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single-supply 42 v system difference amplifier prelim inary technical data ad8206 rev. pr a 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 ideal for curren t shunt applica t ions high common- mode voltage r a nge ?2 v to +65 v o p erating ?5 v to +68 v s u rvi v al gain = 20 wide operatin g temperature range die: ? 40 c to + 150c 8-lea d soic: ? 4 0 c to + 125 c adjustable o ffs et avail a ble in so ic and d i e form ex cellent a c a n d dc performa nce 15 v/c offset drift 30 ppm/c gai n drift 80 db cmrr dc to 20 kh z applic a t io ns high-side c u rre nt sensing in: motor controls transmission controls diesel injection controls engine management suspension controls vehicle dy namic controls dc-to - dc co nve r ters func ti on a l bl ock di a g r a m 04953-001 ad8206 8 1 4 2 3 7 5 6 +in ?in nc nc = no connect gnd v+ out v ref 1 v ref 2 fi g u r e 1 . gener a l description the ad8206 is a sin g le-s u p p l y dif f er en ce am p l if ier f o r a m p l if y- in g smal l dif f er en t i al v o l t a g es i n t h e p r es ence o f la rg e co mm on- m o de v o l t a g es. the o p era t in g i n p u t comm o n - m o d e v o l t a g e ra n g e ext e n d s f r o m ?2 v t o +65 v . th e typ i c a l sin g le -s u p pl y vol t age i s 5 v . the ad8206 is o f f e r e d in die and p a c k a g ed f o r m . th e op era t ing t e m p era t ur e ra ng e f o r th e die is 25c hig h er (u p t o 150c) tha n th e p a cka g e d p a r t t o ena b le t h e us er t o a p p l y the ad8206 in hig h t e m p era t u r e a p plic a t io n s . e x ce l l en t dc p e r f o r ma n c e o v er tem p er a t ur e k e e p s er r o rs in t h e m e a s ur e m en t lo o p t o a mini m u m. of fs et dr if t i s typ i c a l l y less t h a n 15 v /c, a nd ga in dr if t is ty p i ca l l y b e lo w 30 p p m / c. the o u t p u t o f fs et can b e ad j u sted f r o m 0.05 v t o 4.8 v wi t h a 5 v su p p ly b y u s ing t h e v ref 1 and v ref 2 p i n s . w i t h v ref 1 a t - t a ch e d to t h e v + p i n, and v ref 2 a t ta c h e d t o th e g n d p i n , th e o u t p u t is s e t a t half s c al e . a t t a chin g bo t h p i ns to gnd c a us es t h e out p ut to b e u n i p ol ar , st ar t i ng n e ar g r ou n d . a t t a ch i n g b o t h p i n s t o v+ c a us es th e ou t p u t t o be uni p ola r s t a r tin g n e a r v+. o t h e r o f fs ets can b e ob t a i n e d b y a p pl yin g an ex t e r n al v o l t a g e t o th e v ref 1 a nd v ref 2 p i n s .
ad8206 preliminary technical data rev. pra | page 2 of 12 table of contents specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 pin configuration and function descriptions ............................. 5 typical performance characteristics ............................................. 6 theory of operation ........................................................................ 8 output offset adjustment ............................................................... 9 unidirectional operation ............................................................ 9 ground referenced output ........................................................ 9 v+ referenced output ................................................................. 9 bidirectional operation ................................................................9 external reference output ........................................................ 10 splitting the supply .................................................................... 10 splitting an external reference ................................................ 10 applications ..................................................................................... 11 high-side current sense with a low-side switch ................. 11 high-side current sense with a high-side switch ............... 11 outline dimensions ....................................................................... 12 ordering guide .......................................................................... 12 revision history 6/04revision 0: initial version
preliminary technical data ad8206 rev. pra | page 3 of 12 specifications t a = operating temperature range, v s = 5 v, unless otherwise noted. table 1. ad8206 soic ad8206 die parameter conditions min typ max min typ max unit gain initial 20 20 v/v accuracy v o 0.1 v dc, 25c 1 1 % accuracy over temperature specified temperature range 1.2 1.3 % gain vs. temperature 30 30 ppm/c voltage offset offset voltage (rti) 25c 2 2.5 mv over temperature (rti) sp ecified temperature range 4.5 6 mv offset drift 15 15 v/c input input impedance differential 400 400 k? common mode 200 200 k? input voltage range common mode, continuous ?2 65 ?2 65 v differential 1 250 250 mv common-mode rejection 25c, f = dc to 20 khz 2 78 86 78 86 db operating temperature range, f = dc to 20 khz 2 76 80 76 80 db output output voltage range r l = 25 k? 0.05 4.8 0.05 4.8 v output resistance 200 200 ? dynamic response small signal ?3 db bandwidth 50 50 khz slew rate 0.5 0.5 v/s noise 0.1 hz to 10 hz, rti 20 20 v p-p spectral density, 1 khz, rti 0.5 0.5 v/hz offset adjustment ratiometric accuracy 3 divider to supplies 0.497 0.503 0.497 0.503 v/v accuracy, rto voltage applied to v ref 1 and v ref 2 in parallel 2 2 mv/v output offset adjustment range v s = 5 v 0.05 4.8 0.05 4.8 v vref divider resistor values 24 32 40 24 32 40 k? power supply operating range 4.5 5.5 4.5 5.5 v quiescent current over temperature v o = 0.1 v dc 2 2 ma power supply rejection ratio 70 70 db temperature range for specified performance operating temp erature range ?40 +125 ?40c +150 c 1 input voltage range = 125 mv with half-scale offset. 2 source imbalance < 2 ?. 3 the offset adjustment is ratiometric to the power supply when v ref 1 and v ref 2 are used as a divider between the supplies.
ad8206 prelim inary technical data r e v. pr a | pa g e 4 of 12 absolute maximum ra tings table 2. p a r a m e t e r r a t i n g supply voltage 12.5 v continuous input volt age ?5 v to +68 v reverse supply voltage 0.3 v operating tem p erature range ?40c to +125c storage temperature ?65 to +150c output short-ci rcuit du r a t i o n i n d e f i n i t e 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 a n d 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 o t h e r con d i t io n s ab o v e t h o s e i ndic a t e d i n t h e op era t io nal 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 c a ution 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 with out detection. although th is product features pro- prietary esd protection circuitry, permanent damage ma y occur on devices sub j ected to high energy electro- static discharge s . therefore, pro p er esd precautions are recommended to avoid performance degradation or loss of functionality.
prelim inary technical data ad8206 r e v. pr a | pa g e 5 of 12 pin conf igura t ion and fu nction descriptions 04953-002 f i gur e 2 . me t a ll iz a t i o n dia g r a m nc = no connect ad8206 top view (not to scale) ?in 1 gnd 2 v ref 2 3 nc 4 +in v ref 1 v+ out 8 7 6 5 04953-003 f i gure 3. pin config ur ation ta ble 3. pi n f u nct i on d e s c ri pt i o ns pin no. neonic 1 ? i n ? 2 0 6 5 0 8 2 g n d ? 4 4 7 5 7 3 v ref 2 ? 4 3 2 ? 4 5 7 4 n c n / a n / a 5 o u t 4 4 4 ? 4 7 2 6 v + 4 4 4 ? 2 0 3 7 v ref 1 4 5 6 4 3 4 8 + i n 2 0 3 5 0 9 die size is 1170 m b y 1280 m. die t h ick n es s is 13 mi l . mini m u m p a ssiva t ion o p en in g (mini m u m b o nd p a d si ze) is 92 m 92 m. p a s s i v a t ion typ e is 8k a usg (oxide) + 10k a oxyni t r i de . b o nd p a d m e tal co m p osi t ion is 98.5% al , 1% si, a nd 0.5% c u . b a cksi de p o t e n t ia l is v+.
ad8206 prelim inary technical data r e v. pr a | pa g e 6 of 12 typical perf orm ance cha r acte ristics f i g u re 4. t y pic a l o f f s et d r if t fi g u r e 5 . c m r v s . fr e q u e n c y f i g u re 6. g a in d r if t f i gure 7 . t y pi c a l s m al l si gn a l ba ndwi dth ( v ou t = 2 00 m v p -p) f i g u re 8. r i s e /f a ll tim e f i g u re 9. d i f f e r e nt i a l o v er lo ad r e c o ve r y ( f all i ng )
prelim inary technical data ad8206 r e v. pr a | pa g e 7 of 12 f i g u re 10. d i f f e r e nt ia l o v e r l oad r eco ver y ( r is ing ) f i gure 1 1 . s e ttli n g t i m e f i g u re 12. co m m o n -m ode r e s p ons e
ad8206 prelim inary technical data r e v. pr a | pa g e 8 of 12 theor y of opera tion the ad 820 6 i s a s i n g l e -su ppl y dif f er e n c e am pl i f ier t h a t us es a u n i q u e a r c h i t ec t u r e t o a ccu ra t e l y a m p l i f y sm all di f f e r en ti al cu r - r e n t sh u n t v o l t ages i n t h e p r es e n ce o f r a p i dl y cha n g i n g comm on- m o d e v o l t a g es. i t is o f f e r e d in bo th pac k a g e d a n d di e f o r m . i n typ i c a l a p p l ic a t io n s , t h e ad8 206 is us ed t o m e as ur e c u r r en t b y a m pl if y i n g t h e vol t a g e acr o ss a c u r r en t sh u n t place d acr o ss th e i n p u t s . the ga in o f the ad8206 is 20 v/v , wi th an acc u rac y o f 1.2%. this acc u rac y is gua r a n t e e d o v e r t h e o p era t i n g tem p er a t ur e ra n g e o f ?40c t o +125c. th e die tem p era t ur e ra n g e is ?40c t o +150c wi t h a gua r a n t e e d ga in acc u rac y o f 1.3%. the in p u t o f fs et is les s tha n 2 mv r e f e r r ed t o the in p u t a t 25c, a nd 4.5 mv maxim u m r e fer r e d t o t h e in p u t o v er t h e f u l l o p era t - in g t e m p er a t ur e ra n g e fo r t h e p a cka g e d p a r t . th e die in pu t o f f- s e t is les s t h an 6 mv r e fer r e d t o t h e in p u t o v er t h e die op era t i n g t e m p era t ur e ra ng e . th e ad8206 o p era t es wi th a sin g le s u p p l y f r o m 4.5 v t o 10 v (a b - s o l u t e maxim u m = 12. 5 v). th e s u p p l y curr en t is l e s s th a n 2 ma. h i g h acc u rac y tr immin g o f the in t e r n al r e sis t o r s al lo ws t h e ad8206 t o ha ve a co mm o n -m o d e r e jec t ion ra tio bet t er than 78 db f r o m dc to 20 kh z. th e c o mm on-m o d e rejec t ion ra tio o v er t h e op era t i n g t e m p era t ur e is 76 db fo r b o t h t h e die and pa c k a g ed pa r t . the o u t p u t o f fs et can b e ad j u sted f r o m 0.05 v t o 4.8 v (v+ = 5 v) f o r un i p o l ar a n d b i p o la r o p era t io n . the ad8206 con s is ts o f tw o am p l if iers (a1 a n d a2), a r e sis t o r n e tw o r k, sma l l vol t a g e r e fer e n c e, a nd a b i as circ ui t ( n o t sh o w n ) , s e e f i gur e 13. the s e t o f in pu t a t ten u a t o r s p r e c e d i n g a1 co n s i s t o f r a , r b , a n d r c , w h ich r e d u c e t h e co mm o n - m o d e v o l t a g e t o ma t c h t h e i n p u t v o l t a g e ra n g e o f a1. th e tw o a t ten u a t o r s fo r m a b a lan c e d b r i d ge n e tw o r k. w h en t h e b r idge is b a l a n c e d , t h e dif f er en t i al v o l t a g e cr ea t e d b y a comm on-m o d e vol t a g e is 0 v a t t h e in p u ts o f a1. the i n p u t a t t e n u a t ion ra t i o is 1 / 16.7. th e com b i n e d s e r i es r e sis - ta n c e o f r a , r b , a nd r c is a p p r o x ima t e l y 200 k? 20%. by a t te n u a t i n g t h e vol t a g es a t pi n 1 an d pi n 8, t h e a1 a m pl if ier in p u ts a r e h e l d wi t h i n t h e p o w e r s u p p l y ra n g e , e v en if p i n 1 and p i n 8 exceed t h e s u p p l y o r fal l b e lo w co mm on (g r o un d). a r e f - er en ce v o l t a g e of 250 mv b i as es th e a t t e n u a t o r a b o v e g r o u nd . this al lo ws t h e a m plif ier t o o p e r a t e i n t h e p r es e n ce o f n e g a t i v e co mm on-m o d e v o l t a g es. t h e i n put n e t w or k a l s o att e n u at e s n o r m a l ( d i f f e re n t i a l ) m o d e v o l t a g es. a1 am plif ies t h e a t t e n u a t e d sig n al b y 26. the in p u t a nd o u t p u t o f t h is a m plif ier a r e dif f er en t i al t o maximi ze t h e ac co mm on-m o d e r e jec t io n. a2 co n v er ts t h e dif f er en t i al v o l t a g e f r o m a1 i n to a sin g le- e n d e d sig n a l an d p r o v i d es f u r t h e r a m plif ica t ion. the ga in o f t h is s e c- o n d s t a g e is 12. 86. t h e re f e re nc e i n put s , v ref 1 a nd v ref 2, a r e ti ed th r o ugh r e si s t o r s to t h e p o s i t i ve i n put of a 2 , w h i c h a l l o w s t h e output of f s e t to b e ad j u s t e d an y w her e in t h e ou t p ut o p era t i n g ra n g e . th e ga i n is 1 v/v f r o m t h e r e fer e n c e p i n s to t h e o u t p ut w h en t h e r e fer e n c e p i n s a r e us e d in p a ra l l e l . t h e gain is 0.5 v / v w h e n t h e y a r e us e d to di v i d e t h e s u pply . t h e r a t i o s of r e s i stor s r a , r b , r c , r d , a n d r f are t r i m me d to a hig h l e v e l o f p r e c isio n t o a l lo w t h e co m m on- m o d e r e j e c t io n ra t i o t o exce e d 80 db . t h is is a c co m p lish e d b y las e r t r im min g t h e re s i stor r a t i o ma tch i ng to b e t t e r t h an 0 . 0 1 %. the t o t a l ga in of 50 is made u p o f t h e i n p u t a t t e n u a t io n o f 1/16.7 m u l t i p lie d b y t h e f i rst s t ag e ga in o f 26 and t h e s e cond s t a g e gain o f 12. 86. the o u t p u t sta g e is c l as s a wi t h a pnp p u l l -u p tra n sis t o r a n d a 300 a c u r r en t sink p u l l -do w n. 04953-013 ad8206 +in ? in 250mv gnd a1 a2 r a r a r b r b r f r f r d r d r e r f r c r c v out r ref r ref v ref 1 v ref 2 f i g u re 13. si mpl i f i e d s c h e m a t i c
prelim inary technical data ad8206 r e v. pr a | pa g e 9 of 12 output offset adjustment the o u t p u t o f t h e ad8206 can be ad j u s t e d f o r unidir ec tio n al or b i d i r e c t io na l op era t io n. unidirec ti onal o p er a t io n u n idir ec tio n al o p era t ion al lo ws th e ad8206 to m e as ur e c u r - re n t s t h rou g h a re s i st ive sh u n t i n on e d i re c t i o n . t h e b a s i c m o des fo r unidi r e c t i o n a l o p er a t io n a r e g r o u nd r e fer e n c e d o u t p ut m o de and v+ r e fer e n c e d o u tp u t m o de. i n t h e c a s e of u n i d i r e c t i on a l op e r a t i o n , t h e output c o u l d b e s e t a t t h e n e ga ti ve ra il (n ea r gr o u n d ) o r a t th e p o si tiv e ra il (n ea r v+) w h e n t h e dif f er en t i al in pu t is 0 v . th e o u t p u t mo v e s t o t h e o p p o si t e ra i l w h en a co r r e c t p o l a r i ty dif f er en t i a l in p u t v o l t a g e is a p p l ie d . i n this cas e , f u l l s c ale is a p p r o x ima t e l y 250 mv . th e r e q u ir e d p o l a r i t y o f t h e dif f er en t i al in p u t dep e nds o n t h e o u t p ut v o l t a g e s e t t ing. i f t h e o u t p u t is s e t a t t h e p o si t i ve ra i l , t h e i n p u t p o la r i ty n eeds to be n e ga ti v e t o m o ve t h e o u t p u t do wn. i f t h e o u t p u t is s e t a t g r o u n d , the p o l a r i ty is p o si ti ve t o m o ve t h e output up . ground referenced output w h en usin g th e ad8206 in this m o de , bo th r e f e r e n c e in p u ts a r e t i e d t o gr o u n d , w h ich ca us es t h e o u t p u t t o si t a t th e n e ga t i v e ra il w h en t h er e a r e zer o dif f e r en t i al v o l t s a t t h e in p u t (s e e f i gur e 14). 04953-014 ad8206 +in ?in nc nc = no connect gnd v+ out v ref 1 v ref 2 f i g u re 14. ground r e f e r e n c ed o u t p ut table 4. v+ = 5 v v in (ref erred to ?in) v o 0 v 0.05 v 250 mv 4.8 v v+ refe renced ou tpu t this m o de is s e t w h en b o t h r e fer e n c e pin s a r e t i e d t o t h e p o si - ti v e s u p p l y . i t is typ i c a l l y us ed w h en t h e dia g n o stic s c h e m e r e q u ir es dete c t i o n o f t h e am plif ier a nd t h e wir i n g b e fo r e p o w e r is a p plie d t o t h e lo ad (s e e f i gure 15). 04953-015 ad8206 +in ?in nc nc = no connect gnd v+ out v ref 1 v ref 2 f i gure 15. v+ r e fe renc ed o u tput table 5. v+ = 5 v v in (ref erred to ?in) v o 0 v 4.8 v 250 mv 0.05 v bidirec t ional oper a t ion b i dir e c t io nal o p era t io n al lo ws t h e ad8206 t o m e as ur e c u r r en ts t h rou g h a re s i st ive s h u n t i n t w o d i re c t i o ns . i n t h is cas e , t h e o u t p ut is s e t an y w h e r e w i t h i n t h e o u t p ut ra n g e. t y p i cal l y , i t is s e t a t half -s c a le f o r e q ual ra n g e in bo t h dir e c t io n s . i n so m e c a se s , h o w e v e r , i t i s set a t a v o l t a g e o t h e r th a n h a l f -sc a le w h en t h e b i dir e c t io nal c u r r en t i s n o n s y m m e t r ic al . table 6. v+ = 5 v, v o = 2 . 5 wit h v in = 0 v v in (ref erred to ?in) v o +100 mv 4.5 v ?100 mv 0.5 v a d j u s t in g t h e ou t p u t is acco m p lis h e d b y a p p l y i n g v o l t a g e(s) t o t h e re f e re nc e i n put s . v ref 1 a n d v ref 2 are t i e d to i n te r n a l re s i stors t h a t c o nne c t to a n in t e r n al o f fs et no de . ther e is n o o p era t io nal dif f er en ce b e tw e e n th e p i n s .
ad8206 prelim inary technical data r e v. pr a | pa g e 10 o f 12 external re ference ou tpu t t y in g bo t h p i ns t o g e th er and t o a r e f e r e n c e p r o d uces a n ou t p u t a t t h e r e fer e n c e v o l t a g e w h e n t h er e is n o dif f er en t i al i n p u t (s e e f i g u re 1 6 ) . t h e output mo ve s d o w n f r om t h e re f e re nc e vo lt ag e w h en t h e i n p u t is n e g a t i v e re l a t i v e t o t h e ?in pi n an d u p w h en th e i n p u t i s posi ti v e r e la ti v e t o t h e ?in p i n . 04953-016 ad8206 +in ?in nc nc = no connect gnd v+ out v ref 1 v ref 2 2.5v voltage reference f i g u re 16. e x ter n a l r e f e r e n c e o u t p ut split t ing th e suppl y by tyin g on e r e fer e n c e pin t o v + a n d t h e o t h e r t o t h e g r o u nd p i n, t h e o u t p u t i s s e t a t half o f t h e su p p l y w h en t h er e is n o dif f er en t i al i n p u t (s e e f i gur e 17) . the b e n e f i t is t h a t n o ext e r n al re f e re nc e i s re q u i r e d to of f s e t t h e output f o r bi d i re c t i o n a l curr en t m e as ur em en t . th i s cr ea t e s a m i dscale o f fset tha t is r a ti o m e t ri c t o th e s u p p l y , wh i c h m e a n s th a t i f th e s u p p l y i n c r ea se s o r dec r ease s, th e o u t p u t r e m a in s a t hal f th e s u p p l y . f o r e x a m p l e , if t h e su p p l y is 5 . 0 v , t h e o u t p u t is a t half s c al e o r 2. 5 v . i f t h e s u p p ly in creas e s b y 10 % ( t o 5. 5 v), t h e o u t p u t go es to 2 . 75 v . 04953-017 ad8206 +in ?i n nc nc = no connect gnd v+ out v ref 1 v ref 2 f i gure 17. split sup p ly split t ing an extern al reference i n t h i s cas e , a n ex ter n a l r e fer e nce is divi de d b y 2 wi t h an acc u rac y o f a p p r o x ima t e l y 0.5% b y co nn ec tin g o n e v ref pi n to g r ou nd a n d t h e ot he r v ref pi n t o t h e re f e re nc e ( s e e f i g u re 1 8 ) . 04953-018 ad8206 +in ?i n nc nc = no connect gnd v+ out v ref 1 v ref 2 5v voltage reference f i gure 18. spl i t e x te rna l r e fe r e n c e
prelim inary technical data ad8206 r e v. pr a | pa g e 11 o f 12 appli c a t ions a typ i cal a p p l ic a t io n f o r the ad8206 is hig h -s ide m e as ur emen t o f a c u r r en t thro ug h a s o len o id f o r pwm co n t r o l o f th e s o le- n o id o p e n i n g. t y p i cal a p p l i c a t io n s in c l ud e h y dra u li c tra n sm i s - sio n co n t r o l a nd die s el in j e c t ion co n t r o l. t w o typ i c a l cir c ui t co nf igura t io n s a r e us ed f o r this typ e o f ap p l i c at i o n . high-si d e c u rrent sense with a l o w - side swit ch i n t h i s c a s e , t h e p w m c o n t ro l s w itch i s g r ou n d re f e re nc e d . a n ind u c t iv e lo ad ( s olen o i d) is t i e d t o a p o w e r supply . a r e sist i v e s h un t i s p l aced bet w een t h e swi t c h a n d t h e l o a d (see f i gur e 19). an ad v a n t a g e of placin g t h e sh un t o n t h e hi g h side is t h a t t h e e n ti r e cu rr e n t , in c l ud i n g th e r e -c i r cul a ti o n cu rr e n t , c a n be m e as ur e d si n c e t h e s h u n t r e mai n s in t h e lo o p w h e n t h e s w i t ch is o f f. i n ad di t i on, d i a g n o st ics c a n b e en han c e d b e c a us e sh o r ts to g r o u n d ca n b e dete c t e d w i t h t h e sh u n t on t h e hig h side. i n this cir c ui t c o nf igura t io n, w h en t h e s w i t c h is c l os ed , t h e c o mmon- m o d e vol t age mo ve s dow n to ne ar t h e ne g a t i v e r a i l . w h en t h e s w i t ch is o p e n e d , t h e v o l t a g e r e v e rs al acr o s s t h e ind u c t iv e lo ad c a us es t h e co mmo n - m o d e v o l t a g e t o b e he ld on e dio d e dr o p ab o v e t h e b a t t er y b y t h e cla m p dio d e . 04953-019 +in v ref 1 +v s out ?i n gnd v ref 2 nc inductive load ad8206 clamp diode 42v batter y shunt switch nc = no connect 5v f i g u re 19. l o w-sid e switc h high-side current sense with a high-side swit ch this co nf igura t i o n min i m i ze s t h e p o ssib i l i t y o f un exp e c t e d s o len o id ac tiva t i o n an d exces s i v e co r r osio n (s ee f i gur e 20). i n t h is cas e , b o t h t h e s w i t ch and t h e s h u n t a r e o n t h e hig h side . w h e n t h e sw i t ch i s o f f , th i s r e m o v e s th e ba t t er y f r o m th e load , w h ich p r e v e n ts da ma ge f r o m p o t e n t ia l sh o r ts to g r o u n d , w h i l e s t il l al lo win g t h e r e cir c u l a t in g c u r r en t t o b e m e as ur e d an d p r o - vi ding fo r di a g no st ics. re mo v i ng t h e p o w e r supply f r o m t h e lo ad fo r t h e ma j o r i ty o f t h e t i m e mini mi zes t h e co r r osi v e ef fe c t s t h a t co u l d b e ca us e d b y t h e dif f er en t i al v o l t a g e b e tw e e n t h e lo ad a nd g r o u nd . w h en usi n g a hig h -side s w i t ch, t h e b a t t er y v o l t a g e is co nn e c te d t o t h e lo ad w h e n t h e s w i t ch is clos e d , c a usin g t h e co mm on- mo de volt age to i n c r e a s e to t h e b a tte r y volt age. i n t h i s c a s e , w h en t h e sw i t ch is o p e n e d , t h e v o l t a g e r e v e rs al acr o s s t h e ind u c t iv e lo ad c a us es t h e co mmo n - m o d e v o l t a g e t o b e he ld on e dio d e dr o p b e lo w g r o u nd b y t h e clam p dio d e. 04953-020 +in v ref 1 +v s out ?i n gnd v ref 2 nc inductive load ad8206 clamp diode 42v batter y shunt switch nc = no connect 5v f i gure 2 0 . hi gh-si d e s w i t ch an o t h e r typ i cal a p p l ic a t ion f o r th e ad8206 is as p a r t o f th e co n t r o l lo o p in h-b r idg e m o t o r co n t r o l . i n t h is cas e , t h e ad8206 is p l ac ed in t h e middl e o f th e h-b r idge (s ee f i gur e 21 ) so th a t i t c a n a ccu ra t e l y m e as u r e cu rr e n t in bo th di r e cti o n s b y usin g t h e sh un t a v a i la b l e a t t h e m o t o r . this is a b e t t er s o l u t i o n t h an a g r ou n d re f e re nc e d op a m p b e c a u s e g r ou n d i s not t y pi - ca l l y a st ab le r e fer e n c e v o l t a g e i n t h is ty p e o f a pplica t ion. t h is in s t a b i l i t y in t h e g r o u n d r e fer e n c e ca us es t h e m e as ur e m en ts tha t co u l d b e made wi th a sim p le g r o u n d r e f e r e n c e d o p a m p t o be i n a c cura t e . the ad8206 meas ur es c u r r en t in bo t h dir e c t ion s as t h e h-b r i d ge s w i t ches a nd t h e m o tor cha n ges dir e c t io n. t h e ou tp u t o f th e ad8206 is co nf igur ed in a n ext e r n al r e f e r e n c e b i dir e c - t i o n al m o de , s e e t h e o u t p u t of fs et a d j u s t men t s e c t io n. 04953-021 +in v ref 1 +v s out ?in gnd v ref 2 nc ad8206 shunt 5v 2.5v 5v controller nc = no connect motor f i gure 21. motor control a p pl ic atio n
ad8206 prelim inary technical data r e v. pr a | pa g e 12 o f 12 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. 0 0 ( 0 . 1 968) 4. 8 0 ( 0 . 1 890) 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) di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s) ordering guide models temperature r a nge package descri ption package option ad8206yr ?40c to +125c 8-lead soic r-8 ad8206yr-ree l ?40c to +125c 8-lead soic, 13 tape and reel r-8 ad8206yr-ree l 7 ?40c to +125c 8-lead soic, 7 tape and reel r-8 ad8206ycsurf ?40c to +150c die form ? 2004 a n alo g devic e s, inc. all rig h ts res e rve d . t r ade m arks a n d re g i s - tered trade m arks are the property of their respective owners . pr04953C0C7/04(p r a )

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