View AD620ANZ_3259744.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

low cost low power instrumentation amplifier ad620 rev. g 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 . features easy to use gain set with one external re s istor (gain range 1 t o 10,000) wide power su pply range (2. 3 v to 18 v) higher performance than 3 o p amp ia desig ns avail a ble in 8-l ead dip and so ic packaging low power, 1.3 ma max s u pply current excellent dc pe rformance (b grade) 50 v max, input offset voltag e 0.6 v/c max, input offset dri f t 1.0 na m a x, in put bias curren t 100 db min common-mode rejection ratio (g = 10) low noise 9 nv/h z @ 1 k hz, input volta g e noise 0.28 v p-p noi s e (0.1 hz to 10 hz) excellent ac sp ecifications 120 k hz band width (g = 10 0) 15 s sett ling ti me to 0.01% applic ati o ns weigh scales ecg and medic a l instrum e nta t ion transducer int e rface data acq u isitio n systems industrial process controls battery-powered and portable equipment c o nnec t i o n di a g r a m ?i n r g ?v s +i n r g +v s ou tp u t re f 1 2 3 4 8 7 6 5 a d 620 top view 00775-0-001 f i gure 1. 8-l e ad pd ip (n), cerdi p ( q ), and soic (r) p a ck ages produc t d e scripti o n the ad620 is a lo w cos t , hig h acc u rac y in s t r u m e n t a t io n a m plif ier t h a t r e q u ir es o n ly o n e ext e r n a l r e sist o r t o s e t ga ins o f 1 t o 10,000. f u r t h e r m o r e , t h e ad620 f e a t ur es 8 - lead so i c and dip p a cka g i n g t h a t is sma l ler t h a n di s c r e te des i g n s a nd o f fers l o we r p o we r ( o n l y 1 . 3 m a m a x supply c u r r e n t ) , m a k i n g i t a g o o d f i t f o r ba t t er y-p o w e r e d , p o r t a b le (o r r e m o t e ) a p p l ica t io n s . the ad620 , wi t h i t s hig h acc u r a c y o f 40 p p m maxim u m non l i n e a r i t y , l o w of f s e t vo lt age of 5 0 v m a x , an d of f s e t d r i f t o f 0.6 v/c max, is ide a l fo r us e i n p r e c isio n da t a acq u isi t ion sys t em s, s u ch as w e ig h s c ales and t r a n s d ucer in ter f aces. f u r t h e r m o r e , th e lo w n o is e , lo w i n p u t b i as c u r r en t, a n d lo w p o w e r o f th e ad620 mak e i t w e l l s u i t e d f o r m e dical a p p l ica t ion s , s u ch as ec g an d n o ni n v asi v e b l o o d p r essur e m o n i to rs. the lo w in pu t b i as c u r r en t o f 1.0 na max is made p o s s i b le wi t h th e us e o f s u p er?eta p r o c es sin g in t h e in p u t sta g e . th e ad620 w o rks we l l as a p r e a m p lif i er d u e t o i t s lo w i n p u t v o l t a g e n o is e of 9 nv/ h z a t 1 kh z, 0.28 v p-p in t h e 0.1 h z t o 10 h z band , a nd 0.1 pa/ h z in p u t c u r r en t no is e . als o , t h e ad620 is w e l l s u i t e d f o r mu l t i p l e x e d ap p l i c at i o n s w i t h i t s s e t t l i n g t i m e o f 1 5 s t o 0.01%, an d i t s cos t is lo w en oug h t o enab le desig n s wi t h o n e in-am p p e r cha nnel. 0 5 10 1 5 20 30 , 000 5, 000 10, 000 15, 0 0 0 20, 0 0 0 25 , 0 0 0 0 to tal erro r, ppm o f full scale supply current (ma) ad620a r g 3 op amp in-amp (3 op-07s) 00775-0-002 f i g u re 2. th r e e o p a m p ia d e s i g n s v s . a d 62 0 source resistance ( ? ) 100m 10k 1k 10m 1m 100k 10,000 0.1 100 1,000 10 1 rti vo ltag e no ise (0.1 ? 10h z) ( v p-p) typical standard bipolar input in-amp ad620 super eta bipolar input in-amp g = 100 00775-0-003 f i gure 3. t o ta l v o lt age n o is e v s . s o ur ce r e sistance
ad620 rev. g | page 2 of 20 table of contents specifications .....................................................................................3 absolute maximum ratings ............................................................5 esd caution ..................................................................................5 typical performance characteristics ..............................................7 theory of operation .......................................................................13 gain selection..............................................................................16 input and output offset voltage ..............................................16 reference terminal .....................................................................16 input protection ..........................................................................16 rf interference............................................................................16 common-mode rejection.........................................................17 grounding....................................................................................17 ground returns for input bias currents.................................18 outline dimensions........................................................................19 ordering guide ...........................................................................20 revision history 12/04rev. f to rev. g updated format.................................................................. universal change to features............................................................................1 change to product description.......................................................1 changes to specifications.................................................................3 added metallization photograph....................................................4 replaced figure 4-figure 6 ..............................................................6 replaced figure 15 ............................................................................7 replaced figure 33 ..........................................................................10 replaced figure 34 and figure 35.................................................10 replaced figure 37 ..........................................................................10 changes to table 3 ..........................................................................13 changes to figure 41 and figure 42 .............................................14 changes to figure 43 ......................................................................15 change to figure 44 ........................................................................17 changes to input protection section ............................................15 deleted figure 9...............................................................................15 changes to rf interference section ..............................................15 edit to ground returns for input bias currents section...........17 added ad620chips to ordering guide ....................................19 7/03data sheet changed from rev. e to rev. f edit to features............................................................................1 changes to specifications .......................................................2 removed ad620chips from ordering guide ...................4 removed metallization photograph...........................4 replaced tpcs 1C3 ...........................................................................5 replaced tpc 12 ...............................................................................6 replaced tpc 30 ...............................................................................9 replaced tpcs 31 and 32...............................................................10 replaced figure 4 ............................................................................10 changes to table i...........................................................................11 changes to figures 6 and 7 ............................................................12 changes to figure 8 ........................................................................13 edited input protection section........................................13 added new figure 9........................................................................13 changes to rf interface section ............................................14 edit to ground returns for input bias currents section...............................................................................................15 updated outline dimensions .............................................16
ad620 rev. g | page 3 of 20 specifications typical @ 25c, v s = 15 v, and r l = 2 k?, unless otherwise noted. table 1. ad620a ad620b ad620s 1 parameter conditions min typ max min typ max min typ max unit gain g = 1 + (49.4 k?/r g ) gain range 1 10,000 1 10,000 1 10,000 gain error 2 v out = 10 v g = 1 0.03 0.10 0.01 0.02 0.03 0.10 % g = 10 0.15 0.30 0.10 0.15 0.15 0.30 % g = 100 0.15 0.30 0.10 0.15 0.15 0.30 % g = 1000 0.40 0.70 0.35 0.50 0.40 0.70 % nonlinearity v out = ?10 v to +10 v g = 1C1000 r l = 10 k? 10 40 10 40 10 40 ppm g = 1C100 r l = 2 k? 10 95 10 95 10 95 ppm gain vs. temperature g = 1 10 10 10 ppm/c gain >1 2 ?50 ?50 ?50 ppm/c voltage offset (total rti error = v osi + v oso /g) input offset, v osi v s = 5 v to 15 v 30 125 15 50 30 125 v overtemperature v s = 5 v to 15 v 185 85 225 v average tc v s = 5 v to 15 v 0.3 1.0 0.1 0.6 0.3 1.0 v/c output offset, v oso v s = 15 v 400 1000 200 500 400 1000 v v s = 5 v 1500 750 1500 v overtemperature v s = 5 v to 15 v 2000 1000 2000 v average tc v s = 5 v to 15 v 5.0 15 2.5 7.0 5.0 15 v/c offset referred to the input vs. supply (psr) v s = 2.3 v to 18 v g = 1 80 100 80 100 80 100 db g = 10 95 120 100 120 95 120 db g = 100 110 140 120 140 110 140 db g = 1000 110 140 120 140 110 140 db input current input bias current 0.5 2.0 0.5 1.0 0.5 2 na overtemperature 2.5 1.5 4 na average tc 3.0 3.0 8.0 pa/c input offset current 0.3 1.0 0.3 0.5 0.3 1.0 na overtemperature 1.5 0.75 2.0 na average tc 1.5 1.5 8.0 pa/c input input impedance differential 10||2 10||2 10||2 g?_pf common-mode 10||2 10||2 10||2 g?_pf input voltage range 3 v s = 2.3 v to 5 v ?v s + 1.9 +v s ? 1.2 ?v s + 1.9 +v s ? 1.2 ?v s + 1.9 +v s ? 1.2 v overtemperature ?v s + 2.1 +v s ? 1.3 ?v s + 2.1 +v s ? 1.3 ?v s + 2.1 +v s ? 1.3 v v s = 5 v to 18 v ?v s + 1.9 +v s ? 1.4 ?v s + 1.9 +v s ? 1.4 ?v s + 1.9 +v s ? 1.4 v overtemperature ?v s + 2.1 +v s ? 1.4 ?v s + 2.1 +v s + 2.1 ?v s + 2.3 +v s ? 1.4 v
ad620 r e v. g | pa ge 4 o f 2 0 ad62 0 a a d 6 2 0 b ad62 0s 1 param e t e r c o n d i t i o n s min typ max min typ max min typ max unit common-mode rejectio n ratio dc to 60 hz with 1 k? sour ce imb a lance v cm = 0 v to 10 v g = 1 73 90 80 90 73 90 db g = 1 0 93 110 100 110 93 110 db g = 1 00 110 130 120 130 110 130 db g = 1 000 110 130 120 130 110 130 db out p u t output s w ing r l = 10 k? v s = 2. 3 v to 5 v ?v s + 1.1 + v s ? 1.2 ?v s + 1. 1 + v s ? 1.2 ?v s + 1.1 +v s ? 1.2 v overtemperature ?v s + 1.4 +v s ? 1.3 ?v s + 1. 4 + v s ? 1.3 ?v s + 1.6 +v s ? 1.3 v v s = 5 v to 1 8 v ?v s + 1.2 +v s ? 1.4 ?v s + 1. 2 + v s ? 1.4 ?v s + 1.2 +v s ? 1.4 v o v e r t e m p e r a t u r e ?v s + 1.6 +v s C 1.5 ?v s + 1. 6 + v s C 1.5 Cv s + 2.3 +v s C 1.5 v short circuit current 18 18 18 ma dynamic res p o n se sm a ll sig n a l C 3 d b ba ndwidt h g = 1 1000 1000 1000 kh z g = 1 0 800 800 800 kh z g = 1 00 120 120 120 kh z g = 1 000 12 12 12 kh z sle w rate 0.75 1.2 0 . 7 5 1 . 2 0 . 7 5 1 . 2 v / s settling time to 0.01% 10 v step g = 1 C 100 15 15 15 s g = 1 000 150 150 150 s n o i s e vol t age noise, 1 k h z 2 2 ) / ( ) ( g e e noise rti total no ni + = input, vol t ag e noise, e ni 9 1 3 9 1 3 9 1 3 nv/ h z out p ut , voltage noise, e no 7 2 1 0 0 7 2 1 0 0 7 2 1 0 0 nv/ hz rti, 0.1 hz to 10 hz g = 1 3.0 3.0 6.0 3.0 6.0 v p- p g = 1 0 0.55 0.55 0.8 0.55 0.8 v p- p g = 1 00C1 000 0.28 0 . 2 8 0 . 4 0 . 2 8 0 . 4 v p- p current noise f = 1 k h z 100 100 100 fa/h z 0.1 hz t o 10 hz 10 10 10 pa p - p reference inp u t r in 2 0 2 0 2 0 k ? i in v in+ , v ref = 0 50 60 50 60 50 60 a voltage range ?v s + 1.6 +v s ? 1.6 ?v s + 1.6 +v s ? 1.6 ?v s + 1.6 +v s ? 1.6 v gain to out p ut 1 0.0 001 1 0.0 001 1 0.0 001 power s u p p l y operating range 4 2. 3 1 8 2. 3 1 8 2. 3 1 8 v quiescent current v s = 2. 3 v to 1 8 v 0 . 9 1 . 3 0 . 9 1 . 3 0 . 9 1 . 3 m a overtemperature 1.1 1. 6 1 . 1 1 . 6 1 . 1 1 . 6 m a tem p era t ure r a nge for specified perf ormance ?40 t o +8 5 ?40 t o +8 5 ?55 t o +1 25 c 1 see analog devices milit ary data sheet for 883b tested sp ecifications. 2 d o e s n o t i n clu d e e ffect s o f ext e rn a l re si st or r g . 3 on e i n put groun d e d. g = 1. 4 th i s i s de fi n e d a s t h e sa m e supply ra n g e t h a t i s u s ed t o s p eci f y psr .
ad620 r e v. g | pa ge 5 o f 2 0 absolute maximum ratings table 2. p a r a m e t e r r a t i n g supply voltage 18 v internal power dissip a tion 1 6 5 0 m w input vol t age (c ommon-mode) v s differential input voltage 25 v output short-ci rcuit du r a t i o n i n d e f i n i t e storage temperature range (q) ?65c to +150c storage temperature range (n, r) ?65c to +125c operating tem p erature range ad620 (a, b ) ?40c to +85c ad620 (s ) ?55c to +125c lead temperature range (soldering 10 seconds) 300c 1 specif ication is f o r d e vice in f r ee air: 8- lea d pla st i c pa ck a g e: ja = 95 c 8-lead c e rdip p a c k age: ja = 110c 8- lea d soic pa cka g e: ja = 155c 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 xim u m r a t i n g s ma y ca us e p e r m a n e n t dama ge to t h e de vi ce. t h is is a st r e ss r a t i ng on ly ; f u n c t i on a l op e r at i o n of t h e d e v i c e a t t h e s e or an y o t h e r con d i t ion s a b o v e t h o s e i ndic a te d i n t h e op er a t io na l s e c t io n o f t h is sp e c if ic a t io n is no t im pl ie d . e x p o sur e t o a b s o l u te max i m u m r a t i ng co ndi t i on s fo r ex tende d p e r i o d s ma y a f fe c t de vice rel i a b i l i t y . esd caution esd (electrostatic discharge) sensitive device. ele c trosta tic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharge with out 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.
ad620 r e v. g | pa ge 6 o f 2 0 00775-0-004 f i g u re 4. m e t a l l i z at ion p h ot og r a ph. d i mensions sh o w n in in ches and ( m m). c o nta c t s a le s fo r lat e st dim e nsio ns .
ad620 r e v. g | pa ge 7 o f 2 0 typical perf orm ance cha r acte ristics (@ 25c, v s = 15 v , r l = 2 k ? , u n l e ss ot he r w i s e no te d. ) input offset voltage ( v) 20 30 40 50 ? 4 0 0 40 80 p e rce ntage of units ?80 sample size = 360 10 0 00775-0-005 f i gure 5. t y pic a l d i stribution of i n put o ffset v o ltage input bias current (pa) 0 10 20 30 40 50 ? 600 0 600 p e rce ntage of units ? 1200 1200 sample size = 850 00775-0-006 f i gure 6. t y pic a l d i s t ributio n of i n put bias current 10 20 30 40 50 ?200 0 200 400 input offset current (pa) p e rce ntage of units ? 400 0 sample size = 850 00775-0-007 f i gure 7. t y pic a l d i stribution of i n put o ffset c u rr ent temperature ( c) inp u t bias curre nt (na) +i b ?i b 2.0 ?2.0 175 ?1.0 ?1.5 ?7 5 ?0.5 0 0.5 1.0 1.5 125 75 25 ?25 00775-0-008 f i gure 8. input bi as current v s . t e mpe r atur e change in offs e t v o ltage ( v) 1.5 0.5 warm-up time (minutes) 2.0 0 01 1.0 4 3 2 5 00775-0-009 f i gure 9. ch ange in input o ffset v o lt age vs . w a rm-up t i me frequency (hz) 1000 1 1 100k 100 10 10k 1k 100 volta ge n o ise ( n v/ h z ) gain = 1 gain = 10 10 gain = 100, 1,000 gain = 1000 bw limit 00775-0-010 f i g u re 10. v o lt ag e nois e spe c t r a l d e n s it y v s . f r equ e nc y (g = 1? 10 00)
ad620 r e v. g | pa ge 8 o f 2 0 frequency (hz) 1000 100 10 1 10 1000 100 curre nt nois e (fa/ hz) 00775-0-011 f i g u re 11. cur r ent nois e spe c t r a l d e n s it y v s . f r equ e nc y rti noise ( 2 .0 v/d i v) time (1 sec/div) 00775-0-012 f i g u re 12. 0. 1 h z t o 10 h z rti v o lt ag e nois e (g = 1) rti noise ( 0 .1 v/d i v) time (1 sec/div) 00775-0-013 f i g u re 13. 0. 1 h z t o 10 h z rti v o lt ag e nois e (g = 1 0 0 0 ) 00775-0-014 f i g u re 14. 0. 1 h z t o 10 h z cur r ent no is e , 5 pa /d iv 100 1000 ad620a fet input in-amp source resistance ( ? ) total drift from 25 c to 8 5 c, rti ( v) 100,000 10 1k 10m 10,000 10k 1m 100k 00775-0-015 f i gur e 1 5 . t o t a l drif t vs . so ur c e re si stanc e frequency (hz) cmr (db) 160 0 1m 80 40 1 60 0.1 140 100 120 100k 10k 1k 100 10 g = 1000 g = 100 g = 10 g = 1 20 00775-0-016 f i gure 16. t y pic a l c m r v s . f r equenc y , rti, zero to 1 k? s o ur c e imb a l a nce
ad620 r e v. g | pa ge 9 o f 2 0 frequency (hz) psr ( d b ) 160 1m 80 40 1 60 0.1 140 100 120 100k 10k 1k 100 10 20 g = 1000 g = 100 g = 10 g = 1 180 00775-0-017 f i g u re 17. p o s i t i ve psr v s . f r equ e nc y , rti (g = 1? 10 0 0 ) frequency (hz) psr ( d b ) 160 1m 80 40 1 60 0.1 140 100 120 100k 10k 1k 100 10 20 180 g = 10 g = 100 g = 1 g = 1000 00775-0-018 f i g u re 18. neg a t i ve psr v s . f r equenc y , rti (g = 1? 10 0 0 ) 1000 100 10m 100 1 1k 10 100k 1m 10k frequency (hz) gain ( v /v) 0.1 00775-0-019 fi g u r e 1 9 . g a i n v s . fr e q u e n c y output voltage (v p-p) frequency (hz) 35 0 1m 15 5 10k 10 1k 30 20 25 100k g = 10, 100, 1000 g = 1 g = 1000 g = 100 bw limit 00775-0-020 f i gure 2 0 . la r g e s i gna l f r equenc y r e sp o n se input voltage limit (v) ( r efer r e d to su pply volta ges) 20 +1.0 +0.5 5 0 +1.5 ? 1.5 ? 1.0 ? 0.5 15 10 supply voltage volts +v s ? 0.0 ?v s +0.0 00775-0-021 f i g u re 21. input v o l t ag e r a ng e v s . sup p ly v o lt ag e , g = 1 20 +1.0 +0.5 5 0 +1.5 ?1.5 ?1.0 ?0.5 15 10 supply voltage volts r l = 10k ? r l = 2k ? r l = 10k ? output voltage sw ing ( v ) ( r efer r e d to su pply volta ges) r l = 2k ? +v s ?v s 00775-0-022 ?0.0 +0.0 f i g u re 22. o u t p ut v o lt ag e sw ing v s . su p p ly v o lt ag e , g = 1 0
ad620 rev. g | page 10 of 20 output voltage swing (v p-p) load resistance ( ?) 30 0 0 10k 20 10 100 1k v s = 15v g = 10 00775-0-023 f i g u re 23. o u t p ut v o lt ag e sw ing v s . l oad r e s i s t an c e ... . . ... ... . . ... .. .. ... . . .. . . . . . . .. . . ... ... . . ... ... . . ... .. .. ... . . .. . . . . . . .. . . ... 00775-0-024 f i g u re 24. lar g e s i g n al p u ls e r e s p ons e and s e t t ling ti me g = 1 (0. 5 mv = 0.0 1 %) . ... .. .. ... . . ... . ... .. .. .. .. . ... .. .. .. .. . ... .. .. ... . . ... . ... .. .. .. .. . ... .. .. .. .. 00775-0-025 f i g u re 25. sm a ll s i g n al r e s p ons e , g = 1, r l = 2 k?, c l = 1 00 pf . . . . .. .. ... . . . . . . . . . . .. . . ... ... . . ... .. .. . . . . .. .. ... . . . . . . . . . . .. . . ... ... . . ... .. .. 00775-0-026 f i g u re 26. lar g e s i g n al r e s p ons e and s e t t l ing ti me , g = 10 ( 0 . 5 mv = 0. 01% ) . . . . .. .. ... . . ... .. .. . . . . . ... ... . . ... .. .. . . . . .. .. ... . . ... .. .. . . . . . ... ... . . ... .. .. 00775-0-027 f i g u re 27. sm a ll s i g n al r e s p ons e , g = 10 , r l = 2 k ? , c l = 10 0 pf ... . . ... ... . . ... .. .. ... . . ... ... . . ... .. .. ... . . ... ... . . ... .. .. ... . . ... ... . . ... .. .. 00775-0-030 f i g u re 28. lar g e s i g n al r e s p ons e and s e t t l ing ti me , g = 10 0 ( 0 .5 mv = 0.0 1 % )
ad620 rev. g | page 11 of 20 .. .. . ... .. .. . ... .. .. ... . . ... .. .. . ... . ... .. .. . ... .. .. . ... .. .. ... . . ... .. .. . ... . ... 00775-0-029 f i g u re 29. sm a ll s i g n al p u ls e r e s p ons e , g = 10 0, r l = 2 k ? , c l = 100 pf ... . . ... ... . . ... .. .. ... . . ... ... . . ... .. .. ... . . ... ... . . ... .. .. ... . . ... ... . . ... .. .. 00775-0-030 f i g u re 30. lar g e s i g n al r e s p ons e and s e t t l ing ti me , g = 10 00 (0. 5 mv = 0. 01% ) .. .. . ... .. .. . ... .. .. ... . . ... .. .. . ... . ... .. .. . ... .. .. . ... .. .. ... . . ... .. .. . ... . ... 00775-0-031 f i g u re 31. sm a ll s i g n al p u ls e r e s p ons e , g = 10 0 0 , r l = 2 k? , c l = 100 pf output step size (v) settling time ( s) to 0.01% to 0.1% 20 0 02 15 5 5 10 10 0 15 00775-0-032 f i gure 32. s e ttl ing t i me v s . step si z e (g = 1) gain settling time ( s) 1000 1 1 1000 100 10 10 100 00775-0-033 f i g u re 33. s e t t l ing ti me to 0. 01% v s . g a in, f o r a 1 0 v st ep ... . . ... .. .. .. .. ... . ... . . ... .. .. .. .. ... . ... . . ... .. .. .. .. ... . ... . . ... .. .. .. .. ... . 00775-0-034 f i g u re 34. g a in n o nlin ea ri t y , g = 1, r l = 1 0 k ? (1 0 v = 1 p p m)
ad620 rev. g | page 12 of 20 . ... .. .. . . . . .. .. .. .. ... . . ... .. .. . . . . . . . . . ... .. .. . . . . .. .. .. .. ... . . ... .. .. . . . . . . . . 00775-0-035 f i g u re 35. g a in n o nlin ea ri t y , g = 1 00, r l = 1 0 k? (1 00 v = 10 ppm ) . . . . .. .. . . . . . ... .. .. ... . . .. . . . . . ... . ... . . . . . .. .. . . . . . ... .. .. ... . . .. . . . . . ... . ... . 00775-0-036 f i g u re 36. g a in n o nlin ea ri t y , g = 1 0 0 0 , r l = 10 k? (1 mv = 10 0 p p m) a d 620 v ou t g= 1 g = 100 0 49 . 9 ? 10 k ? * 1k ? 10 t 10 k ? 49 9 ? g=1 0 g= 1 0 0 5. 49 k ? +v s 11 k ? 1k ? 100 ? 1 00k ? i n pu t 10v p-p ?v s *all resistors 1% tolerance 7 1 2 3 8 6 4 5 00775- 0- 037 f i gure 3 7 . settli n g t i m e t e st cir c ui t
ad620 rev. g | page 13 of 20 theory of operation v b ?v s a1 a2 a3 c2 r g r1 r2 gain sense gain sense r3 400 ? 10k ? 10k ? i2 i1 10k ? ref 10k ? +in ? in 20 a 20 a r4 400 ? output c1 q2 q1 00775- 0- 038 f i g u re 38. si mpl i f i e d s c h e m a t i c of a d 62 0 the ad620 is a m o n o li t h ic ins t r u m e n t a t ion am p l if ier bas e d on a m o d i f i c a t i on of t h e c l a s s i c t h re e op am p a p pro a ch . a b s o lute val u e t r immi n g al lo ws t h e us er to p r og ra m ga in acc u r a tel y (t o 0.15% a t g = 100) wi t h o n ly o n e r e sis t o r . m o n o li thic co n s tr ucti o n a n d la s e r w a f e r tri m m i n g allo w t h e ti gh t m a t c h i n g a nd t r acki n g o f cir c ui t com p onen ts, t h us en s u r i n g t h e hig h le ve l of p e r f or m a nc e i n he re n t i n t h i s c i rc u i t . the i n p u t t r an sis t o r s q1 a nd q 2 p r o v ide a sin g le dif f er en t i al- p a ir b i p o la r in pu t fo r hig h p r e c isio n (f igur e 38) , yet o f fer 10 lo w e r in pu t b i as c u r r en t t h a n ks t o s u p er?et a p r o c es sing. f eed back thr o u g h t h e q1-a1-r1 lo o p a nd t h e q2-a2-r2 lo o p ma in t a in s co n s t a n t col l e c t o r c u r r en t o f t h e in pu t de vi ces q1 a nd q2, t h er eb y im p r es si n g t h e in p u t v o l t a g e ac r o s s t h e ext e r n a l ga in s e t t in g r e sist o r r g . this cr e a t e s a dif f er en t i al ga in f r o m t h e in p u ts t o t h e a1 /a2 o u t p u t s g i ven b y g = ( r1 + r2 )/ r g + 1. t h e un i t y-ga in s u b t r a ct o r , a3, r e m o v e s a n y co mm o n -m o d e si gn al, y i el din g a sing le -ende d o u tp u t refer r e d to t h e r e f p i n p o ten t ia l. the val u e o f r g also d e t e rmin e s th e tra n sco n d u cta n ce o f t h e pre a m p s t ag e. as r g is r e d u ce d fo r la rger ga in s, t h e tra n s c on d u c t ance in cr eas e s asy m p t o t ical l y t o t h a t o f t h e in p u t tra n sis t o r s. this has thr e e im p o r t a n t ad v a n t a g e s : (a) o p en-lo o p ga in is b o ost e d fo r in cr e a sin g pr og ra mm e d ga i n , t h us r e d u cing ga in r e la te d er ro rs. (b) th e gai n -b andwi d t h p r o d uc t (deter mi n e d b y c1 a nd c2 and t h e p r e a m p t r a n s c o n d u c t an c e ) i n cr ease s w i t h p r ogra m m ed ga in , th us o p t i mi z i n g f r eq ue n c y r e s p o n s e . (c) the in pu t v o l t a g e n o is e is r e d u ce d t o a val u e o f 9 nv/ h z , dete r m ine d main ly b y t h e col l e c to r c u r r en t an d b a s e r e s i s t a n ce o f t h e i n p u t devi ce s . the i n ter n a l gai n r e sisto r s, r1 and r2, a r e t r im m e d to a n a b s o l u t e val u e of 24.7 k?, al lo win g t h e ga in t o be p r og ra mmed acc u ra tely w i t h a sin g le ex t e r n a l r e sist o r . the ga i n e q u a t i o n is t h en 1 4 . 49 + ? = g r k g 1 4 . 49 ? ? = g k r g ma ke vs . bu y: a ty pic a l bri d ge applicatio n error budget the ad620 o f f e rs im p r o v e d p e r f o r ma n c e o v er h om eb r e w thr e e o p a m p i a desig n s, alo n g wi th smal ler s i ze , fe w e r co m p on e n ts, and 10 lo w e r su pply c u r r en t. i n t h e typ i c a l a p p l ic a t ion, sh o w n in f i gur e 39 , a ga in o f 100 is r e q u ir ed t o am pl i f y a br i d g e output of 2 0 m v f u l l - s c a l e ove r t h e i n d u st r i a l t e m p era t ur e ra ng e o f ?40c t o +85c. t a b l e 3 sh o w s ho w t o calc u l a t e t h e ef fe c t va r i o u s er r o r s o ur ces ha v e on cir c ui t acc u rac y .
ad620 rev. g | page 14 of 20 rega r d les s o f t h e sys t em in whic h i t is bein g us ed , t h e ad620 p r o v i d es gr ea t e r a c cura c y a t l o w po w e r a n d p r i c e . i n si m p l e sys t em s, a b s o l u te acc u rac y a n d dr if t er r o rs a r e b y fa r t h e m o s t sig n if ican t co n t r i b u t o rs t o er r o r . i n m o r e co m p l e x sys t em s wi t h an i n te l l ig e n t p r o c ess o r , a n a u t o ga in/a ut ozer o c y cle wi l l r e m o ve a l l a b s o lu te acc u r a c y a nd dr if t er r o rs, le a v in g o n ly t h e re s o lut i on e r ror s of g a i n , non l i n e a r i t y , an d noi s e, t h u s a l l o w i ng f u l l 14-b i t ac c u rac y . n o t e t h a t fo r t h e h o m e b r e w circ ui t, t h e op07 sp e c if ic a t io n s fo r in p u t v o l t a g e o f fs et a nd n o is e ha v e b e e n m u l t i p lie d b y 2. this is b e c a us e a t h re e o p a m p typ e in-am p has tw o o p a m ps a t i t s i n p u t s , b o t h c o n t ri b u ti n g t o th e o v e r a l l i n p u t e r r o r . r = 350 ? 10v precision bridge transduce r r = 350 ? r = 350 ? r = 350 ? 00775-0-039 ad620a monolithic instrumentation amplifier, g = 100 supply current = 1.3ma max ad620a r g 499 ? reference 00775-0-040 f i g u re 39. m a k e v s . buy "homebrew" in-amp, g = 100 *0.02% resistor match, 3ppm/ c tracking **discrete 1% resistor, 100ppm/ c tracking supply current = 15ma max 100 ? ** 10k ? * 10k ? ** 10k ? * 10k ? * 10k ? ** 10k ? * op07d op07d op07d 00775-0-041 table 3. make vs. buy error b u dget error, ppm of fu ll scal e error so urce ad62 0 circ uit c a lculation homebre w ci rcuit calc ulatio n ad62 0 homeb r ew absolut e accuracy at t a = 25 c input offset volt age, v 125 v/2 0 mv (150 v 2 )/20 mv 6,250 10,607 output offset vo ltage, v 1000 v/ 100 mv / 20 mv ((150 v 2)/1 00 )/20 mv 500 150 input offset current, na 2 na 35 0 ?/2 0 mv (6 na 350 ?) /20 mv 18 53 cmr, db 110 db(3.1 6 ppm ) 5 v/2 0 mv (0.02% match 5 v)/20 mv/1 00 791 500 total abso lute er ror 7,559 11,310 dr ift to 8 5 c gain drift, ppm/ c (50 ppm + 10 pp m) 60c 100 p p m/c trac k 6 0 c 3,600 6,000 input offset volt age drift, v/c 1 v/c 60c / 2 0 mv (2.5 v/c 2 60c)/20 mv 3,000 10,607 output offset vo ltage drift, v/c 15 v /c 6 0 c/ 100 mv/ 20 mv (2.5 v/c 2 6 0 c)/100 mv/ 20 mv 450 150 total drift error 7,050 16,757 resolu tion gain nonli n earity, ppm of full sc ale 40 ppm 40 ppm 40 40 typ 0.1 h z to 1 0 hz vo ltage noise, v p- p 0. 28 v p- p/2 0 mv (0.38 v p - p 2 )/20 mv 14 27 total reso lution error 54 67 grand tota l error 14,663 28,134 g = 100, v s = 15 v . (al l er r o rs are min/max an d r e f e rr e d t o i n put . )
ad620 rev. g | page 15 of 20 3k ? 5v digital data output adc ref in agnd 20k ? 10k ? 20k ? ad620b g = 100 1.7ma 0.10ma 0.6ma max 499 ? 3k ? 3k ? 3k ? 2 1 8 3 7 6 5 4 1.3ma max ad705 00775-0-042 f i g u re 40. a p r es s u re m o n i t o r c i r c u i t t h at o p er ates on a 5 v sing l e su p p ly pressu re measu r ement al t h o u g h us ef u l in man y b r i d ge a p plic a t io n s , su ch as w e i g h s c ales, t h e ad6 20 is es p e c i al l y s u i t ab le fo r hig h er r e sis t an ce p r es s u r e s e ns o r s p o w e r e d a t lo w e r v o l t a g es w h er e smal l size and l o w p o we r b e c o me more s i g n i f i c an t . f i g u re 4 0 s h o w s a 3 k ? pre ssu re t r ans d u c e r br i d ge p o we re d f r o m 5 v . i n s u ch a cir c u i t, t h e b r idg e co n s u m es o n l y 1.7 ma. a d din g t h e ad620 a nd a b u f f er ed v o l t a g e divider al lo ws t h e sig n al t o b e condi tion e d f o r o n l y 3.8 ma o f t o ta l s u p p l y c u r r en t. s m al l size an d l o w cos t make t h e ad620 es p e c i al l y a t trac ti ve f o r v o l t a g e o u t p u t pr es s u r e t r a n s d ucers. si n c e i t de l i v e rs lo w n o is e a nd dr if t, i t wi l l a l s o s e r v e a p pli c a t io ns such as d i a g n o st ic n o n i n v asi v e b l o o d p r essur e m e asur em e n t . medi cal ecg the lo w c u r r en t n o is e o f t h e ad620 al lo ws i t s us e in ec g m o ni t o rs (f igure 41) wher e hig h s o ur ce r e sis t an ces o f 1 m? o r hig h er a r e n o t u n co mm on. the ad620 s lo w p o w e r , lo w s u p p l y vol t a g e r e q u ir e m e n ts, and sp ac e-s a v i n g 8-le ad mini -dip and so i c p a cka g e of fer i n g s mak e i t a n exce l l en t ch o i ce fo r b a t t er y- p o we re d d a t a re c o rd e r s . f u r t h e rm o r e , th e l o w b i a s cu rr en t s a n d l o w cu r r e n t n o i s e , co u p le d wi t h t h e lo w v o l t a g e n o is e o f t h e ad62 0, im p r o v e t h e d y n a mic ran g e f o r bet t e r p e r f o r ma n c e . the val u e o f ca p a ci t o r c1 is chos en t o ma i n t a i n s t ab i l i t y o f t h e r i g h t leg dr iv e lo o p . p r o p er s a fegua r ds, s u ch as is ol a t io n, m u st b e adde d to t h is cir c ui t t o p r o t e c t t h e p a t i en t f r o m pos s i b l e h a r m . g = 7 ad620a 0.03hz high- pass filter output 1v/mv +3v ?3 v r g 8.25k ? 24.9k ? 24.9k ? ad705j g = 143 c1 1m ? r4 10k ? r1 r3 r2 output amplifier patient/circuit protection/isolation 00775-0-043 f i gure 41. a medi c a l e c g m o ni to r ci r c uit
ad620 rev. g | page 16 of 20 precision v-i c o nverter t h e a d 6 2 0 , a l ong w i t h a n ot he r op am p a n d t w o re s i stor s , mak e s a p r e c isi o n c u r r en t s o urce (f igur e 42). the o p a m p b u f f ers t h e r e fer e n c e t e r m i n al to ma in t a in go o d cmr . th e output vo lt age , v x , o f th e ad62 0 a p p e a r s acr o s s r1, which co n v er ts i t t o a c u r r en t. this c u r r en t, les s o n l y t h e in p u t b i as c u r r e n t of t h e op am p , t h e n f l o w s out to t h e l o a d . ad620 r g ?v s v in + v in ? loa d r1 i l v x i = l r1 = in+ [(v ) ? (v )] g in? r1 6 5 + v ? x 4 2 1 8 3 7 +v s ad705 00775-0-044 f i g u re 42. p r ec is io n v o lt ag e - t o - c ur r e n t conve r te r (o pe r a t e s on 1. 8 ma, 3 v ) gain selec t io n the ad620 s gain is r e sist o r -p rog r a m m e d b y r g , o r m o r e p r e c is ely , b y w h a t e v er im p e dance a p p e a r s b e twe e n pin s 1 and 8. the ad620 is desig n e d t o o f f e r acc u ra t e gain s u s in g 0.1% t o 1% r e sis t o r s. t a b l e 4 s h o w s r e q u ir e d val u es o f r g fo r va r i o u s ga in s. n o t e t h a t f o r g = 1, th e r g pi ns are u n c o n n e c te d ( r g = ). f o r an y ar bi t r ar y g a i n , r g c a n be calcul a t ed b y u s i n g th e f o rm ula : 1 4 . 49 ? ? = t o minimize gain er r o r , a v o i d hig h p a rasi tic r e s i s t an ce in s e r i es wi t h r g ; to min i mi ze ga i n dr if t, r g shou l d ha v e a l o w tc l e s s th a n 10 p p m / c f o r th e be st p e rf o r m a n c e . tab l e 4. required v a lues of gain resistors 1% std t a ble value o f r g (?) calculate d gain 0.1% std table value o f r g (? ) calculate d gain 49.9 k 1.990 49.3 k 2.002 12.4 k 4.984 12.4 k 4.984 5.49 k 9.998 5.49 k 9.998 2.61 k 19.93 2.61 k 19.93 1.00 k 50.40 1.01 k 49.91 499 100.0 499 100.0 249 199.4 249 199.4 100 495.0 98.8 501.0 49.9 991.0 49.3 1,003.0 inpu t a n d outpu t o f fset volta g e the lo w er r o rs o f th e ad620 a r e a t tr ib u t e d t o tw o s o ur ces, in p u t an d o u t p ut er r o rs. th e o u t p u t er r o r is div i de d b y g wh e n r e f e rr ed t o th e in p u t. i n p r a c ti ce , t h e in p u t e r r o r s d o m i na t e a t hig h gain s, and t h e ou t p u t er r o rs do mina t e a t lo w ga in s. th e tot a l v os f o r a g i v e n ga in is calc u l a t e d as t o t a l e r r o r r t i = i n p u t er r o r + (o u t p u t er r o r/g) t o t a l e r r o r r t o = (i n p u t er r o r g) + o u tp u t e r r o r reference terminal t h e re f e re nc e te r m i n a l p o te n t i a l d e f i ne s t h e z e ro output vo lt age a nd is es p e c i al l y us ef u l w h e n t h e lo ad do es n o t s h a r e a p r e c is e gr o u n d wi th th e r e s t o f th e sys t em . i t p r o v i d e s a d i r e ct m e a n s o f in je c t in g a p r e c i s e o f fs et t o t h e o u t p ut, wi t h an al lo wa b l e ran g e of 2 v wit h i n t h e su p p ly vol t age s . p a r a s i t i c re s i st anc e s h ou l d b e k e p t to a min i m u m fo r o p t i m u m cmr . inpu t pro t ectio n the ad620 f e a t ur es 400 ? o f s e r i es thin f i l m r e sis t a n c e a t i t s in p u ts an d wi l l s a fely wi t h st and in p u t o v erlo ads o f u p t o 15 v o r 60 ma f o r sev e ral h o ur s. this is tr ue f o r all ga in s an d p o w e r o n a nd o f f, w h ich is p a r t ic u l a r ly im p o r t a n t si n c e t h e sig n a l so ur ce an d am plif ier ma y b e p o w e r e d sep a ra t e ly . f o r lo n g er t i m e p e r i o d s, t h e c u r r en t sh o u l d n o t exce e d 6 ma (i in v in /400 ?). f o r in p u t o v erlo ads beyon d t h e su p p lies, cla m pin g t h e i n p u ts t o t h e su p p lies (usin g a lo w le aka g e dio d e su ch a s an f d 3 3 3 ) w i l l re d u c e t h e re qu i r e d re s i st a n c e , y i el d i n g lo w e r n o is e . rf interference al l inst r u m e n t a t io n a m pl if iers r e c t if y sma l l o u t o f b a nd sig n a l s. the di st ur b a nc e ma y a p p e a r as a sma l l dc vol t age o f fs et. h i g h f r e q uen c y sig n als ca n be f i l t er e d wi t h a lo w p a ss r - c n e tw o r k place d a t t h e in p u t o f t h e inst r u m e n t a t io n am plif ier . f i gur e 4 3 de m o n s t r a t es such a co nf igur a t io n. t h e f i l t er l i mi ts t h e i n p u t sig n al acco r d ing t o th e f o l l o w in g r e l a tio n s h i p : ) 2 ( 2 1 c d diff c c r filterfreq + = = 2 1 wh e r e c d ?10c c. c d a f fe c t s t h e di f f er en ce sig n al . c c a f fe c t s t h e co mm on- m o d e sig n al . a n y misma t ch in r c c wil l deg r ade the ad620 s cmrr . t o a v o i d ina d ver t en t l y r e d u cin g cm r r -b andwi d t h p e r f o r ma n c e , mak e s u r e tha t c c is a t leas t on e ma g n i t u d e smal ler tha n c d . th e ef fe c t o f misma t ch e d c c s is r e d u ced wi th a la rg er c d :c c ra tio .
ad620 rev. g | page 17 of 20 499 ? ad620 + ? v out r r c c c d c c +in ?in ref ? 15v 0.1 f1 f 0 +15v 0.1 f1 f 0 00775-0-045 f i gure 4 3 . cir c ui t to a t t e nu at e rf int e r f er enc e common-m o de rejection i n st r u m e n t a t ion a m pl if iers, su ch as t h e a d 62 0, o f fer hig h cmr , w h ich is a meas ur e o f t h e c h a n g e in o u t p u t v o l t a g e w h en b o t h i n put s are ch ange d b y e q u a l amou n t s . t h e s e sp e c i f i c a t i o ns are u s u a l l y g i ve n for a f u l l - r ange i n put volt age ch ange a n d a sp e c if ie d s o ur ce im b a lan c e . f o r opt i m a l c m r , t h e re f e re n c e te r m i n a l s h o u l d b e t i e d to a lo w i m p e dan c e p o in t, an d dif f er en ces i n c a p a ci t a n c e an d r e sis t a n ce sh o u ld b e k e p t t o a minim u m b e tw e e n t h e tw o in p u ts. i n man y a p plic a t io n s , sh ie lde d c a b l es a r e us e d t o minimize n o is e; f o r bes t cmr o v er f r eq uen c y , th e s h ie ld shou l d b e prop e r ly d r ive n . fi g u re 4 4 and f i g u r e 4 5 s h o w a c t i ve da t a g u a r ds t h a t a r e co nf igur e d t o im p r o v e ac c o mm on- m o d e re j e c t i o ns b y b o o t s t r a p pi ng t h e c a p a c i t a nc e s of i n put c a bl e shi e lds, t h us mi nimi zi n g t h e ca p a ci t a n c e mism a t ch b e twe e n t h e in p u ts. re f e re nce v ou t ad62 0 100 ? 100 ? ? input + input ad648 r g ?v s +v s ?v s 00775- 0- 046 f i g u re 44. d i f f e r e nt ia l sh ie ld d r iver 10 0 ? ? input + input reference v out ad620 ?v s +v s 2 r g 2 r g ad548 00775- 0- 047 f i g u re 45. co m m o n -m ode s h i e ld d r iv er grounding since t h e ad62 0 o u t p u t volt a g e is de velo p e d w i t h r e sp e c t to t h e p o te n t i a l on t h e re f e re nc e te r m i n a l , it c a n s o lve m a n y g r o u n d in g p r oblem s b y si m p ly t y in g t h e ref p i n t o t h e a ppropr i a t e l o c a l g r ou n d . t o is ola t e l o w le v e l a n alog sig n a l s f r o m a n o isy dig i tal en vir o nm e n t, ma n y da t a - a cq uis i t i o n com p on e n ts ha v e s e p a ra te a n a l o g a nd d i g i t a l g r o u n d pin s ( f igur e 46). i t wo u l d b e co n v enien t t o us e a sin g le g r o u nd li n e ; h o w e v e r , c u r r en t t h rou g h g r ou nd w i re s a n d p c r u ns of t h e c i rc u i t c a rd c a n c a u s e h u nd re d s of m i l l ivo l t s of e r ror . t h e r e f ore, s e p a r a te g r ou n d r e t u r n s sh o u l d be p r o v ide d t o minimize the c u r r en t f l o w f r o m t h e s e n s i t i v e p o i n ts t o t h e sys t e m g r o u nd . th e s e g r o u n d r e t u r n s m u s t be tie d t o gether a t s o me p o in t, usual l y best a t t h e ad c p a ck age sh ow n i n fi g u re 4 6 . digital p.s. +5v c analog p.s. +15v c ? 15v ad574a digital data output + 1 f ad620 0.1 f ad585 s/h adc 0.1 f 1 f 1 f 00775- 0- 048 f i gure 46. bas i c g r ounding p r ac tic e
ad620 rev. g | page 18 of 20 ground returns for input bias currents i n p u t b i as c u r r e n ts a r e t h os e c u r r en ts n e ces s a r y t o b i as t h e i n put t r ans i stor s of an am pl i f i e r . t h e r e m u st b e a d i re c t re t u r n p a t h fo r t h es e c u r r en ts. th er efo r e , w h e n am pli f yin g f lo a t in g in p u t s o ur ces, suc h as tra n sfo r m e rs o r ac-co u p l e d s o ur ces, t h er e m u s t be a dc p a th f r o m eac h in p u t t o g r o u nd , as s h o w n in f i gur e 47, f i gure 48, a nd f i gur e 49. ref e r t o a de s i gn er s g u i d e to i n st r u me n t a t i o n a m plif ie rs (f r e e f r o m analog de vices) f o r m o r e info r m a t i o n r e ga r d ing in -a m p a p plic a t ion s . v ou t ad620 ? input r g to power supply ground reference + input +v s ?v s loa d 00775- 0- 049 f i gure 47. ground r e turns for bi as cu rr ents wi th t r a n sformer - c o upled inp u ts v ou t ? input + input r g loa d to power supply ground reference +v s ?v s ad620 00775-0-050 f i gure 48. ground r e turns for bi as c u rr ents wi th thermoc o uple inputs 100 k ? v ou t ad620 ? input + input r g load to power supply ground reference 100k ? ?v s +v s 00775- 0- 051 f i gure 4 9 . gro u nd returns fo r bia s c u rr ents wi th a c - c o u pl ed inp u ts
ad620 rev. g | page 19 of 20 outline dimensions compliant to jedec standards ms-001-ba 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) seating plane 0.015 (0.38) min 0.210 (5.33) max pin 1 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 8 1 4 5 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.100 (2.54) bsc 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 0.060 (1.52) max 0.430 (10.92) max 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) gauge plane 0.005 (0.13) min controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. corner leads may be configured as whole or half leads. f i g u re 50. 8-l e ad p l as t i c d u a l in-l ine p a ckag e [p dip ] narro w b o dy (n- 8 ). di me nsio ns sho w n i n i n che s a n d ( m il lim e t e r s) 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 1 4 85 0.310 (7.87) 0.220 (5.59) pin 1 0.005 (0.13) min 0.055 (1.40) max 0.100 (2.54) bsc 15 0 0.320 (8.13) 0.290 (7.37) 0.015 (0.38) 0.008 (0.20) seating plane 0.200 (5.08) max 0.405 (10.29) max 0.150 (3.81) min 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.070 (1.78) 0.030 (0.76) 0.060 (1.52) 0.015 (0.38) f i gure 51. 8-l e ad cer a m i c d u a l in-l in e p a ckage [ce r di p ] (q -8) di me nsio ns sho w n i n i n che s a n d ( m il lim e t e r s) 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 . 1 9 68) 4. 80 ( 0 . 1 8 90) 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) coplanarity 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 52. 8-l e ad s t anda r d s m a l l o u t l ine p a ckag e [soic ] narro w b o dy (r -8) di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s)
ad620 rev. g | page 20 of 20 ordering guide model temperature r a nge package option 1 ad620an ?40c to +85c n-8 AD620ANZ 2 ?40c to +85c n-8 ad620bn ?40c to +85c n-8 ad620bnz 2 ?40c to +85c n-8 ad620ar ?40c to +85c r-8 ad620arz 2 ?40c to +85c r-8 ad620ar-re el ?40c to +85c 13" ree l ad620arz-reel 2 ?40c to +85c 13" ree l ad620ar-re el7 ?40c to +85c 7" ree l ad620arz-reel 7 2 ?40c to +85c 7" ree l ad620br ?40c to +85c r-8 ad620brz 2 ?40c to +85c r-8 ad620br-reel ?40c to +85c 13" ree l ad620brz-rl 2 ?40c to +85c 13" ree l ad620br-reel7 ?40c to +85c 7" ree l ad620brz-r7 2 ?40c to +85c 7" ree l ad620achips ?40c to +85c die form ad620sq/883b ?55c to +125c q-8 1 n = pl as tic dip ; q = ce rdip ; r = s o ic. 2 z = pb-free part. ? 2004 analo g d e vices, inc. all rights reser v ed. tra d emarks and r e gistered trad e m arks are t h e pr op e r ty o f th eir r e spectiv e o w n e rs. c00775C0 C 12/04(g)

▲Up To Search▲

Price & Availability of AD620ANZ

	To Download AD620ANZ Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .