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| fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. s e mic o n d u c t o r c o r por at ion fo r t u ne w ? f f s s 5 5 1 1 1 1 18-bit adc wi th 1 low noise op amp . d d a a t t a a s s h h e e e e t t f s 5 1 1- d s - 1 2_ en rev . 1.2 t h is m anual c o nt a i ns n e w pr oduc t inf o r m ation. for t une s e mic onduc tor corpor a t ion re se rv e s th e ri g h t s to m odif y t he pr o duc t s pec if i c ation with out f u r t her not i c e. no li abi li t y is as s u m ed b y for tune se mic ond uc tor cor por a t ion as a r e s u lt of the us e of this pr o duc t. n o r i ght s un der a n y pate n t ac c o m p an y t he s a le of the pr o d u c t. cr-0 0 4 v1 .com .com .com 4 .com u datasheet
fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e r ? ? h] ? ? ? 18- bit ad c wit h 1 low n o ise o p amp. t t a a b b l l e e o o f f c c o o n n t t e e n n t t s s pag e 1. g e neral descri p t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 2. f e a t ures ....................................................................................................................... .................. 3 3. app l ica t ions ................................................................................................................... ............. 3 4. ordering i n f o rm a t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5. p i n con f i g u r a t ion .............................................................................................................. ..... 4 6. p i n descri p t ion ................................................................................................................ .......... 5 7. f u nctional block dia g ra m ............................................................................................... 6 8. typ i ca l a p p l ica t i o n circuit ............................................................................................. 6 9. absolute maximum ra ting s ............................................................................................... 7 10. electrical characteristics ............................................................................................ 7 11 . f u nction description ........................................................................................................... .9 1 1.1 micr opr o ce ssor in te r f ac e ....................................................................................................... ............... 9 1 1.2 p o w e r sy st em ................................................................................................................... ...................... 9 11 . 2 . 1 an alog po w e r (vdd, vss a ) an d dig ita l po w e r (vc c , vss ) ................................................................... 9 11 . 2 . 2 s w itc h - able p o w e r o u tpu t ....................................................................................................... ................. 10 11 . 2 . 3 a g nd gen e rator ................................................................................................................. ..................... 10 11 . 2 . 4 ban d g a p v o ltag e r e f e ren ce a n d t e m p eratu r e s e ns or ............................................................................... 10 11 . 2 . 5 bias c u rrent sou r ce ge n e rator .................................................................................................. ............... 1 1 1 1.3 clock g e ne rato r ................................................................................................................ .................. 1 1 1 1.4 f unc ti on net w ork ............................................................................................................... ................. 12 11 . 4 . 1 an alog m u ltiple x : .............................................................................................................. ....................... 12 11 . 4 . 2 op a m p .......................................................................................................................... ........................... 13 11 . 4 . 3 t h e op eratio n o f th e delta - s i g m a ( ? ) modu lator a d c ......................................................................... 13 12. app l ica t ion sam p le ............................................................................................................. .. 17 13. p a c k a g e in f o rma t ion .......................................................................................................... 19 13.1 p a ck age out lin e, di p 2 0 ......................................................................................................... ............. 19 13.2 p a ck age out lin e, s o p 2 0 ......................................................................................................... ............ 20 14. revision hist or y ............................................................................................................... ...... 21 fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 2 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 1. general descrip t i o n t he f s 51 1 is a hi gh- r e s o l u tio n an al og- to- d ig it a l c o n v er ter ( a dc) c h ip. t he c o r e of this c h ip is an 1 8 - b it re so l u t i o n ' 6 adc. bes i de s the ' 6 adc , f s 51 1 c ons is t s of s w itc h in g c i r c u i t s , o per ati o n a l am plif ier , d i g i t a l f ilter , c r y s t a l os c ill ati o n c i r c uit s , d i gital c ontr o l lo gic , an d m i c r opr oc es s o r in ter f ac e. un d e r 5 v wor k ing voltage , t h is c h ip c ons um es 1.2 m a po wer . 2. features z de lt a - s i gma a d c, 1 8 - bit h i gh-r e s o lution 1 0 hz output r a te (pr ogr a m m a ble ) . z l i n earit y e rro r: r 0. 00 5 % f s z v o lt a g e ope ra tion r a nge s fr om 4 . 5 v to 6 v . z 4m hz cry s t a l o scill at o r . z ope r a t ion c u rr e n t i s le s s tha n 1 . 2 m a ; s l e e p mod e c u r r e nt i s a bout 1 p a. z spi in t e rf a ce t o m i cro - pro cesso r z pac kag e: 2 0 - p in di p , 20- p i n so p . 3. applications z elect ro n i cs weig h sca l e z s e ns o r or t r a n s duc e r me a s u r e m e nt a pplic a t ion z othe r s fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 3 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 4. orderi ng infor m ation pr oduct n u mb er d escr iption packag e t y pe f s 51 1- pi d i p20 pb fr ee p a c k ag e p a rt n u mbe r . dip2 0 (pb free p a cka ge) f s 51 1- phb so p20 pb fre e p a c k age p a rt n u mbe r . so p2 0 (pb free p a cka ge) 5. pin con f iguration fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 4 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 6. pin des cription na me a t tr ibute p i n n o de s c r i p t i o n f t b aio 1 adc pr e- f i l t er ca p a c i t o r c onnec t i on an d i npu t h i gh f t c aio 2 adc pr e- f i l t er ca p a c i t o r c onnec t i on an d i npu t l o w op o a i o 3 op a m p o u t p ut o p n a i o 4 o p amp neg a ti v e inp u t o pp aio 5 o p amp pos i ti ve inp u t vrl aio 6 input ref e r enc e v o lt a ge lo w of the adc sg n d a i 7 sig n a l g r oun d vrh ai 8 input ref e r enc e v o lt a ge hi gh of the adc ag n d a p i o 9 ana l o g g r oun d v s a p o 1 0 v o lt a g e s our c e vs sa api 1 1 ana l o g ne gat iv e p o w e r su ppl y vdd pi 12 pos i t i v e po w e r su ppl y vs s api 13 dig i t a l neg a ti ve p o w e r sup p l y vcc dpo 14 po w e r su pp l y f o r di gital si gna l xt alo do 15 4mh z o s c ill ator o u tput xt ali di 16 4mh z o s c ill ator i npu t sdo /irq o do 17 spi dat a o u tp ut or inter r u p t r eques t out put sdi di 18 spi dat a inp u t scl k d i 1 9 s p i cl oc k i n p u t /cs dio 20 chip s e lec t of dig i t a l int e r f ac e not a t i ons : d s t ands f o r digi t a l. a s t ands f o r an alo g . p s t ands f o r po w e r . o s t ands f o r o u tput. i s t an ds f o r input. f o r ex am ple: dio m eans ? d igital i nput /o utp u t? . fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 5 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e r ? ? h] ? ? ? 18- bit ad c wit h 1 low n o ise o p amp. 7. f unct i onal block diagra m cs op p sgnd opamp & n e t w o r k m odul ator cloc k g e nera tor di g i t a l filt er pow e r s y ste m di gi t a l i n te r f a c e a nd c ontr o l r e gis t ors xtal i x t a lo vrl vdd vs vs s agn d di s k opo opn ftb f tc vc c vr h do/ irqo v ssa __ _ 8. typical applicati o n circuit fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 6 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 9. a b s o l u te m a x i mu m r a ti n g s p a ra me te r r a t i n g unit sup p l y v o lt a ge t o g r oun d pote nti a l - 0 .3 to 10 v app l i ed i npu t/o utp u t v o lt a g e -0.3 to vdd + 0 . 3 v am bient o per ati ng t e m per atur e r ang e - 40 to +8 5 : s t or a ge t e m per atur e ran g e - 55 to +1 50 : sol der i ng t e m per atur e ( 10 sec ) 260 : esd t o ler anc e hum an bod y mo de l ( h b m ) : 2k v mac h i ne mod e l ( m m) : 2 00v 10. electrical characteristics dc char acte r istic s (vd d = 5 v , t a =2 5 : , unle s s othe rw is e note d ) p a r a m e t e r t est condit i o n s m i n . ty p . m a x . unit a n a l og-to-digit a l conv e r te r z e r o inp u t r ead ing vin = 0 v , v r ef =50 0 m v , c ys= 01 - 15 15 ? v lin ear it y ( m ax . de v i at ion f r om bes t s t r a ight li ne f i t) vin= d 0.9 v r ef , v r ef =50 0 m v , cy s = 01 - 2 5 2 5 ? v input com m on- mode r e j e c t ion rati o vcm = ag n d d 1 v , vin = 0. 25 v , v r ef =500m v 1 5 0 ? v/ v nois e ( p - p v a lu e no t ex c e e d in g 95% of t i m e ) vin = 0 v , 500m v sc a l e 5 10 ? v ro ll o v e r e rro r (d i f f e re n c e in r eadi ng f o r eq ual pos iti v e a nd nega ti ve inp u t s ne ar f u l l s c ale) - v in= + v in =50 0 .0 0m v 0 1 0 5 0 ? v sc ale f a c t or t e m per atur e coeff i c i ent vin = 50 0.00m v , - 1 0 : fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e r ? ? h] ? ? ? 18- bit ad c wit h 1 low n o ise o p amp. 11. function descri p t ion 11. 1 micr opr o ce ss or inte rface f s 51 1 c an be dir e c t l y c onn ec ted t o a n y m i c r opr oc es s o r b y pi ns of cs _, sk, di, d o /irq o . it c a n ac c e s s the r ead/ w r i t e of th e c ontr o l r e g i s t er s , han dl e i n ter r upt s , an d ac c e s s the m eas ur e r egis t er s . d< 6 > d< 5 > d< 4 > d< 3 > d< 2 > d< 1 > d< 7 > d< 0 > 0 a< 1 > a< 0 > cs_ di do sk ir qo wr it ing m ode a< 2 > a< 1 > a< 0 > cs_ di do sk ir q o readi n g m ode d< 7 > d< 6 > d< 0 > d< 1 > d< 2 > d< 3 > d< 4 > d< 5 > ir qo 1 0 0 cs_ di do sk ir q o readi ng a d c d< 2 3 > d< 2 2 > d< 0 > d< 1 > ir qo d< 2 1 > d< 2 > if adc d a t a c o n v ers e c o m p let e , irq o wil l b e h i gh to lo w . 11. 2 pow e r sys t em 11.2.1 analog p o w e r (vdd, vssa) a nd dig i tal po w e r (vcc, vss) adc, o p a m p an d a n a l og c i r c uit us e d an al og p o w er ( v dd, v s s a ) . vdd t y p i c a l l y i s 5v . dig i t a l int e r f ac e and d i g i t a l c i r c uit us e d di gital po w e r ( v cc, vs s) . fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 9 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e r ? ? h] ? ? ? 18- bit ad c wit h 1 low n o ise o p amp. 11.2.2 s w itch-able pow e r output t e r m inals of v s is th e s w it c h - able p o w er out put of v dd. t he pmo s s w itc h is c ontr o l l e d b y e n v s c ontr o l s i gna l. w h en env s = 1, the s w itc h is s hor t. 11.2.3 agnd ge nerator ag nd is ana lo g c o m m on volt a ge. w hen eng n d b = 0 , ana log c o m m on vo lt ag e g e ner ator wil l ac t i v e . 11.2.4 bandga p v o lta g e refe r e nce and t e m p eratu r e sensor . ref o is lo w t e m per atur e c oeff i c i ent ban dga p v o ltage r e f e r enc e out put. w hen enba nd= 1, t he c i r c u i t wil l a c tive . t he output v o lt a ge t o ag n d is ab out 1.2 v . t y p i c a l te m per atur e c oef f i c i ent is 100 ppm / . { t emph, t e mpl} is pr op or tion to am bient tem per atur e . y o u c an s e lec t th em to ad c in put and tr ans f e r to d i gital c ode. ( t y p ic al 500 uv 50 uv / ) fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 1 0 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 11.2.5 bias curr ent so ur ce generator t he bias c u r r ent f o r a ll t he ana log c i r c uit s of f s 51 1. if the em bedd ed o p am p wor k s , ref o wi ll be p u l l ed to ag n d b y t he f eed bac k ; ther e ar e 1.2v in r e s i s t or 4 0 0 k , a nd 3u a b i as c u r r ent c a n b e obtain ed. 11. 3 clock generat o r w e c onnec t a 4 m h z c r y s t a l os c ill ator to the c l oc k gene r a tor to g ener a t e a 4mh z c l oc k f r equenc y . a f r equ enc y di vid e r is us e d to di v i de th e c l oc k s i gnal to g ener ate a s i gn al f s , and the adc us es this f s s i g n a l to do data c onver s i on. enx t b e n a d f s l h 83.3 3 k h z h l 0 , ( l ) fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 1 1 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 11. 4 f uncti on n e t work 11.4.1 analog m u ltiplex : 1. lo w pas s f i l t er in put: sinh[ 1 : 0 ] 0 0 0 1 1 0 1 1 sel e c t o p o o p h s g n d t e m p h 2. adc n ega ti ve i npu t: sinl[ 1 : 0 ] 0 0 0 1 1 0 1 1 sel e c t v r l v r h sg n d t e m p l fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 1 2 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 3. lo w pas s fil t er o u tp ut, ad c pos i ti v e i n p u t: sft a [ 0 ] 0 1 sel e c t f t b f t i n 4. ex ter n a l f i lter c ontr o l: sf t a [1] = 1, f t in and f t b s hor t; sf t a [1] = 0, f t in an d f t b op en. 5. inter n a l r e f e r enc e v o lt ag e contr o l: svr 0= 1, ( v rh,v r l) = 1 v ( a t vd d= 5v) . sv r 1 =1 , sgnd= 1/2( vrh, vrl). 6. adc r e f e r enc e v o lt ag e ne gati v e inp u t: svr l 0 1 sel e c t v r l ag n d 7. adc r e f e r enc e v o lt ag e p o s i ti ve i nput : svr h 0 1 sel e c t v r h r e f i 8. o p amp ref e r enc e vo lt ag e input : so pl [1:0 ] 0 0 0 1 1 0 1 1 sel e c t v r l v r h sg n d ag n d 11.4.2 op amp 1. o pen is th e o p a m p ena bl e c ontr o l s i g n a l . 2. o p c [1: 0 ] c an s e t o p amp i nput o per at io n m ode as f o llo w s , 00: +o f f s e t, 01: - o f f s e t, 2kh z c h o pper f r eque nc y , 1 1 : 1 k h z ch opp er f r equen c y . 11.4.3 the oper ation o f the delta-sig m a ( ' 6 ) modulator adc t h is hig h r e s o lut i o n adc is des ign e d b y t h e tec h no log y of de lt a- s i gm a ( ' 6 ) m odulator . t he c ont in uous ana log s i g n a l s ar e s a m p led b y a ver y hi gh s a m p ling r a t e th at is m u c h h i gh er t han t he ban d w i d th of th e in put s i gna l. t he delt a - s igm a m odulator c onver t s th e in put s i gna l t o a s e r i es of 1- bi t c odes . t hes e 1- b i t c o d e s ar e the n f ed to the di gital f ilter to f ilter o u t t he hi gh f r equ enc y q uan ti za tion n o is e to f i nd h i gh r e s o l u tio n di git a l out put s . t h is k i nd of adc q uant i z es on e bi t in t he an al og p a r t, t her ef or e, i t has ver y go od lin ear it y . b e c aus e it is in a f u l l y diff er enti a l c onf igur at ion, th e c o m m on m ode r e j e c t ion r a ti o ( c mr r) is v e r y hi gh and c a n r e duc e t he c o m m on m ode s i gna ls ef f e c t ivel y . analo g integrato r digital low pass decimation filter comparator analo g inpu t v in d out 1, -1, -1, 1, 1, 1,.... v ref , -v ref , -v ref , v ref , v ref , v ref ,... da c t he s y m b o lic d i agr am of the de lt a- sigm a a n a l og- t o - d ig it al con v er t e r fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 1 3 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. t he s y m bolic d i agr am of the de lt a- s i gm a adc is s h o w n as abo ve . it c ons is t s of a n ana lo g s ubtr a c t o r , an int e gr ator , a c o m p ar ator , a 1- b i t dig i tal- to- a nal og c o n v er ter ( d a c ) , an d a l o w - p a s s d i gital f ilter . t he an al og s i gn als ar e c ontin uous l y s a m p led an d ar e s ubtr a c t e d b y t he ex p e c t ed vo lt ag e. t he dif f er enc e of the s i g n a l s is f ed i n t o the inte gr ator , and t hen t he s i g nal is c o m p ar ed with a r e f e r enc e v o lt a ge to f i n d a di git a l out put. t h is di git a l ou t put is c onver t ed b y th e 1- b i t da c to bec om e an an alo g s i gna l ( + v r ef or - v r e f ) and t hen n egat i v e l y f ed b a c k into the inte gr ator . due to t he i n f i nit i v e dc ga in of the int egr at or , if the c hang e of the in p u t s i gna l is m u c h s l ow er th an th e s a m p lin g s pee d, t he a v er a ge voltage obtain ed b y the delta- s igm a m odulat or w i ll be ver y c l os e t o th e i nput s i gn al . in s o m e r e s o lution the y c a n be tr ea ted t o be t he s a m e , ther ef or e, t he 1- b i t o u tp ut dat a f r om the c o m p ar ator ar e equ iv ale n t t o th e r v r ef an alo g s i g n a l v a l ues . t he di git a l f ilt er the n d e c i m a tes the 1- b i t dat a to get a ver y hig h r e s o lut i on di gital c o de. ena d ( a dg <7 >) is th e e n a b le c ontr o l s i gn al f o r th e a dc. it is 1 to e nab le th e a dc; it is 0 t o t u r n off the a dc a n d ca n sa ve p o w e r . 11.4.3.1. g a in s t age setting t her e ar e f our diff er ent gai n p a ths t o th e i npu t of the f s 51 1 adc , an d th e y ar e c ontr o l l e d b y c ontr o l r e gis t er adg [ 3: 0]. t w o d i f f er ent g a i n p a ths c o n t r o l th e inp u t r e f e r enc e v o lt a ge, an d t h e y a r e c ontr o ll ed b y c o n t r o l r e g i s t er adg [ 5: 4]. t he ga ins s h o w n her e ar e no t ac c u r a te . t he ac c u r a te g a i n s c an b e f o u nd b y c a r e f u l c a li br ati on. 0.5 0.5 0.25 0.1 v i n (in +, i n - ) adg[ 0 ] adg[ 1 ] adg[ 2 ] adg[ 3 ] t o adc sig n a l i n put 1.0 0.25 vr e f ( v r +, v r- ) adg[ 4 ] adg[ 5 ] t o adc re fer e n c e in p u t diagr am of f s 51 1g ai n s t age sett in g b y pr o per s e lec t io n of the gai n p a ths , th is adc c an be app li ed to t he op tim u m d y nam ic r ange f o r all th e m eas ur ing app lic a t io ns . t a ble s h o w s v a l ues of a d g [ 5: 0] f o r thr ee f r eque nt l y us ed app lic at ions . f i r s t sc al e sec o n d sc a l e t h ir d sc al e adg < 5:0 > 0 1 _ 0 01 1 1 1_01 1 1 1 1_1 0 0 0 ref e r enc e v o lt ag e g a i n g refi u 1.0 u 1.25 u 1.25 input v o ltage g a i n g sigi u 1.0 u 1.25 u 0.1 t able: f s 51 1 ad c t y pic a l g a in set t in g t he tr ans f e r f unc tion f o r ea c h s c a le is as f o llo w s , equ a ti on 1 ref x refi sigi x v v g g d u t he gai ns f o r th e r e f e r enc e vo lt ag es a nd in put v o ltages s h o w n in t able ar e appr ox i m ate val ues . t he ac c u r a te gai ns f o r the r e f e r enc e vo ltages a nd inp u t voltag es c an be f o u nd b y c a r e f u l c a l i br atio n. 11.4.3.2. digit a l f ilt er in s y m b o lic d i agr am of th e de lt a- s i gm a ana l o g - t o- dig i t a l co nv er ter , t he 1- bi t outp u t of th e c o m p ar ator s houl d b e f ed t o t he di git a l l o w p a s s f ilt er to d o d e c i m a tion to f i n d t he hi gh r e s o lu tio n m u ltip le- b it d i g i t a l o u tp ut. t he tr ans f e r f unc tion of the f s 5 1 1 d i gital f i lter is : fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 1 4 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. equ a ti on 2 33 333 33 3 () ( ) () 2 2 sin sin 1 ? ? ? ? ? ? ? ? = w h er e n is t a p of the dig i tal f ilt er . sup pos e the s a m p ling r a t e of th e adc is 83. 3kh z , the t a p of th e d i g i t a l f i l t e r is 8 192 . w e c an f i nd th e f r equenc y r e s p ons e d i a g r a m o f the dig i t a l f ilt er as s h o w n i n f i g . t he f i r s t zer o is at: equ a ti on 3 33 333 33 33 hz 10 8192 hz 83333 1 ? = = t he f r equenc y res p ons e diagr am of f s 51 1 dig i t a l f i lter 0 20 40 60 80 10 0 -200 -150 -100 -50 0 hz db t he z e r o po int s f a l l at m u lt ipl e s of 1 0 h z . t he dig i t a l f i lter wil l f i lter out a l l the s i g nals near the zer o po int s . f r o m above f i gur e., we c a n f i nd that the nois e s a t 50h z an d 60 h z ar e s uppr es s e d ver y wel l . if the s a m p lin g r a te is 83kh z and the t a p of the f ilt er is 16 38 4, th e f i r s t z e r o - f r equenc y is at 5 h z. t he output r a te is s e l e c t ed b y t ps [2 :0]. t ps [2:0] ta p ( n ) ad c o u tput r a te and f i r s t z e r o f r equ enc y hz 1 1 1 1 6 3 8 4 5 1 1 0 8 1 9 2 1 0 1 0 1 4 0 9 6 2 0 1 0 0 2 0 4 8 4 0 01 1 1 0 2 4 8 0 0 1 0 5 1 2 1 6 0 0 0 1 2 5 6 3 2 0 0 0 0 1 2 8 6 4 0 11.4.3.3. reading and calculati n g of digital-to-analog converte r due to the m anuf ac tur e pr o c es s dr ift, ther e is an off s et vo lt ag e in the fs 51 1 ad c s u c h th at an offs et va lu e is ex is ted i n the adc o u tpu t. i n or der to e lim inate t he off s et va lu e, f s 5 1 1 pr o v i des th r ee oper a t io n m odes , w h ic h c an be s e t b y c y s <1: 0 > of c o ntr o l r e g i s t er n e t d . t he a d o out put an d c a lc ul ati on ar e d i ff er ent in diff er ent op er atio n m odes , and th e y ar e d e s c r ibed in t he f o l l o w in g s ubs ec tion . a dc ou t p u t ado set c y s < 1:0 > = 00, the ad c in put s ar e s h or t c i r c uit ed, and we c a n f i nd t he n e g a ti ve of f s et voltage of the ad c fr o m ado [ 23 :0]. set c y s < 1:0 > = 1 1, we c a n f i nd the eq ui va lent v o lt a ge of the i nput s i gn al f r om ado [ 23:0]. fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 1 5 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. set c y s < 1:0 > = 01, and the ado [ 23 :0] outp u t is t he va l ue of an ide a l ad c. t h is m ode is s u it a b le f o r h i gh r e s o lut i o n m eas ur e m ent. w h en c ys< 1:0 > z 01, t he outp u t r a te of ado [ 23:0 ] i s the f i r s t zer o f r equ enc y , , of co m b as des c r ib ed in equ a ti on 3. w hen cys < 1: 0 > = 01, the out put r a te e q u a l s 1 z f 2 1 z f . 11.4.3.4. the conversion of the digital codes and eq ui valent v o ltage t he outp u t of the f s 51 1 a dc is ado [ 23: 0], whic h is a 2 4 - b it 2? s c o m p lem ent n u m ber . ado [ 23 :0] is t h e s i g n b i t; 0 r epr es ent s a pos it iv e num ber , and 1 r epr es e n t s a n ega tiv e num ber . t he dec im al p o int lies i n bet ween a d o [ 22 ] an d ado [ 21 ]. if ado [ 23: 0] =00 10_ 100 0_0 000_ 000 0_0 00 0_0 000, the equ iv ale n t f l oa tin g p o i n t n u m ber is : e q ua t i o n 4 625 . 0 125 . 0 5 . 0 2 0 ...... 2 0 2 0 2 1 2 0 2 1 0000 _ 0000 _ 0000 _ 0000 _ 1000 _ 10 . 00 22 5 4 3 2 1 u u u u u u ado if ado [ 23: 0] =1 1 01_1 1 1 1 _ 1 1 1 1_1 1 1 1_1 1 1 1_1 1 1 1 , the eq ui val ent f l o a ti ng po int num ber is : e q ua t i o n 5 5000002384 . 0 2 1 ...... 2 0 2 0 2 0 2 1 ( ) 0001 _ 0000 _ 0000 _ 0000 _ 0000 _ 10 . 00 ( 1111 _ 1111 _ 1111 _ 1111 _ 1111 _ 01 . 11 22 4 3 2 1 u u u u u ado f r o m equa tio n 1, if ga in equa ls 1 an d r e f e r enc e vo lt ag e v =1. 000 00 v , the v a l ue of ado , 0010 _10 00_ 00 00_ 000 0_0 0 00_0 000 , c an be us ed t o c a lc ul ate the m eas ur ed vo lt a ge as : ' g ref v 62500 . 0 625 . 0 1 v 00000 . 1 ' u u x ref x d g v v if ado = 1 101 _1 1 1 1_1 1 1 1_1 1 1 1_1 1 1 1_1 1 1 1 , the m eas ur ed voltage c an b e c a lc u l a t e d : v 50000 . 0 5000002384 . 0 1 v 00000 . 1 ' u u x ref x d g v v ho w e ver , du e to the m anuf ac tur e pr oc es s dr ift is not ex ac tl y eq ual to 1, a nd t her e w i ll be ar oun d ' g % 1 r of f s et. sim ilar l y th e r e f e r enc e vo ltage s o ur c e and r e s i s t or s m a y aff e c t the r e f e r enc e v o lt a ge , and m a k e not t o be ex ac t 1.00 000 v . t her ef o r e, w e h a v e to c a l i br at e th e adc. ref v ref v 11.4.3.5. ot he r c o nt r o l set t i ng cpv r is the en hanc em en t m ode f o r r e s i s t anc e m e as ur ing. it is s e t to 1 to i m pr ove the li near i t y when m eas ur ing r e s i s t anc e. fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 1 6 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 12. application sa m p le ex am ple net w or k s e tting: m o d e n e t a net b net c net d a d c 8 8 h 0 0 h 9 3 h 5 7 h o p am p+ a d c 8 8 h e 0 h 9 3 h 5 7 h demo a s s e mbl y code for digit a l interfa ce: endm ; = ==== === === === === ==== === === di_ 0 m a c r o ; f s 51 1_r w . asm ver s io n 0. 0 bc f f s 51 1 _ pt ,1 ; f s 51 1 re ad/ w r ite us e f s 9822 dl y ; ed it b y j o ng 2003 /6/2 7 endm ; = ==== === === === === ==== === === di_ 1 m a c r o addr _ b f eq u eah bs f f s 51 1 _ pt ,1 r w _b f eq u al dl y rd_c nt1 eq u c oun ter 0 endm rd_c nt2 eq u c oun ter 1 sk _pls m a c r o cs_ eq u 3 ; por t 3 b i t 3 sk _1 sk _ eq u 2 ; por t 3 b i t 2 sk _0 di_ eq u 1 ; por t 3 b i t 1 endm do _ eq u 0 ; por t 3 b i t 0 f s 51 1 _ pt eq u pt 3 w r 5 1 1 m a c r o d1,d2 f s 51 1 _ pt en eq u pt 3en mo v l f d1,a ddr _ b f f s 51 1 _ pt pu eq u pt 3pu mo v l f d2,r w _b f s t atus eq u 4 c a ll _51 1 w wo r k e q u 5 endm c equ 1 rd51 1 m a c r o d1 ;------ ---- ---- ---- ---- ---- ---- ----- - ------ - mo v l f d1,a ddr _ b f ; us er def in e m a c r o c a ll _51 1r ;------ ---- ---- ---- ---- ---- ---- ----- - ------ - endm dl y m a c r o ;------ ---- ---- ---- ---- ---- ---- ----- - ------ - nop ; init ia l of port endm ;------ ---- ---- ---- ---- ---- ---- ----- - ------ - c s _0 m a cr o 51 1_ in i: bc f f s 51 1 _ pt ,3 bs f f s 51 1 _ pt en,c s_ dl y bs f f s 51 1 _ pt en, s k _ endm bs f f s 51 1 _ pt en,di _ c s _1 m a cr o bc f f s 51 1 _ pt en,do _ bs f f s 51 1 _ pt ,3 bs f f s 51 1 _ pt pu,do _ dl y bs f f s 51 1 _ pt ,cs_ endm re tu rn sk _0 m a cr o bc f f s 51 1 _ pt ,2 dl y endm sk _1 m a cr o ; 3.2 u s ;------ ---- ---- ---- ---- ---- ---- ----- - ------ - bs f f s 51 1 _ pt ,2 fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 1 7 / 2 1 fs51 1-d s -12_en r e v . 1.2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 ; f s 51 1 re gis t er w r ite s ub f unc tion dl y .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e r ? ? h] ? ? ? 18- bit ad c wit h 1 low n o ise o p amp. sk _pls ; us e ad dr _bf as ad dr es s b u f f er c a ll g e t_data ; us e r w _b f as w r ite dat a buff e r bt f s c addr _ b f , 2 ;------ ---- ---- ---- ---- ---- ---- ----- - ------ - c a ll g e t_adc _51 1 w : m o v w f r w _ b f c s _0 c s _1 di_ 0 ; 0 di_ 0 sk _pls re tu rn d i _0 ; bt f s c addr _ b f , 1 ;a< 1 > g e t_data: d i _1 ; cl rf wo rk ; rd _ t m p sk _pls bs f r d_c nt1,3 d i _0 ; g e tloop : bt f s c addr _ b f , 0 ;a<0 > c l r f s t atus ,c d i _ 1 ; rl f wo rk ,1 sk _pls bt f s c f s 51 1 _ pt ,0 d i _0 ; w r bs f work ,0 sk _pls sk _pls sen d_d at a: dec f s z r d_cnt1 , 1 bs f rd_c n t1, 3 goto g e tloo p c l r f s t atus ,c re tu rn send loo p: r l f r w _b f , 1 g e t_adc : d i _0 ; m o v w f r w _ b f+ 2 bt f s c s t atus ,c ;d fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 13. p a ck age inf o rm a t ion 13. 1 p a ck age outl ine, d i p 20 fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 19/ 21 t d - y y m m 0 0 1 r e v . 1 . 2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet fs51 1 s e m i conduct o r c o r por a t i o n f or t u n e ? w? ? 18- bit ad c wit h 1 low n o ise o p amp. 13. 2 p a ck age outl ine, s o p 20 fort une s e m i c ondu c t or corp. te l : +886-2-2809-4742 20/ 21 t d - y y m m 0 0 1 r e v . 1 . 2 ht tp :/ / w w w .f s c . c o m . t w f a x : +886-2-2809-487 4 cr-004v 1 .com .com .com .com 4 .com u datasheet FS511 semiconductor corporation f or t u n e r?? h]? ?? 18-bit adc with 1 low noise opamp. fortune semiconductor corp. tel : +886-2-2809-4742 21/21 td-yymm001 rev. 1.2 http://www.fsc.com.tw fax: +886-2-2809-4874 cr-004v1 14. revision history ver. date page description 0.3 unknown - initial version of document. 1 revise "electrical characteristics, micro-process interface, power system, clock generator, function network, application note? 2 18-bit high-resolution 10hz output rate (programmable) . 3-4 revise ?specification table?. 8 delete ?bandgap voltage reference and temperature sensor? 9-10 deleted bandgap voltage reference and temperature sensor network setting. 1.0 2003/12/8 15-16 add ?example network setting? and ? demo code for digital interface? all reformat and correct the contents 7 add ?absolute maximum ratings?. 10 add back ?bandgap voltage reference and temperature sensor? 12 add back ?bandgap voltage reference and temperature sensor? network. 1.1 2004/9/13 19 add ?package information? 4 add sop20 pb free package part number. 20 add package outline, sop20 1.2 2005/7/31 21 add revision history .com .com .com 4 .com u datasheet |
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