packaged in the compact sot-23, 3-lead surface-mount package. the versatility of these references makes them ideal for use in battery-powered 3 v or 5 v systems where there can be wide variations in supply voltage and a need to minimize power dissipation. the superior accuracy and temperature stability of the ad1582/ ad1583/ad1584/ad1585 result from the precise matching and thermal tracking of on-chip components. patented temperature drift curvature correction design techniques minimize the nonlinearities in the voltage output temperature characteristic. the ad1582/ad1583/ad1584/ad1585 series mode devices source or sink up to 5 ma of load current and operate efficiently with only 200 mv of required headroom supply. these parts draw a maximum 70 a of quiescent current with only a 1.0 a/v variation with supply voltage. the advantage of these designs over conventional shunt devices is extraordinary. valuable supply current is no longer wasted through an input series resistor, and maximum power efficiency is achieved at all input voltage levels. the ad1582/ad1583/ad1584/ad1585 are available in two grades, a and b, and are provided in a tiny footprint, the sot- 23. all grades are specified over the industrial temperature range of ?40c to +125c. table 1. ad158x products, three electrical grades electrical grade initial accuracy temperature coefficient (ppmc) ad1582 ad1583/ad1585 ad1584 b 0.08% 0.10% 0.10% 50 a 0.80% 1.00% 0.98% 100
ad1582/ad1583/ad1584/ad1585 rev. i | page 2 of 16 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? pin configuration ............................................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? ad1582 specifications ................................................................. 3 ? ad1583 specifications ................................................................. 4 ? ad1584 specifications ................................................................. 5 ? ad1585 specifications ................................................................. 6 ? absolute maximum ratings ............................................................ 7 ? esd caution .................................................................................. 7 ? terminology ...................................................................................... 8 ? typical performance characteristics ............................................. 9 ? theory of operation ...................................................................... 10 ? applications information .............................................................. 11 ? temperature performance......................................................... 11 ? voltage output nonlinearity vs. temperature ....................... 11 ? output voltage hysteresis ......................................................... 12 ? supply current vs. temperature ............................................... 12 ? supply voltage ............................................................................ 12 ? ac performance ......................................................................... 12 ? noise performance and reduction .......................................... 13 ? turn-on time ............................................................................ 13 ? dynamic performance ............................................................... 14 ? outline dimensions ....................................................................... 15 ? ordering guide .......................................................................... 16 ? package branding information ................................................ 16 ? revision history 5/10rev. h to rev. i changes to figure 10 ...................................................................... 11 updated outline dimensions ....................................................... 16 changes to ordering guide .......................................................... 16 11/07rev. g to rev. h deleted c grade ................................................................. universal changes to voerr parameter ....................................................... 3 changes to ordering guide .......................................................... 16 6/06rev. f to rev. g changes to features .......................................................................... 1 changes to general description .................................................... 1 2/06rev. e to rev. f updated format .................................................................. universal changes to features .......................................................................... 1 changes to table 6 ............................................................................ 7 changes to ordering guide .......................................................... 16 6/05rev. d to rev. e changes to ordering guide ........................................................... 7 moved package branding section .................................................. 7 6/04rev. c to rev. d changes to ordering guide ............................................................ 6 updated outline dimensions ....................................................... 13 12/02rev. b to rev. c changes to features .......................................................................... 1 changes to general description ..................................................... 1 changes to specifications ................................................................. 2 changes to absolute maximum ratings ........................................ 6 replaced tpc 3 ................................................................................. 8 changes to temperature performance section ............................. 9 replaced figure 4 .............................................................................. 9 changes to output voltage hysteresis section .......................... 10 updated sot-23 package .............................................................. 13 3/97revision 0: initial version
ad1582/ad1583/ad1584/ad1585 rev. i | page 3 of 16 specifications ad1582 specifications t a = t min to t max , v in = 5 v, unless otherwise noted. table 2. ad1582a ad1582b parameter min typ max min typ max unit output voltage (@ 25c) v o 2.480 2.500 2.520 2.498 2.500 2.502 v initial accuracy error (@ 25c) v oerr ?20 +20 ?2 +2 mv ?0.80 +0.80 ?0.08 +0.08 % output voltage temperature drift 100 50 ppm/c temperature coefficient (tcv o ) ?40c < t a < +125c 40 100 18 50 ppm/c 0c < t a < 70c 35 15 ppm/c minimum supply headroom (v in C v out ) 200 200 mv load regulation 0 ma < i out < 5 ma (?40c to +85c) 0.2 0.2 mv/ma 0 ma < i out < 5 ma (?40c to +125c) 0.4 0.4 mv/ma ?5 ma < i out < 0 ma (?40c to +85c) 0.25 0.25 mv/ma ?5 ma < i out < 0 ma (?40c to +125c) 0.45 0.45 mv/ma ?0.1 ma < i out < +0.1 ma (?40c to +85c) 2.7 2.7 mv/ma ?0.1 ma < i out < +0.1 ma (?40c to +125c) 3.5 3.5 mv/ma line regulation v out + 200 mv < v in < 12 v i out = 0 ma 25 25 v/v ripple rejection (v out /v in ) v in = 5 v 100 mv (f = 120 hz) 80 80 db quiescent current 70 70 a short-circuit current to ground 15 15 ma noise voltage (@ 25c) 0.1 hz to 10 hz 70 70 v p-p 10 hz to 10 khz 50 50 v rms turn-on settling time to 0.1% c l = 0.2 f 100 100 s long-term stability 1000 hours @ 25c 100 100 ppm/1000 hr output voltage hysteresis 115 115 ppm temperature range specified performance (a, b, c) ?40 +125 ?40 +125 c operating performance (a, b, c) ?55 +125 ?55 +125 c
ad1582/ad1583/ad1584/ad1585 rev. i | page 4 of 16 ad1583 specifications t a = t min to t max , v in = 5 v, unless otherwise noted. table 3. ad1583a ad1583b parameter min typ max min typ max unit output voltage (@ 25c) v o 2.970 3.000 3.030 2.997 3.000 3.003 v initial accuracy error (@ 25c) v oerr ?30 +30 ?3 +3 mv ?1.0 +1.0 ?0.1 +0.1 % output voltage temperature drift 100 50 ppm/c temperature coefficient (tcv o ) C40c < t a < +125c 40 100 18 50 ppm/c 0c < t a < 70c 35 15 ppm/c minimum supply headroom (v in C v out ) 200 200 mv load regulation 0 ma < i out < 5 ma (C40c to +85c) 0.25 0.25 mv/ma 0 ma < i out < 5 ma (C40c to +125c) 0.45 0.45 mv/ma C5 ma < i out < 0 ma (C40c to +85c) 0.40 0.40 mv/ma C5 ma < i out < 0 ma (C40c to +125c) 0.6 0.6 mv/ma C0.1 ma < i out < +0.1 ma (C40c to +85c) 2.9 2.9 mv/ma C0.1 ma < i out < +0.1 ma (C40c to +125c) 3.7 3.7 mv/ma line regulation v out + 200 mv < v in < 12 v i out = 0 ma 25 25 v/v ripple rejection (v out /v in ) v in = 5 v 100 mv (f = 120 hz) 80 80 db quiescent current 70 70 a short-circuit current to ground 15 15 ma noise voltage (@ 25c) 0.1 hz to 10 hz 85 85 v p-p 10 hz to 10 khz 60 60 v rms turn-on settling time to 0.1% c l = 0.2 f 120 120 s long-term stability 1000 hours @ 25c 100 100 ppm/1000 hr output voltage hysteresis 115 115 ppm temperature range specified performance (a, b, c) ?40 +125 ?40 +125 c operating performance (a, b, c) ?55 +125 ?55 +125 c
ad1582/ad1583/ad1584/ad1585 rev. i | page 5 of 16 ad1584 specifications t a = t min to t max , v in = 5 v, unless otherwise noted. table 4. ad1584a ad1584b parameter min typ max min typ max unit output voltage (@ 25c) v o 4.056 4.096 4.136 4.092 4.096 4.100 v initial accuracy error (@ 25c) v oerr ?40 +40 ?4 +4 mv ?0.98 +0.98 ?0.1 +0.1 % output voltage temperature drift 100 50 ppm/c temperature coefficient (tcv o ) ?40c < t a < +125c 40 100 18 50 ppm/c 0c < t a < 70c 35 15 ppm/c minimum supply headroom (v in C v out ) 200 200 mv load regulation 0 ma < i out < 5 ma (?40c to +85c) 0.32 0.32 mv/ma 0 ma < i out < 5 ma (?40c to +125c) 0.52 0.52 mv/ma ?5 ma < i out < 0 ma (?40c to +85c) 0.40 0.40 mv/ma ?5 ma < i out < 0 ma (?40c to +125c) 0.6 0.6 mv/ma ?0.1 ma < i out < +0.1 ma (?40c to +85c) 3.2 3.2 mv/ma ?0.1 ma < i out < +0.1 ma (?40c to +125c) 4.1 4.1 mv/ma line regulation v out + 200 mv < v in 12 v i out = 0 ma 25 25 v/v ripple rejection (v out /v in ) v in = 5 v 100 mv (f = 120 hz) 80 80 db quiescent current 70 70 a short-circuit current to ground 15 15 ma noise voltage (@ 25c) 0.1 hz to 10 hz 110 110 v p-p 10 hz to 10 khz 90 90 v rms turn-on settling time to 0.1% c l = 0.2 f 140 140 s long-term stability 1000 hours @ 25c 100 100 ppm/1000 hr output voltage hysteresis 115 115 ppm temperature range specified performance (a, b, c) ?40 +125 ?40 +125 c operating performance (a, b, c) ?55 ?125 ?55 +125 c
ad1582/ad1583/ad1584/ad1585 rev. i | page 6 of 16 ad1585 specifications @ t a = t min to t max , v in = 6 v, unless otherwise noted. table 5. ad1585a ad1585b parameter min typ max min typ max unit output voltage (@ 25c) v o 4.950 5.000 5.050 4.995 5.000 5.005 v initial accuracy error (@ 25c) v oerr ?50 +50 ?5 +5 mv ?1.0 +1.0 ?0.10 +0.10 % output voltage temperature drift 100 50 ppm/c temperature coefficient (tcv o ) ?40c < t a < 125c 40 100 18 50 ppm/c 0c < t a < 70c 35 15 ppm/c minimum supply headroom (v in C v out ) 200 200 mv load regulation 0 ma < i out < 5 ma (?40c to +85c) 0.40 0.40 mv/ma 0 ma < i out < 5 ma (?40c to +125c) 0.6 0.6 mv/ma ?5 ma < i out < 0 ma (?40c to +85c) 0.40 0.40 mv/ma ?5 ma < i out < 0 ma (?40c to +125c) 0.6 0.6 mv/ma ?0.1 ma < i out < +0.1 ma (?40c to +85c) 4 4 mv/ma ?0.1 ma < i out < +0.1 ma (?40c to +125c) 4.8 4.8 mv/ma line regulation v out + 200 mv < v in < 12 v i out = 0 ma 25 25 v/v ripple rejection (v out /v in ) v in = 6 v 100 mv (f = 120 hz) 80 80 db quiescent current 70 70 a short-circuit current to ground 15 15 ma noise voltage (@ 25c) 0.1 hz to 10 hz 140 140 v p-p 10 hz to 10 khz 100 100 v rms turn-on settling time to 0.1% c l = 0.2 f 175 175 s long-term stability 1000 hours @ 25c 100 100 ppm/1000 hr output voltage hysteresis 115 115 ppm temperature range specified performance (a, b, c) ?40 +125 ?40 +125 c operating performance (a, b, c) ?55 +125 ?55 +125 c
ad1582/ad1583/ad1584/ad1585 rev. i | page 7 of 16 absolute maximum ratings table 6. parameter rating v in to ground 12 v internal power dissipation 1 sot-23-3 (rt-3) 400 mw storage temperature range 65c to 125c specified temperature range ad1582rt/ad1583rt/ ad1584rt/ad1585rt ?40c to +125c lead temperature, soldering vapor phase (60 sec) 215c infrared (15 sec) 220c 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 1 specification is for device in fr ee air at 25c; sot-23 package, ja = 300c.
ad1582/ad1583/ad1584/ad1585 rev. i | page 8 of 16 terminology temperature coefficient (tcv o ) the change of output voltage over the operating temperature change and normalized by the output voltage at 25c, expressed in ppm/c. the equation follows [] () () () () 6 10 25 cppm/ ? ? = 12 o 1 o 2 o o ttcv tvtv tcv where: v o (25c) = v o @ 25c. v o (t 1 ) = v o @ temperature 1. v o (t 2 ) = v o @ temperature 2. line regulation (v o /v in ) definition the change in output voltage due to a specified change in input voltage. it includes the effects of self-heating. line regulation is expressed in either percent per volt, parts per million per volt, or microvolts per volt change in input voltage. load regulation (v o /i load ) the change in output voltage due to a specified change in load current. it includes the effects of self-heating. load regulation is expressed in either microvolts per milliampere, parts per million per milliampere, or ohms of dc output resistance. long-term stability (v o ) typical shift of output voltage at 25c on a sample of parts subjected to an operation life test of 1000 hours at 125c. () () 1 o 0 oo tvtvv ?= [] () () () 6 10 ppm ? = 0 o 1 o 0 o o tv tvtv v where: v o (t 0 ) = v o @25c at time 0. v o (t 1 ) = v o @ 25c after 1000 hours of operation at 125c. thermal hysteresis (v o_hys ) the change of output voltage after the device is cycled through temperatures from +25c to ?40c to +85c and back to +25c. this is a typical value from a sample of parts put through such a cycle ( ) tco o hyso vcvv _ _ 25 ? = [] ( ) () 6 _ _ 10 25 25 ppm ? = cv vcv v o tco o hyso where: v o (25c) = v o at 25c. v o_tc = v o at 25c after temperature cycle at +25c to ?40c to +85c and back to +25c. operating temperature the temperature extremes at which the device can still function. parts can deviate from their specified performance outside the specified temperature range.
ad1582/ad1583/ad1584/ad1585 rev. i | page 9 of 16 typical performance characteristics 6 0 14 8 4 2 12 10 number of parts 22 16 20 18 ppm/c ?60 ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 00701-003 figure 3. typical output voltag e temperature drift distribution 50 15 0 45 20 10 5 35 25 40 30 v out (error) number of parts 1.0% 0.6% 0.2% ?0.2% ?0.6% ?1.0% 00701-004 figure 4. typical output voltage error distribution 2.504 2.502 2.494 2.492 2.490 2.488 2.500 2.496 2.498 temperature (c) ?40 0 ?20 20 40 60 80 100 120 v out 00701-005 figure 5. typical temperature drift characteristic curves 0 0.25 0.20 0.15 0.10 0.35 0.30 0.40 0.05 mv/ma 024681012 v in (v) ad1585 ad1582 0 0701-006 figure 6. load regulation vs. v in ?20 ?40 ?60 ?80 ?70 ?30 ?50 v/ v 0 ?90 ?10 ad1585 ad1582 i out (ma) ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 5 00701-007 figure 7. line regulation vs. i load 10k 1k 100 10 100 1k 10k 100k frequency (hz) i out = 1ma i out = 0ma nv/ hz 0 0701-008 figure 8. noise spectral density
ad1582/ad1583/ad1584/ad1585 rev. i | page 10 of 16 theory of operation the ad1582/ad1583/ad1584/ad1585 use the band gap concept to produce stable, low temperature coefficient voltage references suitable for high accuracy data acquisition compo- nents and systems. these parts of precision references use the underlying temperature characteristics of a silicon transistors base emitter voltage in the forward-biased operating region. under this condition, all such transistors have a ?2 mv/c temperature coefficient (tc) and a v be that, when extrapolated to absolute zero, 0 k (with collector current proportional to absolute temperature), approximates the silicon band gap voltage. by summing a voltage that has an equal and opposite tempera- ture coefficient of 2 mv/c with the v be of a forward-biased transistor, an almost 0 tc reference can be developed. in the ad1582/ad1583/ad1584/ad1585 simplified circuit diagram shown in figure 9 , such a compensating voltage, v1, is derived by driving two transistors at different current densities and amplifying the resultant v be difference (v be , which has a positive tc). the sum of v be and v1 (v bg ) is then buffered and amplified to produce stable reference voltage outputs of 2.5 v, 3 v, 4.096 v, and 5 v. r4 r6 r5 gnd v1 + ? r3 + r2 ? r1 v in v out v bg v be 00701-009 figure 9. simplified schematic
ad1582/ad1583/ad1584/ad1585 rev. i | page 11 of 16 applications information the ad1582/ad1583/ad1584/ad1585 are series references that can be used for many applications. to achieve optimum performance with these references, only two external compo- nents are required. figure 10 shows the ad1582/ad1583/ ad1584/ad1585 configured for operation under all loading conditions. with a simple 4.7 f capacitor attached to the input and a 1 f capacitor applied to the output, the devices can achieve specified performance for all input voltage and output current requirements. for best transient response, add a 0.1 f capacitor in parallel with the 4.7 f capacitor. while a 1 f output capacitor can provide stable performance for all loading conditions, the ad1582/ad1583/ad1584/ad1585 can operate under low (?100 a < i out < +100 a) current conditions with just a 0.2 f output capacitor. the 4.7 f capacitor on the input can be reduced to 1 f in this condition. unlike conventional shunt reference designs, the ad1582/ ad1583/ad1584/ad1585 provide stable output voltages at constant operating current levels. when properly decoupled, as shown in figure 10 , these devices can be applied to any circuit and provide superior low power solutions. v out 1 2 v in 3 ad1582/ ad1583/ ad1584/ ad1585 1f 4.7f + ? 00701-010 figure 10. typical connection diagram temperature performance the ad1582/ad1583/ad1584/ad1585 are designed for applications where temperature performance is important. extensive temperature testing and characterization ensure that device performance is maintained over the specified temperature range. the error band guaranteed with the ad1582/ad1583/ad1584/ ad1585 is the maximum deviation from the initial value at 25c. therefore, for a given grade of the ad1582/ad1583/ad1584/ ad1585, the designer can easily determine the maximum total error by summing initial accuracy and temperature variation. for example, for the ad1582brt, the initial tolerance is 2 mv, and the temperature error band is 8 mv; therefore, the reference is guaranteed to be 2.5 v 10 mv from ?40c to +125c. figure 11 shows the typical output voltage drift for the ad1582/ ad1583/ad1584/ad1585 and illustrates the methodology. the box in figure 11 is bounded on the x-axis by operating tempera- ture extremes. it is bounded on the y-axis by the maximum and minimum output voltages observed over the operating temperature range. the slope of the diagonal drawn from the initial output value at 25c to the output values at +125c and ?40c determines the performance grade of the device. duplication of these results requires a test system that is highly accurate with stable temperature control. evaluation of the ad1582/ad1583/ad1584/ad1585 produces curves similar to those in figure 5 and figure 11 , but output readings can vary depending on the test methods and test equipment used. 2.504 2.502 2.500 2.498 2.496 2.494 2.492 temperature (c) v out (v) ?40 ?20 0 20 40 60 80 100 120 2.504 2.502 2.500 2.498 2.496 2.494 2.492 temperature (c) v out (v) ?40 ?20 0 20 40 60 80 100 120 00701-011 figure 11. output voltage vs. temperature voltage output nonlinearity vs. temperature when using a voltage reference with data converters, it is important to understand the impact that temperature drift can have on converter performance. the nonlinearity of the reference output drift represents additional error that cannot be easily calibrated out of the overall system. to better understand the impact such a drift can have on a data converter, refer to figure 12 , where the measured drift characteristic is normalized to the endpoint average drift. the residual drift error for the ad1582/ ad1583/ad1584/ad1585 of approximately 200 ppm demon- strates that these parts are compatible with systems that require 12-bit accurate temperature performance. 250 200 150 100 50 0 ?50 temperature (c) ?50 ?25 0 25 50 75 100 v out (ppm) 0 0701-012 figure 12. residual drift error
ad1582/ad1583/ad1584/ad1585 rev. i | page 12 of 16 output voltage hysteresis high performance industrial equipment manufacturers can require the ad1582/ad1583/ad1584/ad1585 to maintain a consistent output voltage error at 25c after the references are operated over the full temperature range. all references exhibit a characteristic known as output voltage hysteresis; however, the ad1582/ad1583/ad1584/ad1585 are designed to minimize this characteristic. this phenomenon can be quantified by mea- suring the change in the +25c output voltage after temperature excursions from +125c to +25c and from ?40c to +25c. figure 13 displays the distribution of the ad1582/ad1583/ ad1584/ad1585 output voltage hysteresis. 80 70 60 50 ?700 ?450 ?200 50 300 550 number of parts 40 30 20 10 0 ppm 0 0701-013 figure 13. output voltage hysteresis distribution supply current vs. temperature the quiescent current for the ad1582/ad1583/ad1584/ ad1585 varies slightly over temperature and input supply range. figure 14 illustrates the typical performance for the ad1582/ad1583/ad1584/ad1585 reference when varying both temperature and supply voltage. as is evident from figure 14 , the ad1582/ad1583/ad1584/ad1585 supply current increases only 1.0 a/v, making this device extremely attractive for use in applications where there can be wide variations in supply voltage and a need to minimize power dissipation. 100 80 60 40 20 0 i q (a) v in (v) 34567891011 t a = +25c t a = +85c t a = ?40c 00701-014 figure 14. typical supply current over temperature supply voltage one of the ideal features of the ad1582/ad1583/ad1584/ad1585 is low supply voltage headroom. the parts can operate at supply voltages as low as 200 mv above v out and up to 12 v. however, if negative voltage is inadvertently applied to v in with respect to ground, or any negative transient >5 v is coupled to v in , the device can be damaged. ac performance to apply the ad1582/ad1583/ad1584/ad1585, it is impor- tant to understand the effects of dynamic output impedance and power supply rejection. in figure 15 , a voltage divider is formed by the ad1582/ad1583/ad1584/ ad1585 output impedance and by the external source impedance. figure 16 shows the effect of varying the load capacitor on the reference output. power supply rejection ratio (psrr) should be determined when characterizing the ac performance of a series voltage reference. figure 17 shows a test circuit used to measure psrr, and figure 18 demonstrates the ability of the ad1582/ad1583/ ad1584/ad1585 to attenuate line voltage ripple. 5v 5f 1f 2v out 10k ? 10k ? 2k? 10k ? 2v 100a 1 v load dc dut 0 0701-015 figure 15. output impedance test circuit 100 ad1585 ad1582 10 1 0.1 10 100 1k 10k 100k 1m frequency (hz) output impedance ( ? ) 1f cap 0 0701-016 figure 16. output im pedance vs. frequency 5v 100mv 0.22f 0.22f 10v 10k? 10k? 200mv 1 dut v out 0 0701-017 figure 17. ripple rejection test circuit
ad1582/ad1583/ad1584/ad1585 rev. i | page 13 of 16 100 90 0 1 10 100 1k 10k 100k 50 20 80 70 60 40 30 10 1 m ad1582 ad1585 psrr (db) frequency (hz) 00701-018 figure 18. ripple rejection vs. frequency noise performance and reduction the noise generated by the ad1582/ad1583/ad1584/ad1585 is typically less than 70 v p-p over the 0.1 hz to 10 hz frequency band. figure 19 shows the 0.1 hz to 10 hz noise of a typical ad1582/ad1583/ad1584/ad1585. the noise measurement is made with a high gain band-pass filter. noise in a 10 hz to 10 khz region is approximately 50 v rms. figure 20 shows the broadband noise of a typical ad1582/ad1583/ad1584/ad1585. if further noise reduction is desired, add a 1-pole, low-pass filter between the output pin and ground. a time constant of 0.2 ms has a ?3 db point at roughly 800 hz and reduces the high frequency noise to about 16 v rms. it should be noted, however, that while additional filtering on the output can improve the noise performance of the ad1582/ad1583/ ad1584/ad1585, the added output impedance can degrade the ac performance of the references. 100 90 10 0% 10v 1s 00701-019 figure 19. 10 hz to 10 khz wideband noise 10 0% 100 90 10ms 100v 00701-020 figure 20. 1 hz to 10 hz voltage noise turn-on time many low power instrument manufacturers are concerned with the turn-on characteristics of the components used in their systems. fast turn-on components often enable the end user to save power by keeping power off when not needed. turn-on settling time is defined as the time required, after the application of power (cold start), for the output voltage to reach its final value within a specified error. the two major factors affecting this are the active circuit settling time and the time required for the thermal gradients on the chip to stabilize. figure 21 shows the turn-on settling and transient response test circuit. figure 22 shows the turn-on characteristics of the ad1582/ad1583/ ad1584/ad1585. these characteristics are generated from cold- start operation and represent the true turn-on waveform after power-up. figure 23 shows the fine settling characteristics of the ad1582/ad1583/ad1584/ad1585. typically, the reference settles to within 0.1% of its final value in about 100 s. the device can momentarily draw excessive supply current when v supply is slightly below the minimum specified level. power supply resistance must be low enough to ensure reliable turn-on. fast power supply edges minimize this effect. 0.22f 0.22f 0 v or 10 v 0v to 10v 10k? 10k? dut v out 5v or 10v 0v or 5v 00701-021 figure 21. turn-on/transient response test circuit
ad1582/ad1583/ad1584/ad1585 rev. i | page 14 of 16 10 0% 100 5v 1v 20s 20s 90 00701-022 10 0% 100 90 5v 200mv 50s 50s 00701-024 figure 22. turn-on characteristics figure 24. line transient response 10 0% 100 5v 1mv 20s 20s 90 00701-023 10 0% 100 5v 5mv 90 20s 20s 0 0701-025 figure 23. turn-on settling figure 25. load transient response (0 ma to 5 ma load) dynamic performance 0% 100 90 5v 20s 20s 5mv 10 00701-026 many adcs and dacs present transient current loads to the reference and poor reference response can degrade converter performance. the ad1582/ad1583/ad1584/ad1585 provide superior static and dynamic line and load regulation. because these series references are capable of both sourcing and sinking large current loads, they exhibit excellent settling charac- teristics. figure 24 displays the line transient response for the ad1582/ ad1583/ad1584/ad1585. the circuit used to perform such a measurement is shown in figure 21 , where the input supply voltage is toggled from 5 v to 10 v, and the input and output capacitors are each 0.22 f. figure 26. load transient response (0 ma to ?1 ma load) figure 25 and figure 26 show the load transient settling cha- racteristics for the ad1582/ad1583/ad1584/ad1585 when load current steps of 0 ma to +5 ma and 0 ma to ?1 ma are applied. the input supply voltage remains constant at 5 v; the input decoupling and output load capacitors are 4.7 f and 1 f, respectively; and the output current is toggled. for both positive and negative current loads, the reference responses settle very quickly and exhibit initial voltage spikes of less than 10 mv.
ad1582/ad1583/ad1584/ad1585 rev. i | page 15 of 16 outline dimensions 3.04 2.90 2.80 compliant to jedec standards to-236-ab 011909-c 1 2 3 seating plane 2.64 2.10 1.40 1.30 1.20 2.05 1.78 0.100 0.013 1.03 0.89 0.60 0.45 0.51 0.37 1.12 0.89 0.180 0.085 0.25 0.54 ref gauge plane 0.60 max 0.30 min 1.02 0.95 0.88 figure 27. 3-lead small outline transistor package [sot-23-3] (rt-3) dimensions shown in millimeters 053006-0 20.20 min 1.00 min 0.75 min 1.10 1.00 0.90 1.50 min 7? reel 100.00 or 13? reel 330.00 7? reel 50.00 min or 13? reel 100.00 min direction of unreeling 0.35 0.30 0.25 2.80 2.70 2.60 1.55 1.50 1.45 4.10 4.00 3.90 1.10 1.00 0.90 2.05 2.00 1.95 8.30 8.00 7.70 3.20 3.10 2.90 3.55 3.50 3.45 13.20 13.00 12.80 14.40 min 9.90 8.40 6.90 figure 28. sot-23 tape and reel outline dimension (rt-3) dimensions shown in millimeters
ad1582/ad1583/ad1584/ad1585 rev. i | page 16 of 16 ordering guide model 1 output voltage (v) accuracy (mv) initial accuracy (%) initial temp. coefficient (ppm/c) package description package option branding 2 no. of parts banding per reel ad1582art-reel7 2.50 20 0.80 100 sot-23-3 rt-3 2a 3,000 ad1582artz-r2 2.50 20 0.80 100 sot-23-3 rt-3 r1z 250 ad1582artz-reel7 2.50 20 0.80 100 sot-23-3 rt-3 r1z 3,000 ad1582brt-reel7 2.50 2 0.08 50 sot-23-3 rt-3 2b 3,000 ad1582brtz-reel7 2.50 2 0.08 50 sot-23-3 rt-3 r20 3,000 ad1583art-reel7 3.00 30 1.00 100 sot-23-3 rt-3 3a 3,000 ad1583artz-r2 3.00 30 1.00 100 sot-23-3 rt-3 r22 250 ad1583artz-reel7 3.00 30 1.00 100 sot-23-3 rt-3 r22 3,000 ad1583brt-reel7 3.00 3 0.10 50 sot-23-3 rt-3 3b 3,000 ad1583brtz-reel7 3.00 3 0.10 50 sot-23-3 rt-3 r23 3,000 AD1584ARTZ-R2 4.096 40 0.98 100 sot-23-3 rt-3 r25 250 ad1584artz-reel7 4.096 40 0.98 100 sot-23-3 rt-3 r25 3,000 ad1584brtz-reel7 4.096 4 0.10 50 sot-23-3 rt-3 r26 3,000 ad1585artz-r2 5.00 50 1.00 100 sot-23-3 rt-3 r28 250 ad1585artz-reel7 5.00 50 1.00 100 sot-23-3 rt-3 r28 3,000 ad1585brtz-reel7 5.00 5 0.10 50 sot-23-3 rt-3 r29 3,000 1 z = rohs compliant part. 2 see package branding information section. package branding information this branding information is only for nonpb-free versions. four fields identify the device: first field, product identifier; for example, a 2/3/4/5 identifies the generic as ad1582/ad1583/ad1584/ad1585 second field, device grade, which can be a, b, or c third field, calendar year of processing: 7 for 1997..., a for 2001... fourth field, two-week window within the calendar year; for example, letters a to z to represent a two-week window starting wit h a for the first two weeks of january. ?1997C2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d00701-0-5/10(i)

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