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1.2 v micropower, precision shunt voltage reference ad1580 rev. f 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 it s 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 technolo gy way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ? 2003- 2011 analog devices, inc. all rights reserved. features wide operating range: 50 a to 10 ma initial accuracy: 0.1% maximum temperature drift: 50 ppm/c maximum output impedance: 0.5 ? maximum wideband noise (10 hz to 10 khz): 20 v rms operating temperature range: ? 40c to +85c high esd rating 4 kv human body model 400 v machine model compact, surface - mount sot - 23 and sc70 packages applications portable, battery - powered equipment cellular phones, notebook computers, pdas, gpss, and dmms computer workstations suitable for use with a wide range of vi deo ramdacs smart industrial transmitters pcmcia cards automotive 3 v/5 v, 8 - bit to 12 - bit data converters general description the ad1580 1 the superior accuracy and stability of the ad1580 is made possible by the precise matc hing and thermal tracking of on - chip components. proprietary curvature correction design techniques have been used to minimize the nonli - n earities in the voltage output temperature characteristics. the ad1580 is stable with any value of capacitive load. is a low cost, 2 - terminal (shunt), precision band gap reference. it provides an accurate 1.225 v output for input cur rents between 50 a and 10 ma. the low minimum operating current makes the ad1580 ideal for use in battery - powered 3 v or 5 v systems. however, the wide operating curren t range means that the ad1580 is extremely versatile and suitable for use in a wide variety of high current applications. the ad1580 is available in two grades, a and b, both of which are provided in the sot - 23 and sc70 packages, the smallest surface - moun t packages available. both grades are specified over the industrial temperature range of ?40c to +85c. 1 protected by u.s. patent no. 5,969,657 . pin configurations nc = n o c o nn ec t t op vi ew v+ 1 v? 2 nc (o r v? ) 3 ad 158 0 00700-001 nc = n o c o nn ec t t op vi ew v? 1 v+ 2 nc (o r v? ) 3 ad 158 0 00700-002 figure 1 . sot - 23 figure 2 . sc 70 5 0 0 quantity 4 5 4 0 3 5 3 0 2 5 2 0 1 5 1 0 5 t empera t ur e dr i ft (ppm / c ) ?4 0 ?3 0 ?2 0 ?1 0 0 1 0 2 0 3 0 4 0 00700-003 figure 3 . rever se voltage temperature drift distribution o u t pu t err o r (m v) 30 0 0 quantity 25 0 20 0 15 0 10 0 5 0 ?1 0 ? 8 ? 6 ? 4 ? 2 0 2 4 6 8 1 0 00700-004 figure 4 . reverse voltage error distribution
ad1580 rev. f | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 pin configurations ........................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 typical performance characteristics ............................................. 5 theory of operation ........................................................................ 6 applying the ad1580 .................................................................. 6 temperature performance ........................................................... 6 voltage output nonlinearity vs. temperature ..........................7 reverse voltage hysteresis ...........................................................7 output impedance vs. frequency ...............................................7 noise performance and reduction .............................................8 tur n - on time ...............................................................................8 transient response .......................................................................9 precision micro power low dropout reference .......................9 using the ad1580 with 3 v data converters ...........................9 outline dimensions ....................................................................... 11 ordering guide .......................................................................... 12 package branding information ................................................ 12 revision history 7/11 rev. e to rev. f changes to ordering guide .......................................................... 12 7/ 11 rev. d to rev. e updated outline dimensions ....................................................... 11 changes to ordering guide .......................................................... 12 1/0 8 rev. c to rev. d changes to figure 5 .......................................................................... 5 changes to figure 6 caption ........................................................... 5 changes to ordering guide .......................................................... 12 7/06 rev. b to rev. c updated format .................................................................. universal changes to figure 13 ........................................................................ 7 changes to figure 16 ........................................................................ 8 updated outline dimensions ....................................................... 11 changes to ordering guide .......................................................... 12 7/04 rev. a to rev . b changes to ordering guide .............................................................2 10/03 rev. 0 to rev. a renumbered figures and tpcs ........................................ universal edits to features .................................................................................1 edits to general description ...........................................................1 edits to ordering guide ...................................................................2 updated figures 5 through 7 ..........................................................4 updated outline dimensions ..........................................................8
ad1580 rev. f | page 3 of 12 specifications t a = 25c, i in = 100 a, unless otherwise noted. table 1. model ad1580a ad1580b unit min typ max min typ max reverse voltage output (sot - 23) 1.215 1.225 1.235 1.224 1.225 1.226 v reverse voltage output (sc70) 1.2225 1.225 1.2275 v reverse voltage temperature drift ?40c to +85c 100 50 ppm/c minimum operating current, t min to t max 50 50 a reverse voltage change with reverse current 50 a < i in < 10 ma, t min to t max 2.5 6 2.5 6 mv 50 a < i in < 1 ma, t min to t max 0.5 0.5 mv dy namic output impedance ( ?v r / i r ) i in = 1 ma 100 a (f = 120 hz) 0.4 1 0.4 0.5 ? output noise rms noise voltage: 10 hz to 10 khz 20 20 v rms low frequency noise voltage: 0.1 hz to 10 hz 5 5 v p -p turn - on settling time to 0.1% 1 5 5 s output voltage hysteresis 2 80 80 v temperature range specified performance, t min to t max ? 40 +85 ? 40 +85 c operating range 3 ? 55 +125 ? 55 +125 c 1 measured with no load capacitor. 2 output hysteresis is defined as the change in the +25c output voltage after a temperature excursion to +85c and then to ? 40c. 3 the operating temperature range is defined as the temperature extremes at which the device continue s to function. parts may deviate from their specified performance.
ad1580 rev. f | page 4 of 12 absolute maximum rat ings table 2. parameter rating reverse current 25 ma forward current 20 ma internal power dissipation 1 sot - 23 (rt) 0.3 w storage temperature range ?65c to +150c operating temperature range ad1580/rt ?55c to +125c lead temperature, soldering vapor phase (60 sec) 2 15c infrared (15 sec) 220c esd susceptibility 2 human body model 4 kv machine model 400 v 1 specification is for device in free air at 25c, sot - 23 package . ja = 300c/w. 2 the human body model is a 100 pf capacitor discharged through 1.5 k ? . for the machine model, a 200 pf capacitor is discharged directly into the device. 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 o r 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
ad1580 rev. f | page 5 of 12 typical performance characte ristics reverse voltage change (ppm) ?2000 ?1000 ?500 0 500 1000 ?1500 temperature (c) ?55 ?35 ?15 5 25 45 65 85 105 125 00700-005 figure 5 . output drift for different temperature characteristics 4 3 ? 1 2 1 0 reverse voltage change (mv) r eve r se curr en t (m a ) 0 . 0 1 0 . 1 1 1 0 t a = +125 c t a = ?40 c t o +85 c 00700-006 figure 6 . reverse voltage change vs. reverse current f r eq u enc y (h z) 60 0 20 0 40 0 noise voltage (nv/ hz) 1 . 0 1 0 10 0 1 k 10 k 100 k 1 m 00700-007 figure 7 . noise spectral density r eve r se vo lta g e (v) 10 0 0 4 0 2 0 8 0 6 0 ?40 c +85 c +25 c reverse current (a) 0 0 . 2 0 . 4 0 . 6 0 . 8 1 . 0 1 . 2 1 . 4 00700-008 figure 8 . reverse current vs. reverse voltage f o r w ard curr en t (m a ) 1 . 0 0 forward voltage (v) 0 . 4 0 . 2 0 . 8 0 . 6 +25 c +85 c ?40 c 0 . 0 1 0 . 1 1 1 0 10 0 00700-009 figure 9 . forward voltage vs. forward current
ad1580 rev. f | page 6 of 12 theory of operation the ad1580 uses the band gap concept to produce a stable, low temperature coefficient volt age reference suitable for high accuracy data acquisition components and systems. the device makes use of the underlying physical nature of a silicon tran - sistor base emitter voltage in the forward biased operating region. all such transistors have an appr oximately ?2 mv/c temperature coefficient (tc) , which is unsuitable for use directly as a low tc reference; however, extrapolation of the temperature characteristic of any one of these devices to absolute zero (with collector current proportional to abso lute temperature) reveals that its v be goes to approximately the silicon band gap voltage. thus, if a voltage could be developed with an opposing temperature coefficient to sum with v be , a zero tc r eference would result. the ad1580 circuit in figure 10 provides such a compensating voltage, v1, 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 provides a stable voltage reference. v+ v? v1 v b e v b e 00700-010 figure 10 . schematic diagram applying the ad1580 the ad1580 is simple to use in virtually all applications. to operate the ad1580 as a co nventional shunt regulator (see figure 11 ), an external series resistor is connected between the supply voltage and the ad1580. for a given supply voltage, the s eries resistor, r s , determines the reverse current flowing through th e ad1580. the value of r s must be chosen to accommodate the expected variations of the supply voltage, v s ; load current, i l ; and the ad1580 reverse voltage, v r ; while maintaining an acceptable reverse current, i r , through the ad1580. the minimum value for r s should be chosen when v s is at its minimum and i l and v r are at their maximum, while maintaining the minimum acceptable reverse current. the value of r s should be large enough to limit i r to 10 ma when v s is at its maximum and i l and v r are at their m inimum. the equation for selecting r s is as follows: r s = (v s ? v r )/( i r + i l ) figure 12 shows a typical connection of the ad1580brt operating at a minimum of 100 a. this connection can provide 1 ma to the load while accommodating 10% power supply variations. v s i r + i l r s v o u t i l v r i r 00700-011 figure 11 . typical connection diagram +5 v(+3 v) 10 % 2 . 94k ? (1 . 30k ? ) r s v r v o u t 00700-012 figure 12 . typical connection diagram temperature performa nce the ad1580 is designed for reference applications where stable temperature performance is important. extensive temperature testi ng and characterization ensure that the devices performance is maintained over the specified temperature range. some confusion exists in the area of defining and specifying reference voltage error over temperature. historically, references have been chara cterized using a maximum deviation per degree celsius, for example, 50 ppm/c. however, because of nonlinear - ities in temperature characteristics that originated in standard zener references (such as s type characteristics), most manufac - turers now use a m aximum limit error band approach to specify devices. this technique involves the measurement of the output at three or more different temperatures to guarantee that the voltage falls within the given error band. the proprietary curvature correction design techniques used to minimize the ad1580 nonlinearities allow the temperature performance to be guaranteed using the maximum deviation method. this method is of more use to a designer than the one that simply guarantees the maximum error band over the entire temper - ature change. figure 13 shows a typical output voltage drift for the ad1580 and illustrates the methodology. the maximum slope of the two diagonals drawn from the initial output value at +25c to the output values at +85c and ?40c determines the performance grade of the device. for a given grade of the ad1580, the designer can easily determine the maximum total error from the initial tolerance plus temperature variation.
ad1580 rev. f | page 7 of 12 output voltage (v) 1 . 223 8 1 . 224 8 1 . 225 0 1 . 225 2 1 . 225 4 1 . 225 6 1 . 225 8 1 . 224 4 1 . 224 6 1 . 224 0 1 . 224 2 v m a x v m i n sl o pe = t c = (v m a x ? v o ) (+85 c ? +25 c ) 1 . 225 1 0 ? 6 sl o pe = t c = (v m i n ? v o ) (?40 c ? +25 c ) 1 . 225 1 0 ? 6 v o ?5 5 ?3 5 ?1 5 5 2 5 4 5 6 5 8 5 10 5 12 5 t empera t ur e ( c ) 00700-013 figure 13 . output voltag e vs. temperature for example, the ad1580brt initial tolerance is 1 mv; a 50 ppm/c temperature coefficient corresponds to an error band of 4 mv (50 10 ? 6 1.225 v 65c). thus, the unit is guaranteed to be 1.225 v 5 mv over the operating tempera ture range. duplication of these results requires a combination of high accuracy and stable temperature control in a test system. evaluation of the ad1580 produces a curve similar to that in figure 5 and figure 13. voltage output nonli nearity vs . temperature when a reference is used with data converters, it is important to understand how temperature drift affects the overall converter performance. the nonlinearity of the reference output drift represent s an additional error that is not easily calibrated out of the system. this characteristic (see figure 14 ) is generated by normalizing the measured drift characteristic to the end point average drift. the residual drift error o f approximately 500 ppm shows that the ad1580 is compatible with systems that require 10- bit accurate temperature performance. 60 0 30 0 0 residual drift error (ppm) 50 0 40 0 20 0 10 0 ?5 5 ?3 5 ?1 5 5 2 5 4 5 6 5 8 5 10 5 12 5 t empera t ur e ( c ) 00700-014 figure 14 . residual drift error reverse voltage hyst eresis a major requirement for high performance i ndustrial equipment manufacturers is a consistent output voltage at nominal temperature following operation over the operating temperature range. this characteristic is generated by measur - ing the difference between the output voltage at +25c after operat ion at +85c and the output, at +25c after operation at ?40c. figure 15 displays the hysteresis associated with the ad1580. this characteristic exists in all references and has been minimized in the ad1580. quantity 0 1 5 2 0 2 5 3 0 3 5 4 0 5 1 0 h yst er esi s vo lt a g e ( v) ?40 0 ?30 0 ?20 0 ?10 0 0 10 0 20 0 30 0 40 0 00700-015 figure 15 . reverse voltage hysteresis distribution output impedance vs . frequency understanding the effect of the reverse dynamic output imped - ance in a practical application may be important to successfully apply the ad1580. a voltage divider is formed by the ad1580 output impedance and the external sour ce impedance. when an external source resistor of about 30 k (i r = 100 a) is used, 1% o f the noise from a 100 khz switching power supply is devel - oped at the output of the ad1580. figure 16 shows how a 1 f load capacitor connected directly across the ad1580 reduces the effect of power suppl y noise to less than 0.01%. 1 k 1 0 0 . 1 1 10 0 f r eq u enc y (h z) c l = 0 c l = 1 f i r = 0 . 1 i r i r = 100 a i r = 1m a output impedance ( ?) 1 0 10 0 1 k 10 k 100 k 1 m 00700-016 figure 16 . output impedance vs. frequency
ad1580 rev. f | page 8 of 12 noise performance an d reduction the noise generated by the ad1580 is typically less than 5 v p - p over the 0.1 hz to 10 hz band. figu re 17 shows the 0.1 hz to 10 hz noise of a typical ad1580. noise in a 10 hz to 10 khz bandwidth is approximately 20 v rms (see figure 18 a). if further noise reduction is desired, a 1 - pole low - pass filter can be added between the output pin and ground. a time constant of 0.2 ms has a ?3 db point at about 800 hz and reduces the high frequency no ise to about 6.5 v rms (see figure 18 b). a time constant of 960 ms has a ?3 db point at 165 hz and reduces the high frequency noise to about 2.9 v rms (see figure 18 c). 1s / d i v 1 v/ d i v 4 . 5 v p -p 00700-017 figure 17 . 0.1 hz to 10 hz voltage noise 40 v/ d i v 21 v rms 20 v/ d i v 10 v/ d i v 10ms / d i v 6 . 5 v rms, = 0 . 2m s ( a ) ( b ) ( c ) 2 . 90 v rms, = 960m s 00700-018 figure 18 . total rms noise turn - on time many low power instrument manufacturers are becoming increasingly concerned with the turn - on characteristics of components being used in their systems. fast turn - on compo - nents often enable the end user to keep power off when not needed, and yet those components respond quickly when the power is turned on for operation. figure 19 displays the turn - on characteristic of the ad1580 . upon application of power (cold start), the time required for the output voltage to reach its final value within a specified error is the turn - on settling time. two components normally associated with this are time for active circuits to settle and tim e for thermal gradients on the chip to stabilize. this characteristic is generated from cold start operation and represents the true turn - on waveform after power - up. figure 21 shows both the coarse and fine turn - on settling charac teristics of the device; the total settling time to within 1.0 mv is about 6 s, and there is no long thermal tail when the horizontal scale is expanded to 2 ms/div. 250m v/ d i v 5 s / d i v c l = 200 p f v i n 0 v 2 . 4 v 00700-019 figure 19 . turn - on response time + ? r s = 11 . 5k ? r l c l v o u t v r v i n 00700-020 figure 20 . turn - on, settling, and transient test circuit output turn - on time is modified when an external noise reduction filter is used. when present, the time constant of the filter dominates overall settling. 0 v v i n 2 . 4 v o u t pu t err o r 1m v/ d i v, 2 s / d i v o u t pu t 0 . 5m v/ d i v, 2ms / d i v 00700-021 figure 21 . turn - o n settling
ad1580 rev. f | page 9 of 12 transient response many a d c and d a c converters present transient current loads to the reference. poor reference response can degrade the converters performance. figure 22 displays both the coarse and fine settling c haracteristics of the device to load transients of 50 a. ( a ) ( b ) 1 s / d i v 1m v/ d i v 20m v/ d i v i r = 100 a ? 50 a st ep i r = 100 a + 50 a st ep 1m v/ d i v 20m v/ d i v 00700-022 figure 22 . transient settling figure 22 a shows the settling characteristics of the device for an increased reverse current of 50 a. figure 22 b shows the response when the reverse current is decreased by 50 a. the transients settle to 1 mv in about 3 s. attempts to drive a large capacitive load (in excess of 1000 pf) may result in ringing, as shown in the step response (see figure 23 ). this is due to the additional poles formed by the load capacit - ance and t he output impedance of the reference. a recommended method of driving capacitive loads of this magnitude is shown in figure 20 . a resistor isolates the capacitive load from the output stage, while the capacitor provides a single - pole low - pass filter and lowers the output noise. 1 . 8 v 2 . 0 v v i n c l = 0 . 01 f 50 s / d i v 10m v/ d i v 00700-023 figure 23 . transient response with capacitive load precision micropower low dropout reference the circuit in figure 24 provides an ideal solution for making a stable voltage reference with low standby power consumption, low inp ut/output dropout capability, and minimum noise output. the amplifier both buffers and optionally scales up the a d1580 output voltage, v r . output voltages as high as 2.1 v can supply 1 ma of load current. a one - pole filter connected between the ad1580 and the op193 input can be used to achieve low output noise. the nominal quiescent power consumption is 200 w. 3 v 34 . 8k ? ad 158 0 o p 193 v o u t = +1 . 225 v o r v o u t = +1 . 225 (1 + r 2 / r 3 ) r 3 r 2 4 . 7 f 205 ? 00700-024 fig ure 24 . micropower buffered reference using the ad1580 wit h 3 v data converter s the ad1580 low output drift (50 ppm/c) and compact submi - niature sot - 23 package make it ideally suited for todays high performance converters in spac e critical applications. one family of adcs for which the ad1580 is well suited is the ad7714 - 3 and ad7715 - 3. the ad7714/ad77 15 are charge - balancing ( - ?) a d cs with on - chip digital filtering intended for the measurement of wide dynamic range, low frequency signals such as those representing chemical, physical, or biological processes. figure 25 shows the ad1580 connected to the ad7714 - 3 / ad7715 - 3 for 3 v operation. ad7714-3 and ad7715?3 ad1580 3v 34.8k ? refin(+) refin(?) high impedance >1g ? r sw 5k ? (typ) c ref (3pf to 8pf) switching frequency depends on f clkin 00700-025 figure 25 . reference circuit for the ad7 714 - 3 and ad7715 - 3
ad1580 rev. f | page 10 of 12 the ad1580 is ideal for creating the reference level to use with 12 - bit multiplying dacs, such as the ad7943, ad7945, and ad7948. in the single - supply bias mode (see figure 26 ), the impedance seen looking into the i out2 terminal changes with dac code. if the ad1580 drives i out2 and agnd directly, less than 0.2 lsbs of additional linearity error results. the buffer amp eliminates any linearity degradation that could result from variations in the reference level. da c rb f a g n d d g n d a 1 c 1 3 . 3 v 41 . 2k ? 3 . 3 v ad 158 0 sig na l g r o un d a 1 : o p29 5 ad 82 2 o p228 3 a 1 v r e f v i n v d d i o u t 1 i o u t 2 v o u t ad 7943 / ad 7945 / ad 794 8 00700-026 figure 26 . single - supply system
ad1580 rev. f | page 11 of 12 outline dimensions 3.04 2.90 2.80 compliant t o jedec s t andards t o-236-ab 011909-c 1 2 3 sea ting 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 all dimensio ns compl iant wi th eiaj sc70 072809-a 0 . 4 0 0 . 2 5 0 . 1 0 m a x 1 . 0 0 0 . 8 0 1 . 1 0 0 . 8 0 0 . 4 0 0 . 1 0 0 . 2 6 0 . 1 0 0 . 3 0 0 . 2 0 0 . 1 0 2 1 3 0 . 6 5 b s c 2 . 2 0 2 . 0 0 1 . 8 0 2 . 4 0 2 . 1 0 1 . 8 0 1 . 3 5 1 . 2 5 1 . 1 5 copla narit y 0.10 sea ting plane figure 27 . 3 - lead small outline transistor package [sot - 23- 3] (rt - 3) dimensions shown in millimeters figure 28 . 3 - lead thin shrink small outline transistor package [sc70] (ks - 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 29 . tape and reel dimensions (rt - 3 and ks - 3) dimensions shown in millimeters
ad1580 rev. f | page 12 of 12 ordering guide model 1 temperature range initial o utput error temperature coefficient package description package option branding ad1580art - reel ?40c to +85c 10 mv 100 ppm/c 3- lead sot -23-3 rt -3 0axx ad1580artz - reel ?40c to +85c 10 mv 100 ppm/c 3- lead sot -23-3 rt -3 r0y ad1580artz - reel7 ?40c to +85c 10 mv 100 ppm/c 3- lead sot -23-3 rt -3 r0y ad1580brt - reel7 ?40c to +85c 1 mv 50 ppm/c 3- lead sot -23-3 rt -3 0bxx ad1580brtz -r2 ?40c to +85c 1 mv 50 ppm/c 3- lead sot -23-3 rt -3 r2e ad1580brtz - reel7 ?40c to +85c 1 mv 50 ppm/c 3- lead sot -23-3 rt -3 r2e ad1580bksz - reel ?40c to +85c 2.5 mv 50 ppm/c 3- lead sc70 ks -3 r2e ad1580bksz - reel7 ?40c to +85c 2.5 mv 50 ppm/c 3- lead sc70 ks -3 r2e 1 z = rohs compliant part. package branding inf ormation in the sot - 23 package (rt), four marking fields identify the device generic, grade, and date of processing. the first field is the product id entifier. a 0 identifies the generic as the ad1580. the second field indicates the device grade: a or b. in the third field, a numeral or letter indicates a calendar year: 5 for 1995, a for 2001. in the fourth field, letters a through z represent a two - week window within the calendar year, starting with a for the first two weeks of january. ? 2003 - 2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owne rs. d00700 - 0- 7/11(f)

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