2.5 v precision voltage reference ref03 rev. f 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 2.5 voltage out p ut, 0.6% ma x wide input vol t age range, 4.5 v to 33 v supply current 1.4 ma m a x output voltage tempco, 50 ppm/c max line regulation , 50 ppm/v ma x load regulatio n , 100 ppm/ma max extended in dustrial temperat ure range, ?40 c to +8 5c low cost gener a l description the ref03 p r e c isio n v o l t a g e r e fer e n c e p r o v i d es a s t a b l e 2.5 v out p ut , w i t h m i ni ma l change for v a r i a t i o ns i n s u pply vol t age, a m b i e n t t e m p era t ur e , o r lo ading co ndi tion s. s i n g le-su p p l y o p era t ion o v er a n in p u t v o l t a g e ra n g e o f 4.5 v t o 33 v wi th a c u r r en t dr a i n o f 1 ma and go o d tem p er a t ur e st ab i l i t y is achie v e d usin g a n i m p r o v e d b a nd ga p desig n . pr ima r i l y t a rget e d a t p r ice s e n s i t iv e a p pl ic a t io n s , t h e ref 03 is a v a i la b l e i n p l a s ti c mi n i d i p s a n d s u rfa c e-m o un t sm all o u tlin e p l as ti c p a c k a g es. f o r im p r o v ed p e r f o r ma n c e o r ?40c t o +125c o p era t ion, s e e t h e ad r03 da t a s h e e t. pin c o nfig ur a t ion 00372-f - 001 ref03 top view (not to scale) nc 1 v in 2 v temp 3 gnd 4 nc nc v out trim 8 7 6 5 nc = no connect. do not connect anything on these pins. some of them are reserved for factory testing purposes. f i g u re 1. 8-l e ad pd ip ( p -suf f i x ) , 8-l e ad soi c (s-suffix) 00372- f- 002 c1 r3 r6 r4 r5 r1 q1 r2 r10 output ground r12 = 16.7k ? trim q19 r15 input q15 q18 q16 q13 q21 q17 r13 q20 q4 q3 q5 q6 q9 q7 q14 q12 q11 q8 r8 r7 r14 q10 q2 r11 = 2k ? r9 = 50k ? 4 5 6 1.23v 2 f i g u re 2. s i mp lif ied s c h e m a t i c
ref03 rev. f | page 2 of 8 table of contents electrical specifications ................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 typical performance characteristics ............................................. 5 applications ....................................................................................... 6 generating an adjustable bipolar voltage reference .............. 6 generating a ?2.5 v reference ....................................................6 boost transistor provides high output current ......................6 cmos dac reference .................................................................7 outline dimensions ..........................................................................8 ordering guide .............................................................................8 revision history 6/04data sheet changed from rev. e to rev. f updated formatting......................................................................universal changes to simplified schematic........................................................1 changes to electrical specifications ............................................3 changes to ordering guide....................................................................8 2/04data sheet changed from rev. d to rev. e. changes to simplified schematic........................................................1 changes to electrical specifications .............................................2 changes to ordering guide....................................................................3 replaced tpc 1 ................................................................................................4 8/03data sheet changed from rev. c to rev. d. updated format...............................................................................universal change to features.....................................................................................1 change to general description ..........................................................1 deleted wafer te st limits.......................................................................2 changes to electrical specifications .............................................2 changes to ordering guide....................................................................3 added outline dimensions ...................................................................7 revision 0: initial version
ref03 r e v. f | pa g e 3 of 8 electrical specifications @ v in = 15 v , ? 40c t a + 8 5 c , u n l e ss o t h e r w i s e note d. table 1. ref03g p a r a m e t e r s y m b o l c o n d i t i o n s m i n t y p m a x u n i t output voltage v o no l o a d 2 . 4 8 5 2 . 5 0 0 2 . 5 1 5 v output voltage tolerance no load 0.2 0.6 % o u t p u t voltage temperature coefficient 1 tcv o 1 0 5 0 p p m / c line regulation v in = 4.5 v to 33 v 20 50 ppm/v 0 . 0 0 2 0 . 0 0 5 % / v load regulation i l = 0 ma to 10 ma 60 100 ppm/ma 0 . 0 0 6 0 . 0 1 0 % / m a load current (s ourcing) i l 1 0 m a load current (si n king) i s ? 0 . 3 ? 0 . 5 m a short-circuit output current i sc output shorted to ground 24 ma quiescent supp ly current i sy n o l o a d 1 . 0 1 . 4 m a turn-on settling time 2 t on t o 0.1% of final value 5 s output voltage noise e n p-p 0.1 hz to 10 hz 6 v p-p output a d j u stment range ?v tr im r pot = 10 k? 6 11 % input voltage range 4.5 15 33 v temperature voltage output 3 v t 6 2 0 m v 1 tcv o i s m e a s ur ed by t h e en dpoi n t m e t h o d, a n d i s eq ua l t o c ppm in c 125 10 5 2 c 40 v c 85 v 6 o o o o / . u 2 gua r a n t eed by des i gn . 3 limit current in or out of pin 3 to 50 na and capacitance on pin 3 to 30 pf. 00372-f - 003 ref03 v in gnd +18v ?18v + 10 p f + 10 p f 10 : 2 4 f i gure 3. bu rn-in c i r c u i t 00372-f - 004 ref03 v in gnd v+ v out 2 4 5 6 v out trim 10k : f i g u re 4. o u t p ut v o lt ag e t r im m e t h od
ref03 r e v. f | pa g e 4 of 8 absolute maximum ratings t a = 2 5 c , u n l e ss ot he r w i s e no t e d. table 2. parameter rating input voltage 40 v output short-ci rcuit du r a t i o n i n d e f i n i t e operating tem p erature range ref03g (p, s) ?40c to +85c storage temperature range ?65c to +175c junction tempe r ature range ?65c to +175c lead temperature (soldering, 10 sec) 300c a b s o l u t e max i m u m r a tin g s a p p l y t o bo th d i c e a nd p a c k a g e d p a r t s, unles s o t h e r w is e n o t e d . s t r e s s es a b o v e t h os e list e d u nde r a b s o l u te m a xi m u m r a t i n g s ma y ca us e p e r m an e n t da ma g e t o t h e de vi ce . this is a s t r e s s ra t i ng o n ly ; f u nc t i on a l op e r a t i o n of t h e d e v i c e a t t h e s e or a n y ot he r c o n d it i o ns ab o v e t h o s e i n d i c a t e d i n t h e op e r a t i o n a l s e c t i o n of t h i s s p e c if ica t ion is not i m pl i e d. e x p o su re to ab s o lute m a x i m u m r a t i ng c o n d i t i ons for e x te nd e d p e r i o d s m a y af fe c t d e v i c e r e l i abi l it y . table 3. packa g e ther mal res i stance package type ja 1 jc unit 8-lead pdip (p) 110 50 c/w 8-lead soic (s) 160 44 c/w 1 ja is s p e c if i e d f o r wo rs t-cas e m o unting co nd itio ns , i.e . , ja i s sp eci f i e d for d e vi ce i n s o cket fo r pd ip pa cka g e; ja i s speci f i e d f o r devi c e s o l d er ed t o pri n t e d ci rcui t boa r d for soic package. 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.
ref03 r e v. f | pa g e 5 of 8 typical perf orm ance cha r acte ristics 20 19 18 17 16 15 14 10 15 20 25 30 35 40 00372- f - 005 input voltage (v) m a xi m u m lo ad current ( m a) t a = 25 c f i gure 5. m a xi m u m l oad cu rrent v s . in put vo l t a g e 65 60 55 50 45 4 8 12 16 20 24 28 32 00372- f - 006 input voltage ( ? v) lo ad reg u lati o n ( ppm / m a) t a = 25 c f i g u re 6. l o ad r e g u lat i on (?i l = 1 0 m a ) v s . input v o lt age 200 150 100 50 0 4 8 12 16 20 24 28 32 00372- f - 007 input voltage (v) lo ad reg u lati o n ( ppm / v ) t a = 25 c f i gure 7 . line regu la ti on vs . input v o l t a g e 35 30 25 20 15 10 5 0 ?40 ? 20 0 2 0 4 0 6 0 8 0 100 00372- f - 008 temperature ( c) m a xi m u m lo ad current ( m a) v in = 15v f i gure 8. m a xi m u m l oad cu rrent v s . t e m p er ature 1.2 1.1 1.0 0.9 0.8 ?40 ? 20 0 2 0 4 0 6 0 8 0 100 00372- f - 009 temperature ( c) q u i escent current ( m a) v in = 15v f i gure 9. q u i e s c ent current v s . t e mpe r atur e 92 82 72 62 52 42 32 22 10 32 100 320 1000 3200 10000 32000 10 100 1k 10k 100k 1m 00372- f - 010 frequency (hz) li ne re gulati on (db) li ne re gulati on (ppm/ v ) v in = 15v t a = 25 c fi g u r e 1 0 . l i n e r e g u l a t i o n v s . fr e q u e n c y 1.4 1.3 1.2 1.1 1.0 0.9 0.7 0.8 0.6 ? 4 0 ? 2 0 0 2 04 06 08 0 1 0 0 00372- f - 011 temperature ( c) load reg ? t/load reg (2 5 c) v in = 15v f i gure 1 1 . norm al iz ed l o a d regu l a t i on (?i l = 10 ma ) v s . t e mpe r at u r e 1000 100 10 1 10 100 1k 10k 100k 1m 00372- f - 012 frequency (hz) output noise ( v p-p) v in = 15v t a = 25 c f i gure 12. wideb a n d o u tput nois e v s . bandw i dth (0.1 hz to f r equ e nc y ind i c a ted) 3.2 5.9 8.6 00372- f - 013 output voltage noise ( v p-p) t a = 25 c v in = 15v 0.1hz to 10hz f i gure 13. t y pic a l d i s t ributi on of o u t p ut v o lt ag e n o is e 01 5 3 0 4 5 ?4 5 ? 3 0 ?1 5 00372- f - 014 output voltage tempco (ppm/ c) ?4 0 c t a +85 c v in = 15v f i gure 14. t y pic a l d i s t ributi on of o u t p ut vo l t a g e t e m p c o
ref03 r e v. f | pa g e 6 of 8 appli c ations the ref03 p r o v ides a s t a b le 2. 5 v o u t p u t v o l t ag e wi th minima l dep e nde n c e on lo ad c u r r en t, li ne vol t a g e, o r te m p er a t ur e. this v o l t a g e is typ i ca l l y us e d t o s e t an a b s o l u t e r e fer e n c e p o i n t i n da ta con v ersion cir c ui ts, o r in an alog cir c ui ts suc h as log a m ps , 4 t o 20 ma tra n smi t t e rs an d p o w e r s u p p lies. th e ref03 is o f p a r t ic u l a r va l u e in sy st e m s r e q u ir in g a p r e c ision r e fer e n c e using a s i ng l e 5 v su pply r a i l . b e ca us e a n on- b o a r d o p era t io n a l a m plif ier is us e d t o am plif y th e basic ban d g a p ce l l v o l t a g e to 2.5 v , s u p p l y deco u p ling is cr i t ical t o t h e t r a n sien t p e r f o r ma n c e o f a v o l t a g e r e fer e n c e . the su p p ly l i ne s h ou l d b e b y p a ss e d wit h a 1 0 f t a n t a l u m c a p a c i tor in p a ral l e l wi th a 0.01 f t o 0.1 f cera mic ca p a ci t o r f o r bes t r e s u l t s, as sh o w n in f i gur e 15. the b y p a s s ca p a ci t o rs sh o u ld b e lo ca t e d as clos e t o t h e r e fer e n c e as p o s s i b le. i n ade q u a te b y p a ss ing c a n l e ad to i n st ab i l i t ie s . o u tput b y p a ss c a p a c i tor s are no t ge ne r a l l y re c o m m e n d e d. i f ne c e s s ar y for h i g h f r e q u e nc y output i m p e d a nc e re d u c t i o n , t h e ca pa ci ta n c e val u e used s h o u l d be a t l e a s t 1 f . 00372-f - 015 ref03 v in gnd v + 2.5v + 10 f 0.1 f 2 4 6 v out f i gure 15. bas i c connec t ions generating an adjustable bipolar voltage r e ference ther e is o f t e n a r e q u ir emen t fo r a n ad j u st a b le b i p o la r r e fer e n c e . a s i m p l e m e t h o d of ge ne r a t i ng su ch a re fe re nc e i s to c o n n e c t t h e out p ut of t h e r e f 0 3 to an op am p i n an a d ju st abl e g a i n co nf igura t io n, a s sho w n in f i gu r e 16. the t r im ma b l e r e sist o r is t h e n u s e d to ge ne r a te t h e de s i re d output volt a g e f r om ? 2 . 5 v to +2.5 v . 00372-f - 016 ref03 v in gnd v+ v+ 2 3 4 6 7 +15v 50k ? 2 4 6 v out op97 50k ? 50k ? v out ?2.5v to +2.5v f i gure 16. adjus t able b i pol a r r e f e rence generating a ?2.5 v reference of t e n, t h er e is a r e q u ir em e n t for a nega t i ve r e fer e n c e v o l t a g e . t h e s i m p l e st m e t h o d of ge ne r a t i ng a ? 2 . 5 v re fe re nc e w i t h t h e ref03 is t o co nn ec t an o p am p in a gain o f ?1 to th e o u t p u t , as sho w n i n f i gur e 17. this p r o v id es b o t h p o si t i ve a nd n e ga t i ve 2.5 v r e f e r e n c es . f i gur e 18 sh o w s a n ot h e r met h o d o f ob taining a ne g a t i ve re fe re nc e, i n w h i c h t h e c u r r e n t - out p ut el e m e n t i s a p n p tra n si st o r , w i th t h e r e f03 i n a se r v o loo p t o e n s u r e th a t th e ou t p u t r e main s 2.5 v b e lo w g r o u n d . 00372-f - 017 ref03 v in gnd v+ v? 2 3 4 6 7 2 4 6 v out op97 100k ? ?2.5v +2.5v 100k ? f i gure 1 7 . 2 .5 v referenc e 00372-f - 018 ref03 v in gnd 2 4 6 v out 1k ? 2k ? +5v ? 2.5v ?5v 2n2905 +6.2v f i gure 1 8 . ?2 .5 v referenc e boost tra n sist or pr ovi d es hig h out p ut current w h en a p plica t i o n s r e q u ir e m o r e t h a n 10 ma c u r r en t deli v e r y , an e x te r n a l b o o s t t r ans i stor m a y b e a d de d to t h e r e f 0 3 to p a ss t h e r e quir e d c u r r en t wi t h o u t dissi p a t i ng exces s iv e p o w e r wi t h i n t h e ic. the maxim u m c u r r en t o u t p ut t o t h e sys t em is b o u nde d on ly b y t h e c a p a bi l i t i e s of t h e b o o s t t r ans i stor . f i g u re 1 9 show s th i s t e c h ni q u e , w i th a n d w i t h o u t curr e n t lim i t i n g . c u r r en t limi t i ng ma y b e us e d to p r e v en t da mage t o t h e b o ost tra n sis t o r . f i gure 19a is a n exam p l e o f n o c u r r en t limi t, w h ile f i gur e 19b sho w s t h e li mi t t h a t o c c u rs w h en t h e v o l t a g e
ref03 r e v. f | pa g e 7 of 8 dr o p p e d acr o ss r2 exce e d s o n e v be (0.6 v). th e c u r r en t limi t is s e n s i t i v e t o t h e va r i a t io n s o f t h e dio d es fo r w a r d dr o p a nd t h e pnp s v be w i t h tem p er a t ur e, and w i l l de cr e a s e wi t h i n cr e a sin g te m p e r a t u r e. 00372-f - 019 ref03 v in gnd 2 4 6 v out 65 ? 2n2905 ? 2.5v v+ 2.49k ? a. no current limit b. current limiting ref03 v in gnd 2 4 6 v out r2 10 ? 2n2905 r1 40 ? ?2.5v 0ma to 100ma v? 2.49k ? 1n4148 f i gure 19. o u tput current bo os t cmos dac reference the ref03 makes a n exce l l en t r e fer e n c e fo r us e wi t h cmos a nd b i p o la r d a cs. f i gur e 20 sho w s t h e ref 03 co nn e c te d to t h e d a c8012, a 12 -b i t p a ral l e l lo adin g cm os d a c wi th mem o r y . w i t h an op43 ou t p ut a m pl if ier fo r fast s e t t l i ng, t h e c i r c ui t r e q u ir es les s than 3 ma w h en dr i v en f r o m t t l ga t e s, an d less tha n 2 ma w h en dr i v en f r o m cm os ga t e s. i n si t u a t ion s n o t r e q u ir in g t h e hi g h er sp e e d o f t h e o p 43, enhan c e d li n e a r i t y and s o me s a vi n g s i n p o w e r diss i p a t i o n can b e r e a l i z e d usin g a n o p 97 f o r th e o u t p u t am p l if ier . f i gur e 21 sh o w s a typ i cal m u l t i p ly in g d a c a p pli c a t ion usin g a ref03 r e f e r e n c e . 00372-f - 020 op amp is op43 if higher and faster setting is required, op97 if lower speed and higher linearity is required. 100 ? ref03 v in gnd 2 4 6 v out dac80102 v ref 19 db11 4 db0 15 dgnd 3 1 out 2 2 33pf 3 7 6 4 agnd v dd 18 r fb 20 digital input 33 ? v o = 0v to ?2.5v ?5 v +5v f i g u re 20. c m os da c r e f e r e nc e 00372-f - 021 1/2 dac80102* gnd virtual zero +2.5v v in v in < 2.5v p-p v in < 2.5v p-p v out v z v dd +12v ref03 v in gnd v out +12v 6.9k ? 6.9k ? 1 f + v out = ? d/256 v in with respect to virtual zero. *digital interface omitted for clarity. f i g u re 21. m u lt ip ly i n g c m os da c r e f e r e nce
ref03 r e v. f | pa g e 8 of 8 outline dimensions 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 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarit y 0.10 controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design compliant to jedec standards ms-012aa f i g u re 22. 8-l e ad s t anda r d s m a l l o u t l ine p a ckag e [soic ] nar r o w b o dy (r -8) s-suffix di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s) seating plane 0.015 (0.38) min 0.180 (4.57) max 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.060 (1.52) 0.050 (1.27) 0.045 (1.14) 8 1 4 5 0.295 (7.49) 0.285 (7.24) 0.275 (6.98) 0.100 (2.54) bsc 0.375 (9.53) 0.365 (9.27) 0.355 (9.02) 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) 0.015 (0.38) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 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 compliant to jedec standards mo-095aa f i g u re 23. 8-l e ad p l as t i c d u a l in-l ine p a ckag e [p dip ] (n-8) p - suffi x 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 part number initial accuracy temperature c o efficient temperature r a nge package option ref03gp 1 0.2% 10 ?40c to +85c pdip ref03gs 2 0.2% 10 ?40c to +85c soic ref03gs-ree l 2 0.2% 10 ?40c to +85c soic ref03gs-ree l 7 2 0.2% 10 ?40c to +85c soic ref03gsz-ree l 7 2, 3 0.2% 10 ?40c to +85c soic 1 burn-in is avail abl e on commercial and ind u s t r ial temperature range parts in p d ip package. 2 for avail abil ity and burn-in inf o rmatio n on so i c pa cka g e, con t a ct your loca l sa le s of fi ce. 3 z = pb-free part. ? 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 . c00372C0 C 6/04(f)
|
