high precision, 2.5 v ic reference ad580 rev. b in fo rmation furn ished by an alog d e v i c e s is believed to be accurate and reliable. how e ver, n o resp on sibili ty is assume d b y a n alog de vices fo r its use, nor for an y i n fri n geme nt s of p a t e nt s or ot h e r ri ght s o f th ird parties th at may result fro m its use . s p ecificatio n s subj ec t to ch an g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot herwi s e u n der a n y p a t e nt or p a t e nt ri ghts of analog de v i ces. trademarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2004 analog de vices, i n c. al l r i ght s r e ser v ed . fea t ures laser-trimmed to high accuracy: 2.500 v 0. 4 % 3-terminal de vi ce: voltage in/voltage out excellent temp erature s t abilit y: 10 ppm/c (a d580m, u) excellent long-term stability: 250 v (25 v/ m onth) low quiescent current: 1.5 m a maximum small, hermeti c ic package: t o -52 can mil-std-883 c o mpliant versi o ns available func ti on a l bl ock di a g r a m +e ?e e out 00525-b - 001 bottom view fi g u r e 1 . gener a l description the ad580 1 is a 3-t e r m ina l , lo w cost, t e m p era t ur e- co m p e n s a te d , b a ndga p vol t a g e r e fer e n c e, w h ich p r o v ides a f i x e d 2.5 v o u t p u t f o r in p u ts b e tween 4.5 v a nd 30 v . a uniq ue co m b in a t ion o f ad van c e d cir c ui t desig n and la s e r - wa fer tr imm e d thin f i lm r e sis t o r s p r o v ide t h e ad580 wi t h an ini t ial t o lera n c e o f 0. 4 %, a t e m p er a t ur e s t a b i l i t y o f b e t t er t h an 10 p p m /c, and lo n g -t er m s t ab ili t y o f bet t er than 250 v . i n addi t i o n , t h e lo w q u ies c e n t c u r r en t dr a i n o f 1.5 ma max i m u m o f fers a cle a r ad va n t a g e o v er cla s sica l z e n e r t e chniq u es. the ad580 is r e co mm en de d as a s t ab le r e f e r e n c e f o r al l 8-, 10 -, an d 1 2 - bit d / a c o n v e r te r s t h at re qu i r e an e x te r n a l re f e re nc e. in addi tio n , t h e wide in p u t ra n g e o f th e ad580 al lo ws o p era t io n wi t h 5 v o l t log i c s u p p lies, making th e ad580 ideal f o r dig i tal p a n e l met e r a p plica t ion s o r w h e n e v er o n l y a sing le log i c p o w e r su p p ly is a v ai l a bl e. the ad580j , k, l, a nd m a r e s p ecif ied f o r o p era t io n o v er the 0c t o +70c t e m p er a t ur e ra n g e; th e ad580s, t , an d u a r e s p e c if ie d fo r o p era t io n o v er t h e ext e n d e d tem p era t ur e ra n g e o f C55c t o +125c. produc t highlight s 1. l a se r - tri m m i n g o f th e th in f i lm r e si s t o r s m i n i m i z e s th e ad580 o u t p u t er r o r . f o r e x a m p l e , th e ad580l ou t p u t tol e r a nc e i s 1 0 mv . 2. the t h r e e- t e r m inal v o l t a g e in/vol t a g e o u t op era t io n o f t h e ad580 p r o v ides r e gu la ted o u t p u t v o l t a g e wi t h ou t an y ext e r n al co m p on e n ts. 3. the ad580 p r o v ides a s t ab le 2. 5 v o u t p u t v o l t ag e f o r in p u t v o l t a g es betw een 4.5 v an d 30 v . th e c a p a b i li ty t o p r o v ide a s t ab le o u t p u t v o l t a g e usin g a 5 v in p u t ma k e s th e ad580 a n ideal ch o i ce f o r sys t em s tha t co n t a i n a sin g le log i c p o we r su p p ly . 4. thin f i lm r e sis t o r t e c h n o log y a nd tig h tl y con t r o l l e d b i p o la r p r o c es sin g p r o v ide the ad580 wi t h t e m p era t u r e s t a b il i t ies t o 10 p p m /c and lo n g -ter m s t a b ili t y b e t t e r tha n 250 v . 5. the lo w q u ies c en t c u r r en t dra i n o f th e ad580 mak e s i t id eal f o r cm os a n d o t h e r lo w p o w e r a p p l ica t io n s . 6. the ad580 is a v a i lab l e in v e rsio n s co m p l i an t wi t h mil - s t d-883. ref e r t o th e analog devices m i l i ta r y p r o d uc ts da t a b o ok o r t h e c u r r en t ad58 0/ad883b da ta s h e e t f o r det a i l e d sp e c if ic a t io n s . 1 pr otected by u. s. patent numbers 3,887,863; re30,586.
ad580 rev. b | page 2 of 8 table of contents specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 ad580 chip dimensions and pad layout ............................... 4 esd caution .................................................................................. 4 theory of operation ........................................................................ 5 voltage variation versus temperature ....................................... 5 noise performance ....................................................................... 6 the ad580 as a current limiter .................................................6 the ad580 as a low power, low voltage, precision reference for data converters .......................................................................7 outline dimensions ..........................................................................8 ordering guide .............................................................................8 revision history 8/04changed from rev. a to rev. b updated format................................................................ universal
ad580 rev. b | page 3 of 8 specifications table 1. v in = 15 v and 25c ad580j ad580k ad580l ad580m model min typ max min typ max mi n typ max min typ max units output voltage tolerance error from nominal 2.500 v output 75 25 10 10 mv output voltage change t min to t max 15 7 4.3 1.75 mv 85 40 25 10 ppm/c line regulation 7 v v in 30 v 1.5 6 1 1.5 4 2 2 mv 4.5 v v in 7 v 0.3 3 0.3 2 1 1 mv load regulation ?i = 10 ma 10 10 10 10 mv quiescent current 1.0 1.5 1.0 1.5 1.0 1.5 1.0 1.5 ma noise (0.1 hz to 10 hz) 8 8 8 8 v p-p stability long term 250 250 250 250 v per month 25 25 25 25 v temperature performance specified 0 +70 0 +70 0 +70 0 +70 c operating C55 +125 C55 +125 C55 +125 C55 +125 c storage C65 +175 C65 +175 C65 +175 C65 +175 c package option 2 to-52 (h-03a) ad580jh ad580kh ad580lh ad580mh table 2. ad580s ad580t ad580u model min typ max min typ max min typ max units output voltage tolerance error from nominal 2.500 v output 25 1 10 10 mv output voltage change t min to t max 25 11 4.5 mv 55 25 10 ppm/c line regulation 7 v v in 30 v 1.5 6 2 2 mv 4.5 v v in 7 v 0.3 3 1 1 mv load regulation ?i = 10 ma 10 10 10 mv quiescent current 1.0 1.5 1.0 1.5 1.0 1.5 ma noise (0.1 hz to 10 hz) 8 8 8 v p-p stability long term 250 250 250 v per month 25 25 25 v temperature performance specified C55 +125 C55 +125 C55 +125 c operating C55 +150 C55 +150 C55 +150 c storage C65 +175 C65 +175 C65 +175 c package option 2 to-52 (h-03a) ad580sh ad580th ad580uh 1 specifications shown in boldface are tested on all production units at final electrical test. results from those tests are used to calculate outgoing quality l evels. all min and max specifications are guaranteed, although only those shown in boldface are tested on all production units. 2 h = metal can.
ad580 r e v. b | pa ge 4 o f 8 absolute maximum ratings table 3. p a r a m e t e r r a t i n g input voltage 40 v power dissi pati on @ 25c ambient temperature 350 mw derate above 2 5 c 2.8 mw/c lead temperature (soldering 10 sec) 300c t h ermal resista n ce j u n c t i o n - t o - c a s e 1 0 0 c junction-to-am b i e n t 3 6 0 c / w s t r e s s es a b o v e t h os e lis t e d u n de r a b s o l u t e m a xi m u m r a t i n g s ma y c a us e p e r m a n en t dama ge t o t h e de vice . this is a s t r e s s ra t i n g onl y ; f u n c t i o n al o p era t ion o f t h e de vice a t t h es e o r an y o t h e r con d i t io ns a b o v e t h os e list e d i n t h e o p era t io nal s e c t io n s o f t h is sp e c if ic a t io n is n o t i m pli e d . e x p o sur e t o a b s o l u t e max i m u m ra t i ng co ndi t i on s fo r ex ten d e d p e r i o d s ma y a f fe c t de vice r e l i ab i l i t y . ad580 chip dimensions and pad layout dimens ions s h own in inches and ( mill imeters ) . 00525-b - 002 *both e out pads must be connected to the output. 0.075 (1.90) e out * ?e +e 0.046 (1.16) fi g u r e 2 . the ad580 is als o a v a i la b l e in chi p f o r m . c o n s u l t th e f a c t o r y fo r sp e c if ica t ions a nd a p plic a t ion s info r m a t ion. esd caution esd (electrostatic discharge) sensitive device. ele c tros tatic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharge wi thout detection. although this product features proprietary esd protection circu i try, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. theref ore, prop er esd precautions a r e recommended to avoid perform a nce degradation or l o ss of functiona l ity.
ad580 r e v. b | pa ge 5 o f 8 theory of operation the ad580 fa mil y (ad580, ad581, ad584, ad589) us es th e b a ndga p con c e p t t o p r o d uce a s t a b le , lo w t e m p era t ur e co ef - f i cien t vol t a g e r e fer e n c e su i t ab le fo r hig h acc u rac y da t a ac q u i- si tio n com p on e n ts and sys t e m s. the de vice ma k e s us e o f the un derly i n g ph y s ica l na t u r e o f a si lico n t r a n sistor b a s e -e mi t t er v o l t a g e i n t h e fo r w a r d-b i as e d op era t i n g r e g i o n . a l l s u ch t r a n - sis t o r s ha v e a p pr o x ima t e l y a C2 mv/ c t e m p era t ur e co ef f i cien t, un sui t ab le fo r us e dir e c t ly as a l o w t c r e fer e n c e. e x t r a p ola t ion o f t h e t e m p er a t ur e cha r ac t e r i s t ic o f a n y o n e o f t h es e de vices t o ab s o lute z e ro ( w i t h a n e m i tte r c u r r e n t prop or - t i o na l to t h e ab s o lute te m p e r a t u r e ) , howe ve r , re ve a l s t h a t i t w i l l go to a v be of 1.205 v a t 0 k, as s h own in f i gu r e 3. th us, if a v o l t a g e co u l d be de ve lo p e d w i t h a n o p p o sin g t e m p er a t ur e co ef f i cien t t o s u m wi t h v be t o t o tal 1.205 v , a 0 t c r e f e r e n c e w o u l d r e s u l t a nd op e r a t ion f r om a s i ng l e , l o w vol t age sup p ly wou l d b e p o ss ibl e . the ad580 cir c ui t p r o v ides s u ch a com p en s a t i n g v o l t a g e , v1 in f i gur e 4, b y dr i v in g tw o tra n sist o r s a t dif f er en t c u r r en t den s i t ie s a nd am plif y i n g t h e r e su l t i n g v be dif f er en ce (? v be whic h n o w has a p o si t i v e tc). th e s u m, v z , is t h en b u f f er e d an d a m plif ie d u p t o 2.5 v t o p r o v ide a us a b le r e fer e n c e-v o l t a g e o u t p ut. f i gur e 5 s h o w s t h e s c hema tic dia g ra m o f th e ad580. the ad580 o p era t es as a 3-t e r m inal r e f e r e n c e , m e anin g tha t no a d d i t i on a l c o m p one n t s are re q u i r e d f o r bi a s i n g or c u r r e n t s e t t in g. the co nn ec tion dia g ra m, f i gur e 6, is q u i t e sim p le . 1.5 1.0 1.205 0.5 0 ?273 c ? 200 c ? 100 c 100 c 0 c 0k 73k 173k 373k 273k 00525-b - 003 temperature j unction v o ltage (v ) for both devices required compensation voltage ? same devices v be vs. temperature for two typical devices (i e t) constant sum = 1.205v f i g u re 3. e x t r a p o l a t ed v a ri at i o n of b a s e -e mit t e r v o lt ag e wit h t e mper at ure (i e t ), and requ ired c o mp ens a tion, sho w n fo r t w o d i ffer e nt devic e s 00525-b - 004 r7 r8 r2 r1 i 2 ? i 1 2i 1 = i 1 + i 2 +v in com r4 r5 q2 8a q1 a v 1 = 2 ? v be r 1 r 2 ? v be v be (q1) v out = v z 1 + = 2.5v r 4 r 5 = v be + 2 ? v be r 1 r 2 = v be + 2 l n r 1 r 2 kt q j 1 j 2 = 1.205v v z = v be + v 1 f i gure 4 . ba si c ban d ga p - re ferenc e regul a to r cir c ui t 00525-b - 005 com r12 r13 r7 q14 q3 q13 q7 q4 q10 q11 q12 q15 q5 q6 q8 q9 q2 8a q1 a r2 r1 r3 r6 c1 r11 r5 r4 r9 r10 r8 ?e +e 2.5v out fi g u r e 5 . s c h e m a t i c d i a g r a m 00525-b - 006 +e 4.5 v in 30v ?e e out load ad580 f i gure 6. conne c t ion d i agr a m voltage variation versus temperature s o me co nf usio n ex ists in t h e a r e a o f def i nin g and sp e c if y i n g r e fer e n c e v o l t a g e er r o r o v er t e m p era t ur e . h i s t o r ical l y , r e fer e n c es a r e cha r ac ter i z e d usin g a max i m u m d e v i a t io n p e r deg r e e c e n t ig rade; i.e . , 10 p p m / c. h o w e v e r , b e c a us e o f t h e i n c o ns i s te n t no n l i n e a r i t i e s i n z e ne r re fe re nc e s ( b utte r f ly or s ty p e cha r ac ter i st ics), m o st man u fac t ur ers us e a max i m u m lim i t e r ror b a nd appr o a ch to ch ar a c t e r i z e t h e i r re f e re nc e s . t h i s t e chni q u e m e asur es t h e o u t p u t v o l t a g e a t 3 t o 5 dif f er en t t e m p era t ur es and gua r an t e es t h a t t h e o u t p ut v o l t a g e de v i a t io n w i ll fall w i th i n th e g u a r a n t e e d err o r ba n d a t th ese d i sc r e t e t e m p e r a t u r e s . t h i s a p p r o a c h , o f c o u r s e , m a k e s n o m e n t i o n o r gua r a n te e o f p e r f o r ma n c e a t an y o t h e r t e m p era t ur e w i t h i n t h e o p era t i n g t e m p era t ur e ra n g e o f t h e de vice .
ad580 r e v. b | pa ge 6 o f 8 the co n s ist e n t v o l t a g e v e rs us tem p er a t ur e p e r f o r ma n c e o f a typ i cal ad580 is s h own in f i gu r e 7. n o t e tha t t h e c h a r ac t e r i s t ic is q u asi - p a ra b o l i c, n o t t h e p o ssib le s ty p e cha r a c t e r i st ics o f cl a s s i c a l z e n e r re f e re nc e s . t h i s p a r a b o l i c ch ar a c te r i st i c p e r m it s a maxim u m o u t p u t d e v i a t ion sp e c if ica t ion o v er t h e d e vice s f u l l o p era t i n g t e m p era t ur e ra n g e , ra t h er t h a n j u s t a t 3 t o 5 dis c r e t e t e m p era t ur es. 2.51 2.50 2.49 2.48 2.47 2.46 ?55 ? 30 0 2 5 5 0 7 5 100 125 00525-b - 007 temperature ( c) output voltage (v) maximum voltage change from 0 c to 70 c f i g u re 7. t y pic a l a d 58 0 k o u t p ut v o lt ag e v s . t e mpe r at u r e the ad580m g u a r a n t e es a maxim u m de via t io n o f 1.75 mv ove r t h e 0 c to 7 0 c te m p e r a t u r e r a nge. th i s c a n b e s h ow n to b e e q ui va le n t to 10 p p m / c a v e r a g e max i m u m; i . e., average c ppm v c m v max / 10 5 . 2 1 70 ma x 75 . 1 = the ad580 typ i cal l y exhi b i ts a va r i a t ion o f 1.5 mv o v er th e p o w e r s u p p l y ra n g e o f 7 v t o 30 v . f i gur e 8 is a p l o t o f ad580 lin e r e j e c t io n vers us f r eq uen c y . noise performance f i gur e 9 r e p r es en ts t h e p e ak-t o-p e ak n o is e o f t h e ad580 f r o m 1 h z (3 db p o i n t) to a 3 db h i g h end sh o w n o n t h e h o r i zo n t a l axis. p e a k -t o- p e a k n o is e f r o m 1 h z t o 1 m h z is a p p r o x im a t e l y 600 v . 140 130 0 10 20 30 40 50 60 70 80 90 100 110 120 10 100 1k 10k 100k 00525-b - 008 line frequency (hz) e out , p-p (mv) ad580 k e out p-p e = 23v p-p e = 18.5v e in composite (17v v in 30v) f i g u re 8. a d 58 0 li n e r e je c t io n p l ot 1mv 100 v 10 v 0 100 1k 10k 100k 1m 00525-b - 009 frequency (hz) p e ak-to-p e ak nois e f i g u re 9. p e ak -t o - p e ak o u t p ut n o is e v s . f r eque nc y 00525-b - 010 5v 500 a f i gure 1 0 . input c u rr ent vs . input v o l t a g e (integr a l l o a d s ) the ad580 as a current limiter the ad580 r e p r es en ts an exce l l en t al t e r n a t i v e to c u r r en t limi t e r dio d es t h a t r e quir e fac t o r y s e le c t io n to achi e v e a desir e d c u r r en t. this a p p r o a ch o f t e n r e su l t s in t e m p era t ur e co ef f i cien ts o f 1%/c. th e ad580 a p p r o a c h is n o t limi t e d t o a s p ec ial l y se l e ct ed f a ct o r y se t cu rr e n t l i m i t; i t c a n be p r ogra mm ed f r o m 1 ma t o 10 ma wi t h t h e in s e r t io n o f a sin g le ex t e r n al r e sis t o r . the a p p r o x ima t e t e m p era t ur e c o ef f i cien t o f c u rr en t limi t fo r t h e ad580 us ed in this m o de is 0.1 3 %/c f o r i lim = 1 ma and 0.01%/c f o r i li m = 13 ma (s ee f i gur e 11). f i gur e 10 dis p l a ys th e hig h o u t p u t im p e dan c e o f th e ad580 us e d as a c u r r en t limi ter f o r i lim = 1, 2, 3, 4 , a n d 5 ma. 00525-b - 011 bottom view of 2.5v precision reference circuit in to-52 case ad580 v+ v? output r load 2.5v 2.5v r i ? + 1ma f i gure 11. a t w o - compon ent p r ec isi o n cur r ent l i m i ter
ad580 r e v. b | pa ge 7 o f 8 the ad580 as a low power, low voltage, precision reference for data converters the ad580 has a n u m b er o f f e a t ur es tha t mak e i t ideal l y s u i t e d fo r us e wi t h a/ d an d d / a da t a co n v er t e rs us e d in com p lex micr o p r o ces s o r -bas e d sys t em s. the cal i b r a t e d 2 . 500 v o u t p u t mini mi zes us er t r im r e q u ir e m e n ts and a l lo ws o p er a t ion f r o m a sin g le , lo w v o l t a g e s u p p l y . l o w p o w e r co n s um p t io n (1 ma q u ies c en t c u r r en t) is co mm e n sura t e wi t h t h a t o f cmos-typ e de vices, w h i l e t h e lo w cos t and smal l p a cka g e c o m p le m e n t s t h e de cr e a sin g cos t a nd size o f the l a t e st con v er t e rs. f i gur e 12 s h o w s th e ad580 us e d as a r e f e r e n c e f o r th e ad7542 12-b i t cm os d a c wi th com p l e t e micr o p r o cess o r in t e r f ace . the ad580 an d th e ad7542 a r e s p ecif ie d t o op era t e f r o m a sin g le 5 v su p p ly , t h us e l imin a t i n g t h e ne e d t o pr o v ide a 15 v p o w e r s u p p l y fo r t h e s o le p u r p os e o f o p era t i n g a r e fer e n c e . the ad7542 in c l udes thr e e 4-b i t da ta r e g i s t ers, a 12 -b i t d a c r e g i ster , a nd ad dr ess de co din g l o g i c. i t ma y t h us b e i n ter f ace d dir e c t l y t o a 4-, 8- o r 16-b i t da ta b u s. onl y 8 ma o f q u ies c en t c u r r en t f r o m t h e sin g le 5 v o l t su p p l y is r e q u ir e d t o o p era t e t h e ad7542 whic h is p a c k a g e d in a smal l , 16-p i n dip . th e ad544 o u t p ut a m pl if ier is a l s o lo w p o w e r , r e q u ir in g o n ly 2.5 ma q u ies c en t c u r r en t. i t s l a s e r - t r imm e d o f fs et v o l t ag e p r es er v e s t h e 1/ 2 l s b lin e a r i t y o f th e a d 7542k n wi th o u t use r tri m s, a n d i t typ i cal l y s e t t les t o 1/2 ls b in les s tha n 3 s. i t wil l p r o v ide the 0 v t o C2.5 v ou t p u t s w in g f r om 5 v s u p p lies . 00525- b- 012 7 d0 6 d1 5 d2 4 d3 ad7542 clr 13 from system reset from address bus a0 10 a0 a1 11 a1 wr 9 from wr cs 81 2 3 15 14 16 1 2 from address decoder ad7 ad0 system 8-bit data bus ad544l dgnd ?5v analog input agnd i out2 i out1 rfb v ref v dd 22pf 200 ? 500 ? gain adjust e out +e +5v ?e ad580 f i gure 12. l o w p o wer , l o w v o ltag e ref e r e nc e f o r th e ad 7542 m i crop r o cessor - co mpat ibl e , 12- bit da c
ad580 r e v. b | pa ge 8 o f 8 outline dimensions controlling dimensions are in inches; millimeters dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design 0.250 (6.35) min 0.150 (3.81) 0.115 (2.92) 0.050 (1.27) max 0.019 (0.48) 0.016 (0.41) 0.021 (0.53) max 0.030 (0.76) max base & seating plane 0.195 ( 4 .95) 0.178 ( 4 .52) 0.230 ( 5 .84) 0.209 ( 5 .31) 0.500 (1 2 . 7 0 ) mi n 0.046 (1.17) 0.036 (0.91) 0.048 (1.22) 0.028 (0.71) 0.050 (1.27) t.p. 3 1 0.100 (2.54) t.p. 0.050 (1.27) t.p. 45 t.p. 2 f i g u re 13. t o C 5 2 p a ckag e di me nsio ns sho w n i n i n che s a n d ( m il lim e t e r s) ordering guide model o u tp ut v o lt ag e to l e r a n c e t e mp era t ure c o efficient op er a t i n g t e mp era t ure r a n g e p a ck a g e o p t i on p a c k age descript ion ad580 jh 75 m v 85 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580kh 25 m v 40 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580lh 10 m v 25 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580lmh 10 m v 10 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580sh 25 m v 55 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580sh / 883b 25 m v 55 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580th 10 m v 25 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580u h 10 m v 10 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580u h/88 3 b 10 m v 10 p p m/ c C55c t o +125 c t o C52 h (m e t al can) ad580t c h i p s 1 0 m v d i e ? 2004 analo g de vices, inc. all rights reserve d . tra d em arks and registered tra d ema r ks are the prop erty of their respective owners . c00525-0-8/04( b)
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