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dual/quad low power, high speed jfet operational amplifiers op282/op482 rev. f in fo rmation furn ished by an alog d e v i c e s is believed to be accurate and reliable. how e ver, n o resp on sibili ty is assume d b y a n alog de vices fo r its use, nor for an y i n fri n geme nt s of p a t e nt s or ot h e r ri ght s o f th ird parties th at may result fro m its use . s p ecificatio n s subj ec t to ch an g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot herwi s e u n der a n y p a t e nt or p a t e nt ri ghts of analog de v i ces. trademarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2004 analog de vices, i n c. al l r i ght s r e ser v ed . features high slew rate: 9 v/s wide bandwi dt h: 4 mhz low supply current: 250 a /amplifier max low offset voltage: 3 mv max low bias current: 100 pa max fast settling ti me common-mod e range includes v+ unity-gain st a b le applic ati o ns active fi lters fast amplifiers integrators supply current monitoring gener a l description the o p 282/o p 482 d u al and q u ad o p er a t io nal am p l if iers f e a t ure exce l l en t s p e e d a t excep t io nal l y lo w s u p p l y c u r r en ts. th e s l e w ra t e is typ i cal l y 9 v/s wi t h a s u p p l y c u r r en t un der 250 a p e r a m plif ier . t h es e uni t y - gain st a b le a m plif iers ha v e a ty p i ca l ga i n b a ndwi d t h o f 4 mh z. the jfet in p u t s t a g e o f t h e o p 282/o p 482 en sur e s b i as c u r r en t is typ i cal l y a fe w p i co a m ps and b e lo w 500 pa o v er th e f u l l t e m p era t ur e ra ng e . of fs et v o l t a g e is un der 3 mv fo r t h e d u al a nd u n der 4 m v fo r t h e q u a d . w i t h a wi de o u t p u t s w ing, wi t h i n 1.5 v o f e a ch su p p ly , lo w p o w e r co n s um p t io n, an d hig h s l ew ra t e , t h e o p 282/o p 482 a r e ide a l fo r b a t t e r y -p o w er e d sys t em s o r p o w e r r e s t r i c t e d a p plic a t ion s . an in p u t co mm on-mo d e ra n g e t h a t i n cl udes t h e p o si ti v e s u p p l y mak e s t h e o p 2 82/o p 482 a n exce l l en t ch o i c e f o r h i gh - s id e s i gn al c o n d i t i o ni n g . the o p 282/o p 482 a r e s p ecif ie d o v er th e ext e nded ind u s t r i al t e m p era t ur e ra ng e . the o p 282 is a v a i la b l e in t h e s t anda r d 8-lead na r r o w so i c an d mso p p a c k a g es. th e o p 482 is a v a i la b l e i n pdi p a nd na r r o w soi c p a cka g es . pin c o nnec t io ns 1 2 3 4 5 6 7 8 o ut a ?in a +in a v? op-482 v+ out b ? in b +in b op282 00301-001 f i gure 1. 8-l e ad n a rro w - b o dy soic (s- s uffi x) [r -8] 00301-002 out a 1 ?in a 2 +in a 3 v? 4 v+ 8 out b 7 ?in b 6 +in b 5 op282 top view (not to scale) f i g u re 2. 8-l e ad m s op [r m - 8] 1 2 3 4 5 6 7 14 13 12 11 10 9 8 out a ?in a +in a v+ +in b ?in b out b out d ? in d +in d v? +in c ? in c out c op482 ? + +? ? + +? 00301-003 f i g u re 3. 14-l e ad p d ip ( p -suf f i x ) [n- 1 4 ] 1 2 3 4 5 6 7 14 13 12 11 10 9 8 out a ?in a +in a v+ +in b ?in b out b out d ?in d +in d v? +in c ?in c out c op482 00301-004 f i g u re 4. 14-l e ad n a r r o w - b ody soic ( s -suf f i x ) [r-14]
op282/op482 rev. f | page 2 of 16 table of contents specifications ..................................................................................... 3 electrical characteristics ............................................................. 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 typical performance characteristics ............................................. 5 applications information .............................................................. 12 high-side signal conditioning ................................................ 12 phase inversion ........................................................................... 12 active filters ............................................................................... 12 programmable state-variable filter ......................................... 13 outline dimensions ....................................................................... 14 ordering guide .......................................................................... 16 revision history 10/04data sheet changed from rev. e to rev. f deleted 8-lead pdip .........................................................universal added 8-lead msop .........................................................universal changes to format and layout.........................................universal changes to features.......................................................................... 1 changes to pin configurations....................................................... 1 changes to general description .................................................... 1 changes to specifications ................................................................ 3 changes to absolute maximum ratings ....................................... 4 changes to table 3............................................................................ 4 added figure 5 through figure 20; renumbered successive figures............................................................................. 5 updated figure 21 and figure 22 ................................................... 7 updated figure 23 and figure 27 ................................................... 8 updated figure 29 ............................................................................ 9 updated figure 35 and figure 36 ................................................. 10 updated figure 43 .......................................................................... 11 changes to applications information.......................................... 12 changes to figure 44...................................................................... 12 deleted op282/op482 spice macro model section.................... 9 deleted figure 4................................................................................ 9 deleted op282 spice marco model ............................................. 10 updated outline dimensions ....................................................... 14 changes to ordering guide .......................................................... 14 10/02data sheet changed from rev. d to rev. e edits to 8-lead epoxy dip (p-suffix) pin......................................1 edits to ordering guide ...................................................................3 edits to outline dimensions......................................................... 11 9/02data sheet changed from rev. c to rev. d edits to 14-lead soic (s-suffix) pin .............................................1 replaced 8-lead soic (s-suffix)................................................. 11 4/02data sheet changed from rev. b to rev. c wafer test limits deleted ................................................................2 edits to absolute maximum ratings ..............................................3 dice characteristics deleted............................................................3 edits to ordering guide ...................................................................3 edits to figure 1.................................................................................7 edits to figure 3.................................................................................8 20-position chip carrier (rc suffix) deleted ........................... 11
op282/op482 rev. f | page 3 of 16 specifications electrical characteristics at v s = 15.0 v, t a = 25c, unless otherwise noted; applies to both a and g grade. table 1. parameter symbol conditions min typ max unit input characteristics offset voltage v os op282 0.2 3 mv op282, ?40c t a +85c 4.5 mv v os op482 0.2 4 mv op482, ?40c t a +85c 6 mv input bias current i b v cm = 0 v 3 100 pa v cm = 0 v 1 500 pa input offset current i os v cm = 0 v 1 50 pa v cm = 0 v 1 250 pa input voltage range ?11 +15 v common-mode rejection ratio cmrr ?11 v v cm +15 v, ?40c t a +85c 70 90 db large signal voltage gain a vo r l = 10 k? 20 v/mv r l = 10 k?, ?40c t a +85c 15 v/mv offset voltage drift ?v os /?t 10 v/c bias current drift ?i b /?t 8 pa/c output characteristics output voltage high v oh r l = 10 k? +13.5 +13.9 v output voltage low v ol r l = 10 k? ?13.9 ?13.5 v short-circuit limit i sc source 3 10 ma sink ?12 ?8 ma open-loop output impedance z out f = 1 mhz 200 ? power supply power supply rejection ratio psrr v s = 4.5 v to 18 v, ?40c t a +85c 25 316 v/v supply current/amplifier i sy v o = 0 v, ?40c t a 85c 210 250 a supply voltage range v s 4.5 18 v dynamic performance slew rate sr r l = 10 k? 7 9 v/s full-power bandwidth bw p 1% distortion 125 khz settling time t s to 0.01% 1.6 s gain bandwidth product gbp 4 mhz phase margin ? o 55 degrees noise performance voltage noise e n p-p 0.1 hz to 10 hz 1.3 v p-p voltage noise density e n f = 1 khz 36 nv/ hz current noise density i n 0.01 pa/ hz 1 the input bias and offset c urrents are characterized at t a = t j = 85c. bias and offset currents are guaranteed but not tested at ?40c.
op282/op482 r e v. f | pa g e 4 of 16 absolute maximum ratings table 2. p a r a m e t e r s r a t i n g s supply voltage 18 v input voltage 18 v differential input voltage 1 36 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 p-suffix (n), s-s u ffix (r), rm packages ?65c to +150c operating tem p erature range op282g, op282a, op482g ?40c to +85c j u nction temperature range p-suffix (n), s-s u ffix (r), rm packages ?65c to +150c lead temperature range (soldering 60 sec) 300c 1 for supp ly vo lt a g e s les s t h a n 18 v, t h e a b so lut e m a x i m u m i n put volt a g e i s eq ua l t o t h e suppl y volt a g e. s t r e s s es a b o v e t h os e lis t e d u n de r a b s o l u t e m a xi m u m r a t i n g s ma y c a us e p e r m a n en t dama ge t o t h e de vice . this is a s t r e s s ra t i n g onl y ; f u n c t i o n al o p era t ion o f t h e de vice a t t h es e o r an y o t h e r con d i t io ns 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 plie d . e x p o sur e t o a b s o l u te max i m u m ra t i ng co ndi t i on s fo r ex ten d e d p e r i o d s ma y a f fe c t de vice r e l i ab i l i t y . table 3. package type ja 1 jc unit 8-lead msop [rm] 206 44 c/w 8-lead soic (s- s uffix) [r] 157 56 c/w 14-lead pdip (p -suffix) [ n ] 83 39 c/w 14-lead soic (s -suffix) [r] 104 36 c/w 1 ja is s p ecif i e d f o r t h e wors t-cas e conditions ; i.e., ja i s spe c i f i e d for d e vi ce i n sock et f o r cer d i p , pd ip; ja i s speci f i e d for devi ce s o l d er e d i n ci rcui t boa r d for soic or m s op p a ckage. esd caution esd (electrostatic discharge) sensitive device. ele c tr ostatic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharg e wit h out detection. althou gh 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.
op282/op482 r e v. f | pa g e 5 of 16 typical perf orm ance cha r acte ristics frequency (hz) open-loop gain (db) 1k ?4 0 ?2 0 60 80 10k 1m 10m 00301-005 100k 20 40 0 v s = 15v t a = 25c ph a se ( d egree) ?45 135 45 90 0 ?90 180 f i g u re 5. o p 2 8 2 o p en-l oop g a in and p h as e v s . f r equenc y temperature (c) open- l oop gain ( v /mv) ?7 5 0 5 35 45 ?25 100 125 00301-006 25 15 25 10 v s = 15v r l = 10k ? 20 30 40 75 50 0 ?5 0 f i g u re 6. o p 2 8 2 o p en-l oop g a in v s . t e mpe r at u r e load capacitance (pf) over sh oot ( % ) 0 0 10 70 80 200 400 500 00301-007 30 50 20 40 60 300 100 v s = 15v r l = 2k ? v in = 100mv p-p a vcl = 1 t a = 25 c +os ?os f i g u re 7. o p 2 8 2 s m al l s i g n a l o v e r s h o o t v s . l oad cap a c i t a nc e frequency (hz) closed-loop gain (db) 1k ?3 0 ?2 0 60 70 10k 1m 10m 00301-008 100k 20 40 0 v s = 15v t a = 25 c ?1 0 50 10 30 a vcl = 1 00 a vcl = 1 0 a vcl = 1 f i g u re 8. o p 2 8 2 cl os ed-l oop g a in v s . f r equ e nc y temperature (c) slew r a t e ( v / s) ?75 0 5 30 ? 2 5 100 125 00301-009 25 15 25 10 v s = 15v r l = 10k ? c l = 50pf 20 75 50 0 ?5 0 ?sr +sr f i gur e 9 . op 28 2 slew r a t e vs . t e m p e r atur e temperature (c) inp u t bias curre nt (pa) ?75 0.1 1000 ? 2 5 100 125 00301-010 25 1 100 10 75 50 0 ?5 0 v s = 15v v cm = 0v f i g u re 10. op 28 2 i n put bias cur r ent v s . t e mpe r at u r e
op282/op482 r e v. f | pa g e 6 of 16 frequency (hz) volta ge n o ise d e n s ity ( n v/ h z ) 10 1 1000 100 10k 00301-011 1k 100 10 v s = 15v t a = 25c f i g u re 11. op 28 2 v o lt ag e n o is e d e ns i t y v s . f r eque nc y common-mode voltage (v) inp u t bias curre nt (pa) ?1 5 0.1 1000 10 15 00301-012 ?5 1 100 10 5 0 ?10 v s = 15v t a = 25c f i g u re 12. op 28 2 i n put bias cur r ent v s . co mm on-m ode v o lt ag e supply voltage (v) s u p p l y curre nt ( a) 0 450 480 20 00301-013 10 455 465 460 1 5 5 t a = 25 c 470 475 f i g u re 13. op 28 2 s u p p ly cu rrent v s . sup p ly v o lt ag e supply voltage (v) output voltage sw ing (v) 0 ?20 20 20 00301-014 10 ?15 ?5 ?10 1 5 5 t a = 25 c r l = 10k ? 0 15 v oh v ol 5 10 f i g u re 14. op 28 2 o u t p ut v o lt ag e swi n g v s . sup p ly v o lt ag e frequency (hz) outp ut imp e dance ( ? ) 1k 0.1 100 1000 10k 1m 100 00301-015 100k 1 10 v s = 15v t a = 25c a vcl = 100 a vcl = 10 a vcl = 1 f i g u re 15. op 28 2 c l os ed-l oop o u t p ut imped a nce v s . f r eq uenc y temperature (c) s u p p l y curre nt ( a) ?50 450 480 125 00301-016 25 455 75 0 460 475 465 470 ? 2 5 5 0 100 f i g u re 16. op 28 2 s u p p ly cu rrent v s . t e mper at ur e
op282/op482 r e v. f | pa g e 7 of 16 load resistance ( ? ) abs olute outp ut v o ltage (v ) 0 6 16 1k 10k 100 00301-017 2 4 v s = 15v t a = 25c v ol v oh 12 8 10 14 f i g u re 17. op 28 2 a b s o lut e o u t p ut v o l t ag e v s . l oad r e s i s t anc e frequency (hz) p s rr (db) 1k ?60 40 140 10k 1m 100 00301-018 100k 0 20 ?40 ?20 60 100 120 80 ?psrr +psrr v s = 15v t a = 25c f i g u re 18. op 28 2 p s r r v s . f r equenc y temperature (c) s h ort-circuit curre nt (ma) ?50 0 14 125 00301-019 25 4 75 0 6 12 8 10 ?25 5 0 100 2 v s = 15v sink source f i g u re 19. op 28 2 s h o r t - cir c u i t cu rren t v s . t e mpe r at u r e frequency (hz) max i mum o u tp ut s w i n g (v p-p) 100 0 5 25 30 1k 100k 1m 00301-020 10k 15 20 10 v s = 15v t a = 25c r l = 10k ? a vcl = 1 f i g u re 20. op 28 2 m a x i m u m o u t p ut swing v s . f r equenc y frequency (hz) cmrr (db) 1k ?60 40 140 10k 1m 100 00301-021 100k 0 20 ?40 ?20 60 100 120 80 v s = 15v t a = 25c f i g u re 21. op 28 2 c m r r v s . f r equenc y v os ( v) units ?2000 0 200 00301-022 ?400 80 ? 1200 120 160 40 400 1200 2000 v s = 15v t a = 25c 300 op282 (600 op amps) 0 f i g u re 22. op 28 2 v os d i s t r i but i on soi c p a ckag e
op282/op482 r e v. f | pa g e 8 of 16 tcv os ( v/ c) units 0 0 400 00301-023 20 80 16 120 160 40 28 32 36 24 200 280 320 360 240 41 2 8 v s = 15v 300 op282 (600 op amps) f i g u re 23. op 28 2 tc v os d i s t r i but i on s o ic p a ckag e frequency (hz) 1k 10k 100k 1m 100m 10m 80 open- l oop gain ( d b) ph a se ( d egrees) 90 135 0 45 180 60 40 20 0 v s = 15v t a = 25c 00301-024 f i g u re 24. op 48 2 o p en-l oop g a in, p h as e v s . f r equenc y 125 100 50 75 25 0 ?75 ? 50 ? 2 5 temperature ( c) open- l oop gain ( v /mv) 30 35 25 20 15 10 5 v s = 15v r l = 10k ? 00301-025 0 f i g u re 25. op 48 2 o p en-l oop g a in ( v / m v ) over sh oot ( % ) 500 0 300 100 200 400 70 10 0 60 50 40 30 20 load capacitance (pf) a vcl = 1 negative edge v s = 15v r l = 2k ? v in = 100mv p-p 00301-026 a vcl = 1 positive edge f i g u re 26. op 48 2 s m a l l sig n al o v e r s h oot v s . l oad cap a c i t a nce frequency (hz) 1k 10k 100k 1m 100m 10m 60 closed- l oop gain ( d b) 40 20 10 0 50 30 ?10 ?20 00301-027 a vcl = 10 a vcl = 1 a vcl = 100 v s = 15v t a = 25c f i g u re 27. op 48 2 c l os ed-l oop g a in v s . f r equ e nc y ?s r ?7 5 temperature (c) ? 5 0 ? 25 0 2 5 5 0 7 5 100 125 5 10 25 15 20 +sr slew r a t e ( v / s) 00301-028 v s = 15v r l = 10k ? c l = 50pf 0 f i g u re 28. op 48 2 s l ew r a te v s . t e m p er at ur e
op282/op482 r e v. f | pa g e 9 of 16 1000 1.0 0.1 100 10 inp u t bias curre nt (pa) temperature (c) 125 ?25 ?50 2 5 0 7 5 100 00301-029 v s = 15v v cm = 0v 05 0 f i g u re 29. op 48 2 i n put bias cur r ent v s . t e mpe r at u r e 60 55 ph a se m a r g in ( d egrees) ?75 temperature (c) ?50 ? 25 0 2 5 5 0 7 5 100 125 v s = 15v r l = 10k ? gbw gain bandwidth p r oduct (mhz) 50 45 40 5.0 4.5 4.0 3.5 3.0 00301-030 f i gur e 30. op 482 p h ase m a r g i n a n d g a i n bandwi dt h p r oduct vs . t e mp er a t ur e frequency (hz) 10 100 1k 10k 80 0 20 10 40 30 50 60 70 v o lta ge nois e de ns ity (nv / hz) 00301-031 v s = 15v t a = 25c f i g u re 31. op 48 2 v o lt ag e n o is e d e ns i t y v s . f r eque nc y common-mode voltage (v) 15 ?1 5 0 5 1 0 ?10 ? 5 inp u t bias curre nt (pa) 100 1 1000 0.1 10 00301-032 v s = 15v t a = 25c f i g u re 32. op 48 2 i n put bias cur r ent v s . co mm on-m ode v o lt ag e supply voltage (v) 15 0 10 5 re lativ e s u p p l y curre nt (is y ) 1.10 0.90 1.15 0.85 1.00 1.05 0.95 2 0 00301-033 t a = 25 c f i g u re 33. op 48 2 r e l a t i ve su p p ly cu rrent v s . sup p ly v o lt ag e su ppl y v o l t a g e (v) 15 0 1 0 5 20 ?5 output voltage sw ing (v) 0 15 5 10 20 ?10 ?20 ?15 00301-034 r l = 10k ? t a = 25c f i g u re 34. op 48 2 o u t p ut v o lt ag e swi n g v s . sup p ly v o lt ag e
op282/op482 rev. f | pag e 10 of 1 6 imp e dance ( ? ) 600 0 300 100 200 500 400 1m 1k 100 100k 10k frequency (hz) a vcl = 10 00301-035 v s = 15v t a = 25c a vcl = 1 a vcl = 100 f i g u re 35. op 48 2 c l os ed-l oop o u t p ut imped a nce v s . f r eq uenc y re lativ e s u p p l y curre nt (is y ) temperature (c) 1.20 0.80 0.90 0.85 1.00 0.95 1.05 1.10 1.15 ?5 0 ?75 125 100 75 50 25 0 ?25 00301-036 v s = 15v f i g u re 36. op 48 2 r e l a t i ve su p p ly cu rrent v s . t e m p er at ure load resistance ( ? ) 10k 1k 100 abs olute outp ut v o ltage (v ) 16 0 2 8 6 10 12 14 4 positive swing negative swing 00301-037 v s = 15v t a = 25c f i g u re 37. op 48 2 m a x i m u m o u t p ut v o lt ag e v s . l oad r e s i s t anc e p s rr (db) 100 20 40 0 20 80 60 1m 1k 100 100k 10k frequency (hz) +psrr 00301-038 v s = 15v ? v = 100mv t a = 25c ? psrr f i g u re 38. op 48 2 p o we r sup p l y r e j e c t ion rat i o ( p sr r ) v s . f r eq uenc y s h or t-circuit curre nt (ma) 20 15 5 10 sink source temperature ( c) 75 ?75 0 25 50 ?50 ? 25 100 125 00301-039 v s = 15v 0 f i g u re 39. op 48 2 s h o r t - cir c u i t cu rren t v s . t e mpe r at u r e max i mum o u tp ut s w ing (v ) 30 0 15 5 10 25 20 100k 10k 1k 1m frequency (hz) 00301-040 v s = 15v t a = 25c a vcl = 1 r l = 10k ? f i g u re 40. op 48 2 m a x i m u m o u t p ut swing v s . f r equenc y
op282/op482 rev. f | pag e 11 of 1 6 cmrr (db) 100 ?2 0 40 0 20 80 60 1m 1k 100 100k 10k frequency (hz) 00301-041 v s = 15v t a = 25 c v cm = 100mv f i g u re 41. op 48 2 com m o n-m o d e r e j e c t ion rat i o (c m r r ) v s . f r equenc y units 0 600 700 300 100 200 400 500 2000 ? 1600 ?2000 1600 1200 800 400 0 ?400 ?800 ?1200 v os ( v) 00301-045 v s = 15v t a = 25c 300 op482 (1200 op amps) f i g u re 42. op 48 2 v os d i s t r i but i on p p a ck ag e units 320 0 80 40 160 120 200 240 280 0 00301-043 32 28 24 12 20 16 8 4 tcv os ( v/c) f i g u re 43. op 48 2 tc v os d i s t r i but i on p p a ck ag e
op282/op482 rev. f | pag e 12 of 1 6 appli c ations inf ormati o n the o p 282 an d o p 482 a r e d u al a nd q u ad jfet o p a m ps tha t a r e o p timized fo r hig h s p eed a t lo w p o w e r . thi s co m b ina t ion mak e s t h es e a m plif iers exce l l en t ch o i ces fo r b a t t e r y -p o w er e d o r lo w p o w e r a p plica t ion s t h a t r e quir e a b o v e a v er ag e p e r f o r ma n c e . a p plica t ion s b e n e f i t i n g f r o m t h is p e r f o r ma n c e co m b in a t ion in cl ud e te le co m m unic a t ion s , ge o p h y sica l explo r a t io n, p o r t a b le m e dica l e q ui pmen t, and na vig a t i o n a l in st r u m e n t a t ion. high-side s i gnal conditioning ther e a r e man y a p plic a t io ns t h a t r e q u ir e t h e s e n s in g o f sig n als n e a r t h e p o si t i ve ra il . o p 282s a nd o p 482s w e re t e s t e d and a r e gua r a n te e d o v er a co mm on- m o d e ra n g e (?11 v v cm +15 v) th a t in c l ud e s t h e posi ti v e su p p ly . on e a p pli c a t ion w h er e t h is is comm on ly us e d is in t h e s e n s in g o f po w e r s u p p l y c u r r en ts. this en a b les i t t o b e us ed in c u rr en t s e n s in g a p plica t i o n s , such as t h e p a r t ia l cir c ui t sh o w n in f i gur e 44. i n t h is c i r c ui t, t h e v o l t a g e dr o p acr o s s a lo w val u e r e sis t o r , s u ch as the 0.1 ? s h own her e , is a m p l if ied and co m p ar ed t o 7.5 v . t h e o u t p u t ca n th en b e used f o r curr e n t l i m i tin g . 15v 100k ? 500k ? 0.1 ? 500k ? 100k ? r l 1/2 op282 00301-046 f i gure 4 4 . hi gh-si d e si gn a l c o ndi t io n i ng phase i n ve rsion m o s t jfet -in p ut a m plif iers in v e r t t h e phas e o f t h e i n p u t sig n al if ei t h er i n p u t e x ce e d s t h e i n p u t co mm o n - m o d e ra n g e . f o r t h e o p 282/o p 482, n e g a ti ve sig n als in exces s o f a p p r o x ima t e l y 14 v ca us e phas e i n versio n. the c a us e o f t h is ef fe c t is s a t u r a t i o n o f t h e in p u t s t a g e l e adin g t o t h e for w a r d-b i asi n g of a dra i n-ga te dio d e . a sim p le f i x fo r t h is in n o ni n v er t i n g a p pli c a t ion s is t o place a r e sis t o r i n s e r i es w i t h t h e n o nin v er t i n g i n p u t. this limi t s t h e am o u n t o f c u r r en t t h r o ug h t h e fo r w a r d- b i as e d dio d e and p r e v en ts t h e sh u t t i n g do w n o f t h e o u t p ut s t a g e. f o r t h e o p 282/o p 482, a val u e o f 200 k? has been f o u nd t o w o rk; h o w e v e r , t h is ad ds a sig n if ic a n t a m o u n t o f n o is e . ?15 ? 10 ?5 5 1 0 1 5 15 10 5 0 ? 5 ? 10 ? 15 v in v out 00301-047 0 f i g u re 45. op 28 2 phas e r e ve rs a l active fil t ers the wide b a n d wid t h and hig h s l ew r a t e s o f the o p 282/o p 482 mak e ei t h er an exce l l en t ch o i ce fo r ma n y f i l t er a p plic a t ion s . ther e a r e man y ac t i v e f i l t er co nf igura t io n s , b u t t h e fo ur m o s t p o p u l a r c o n f i g u r a t i o n s a r e b u t t e r w o r t h , e l l i p t i c a l , b e s s e l , a n d c h eb y s h e v . e a ch ty p e has a r e sp o n s e t h a t is o p t i mi ze d fo r a g i ven cha r ac ter i st ic as sh o w n i n t a b l e 4. table 4. t y p e s e l e c t i v i t y o v e r s h o o t p h a s e amplit ude (pas s band) amplitude (stop band) b u t t e r w o r t h m o d e r a t e g o o d max i m u m f l a t c h e b y s h e v g o o d m o d e r a t e nonlinea r e q u a l r i p p l e elliptica l best poor equal ripple equal ripple besse l ( t homps o n) poor best linear
op282/op482 rev. f | pag e 13 of 1 6 programm able state - variable filter t h e c i rc u i t s h o w n i n fi g u re 4 6 c a n b e u s e d to a c c u r a tely p r ogra m th e q , th e cu t o f f f r eq ue n c y f c , a nd ga i n o f a 2-p o le s t a t e va r i ab le f i l t er . o p 482s ha v e been us e d in t h is desig n b e ca us e o f t h eir hig h b a ndwi d t h s, lo w p o w e r , a nd lo w n o is e. this cir c ui t t a k e s o n l y t h r e e p a cka g es t o b u i l d b e ca us e o f t h e q u ad co nf igura t io n o f t h e o p am ps an d d a cs. the d a c s sh o w n a r e us e d i n t h e v o l t a g e m o de; t h er efo r e , ma n y val u es a r e dep e n d e n t on t h e ac c u rac y o f t h e d a c o n l y a nd n o t o n t h e a b s o l u t e val u es o f t h e d a c s r e sis t i v e ladders. this ma k e s this cir c ui t un usual l y acc u ra t e fo r a p r og ra mma b l e f i l t er . a d j u s t in g d a c 1 c h a n g e s the sig n al a m p l i t ude acr o s s r1; t h er efo r e , t h e d a c a t t e n u a t io n t i m e s r1 deter m i n es t h e am o u n t o f sig n al c u r r en t tha t c h a r g e s t h e in teg r a t in g c a p a ci t o r , c1. this c u t o ff fr e q u e n c y c a n n o w be e x p r e s s e d a s ? ? ? ? ? ? = 256 2 1 d1 r1c1 fc w h er e d1 is t h e dig i t a l co de fo r t h e d a c. th e ga in o f t h is ci r c ui t is set b y ad j u s t in g d3 . t h e g a i n eq ua ti o n i s ? ? ? ? ? ? = 256 d3 r5 r4 gain d a c 2 is us e d to s et t h e q o f t h e cir c ui t. a d j u s t in g t h is d a c c o n t ro l s t h e a m ou n t of f e e d b a c k f rom t h e b a nd - p a s s no d e to t h e i n p u t s u mmin g n o de . n o t e t h a t t h e dig i t a l v a l u e o f t h e d a c is i n t h e n u m e ra t o r ; t h er e f o r e , zer o co de is n o t a vali d o p e r a t in g po in t . ? ? ? ? ? ? = d2 r3 r2 q 256 r5 2k ? 1/4 op482 v in 1/4 dac 8408 high pass c1 1000pf r4 2k ? r6 2k ? r7 2k ? 1/4 op482 r1 2k ? 1/4 op482 1/4 dac 8408 1/4 op482 r1 2k ? 1/4 op482 1/4 dac 8408 1/4 op482 c1 1000pf low pass 1/4 op482 1/4 op482 1/4 dac 8408 band pass r2 2k ? r3 2k ? 00301- 048 f i g u re 46.
op282/op482 rev. f | pag e 14 of 1 6 outline dimensions 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5 . 00 ( 0 . 196 8) 4 . 80 ( 0 . 189 0) 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 47. 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 -body s-suf f ix (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) 0.80 0.60 0.40 8 0 4 8 1 5 4.90 bsc pin 1 0.65 bsc 3.00 bsc seating plane 0.15 0.00 0.38 0.22 1.10 max 3.00 bsc coplanarity 0.10 0.23 0.08 compliant to jedec standards mo-187aa f i g u re 48. 8-l e ad m i ni s m al l o u t l ine p a ck ag e [m sop ] (rm-8) di me nsio ns sho w n i n mi ll im e t e r s
op282/op482 rev. f | pag e 15 of 1 6 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 coplanarit y 0.10 14 8 7 1 6.20 (0.2441) 5.80 (0.2283) 4.00 (0.1575) 3.80 (0.1496) 8.75 (0.3445) 8.55 (0.3366) 1.27 (0.0500) bsc seating plane 0.25 (0.0098) 0.10 (0.0039) 0.51 (0.0201) 0.31 (0.0122) 1.75 (0.0689) 1.35 (0.0531) 8 0 0.50 (0.0197) 0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.0067) compliant to jedec standards ms-012ab 45 f i gure 49. 14-l ead standar d s m all o u tline p a ck age [s oi c ] nar r o w -body s-suf f ix (r-14) di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s) 14 17 8 0. 685 ( 17. 40) 0. 665 ( 16. 89) 0. 645 ( 16. 38) 0.295 (7.49) 0.285 (7.24) 0.275 (6.99) 0.100 (2.54) bsc seating plane 0.180 (4.57) max 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0. 06 0 ( 1 . 52) 0. 05 0 ( 1 . 27) 0. 04 5 ( 1 . 14) 0.015 (0.38) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.015 (0.38) min 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design compliant to jedec standards mo-095-ab f i g u re 50. 1 4 -l ead p l as t i c d u al- i n-li n e p a ckag e [ p di p ] p - suffi x (n- 1 4 ) di me nsio n sho w n in i n c h e s a n d ( m il lim e t e r s)
op282/op482 rev. f | pag e 16 of 1 6 ordering guide model temperature r a nge package desc ri p t i o n p a c k a g e o p t i o n b r a n d i n g op282armz-r2 1 ?40c to +85c 8-lead msop rm-8 a0b op282armz-re el 1 ?40c to +85c 8-lead msop rm-8 a0b op282gs ?40c to +85c 8-lead soic s-suffix (r-8 ) op282gs-reel ?40c to +85c 8-lead soic s-suffix (r-8 ) op282gs-reel7 ?40c to +85c 8-lead soic s-suffix (r-8 ) op282gsz 1 ?40c to +85c 8-lead soic s-suffix (r-8 ) op282gsz-reel 1 ?40c to +85c 8-lead soic s-suffix (r-8 ) op282gsz-reel 7 1 ?40c to +85c 8-lead soic s-suffix (r-8 ) op482gp ?40c to +85c 14-lead pdip p-suffix (n-14 ) op482gs ?40c to +85c 14-lead soic s-suffix (r-14 ) op482gs-reel ?40c to +85c 14-lead soic s-suffix (r-14 ) op482gs-reel7 ?40c to +85c 14-lead soic s-suffix (r-14 ) op482gsz 1 ?40c to +85c 14-lead soic s-suffix (r-14 ) op482gsz-reel 1 ?40c to +85c 14-lead soic s-suffix (r-14 ) op482gsz-reel 7 1 ?40c to +85c 14-lead soic s-suffix (r-14 ) 1 z = pb-free part. ? 2004 analo g de vices, inc. all rights reserve d . tra d em arks and registered tra d ema r ks are the prop erty of their respective owners . c00301C0 C 10/04(f)

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