300/s single chip yaw rate gyro with signal conditioning ADXRS300 features ? c o mplet e r a t e gyr o sc ope on a single chip ? z-a x is (y a w r a te) r e sponse ? high vibr a t ion r e jec t ion ov er wide fr equenc y ? 2000 g pow e red shock oper a t ion ? s e lf-t e s t on dig i tal c o mmand ? t e mper a t ur e s e nsor output ? p r ecision v o ltage r e f e r e nc e o u tput ? a b solut e r a t e o u tput f o r pr ecision ap plic a t ions ? 5 v single - sup p l y oper a t ion ? ultr a small and light (< 0.15 c c , < 0.5 gr am) applic ation s ? v e hicle chassis r o llov e r sensing ? iner tial meas urement units ? pla t f o rm stabil iza t ion general de scription th e ad xrs300 is a co m p lete a n gu la r ra t e s e n s o r (g yr os co p e ) t h a t us es a n alog de vices s u r f ace-micr o mac hinin g p r oces s t o ma k e a f u nc t i o n a l ly co m p l e te and l o w co st ang u l a r r a te s e ns o r i n te g r a t e d w i th all o f th e r e q u i r ed e l ec tr o n i c s o n o n e c h i p . t h e m a n u f a ct u r i n g te c h niq u e f o r t h i s de vice is t h e s a m e hig h v o l u m e b i mos p r oces s u s e d fo r hig h r e l i ab i l i t y a u to m o t i ve air b ag a ccel e r o me te rs . t h e ou tp u t s i g n a l , r a t e ou t ( 1 b, 2 a ) , i s a v o lt a g e p r op or t i on a l t o a n gu la r ra t e a b o u t t h e ax is n o r m a l t o t h e t o p s u r f ace o f t h e p a c k a g e (s e e f igur e 2). a sin g le exter n a l r e sis t o r ca n b e us e d to lo wer t h e sca l e fact o r . an ext e r nal ca p a ci t o r is use d t o set t h e ba n d wid t h. o t h e r ext e rna l ca p a ci to rs a r e r e q u ir e d f o r o p era t i o n (s e e f igur e 3). a p r e c isio n r e f e r e n c e an d a tem p era t ur e o u t p u t a r e a l s o p r o v ide d f o r co m p en sa t i o n t e c h niq u es. t w o digi t a l se lf-t es t in p u ts e l e c t r om e c h a n i c a l l y e x c i t e t h e s e n s or t o t e s t p r op e r op e r at i o n of b o t h s e n s o r s a n d t h e sig n a l co n d i t io nin g cir c ui ts. th e ad xrs300 is a v a i la b l e in a 7 mm 7 mm 3 mm b g a s u r f ace-m o un t p a c k a g e . function al block di ag ram 5g 4g 3a 5v 2g 1f 7f 6a 7d 7c 7b 1c 4a 5a 7e 6g 1d 2a 1e 3g 1b pdd 12v + ADXRS300 47nf 22nf 100nf 22nf cp2 cp1 pgnd cp4 cp3 cp5 charge pump/reg. temp ptat rateout 2.5v demod rate sensor self test 100nf 100nf cmid agnd avcc st1 st2 coriolis signal channel r sen 1 r sen 2 c out sumj r out 2.5v ref 7k ? 35% 7k ? 35% 180k ? 1% resonator loop ? fi g u r e 1 rev. 0 in fo rmation furn is h e d by an al o g dev i ces is believed to be a ccu rate and r e liable. how e ver, no r e spons i bili ty is assumed by analog devices fo r its use, nor f o r an y i n fri n geme nt s of p a t e nt s or ot her ri g h t s o f th ird parties th at may result fro m its use . specifications subject to chan g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot he rwi s e un der a n y p a t e nt or p a t e nt r i ghts of anal og de vices. trad emarks an d registered tra d ema r ks are the proper ty of th eir respectiv e co mpan ies. 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 ? 2003 analog de vices, i n c. al l r i ght s r e ser v ed .
ADXRS300 table of conte n ts ad xrs300s p e c if ica t io n s ................................................................... 3 a b s o l u te m a xim u m r a t i n g s .................................................................. 4 r a te s e n s i t i v e a x is .............................................................................. 4 th e o r y o f o p era t io n ............................................................................... 5 s u p p ly an d c o mmo n c o n s idera t i o n s .............................................. 5 s e t t in g b a n d wid t h ............................................................................... 5 i n cr e a sin g m e as ur emen t r a n g e ........................................................ 6 u s in g t h e ad xrs300 wi t h a s u p p l y -r a t io m e t r ic ad c ................ 6 n u l l a d j u s t ............................................................................................ 6 s e lf-t es t f u n c t i o n ................................................................................ 6 c o n t in uo us s e lf- t es t ........................................................................... 6 p i n c o nf igura t i o n an d p i n f u nct i o n d e s c r i p t io n s ............................. 7 o u t l in e dimen s i o n s ................................................................................ 8 or der i n g g u id e .................................................................................... 8 revisi on h i s t or y re visio n 0: i n i t ia l v e rsio n rev. 0 | page 2 of 8
ADXRS300 ADXRS300specifications @t a = 25c, v s = 5 v, an gul a r rate = 0/s, ban d w i dth = 80 hz (c o u t = 0.01 f), u n le ss otherwise noted. adxrs 300a bg param e t e r c o n d i t i o n s min 1 t y p max 1 u n i t clockwise rotati on is positive ou t p ut dynamic range 2 full-sca le range over specif icatio ns range 300 /s i n i t i a l @ 2 5 c 4 . 6 5 5 . 4 m v / / s over temperature 3 v s = 4.75 v to 5.2 5 v 4.6 5 5.4 mv//s sensitivi t y nonlinearity best fit straight line 0.1 % of fs initial null 2.3 2.50 2.7 v over temperature 3 v s = 4.75 v to 5.2 5 v 2.3 2.7 v tur n - o n tim e po wer on to ? / s of fina l 35 m s linear acce leration effect any axis 0.2 /s/ g null voltage sensitivit y v cc = 4.75 v to 5. 25 v 1 /s/v noise perform a nce rate noise density @25c 0.1 /s/ hz 3 db band width (user sel e c t abl e ) 4 22 nf as comp c a p (see appli c ati o ns sectio n) 40 hz frequency res p onse sensor resonant frequency 14 kh z st1 r a teo u t r e sponse 5 st1 pin from logic 0 to 1 C150 C270 C450 mv st2 r a teo u t r e sponse 5 st2 p i n from logic 0 to 1 +150 +270 +450 mv logic 1 inpu t vol t age standard h i gh logic level d e finition 3.3 v logic 0 inpu t voltage standard low lo gic level definiti on 1.7 v self-tes t inputs input impeda nce to common 50 k v ou t at 298k 2.50 v max current load on p i n sourc e to comm on 50 a tem p era t ure s e nsor scale fact or proportiona l to a b solute temperature 8.4 mv/k output vo ltage swing i ou t = 100 a 0.25 v s C 0.25 v o u tp ut d r ive c a p a bility capacitive load drive 1000 pf voltage value 2.45 2.5 2.55 v load drive to gr ound source 200 a load regulation 0 < i ou t < 20 0 a 5.0 mv/ma po wer supp ly re jectio n 4.75 v s to 5.25 v s 1 . 0 m v / v 2.5 v reference temperature drift delta from 25c 5.0 mv operating voltag e range 4.75 5.00 5.25 v power s u p p l y quiescent su pp ly current 6.0 8.0 ma tem p era t ure r a nge specified performance grade a temperature tes t ed to max and min specs. C40 +85 c ta b l e 1 1 al l min and max s p ecif ications are guaranteed . ty pical sp ecificat ion s are n o t t e st ed or guaran t eed. 2 dynamic range is t h e maximum f u ll -s c a l e me a s urement range poss ibl e , includ ing output s w in g range, initial off s et, s e ns itivity , off s et d r if t, and s e n s itivity dri f t a t 5 v suppli e s. 3 specif ication ref e rs to the maximum extent of this param e ter as a wors t-cas e val u e at t min or t ma x . 4 freq u en cy a t wh i c h respon se i s 3 db down from dc r e sp on se wi t h sp eci f i e d com p en sa t i on ca pa ci t o r va lue. in t e rn a l po le form i n g r e si stor is 180 k . se e s e tting band wid th s e ctio n. 5 se lf- t e st re spon se va ri es wi t h t e m p er a t ure. r e f e r t o t h e s e lf- te st fun ct i o n s e ct i o n for det a i l s . rev. 0 | page 3 of 8
ADXRS300 rev. 0 page 4 of 8 absolute maximum ratings param e t e r r a t i n g acce leration (an y axis, un powered, 0.5 ms) 2000 g acce leration (an y axis, po wered, 0.5 ms) 2000 g v s C0.3 v to 6.0 v output sh ort-circuit duration (any pi n to com m on) indefininte operating temp erature range C55c to 125c storage temperature C65c to 150c ta b l e 2 s t r e s s es a b o v e t h ose lis t e d un der t h e a b so l u t e m a xim u m r a t i n g s ma y ca use p e r m a n en t da ma g e t o t h e de vice . this is a s t r e s s r a t i n g on l y 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 at t h e s e or a n y o t h e r co n d i t i o n s ab o v e t h os e in di ca te d in t h e o p er a t io na l s e ct io n o f t h is s p e c if ica t i o n is no t im plie d . e x p o s u r e to abs o l u te m a x i m u m r a t i ng cond i t i o ns fo r e x te nd e d p e r i o d s m a y af fe c t de vice r e liab i l i t y . a p plica t io n s r e q u ir in g m o r e tha n 200 c y c l es to mil - s t d-883 m e t h od 1010 c o n d i t io n b (C55 c to 125c) r e q u ir e un d e r f il l o r o t h e r m e a n s t o ac hie v e t h is r e q u ir em en t. dr o p s o n to ha r d s u r f aces ca n ca us e s h oc ks o f g r e a ter t h a n 2000 g g g g rate sensitive axis this is a z-axis ra te-s en sin g de vice t h a t is a l s o ca l l e d a ya w-ra te s e n s in g de vice. i t p r od uces a p o si t i v e g o in g o u t p u t v o l t ag e fo r c l o c k w ise r o t a t i o n a b o u t t h e axis n o r m a l t o t h e pa c k a g e to p , i . e . , c l o c k w ise w h en l o o k ing do wn a t t h e p a c k a g e lid . 2. 5v rate axis ra te ou t r a t e in gn d 4. 7 5 v 0.2 5 v la t e r a l a x i s abcdef g 7 a1 1 longitudinal axis v cc = 5v f i gure 2. r a teout signal in cr ea ses with cl ock w i s e ro ta t i o n
ADXRS300 theory of operation th e ad xrs300 o p era t es o n t h e p r in i ple o a r e s o na to r g y ro t w o p o lysi lio n s e n s in g s t r t r es e a h o n t ain a di t h er r ae w h i h is e l etr o s ta ti a ll y d r i e n t o r e so n a n e t h i s p r od e s th e n e e s s a r y e loi ty e l e en t t o p r od e a c o r i o l is o r e d r i n g a n g la r ra t e a t tw o o t h e o t e r etr e es o e a h r a e o r t h og o n a l t o t h e di t h er o t i o n a r e o a l e i n g er s t h a t a r e p l ae d etw een i e d p i o i nge r s to o r a a p a i t i e pi o st r t r e t h a t s e ns e s c o r i ol i s o t i o n th e r e s l t in g sig n al is e d to a s e r i es o gai n an d d e o d l a ti o n s t a g e s th a t p r od e th e e l et r i al r a t e s i gn al o t p t th e d a l sen so r design r e e ts e t e rna l g o r es and i r a t io n f a r i a t i n g th e se n s o r w i th th e s i gn al o n d i t io n i n g e l etr o n i s p r eser e s sign a l i n t e gr i t y in n o isy en ir o n en ts t h e e l etr o s ta ti r e so n a t o r r e i r e s t o o r o p e r a t i o n s i n e o n ly is typ i a l l y a ai la l e in os t a p plia t io n s a h arg e p p is in l ded o n hi p i a n eter nal to s p p l y is a a i la l e t h e tw o a p a i t o r s o n cpcp a n e o i t t e d a n d t h is s p p l y a n e o nn e te d to cp p in d wi t h a 00 nf de o p ling a p a i to r in pla e o t h e nf at e r t h e de o d la t i o n s t a g e t h e r e is a sin g l e p o l e lo wp a s s i l t e r o ns i s t i ng o an i n te r n a l ? agnd temp st2 st 1 pg nd cp1 cp2 cp4 rateout cp4 pdd cmid sumj 2.5v 6a 5a 4a 3a 2a 1b 1c 1d 1e 1f 7b 7c 7d 7e 7f 6g 5g 4g 3g 2g cp5 cp3 100nf c out = 22nf 22nf avcc 100nf 100nf pgnd 22nf 47nf 5v note that inner rows/columns of pins have been omitted for clarity but should be connected in the application. f i gure 3. e x a m p l e a p plic ati o n c i rcu i t ( t op vie w ) n o t e t h a t inn e r r o ws/c o l umn s o f p i n s ha v e be en o m i t t e d f o r c l a r i t y b u t s h o u ld b e co nn e c te d in t h e a p plica t io n. sup p ly an d commo n considerations on l y p o wer s u p p lies us e d f o r s u p p l y in g a n alog cir c ui ts a r e r e co mm en de d f o r p o wer in g t h e ad xrs300. h i g h f r e q uen c y n o is e a n d t r a n si en ts as socia t e d wi t h dig i t a l cir c ui t s u p p li es ma y ha v e ad v e r s e ef f e cts o n de vice o p era t io n. f i g u r e 3 s h o w s th e r e c o m m e n d e d co n n ecti o n s f o r th e a d x r s 3 0 0 w h er e bo t h a v cc a n d p d d ha v e a sep a ra t e de co u p lin g ca p a ci t o r . th ese s h o u ld be p l ace d as c l ose t o t h e t h eir r e s p ect i v e p i n s as p o s s i b l e b e fo r e r o u t in g to t h e system a n a l og s u p p l y . this wi l l minimize t h e n o ise in je ct e d b y t h e c h a r g e p u m p tha t uses t h e pdd supp ly . i t is a l so r e co mm en de d t o p l ace t h e c h a r g e p u m p ca p a ci to r s co nn e c t e d t o t h e cp1Ccp4 p i n s as c l ose t o t h e p a r t as p o s s i b l e . th ese ca p a ci t o r s a r e use d t o p r od uce t h e o n -c hi p high v o l t a g e s u p p l y s w i t c h ed a t th e d i th e r fr eq u e n c y a t a p p r o x i m a t e l y 1 4 k h z . c a r e s h o u ld b e t a k e n t h a t t h er e i s n o mo r e t h a n 5 0 pf o f s t ra y ca p a ci t a n c e betwe en cp1Ccp4 a n d gr o u n d . s u r f ace-m o un t c h i p ca p a ci t o r s a r e s u i t a b le as lo n g as th e y a r e ra t e d f o r o v er 15 v . 5v + - self test avcc st1 st2 3a 5g 4g ADXRS300 cp2 cp1 pdd 4a 5a 7e 6g charge pump/reg. 12v ptat 7f 6a 7b 7c 7d 47nf cp4 cp3 cp5 rate sensor 2g 1f 1d coriolis signal channel agnd cmid 1c sumj rate- out 2.5v 1b 2a 1e 3g temp r out 180k ? 1% resonator loop demod 2.5v ref 7k ? 35% 100nf 22nf 100nf 100nf c out r sen1 r sen 2 22nf pgnd f i gur e 4 . bl oc k diagr a m wi th ex t e r n al c o m p one n ts setting bandwidth e x ter n a l ca p a ci t o rs cm id and c ou t ar e us e d in co mb ina t io n wi t h o n -c hi p r e sis t o r s to cr e a te two lo w-p a s s f i l t ers to l i mi t t h e b a n d wid t h o f t h e ad xrs300 s ra te r e s p o n s e . th e C3db f r e q uen c y set b y r out and c out is: () = ? rev. 0 | page 5 of 8
ADXRS300 rev. 0 | page 6 of 8 betw e e n t h e ra teo u t (1b , 2a) a n d s u mj (1c, 2c) p i n s wil l r e s u l t in () () = ? increasing meas uremen t ran g e th e fu l l -s ca le m e as ur em en t ra n g e o f t h e ad xrs300 ca n b e in cr e a se d b y p l a c in g a n ext e r n a l r e sis t o r betw een t h e ra teo u t (1b , 2a) a n d s u m (1c, 2c) p i n s , w h ic h w o u l d p a ra lle l t h e in t e r n a l r ou t r e sis t o r tha t is facto r y-t r im m e d to 180 k ? ? ? using the ADXRS300 with a supply- ratiometr i c adc th e ad xrs300 s r a teo u t sig n a l is n o nra t io m etr ic, i . e., n e i t h e r th e n u ll v o l t a g e n o r th e r a t e se n s i ti v i t y i s p r o p o r ti o n al t o th e s u p p l y . r a t h e r t h e y are no m i n a l l y co nst an t fo r d c supply ch ange s w i t h i n t h e 4.75 v to 5.2 5 v o p era t in g ra n g e. i f t h e ad xrs300 is us e d wi th a s u p p l y -ra t io m e t r ic ad c, t h e ad xrs300 s 2.5 v o u t p u t ca n b e c o n v e r t e d a n d u s ed t o m a k e c o rr ecti o n s i n so ft w a r e f o r th e s u p p l y var i a t io ns. null adj u s t n u l l ad j u s t men t is p o s s i b l e b y in j e ct in g a s u i t ab le cur r en t to s u m (1c, 2c). a ddin g a s u i t ab le r e sis t o r to ei t h er g r o u n d o r t h e p o si t i v e s u p p l y is a sim p l e wa y o f ac hie v i n g t h is. th e n o mina l 2.5 v n u l l is f o r a symm et r i cal swin g ra n g e a t ra teo u t (1b , 2a). h o w e v e r , a n o n s ymmet r i c o u t p u t swin g ma y b e s u i t ab le in s o me a p plica t io n s . n o te t h a t if a r e s i s t o r is co nn e c te d to t h e p o si t i v e s u p p l y , t h en s u p p l y dis t urb a n ces ma y r e f l e c t so m e n u l l in s t a b i l i t ies. dig i t a l s u p p ly n o is e s h o u ld b e a v o ide d p a r t icu l arl y in t h i s cas e (s e e t h e s u p p ly an d c o mmo n c o n s idera t i o n s s e ct io n). th e r e s i s t o r va l u e t o use is a p p r o x ima t e l y : ) v C )/(v ( r null1 null0 null 000 180 5 2 , . = ? ? self- t es t f u nc tion th e ad xrs300 in c l udes a s e lf-tes t f e a t ur e tha t act u a t es e a c h o f t h e s e n s in g s t r u ct ur es an d as s o cia t e d ele c t r o n ics in t h e s ame iden t ica l mann er as if s u b j e c te d to an gu lar ra te. i t is act i va te d b y s t an dar d log i c hig h le v e ls a p plie d to in p u ts s t 1 (5f , 5g) , s t 2 (4f , 4g), o r bo t h . s t 1 wil l ca use a v o l t a g e a t ra teo u t e q ui va len t t o typ i ca l l y C270 mv a n d s t 2 wi l l ca us e a n o p p o si te 270 mv c h a n g e . th e se lf-t es t r e s p o n se f o l l o w s t h e viscosi t y t e m p era t ur e dep e n d en ce o f t h e p a c k a g e a t m o s p h e r e , a p p r o x ima t e l y 0.25/c. a c ti v a ti n g bo th s t 1 a n d s t 2 s i m u l t a n eo u s l y i s n o t d a m a gi n g . s i n c e s t 1 a n d s t 2 a r e n o t n e ces s a r il y c l os e l y ma t c h e d , act u a t in g b o t h sim u l t a n e o us l y ma y r e s u l t in a n a p p a r e n t n u l l b i a s s h ift. continuo us s e lf- t est th e o n e-c h i p in teg ra t i o n o f t h e ad xrs300 g i v e s i t hig h er r e l i ab i l i t y t h an is ob t a in abl e w i t h an y o t he r hig h v o l u me ma n u fact u r in g m e t h od . a l s o , i t is ma n u fact ur e d un der a ma t u r e b i mos p r oces s t h a t has f i eld-p r o v en r e lia b i l i t y . a s a n addi t i o n a l fa i l ur e det e ct io n m e as ur e, p o w e r - o n s e lf-tes t ca n b e p e r f o r m e d . h o w e v e r , so m e a p p l ica t io n s ma y wa r r a n t co n t in u o us se lf-t es t w h il e s e n s in g ra te. a p p l ica t io n n o tes o u t l inin g co n t in uo us s e lf-tes t t e c h niq u es a r e a l so a v a i la b l e o n t h e an a l og de vices w e bsi t e .
ADXRS300 pin configuration and pin function descriptions agnd temp st2 st 1 pg nd a vcc cp1 cp2 cp4 rateout gf e d c b a 7 6 5 4 3 2 1 cp5 cp3 pdd cmid sumj 2.5v f i g u re 5. bg a- 32 ( b ot to m vi ew) 32 Clead bg a pin no. mnemonic descr i ption 6d, 7 d cp5 hv filter capacit o r47 nf 6a, 7b cp4 6c, 7c cp3 charge p u mp capac i tor22 nf 5a, 5b cp1 4a, 4b cp2 charge p u mp capac i tor22 nf 3a, 3b avcc ana l og supp ly 1b, 2a rateo u t rate signal outp ut 1c, 2c sum output amp su mming unctio n 1d, 2 d cmid hf filter capacit o r100 nf 1e, 2e 2.5v 2.5 v precision r e ference 1f, 2g agnd anal og supply r e turn 3f, 3g tem p temperature voltage output 4f, 4g st2 self-test for sens or 2 5f, 5g st1 self-test for sens or 1 6g, 7f p g n d charge p u mp supply return 6e, 7e pd d charge pump s u pply t a ble 3: p i n f u nc tion d e scr i ptions 3 2-l e ad bg a rev. 0 page 7 of 8
ADXRS300 rev. 0 | page 8 of 8 outline dimensions a b c d e f g b o t t o m view 7 a1 65 4 3 top view detail a 3.65 max seating plane detail a ball diameter 7.00 bsc sq 4.80 bsc 0.60 0.55 0.50 3.20 2.50 0.44 0.25 0.15 max coplanarity 0.80 bsc a1 corner index area 21 f i g u re 6. 32-l e ad c h ip s c a l e ba ll gr id a r r a y [cs p bg a ] (bc-32) di me nsio ns sho w n i n mi ll im e t e r s esd caution esd (ele ctrostati c discharge) sensitive device. elect r osta tic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detec t i o n. al though this produc t features proprietary esd protec tion c i rc uitry, permanent damage may oc c u r on de vices subjected to hig h energy ele c tros tatic discharges. therefore, prope r esd precautio n s are recommended to av oid performance degradation or loss of functiona l ity. ordering guide ad xrs300 p r odu c ts t e mperature p a ck age p a c k age d e sc ription p a c k age outl ine adxrs3 00a bg C40c to + 85c 32-lead b g a bc-32 adxrs3 00a bg -reel C40c to + 85c 32-lead b g a bc-32 ta b l e 4 ? 2003 anal og de vices, inc. all ri ghts rese rved. tra d emarks a n d registered tra d ema r ks are the proper ty of th eir respectiv e co mpan ies. printed in the u. s.a. c03227-0-1/03(0)
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