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precision, very low noise, low input bias current operational amplifiers ad8671/ad8672/ad8674 rev. b 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 very low noise: 2.8 nv/ hz , 77 n v p-p wide bandwi dt h: 10 mhz low input bias current: 12 n a max low offset voltage: 75 v max high open-loop gain: 120 db min low supply current: 3 ma per amplifier dual -supply o p eratio n: 5 v t o 15 v unity gain st able no phase rever s al applic ati o ns pll filters filters for gps instrumentation sensors and controls professional q u ality audio general description the ad8671/ad8672/ad8674 a r e v e r y hig h p r ecisio n a m plif iers fe a t u r in g v e r y lo w no is e , v e r y lo w o f fs et v o l t a g e and dr if t, lo w in p u t b i as c u r r en t, 10 mh z b a n d wi d t h, a nd lo w p o w e r co n s um p t io n. o u t p u t s a r e s t ab l e wi th ca p a c i ti ve lo ads o f o v er 1000 pf . s u p p l y c u r r en t is les s tha n 3 ma p e r am p l if ier a t 30 v . the ad8671 s c o m b ina t ion o f u l tralo w n o is e , hig h p r ecision, sp e e d, and st ab i l i t y is u n m a tc he d, w h i l e t h e m s op ve rs ion re qu i r e s on ly h a l f t h e b o ard sp a c e of c o m p ar abl e am pl i f i e rs . a p plica t ion s fo r t h es e am plif iers in cl ud e hig h qua l i t y pll f i l t ers, p r e c isio n f i l t ers, m e d i ca l a nd a n a l y t i c a l i n st r u m e n t a t io n, p r e c isio n p o w e r su p p ly co n t r o ls, a t e, d a t a a c q u isi t io n, and p r ecisio n co n t rols as w e l l as p r o f es sio n al q u ali t y a u dio . the ad8671/ad8672/ad8674 a r e s p ecif ie d o v er th e ext e n d ed ind u s t r i al (C40 c t o +125c) t e m p er a t ur e ra n g e . the ad8671/ad8672 a r e a v ail a b l e in t h e 8 - lead so i c and 8-lead mso p p a c k a g es. the ad8674 is a v ailab l e in 14 -lead so i c an d 14-le ad t sso p p a c k a g es. s u r f ace-m o u n t de vices i n msop p a cka g es a r e a v a i lab l e in t a p e a nd r e el on ly . pin c o nfig uratio ns nc = no connect nc 1 ? in 2 + in 3 v? 4 nc v+ out nc 8 7 6 5 03718-b - 001 ad8671 top view (not to scale) nc = no connect nc 1 ? in 2 + in 3 v? 4 nc v+ out nc 8 7 6 5 03718-b - 002 ad8671 top view (not to scale) f i g u re 1. 8-l e ad so ic (r suf f i x ) f i g u re 2. 8-l e ad m s op (r m suf f i x ) out a 1 ?in a 2 +in a 3 v? 4 v+ out b ?in b +in b 8 7 6 5 03718-b - 003 ad8672 top view (not to scale) out a 1 ? in a 2 +in a 3 v? 4 v+ out b ?in b +in b 8 7 6 5 03718-b - 004 ad8672 top view (not to scale) f i g u re 3. 8-l e ad so ic (r suf f i x ) f i g u re 4. 8-l e ad m s op (r m suf f i x ) out a 1 ?in a 2 +in a 3 v+ 4 +in b 5 ?in b 6 out b 7 out d ?in d +in d v? 14 13 12 11 +in c ?in c out c 10 9 8 03718-b - 005 ad8674 top view (not to scale) out a 1 ?in a 2 +in a 3 v+ 4 ?in b 5 +in b 6 out b 7 out d ?in d +in d v? 14 13 12 11 +in c ?in c out c 10 9 8 03718-b - 006 ad8674 top view (not to scale) f i g u re 5. 14-l e ad s o ic (r suf f i x ) f i g u re 6. 14-l e ad t ssop (ru suf f i x )
ad8671/ad8672/ad8674 rev. b | page 2 of 16 table of contents specifications ..................................................................................... 3 electrical characteristics, 5.0 v ................................................ 3 electrical characteristics, 15 v ................................................. 4 absolute maximum ratings ............................................................ 5 typical performance characteristics ............................................. 6 applications ..................................................................................... 11 unity gain follower applications ............................................ 11 output phase reversal ............................................................... 11 tot a l noi s e v s . s ou rc e r e s i st a n c e ............................................. 11 thd + noise ............................................................................... 12 driving capacitive loads .......................................................... 12 gps receiver ............................................................................... 13 band-pass filter .......................................................................... 13 pll synthesizers and loop filters ........................................... 13 outline dimensions ....................................................................... 14 ordering guide ............................................................................... 16 revision history 4/04data sheet changed from rev. a to rev. b changes to figure 32.................................................................. 11 changes to figures 36, 37, and 38............................................. 12 1/04data sheet changed from rev. 0 to rev. a added ad8672 and ad8674 parts ..............................universal changes to specifications ............................................................ 3 deleted figure 3............................................................................ 6 changes to figures 7, 8, and 9..................................................... 6 changes to figure 37.................................................................. 12 added new figure 32 ................................................................. 10
ad8671/ad8672/ad8674 rev. b | page 3 of 16 specifications electrical characteristics, 5.0 v table 1. v s = 5.0 v, v cm = 0 v, t a = 25c, unless otherwise noted parameter symbol conditions min typ max unit input characteristics offset voltage v os 20 75 v C40c < t a < +125c 30 125 v offset voltage drift ?v os /?t C40c < t a < +125c ad8671 0.3 0.5 v/c ad8672/ad8674 0.3 0.8 v/c input bias current i b C12 +3 +12 na +25c < t a < +125c C20 +5 +20 na C40c < t a < +125c C40 +8 +40 na input offset current i os C12 +6 +12 na +25c < t a < +125c C20 +6 +20 na C40c < t a < +125c C40 +8 +40 na input voltage range C2.5 +2.5 v common-mode rejection ratio cmrr v cm = C2.5 v to +2.5 v 100 120 db large signal voltage gain a vo r l = 2 k?, v o = C3 v to +3 v 1000 6000 v/mv input capacitance, common mode c incm 6.25 pf input capacitance, differential mode c indm 7.5 pf input resistance, common mode r in 3.5 g? input resistance, differential mode r indm 15 m? output characteristics output voltage high v oh r l = 2 k?, C40c to +125c +3.8 +4.0 v output voltage low v ol r l = 2 k?, C40c to +125c C3.9 C3.8 v output voltage high v oh r l = 600 ? +3.7 +3.9 v output voltage low v ol r l = 600 ? C3.8 C3.7 v output current i out 10 ma power supply power supply rejection ratio psrr v s = 4 v to 18 v ad8671/ad8672 110 130 db ad8674 106 115 db supply current/amplifier i sy v o = 0 v 3 3.5 ma C40c ad8671/ad8672/ad8674 rev. b | page 4 of 16 electrical characteristics, 15 v table 2. v s = 15 v, v cm = 0 v, t a = 25c, unless otherwise noted parameter symbol conditions min typ max unit input characteristics offset voltage v os 20 75 v C40c < t a < +125c 30 125 v offset voltage drift ?v os /?t C40c < t a < +125c ad8671 0.3 0.5 v/c ad8672/ad8674 0.3 0.8 v/c input bias current i b C12 +3 +12 na +25c < t a < +125c C20 +5 +20 na C40c < t a < +125c C40 +8 +40 na input offset current i os C12 +6 +12 na +25c < t a < +125c C20 +6 +20 na C40c < t a < +125c C40 +8 +40 na input voltage range C12 +12 v common-mode rejection ratio cmrr v cm = C12 v to +12 v 100 120 db large signal voltage gain a vo r l = 2 k?, v o = C10 v to +10 v 1000 6000 v/mv input capacitance, common mode c incm 6.25 pf input capacitance, differential mode c indm 7.5 pf input resistance, common mode r in 3.5 g? input resistance, differential mode r indm 15 m? output characteristics output voltage high v oh r l = 2 k?, C40c to +125c +13.2 +13.8 v output voltage low v ol r l = 2 k?, C40c to +125c C13.8 C13.2 v output voltage high v oh r l = 600 ? +11 +12.3 v output voltage low v ol r l = 600 ? C12.4 C11 v output current i out 20 ma short circuit current i sc 30 ma power supply power supply rejection ratio psrr v s = 4 v to 18 v ad8671/ad8672 110 130 db ad8674 106 115 db supply current/amplifier i sy v o = 0 v 3 3.5 ma C40c ad8671/ad8672/ad 8674 r e v. b | pa ge 5 o f 1 6 absolute maximum ratings table 3. ad86 71/ad8672/a d 8674 stress r a tings 1 p a r a m e t e r r a t i n g supply voltage 36 v input voltage v s C to v s + differential input voltage 0.7 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 all package s C65c to +150c operating tem p erature range all package s C40c to +125c j u nction temperature range all package s C65c to +150c lead temperature range (soldering, 60 sec) 300c 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 . 1 a b sol u te maximum ratings appl y at 25c , unle ss o the rwis e no ted . table 4. packa g e characteristics package type ja 2 jc unit 8-lead msop (rm) 190 44 c/w 8-lead soic (r) 158 43 c/w 14-lead soic (r) 120 36 c/w 14-lead tssop (ru) 180 35 c/w 2 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 sol d er ed i n ci rcui t boa r d for sur f a c e- m o un t pa cka g es. esd caution 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 wi thout detection. although this product features proprietary esd protection circu i try, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. theref ore, prop er esd precautions a r e recommended to avoid perform a nce degradation or l o ss of functiona l ity.
ad8671/ad8672/ad 8674 r e v. b | pa ge 6 o f 1 6 typical perf orm ance cha r acte ristics 03718-b - 007 frequency (hz) volta ge n o ise d e n s ity ( n v/ h z ) 4 8 12 16 20 24 28 32 0 0 1 02 03 04 05 06 07 0 8 09 0 1 0 0 v s = 15v f i g u re 7. v o lt ag e n o is e d e ns it y v s . f r e q uenc y 03718-b - 008 frequency (khz) volta ge n o ise d e n s ity ( n v/ h z ) 0 4.5 9.0 13.5 18.0 22.5 27.0 31.5 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 v s = 15v f i g u re 8. v o lt ag e n o is e d e ns it y v s . f r e q uenc y 03718-b - 009 frequency (khz) volta ge n o ise d e n s ity ( n v/ h z ) 0 11 0 23456 789 0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 v s = 15v f i g u re 9. v o lt ag e n o is e d e ns it y v s . f r e q uenc y 0 5 10 15 20 25 30 35 40 45 ?35 v os ( v) n u m b er o f a m pl i f i e r s ?2 5 ? 5 ?15 0 45 ?30 ? 20 ?10 5 10 15 20 25 30 35 40 03718-b -010 v s = 5v t a = 25c f i gure 10. input o f f s et v o ltag e d i strib u tion 0 5 10 15 20 25 30 35 ?3 5 v os ( v) nu m b e r o f am p l i f i e r s ?2 5 ? 5 ?1 5 0 5 0 ? 3 0 ? 20 ? 1 0 5 10 15 20 25 30 35 40 03718-b - 011 45 v s = 15v t a = 25c f i gure 11. input o f f s et v o ltag e d i strib u tion 6 7 8 9 10 11 12 13 14 15 16 v os ( v) temperature ( c) ?40 8 5 25 125 03718-b - 012 v s = 15v v s = 5v f i gure 12. input o f f s et v o ltag e v s . t e m p er atu r e
ad8671/ad8672/ad 8674 r e v. b | pa ge 7 o f 1 6 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 i b (na) temperature ( c) ?40 8 5 25 125 +i b ?i b 03718-b - 013 v s = 5 v f i gure 13. input b i a s current v s . t e mpe r ature ? 1.0 ? 0.5 0 0.5 1.0 1.5 2.0 2.5 i b (na) temperature ( c) ?40 8 5 25 125 +i b ?i b 03718-b - 014 v s = 15v f i gure 14. input b i a s current v s . t e mpe r ature 2.4 2.6 2.8 3.0 3.2 3.4 i sy (ma) 3.6 3.8 4.0 temperature ( c) ?40 8 5 25 125 v s = 15v v s = 5 v 03718-b - 015 f i gure 15. sup p l y current v s . t e mper at ur e 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 output voltage (v) temperature ( c) ?40 8 5 25 125 r l = 600 ? r l = 2k ? 03718-b - 016 v s = 15v f i gure 1 6 . o u tput v o l t a g e h i gh vs . t e m p er a t u r e ?14.5 ?14.0 ?13.5 ?13.0 ?12.5 ?12.0 ?11.5 ?11.0 output voltage (v) temperature ( c) ?40 8 5 25 125 r l = 600 ? r l = 2k ? 03718-b - 017 v s = 15v f i gure 17. o u tput v o ltag e l o w v s . t e m p er atu r e frequency (hz) op e n - l oop ga i n ( d b ) ?1 0 0 10 100k 03718-b - 018 10m 1m ?4 0 ?3 0 ?2 0 20 30 40 50 v sy = 15v r l = 10k ? c l = 20pf m = 59 gain phase o pen -l o o p ph a s e (d b ) ?45 45 ?180 ?135 ?90 90 135 180 225 0 60 270 f i gure 18. o p en-l oop g a in and phase shif t vs . f r equ e nc y
ad8671/ad8672/ad 8674 r e v. b | pa ge 8 o f 1 6 0 5000 10000 15000 20000 25000 30000 a vo ( v /mv) temperature ( c) ?4 0 8 5 25 125 5 v 15v 03718-b - 019 f i gure 19. o p en-l o o p g a in v s . t e mper atur e frequency (hz) 1k 1m c l os e d - l oo p ga in ( d b ) ?10 0 10 20 40 50 100k 10k 10m 03718-b - 020 30 ?20 ?30 ?40 ?50 100m a v = 100 a v = 10 a v = 1 v sy = 15v v in = 10mv r l = c l = 20pf f i g u re 20. cl os ed-l oop g a in v s . f r equ e nc y frequency (hz) 1k 10m i m p e da nce ( ? ) 40 50 60 70 90 100 100k 10k 100m 03718-b - 021 80 30 20 10 0 a vo = 100 100 a vo = 10 a vo = 1 1m f i gure 21. o u tput imped a nce v s . f r eq uenc y v sy = 15v v in = 4v r l = 2k ? 03718-b -022 volta ge ( 1 v/d i v) time (100 s/div) f i g u re 22. lar g e s i g n al t r ans i ent r e s p ons e v sy = 15v v in = 200mv p-p r l = 2k ? 03718-b - 023 volta ge ( 50mv/d i v) time (10 s/div) f i g u re 23. sm a ll s i g n al t r ans i ent r e s p ons e capacitance (pf) 1k s m a l l s i g n a l ov e r s h oot ( % ) +o s 0 10 20 30 40 50 60 100 10k ?o s 03718-b - 024 v s = 1 5 f i g u re 24. sm a ll s i g n al o v ers h oot v s . l oad cap a c i t a n c e
ad8671/ad8672/ad 8674 r e v. b | pa ge 9 o f 1 6 v in v out 0v v s = 15v v in = 200mv p-p a v = ? 100 r l = 10k ? 0v 03718-b - 025 volta ge ( 200mv/d i v) time (4 s/div) f i gure 25. p o sit i ve o v er dr ive r e c o ver y v in v out v sy = 15v v in = 200mv p-p a v = ? 100 r l = 10k ? 0v 0v 03718-b - 026 volta ge ( 200mv/d i v) time (4 s/div) f i gure 26. neg a tive o v er d r ive r e c o ve r y frequency (hz) 1k 1m cm rr ( d b ) 40 60 80 100 140 160 100k 10k 10m 03718-b - 027 120 20 0 ?20 ?40 100m v sy = 15v 100 10 fi g u r e 2 7 . c m r r v s . fr e q u e n c y frequency ( h z ) 1k 1m p s r r ( d b) 40 60 80 100 140 160 100k 10k 10m 03718-b - 028 120 20 0 ?20 ?40 v sy = 15v 100 ?psrr +psrr 10 fi g u r e 2 8 . p s r r v s . fr e q u e n c y 127 128 129 130 131 132 p s rr (db) 133 134 135 temperature ( c) ?40 8 5 25 125 03718-b - 029 v s = 2.5v to 18v f i g u re 29. psr r v s . t e m p er at ure 03718-b - 030 v s = 15v time (1 s/div) volta ge n o ise ( 50nv/d i v) f i g u re 30. 0. 1 h z t o 10 h z input v o lt ag e n o is e
ad8671/ad8672/ad 8674 rev. b | page 10 of 16 frequency (hz) channe l s e p aration (db) 100 ? 120 ?40 ?20 0 1k 10k 100k 1m ?60 ? 140 ?80 ? 100 10m 100m 03718-b - 031 v s = 15v, 5v f i g u re 31. cha nne l s e pa r a t i on
ad8671/ad8672/ad 8674 rev. b | page 11 of 16 appli c ations unity gain f o llower applications w h en l a rg e t r a n sien t p u ls es (> 1 v) a r e a p plie d a t t h e p o si t i v e t e r m inal o f a m plif iers (s uc h as th e o p 27, l t 100 7, o p a227, a n d ad8671) wi th b a c k -t o - back dio d es a t t h e in p u t s t a g e , t h e us e o f a r e sisto r in t h e fe e d b a ck lo o p is r e co mm e nde d to a v o i d h a ving t h e am plif ier lo ad t h e sig n al g e n e ra t o r . th e fe e d b a ck r e sis t o r , r f , s h o u ld b e a t leas t 500 ?. h o w e v e r , if la rg e val u es m u s t be us e d fo r r f , a s m a l l c a p a c i t o r , c f , s h o u ld be in se r t e d in pa ralle l wi th r f t o co m p e n s a t e f o r th e po le in tr od uce d b y th e i n p u t ca p a c i tan c e an d r f . f i g u re 3 2 show s t h e u n c o m p e n s a te d output re s p ons e w i t h a 10 k? r e sis t o r in t h e fe e d b a ck and t h e co m p en s a t e d r e s p o n s e wi t h c f = 15 pf . 03718-b - 032 r e f 1 + o ver 2 3 . 23% ch2 + o v e r 7 . 885% v o l t a g e (1 v/ d i v) o u t p ut un co m p e n s a t e d ou tp u t co m p e n s a t e d time ( 1 0 0 ns /d iv ) f i gur e 3 2 . t r a n sient o u tput resp o n se output phase reversal phas e r e vers a l is a cha n ge o f p o la r i ty i n t h e am plif ier t r a n sfer fun c ti o n th a t occur s wh en th e in p u t v o l t a g e e x ceed s th e s u p p l y v o l t a g e . th e ad8671/ad8672 /ad8674 do n o t exhi b i t p h as e r e v e r s al ev en w h en th e in p u t v o l t a g e i s 1 v b e y o n d th e s u p p l i es . v sy = 15v v in v ou t 03718-b - 033 time (1 0 s/ di v ) vo l t a g e ( 1 v / d i v) f i g u re 33. o u t p ut phas e r e ve rs a l total nois e vs. source resistance the lo w in p u t vol t a g e n o is e o f t h e ad8671 ma k e s i t a g r e a t ch o i ce fo r a p pli c a t ion s wi t h lo w s o ur ce r e sist an ce . h o we v e r , be ca us e t h e ad8671 has lo w in p u t c u r r en t n o is e , i t can als o b e us ed in c i r c ui ts wi t h s u bs t a n t ial s o ur ce r e sis t a n ce . f i g u re 3 4 show s t h e vol t age noi s e, c u r r e n t noi s e, t h e r ma l noi s e, a nd t o ta l r m s no is e o f th e ad8 671 as a f u n c tion o f th e s o ur ce re s i st anc e . fo r r s < 475 ?, th e in p u t v o l t a g e n o is e , e n , do mi na tes. f o r 475 ? < r s < 412 k?, th er mal n o is e do mina t e s. fo r r s > 412 k? , th e in p u t c u r r en t n o is e domina t e s. 10 1k total noise (nv/ hz) 1 10 100 1000 100 10k 03718-b - 034 100k 1m e n_ t c a b e n i n (4k r s t) 1/ 2 s o u rce re s i s t ance ( ? ) f i gure 34. no ise v s . s o u r c e r e sistance
ad8671/ad8672/ad 8674 rev. b | page 12 of 16 thd + n o is e the ad8671/ad8672/ad8674 exhi b i t lo w t o ta l ha r m o n ic d i stor t i on ove r t h e e n t i re a u d i o f r e q u e nc y r a nge . t h i s m a ke s t h e m sui t a b le for a p plic a t io n s w i t h hig h clos e d - l o o p ga in s, in cl u d in g a u dio a p plic a t io ns. f i gur e 35 sh o w s a p p r o x ima t e l y 0.0006% o f th d + n in a p o si t i v e uni t y ga in, t h e w o rst-c a s e co nf igur a t io n fo r disto r t i o n . hz 100 1k 10k p e rce ntage lt1007 0.0001 0.0002 0.0005 0.0010 0.0020 0.0050 0.0100 0.0200 0.0500 0.1000 50 20 500 200 5k 2k ad8671 20k 03718-b - 035 v s = 5v v in = 2.5v r l = 600 ? f i gure 35. t o t a l h a rm oni c n o is e a n d d i s t o r ti on driving capacitive loads the ad8671/ad8672/ad8674 ca n dr i v e la rg e ca p a c i ti v e lo ads wi t h o u t c a usin g in st ab i l i t y . h o we v e r , w h en conf igur e d in u n i t y ga in, dr i v in g v e r y la rge lo ads ca n c a us e u n wan t e d r i n g in g o r in st ab i l i t y . f i gur e 36 s h o w s th e o u t p u t o f th e ad8671 wi t h a c a p a ci ti v e lo ad o f 1 nf . i f h e a v ier lo ads a r e t o be us e d in lo w c l os ed-lo o p ga in o r uni t y ga in co nf igura t ion s , i t is r e co m m en d e d t o us e ext e r n al co m p en s a tion as sh own in t h e c i r c ui t in f i gur e 37. this t e chniq u e r e d u c e s t h e o v ers h o o t a nd p r e v e n ts t h e o p a m p f r o m os ci l l a t ion. t h e t r ade-o f f o f t h is cir c ui t is a r e d u c t io n i n o u t p u t swi n g. h o we ver , a g r e a t ad de d b e n e f i t st e m s f r o m t h e fac t t h a t t h e i n p u t sig n al a nd t h e o p am p s n o is e a r e f i l t ere d , an d t h us t h e ove r a l l output n o i s e i s ke pt to a m i n i m u m . t h e output re s p ons e of t h e c i rc u i t i s s h ow n i n f i g u re 3 8 . 03718-b - 036 v sy = 15v r l = 2 k ? c l = 1 n f v in = 100 mv a v = +1 ch 2 + o v e r 39. 80% ch 2 ? o v e r 39. 80% tim e ( 1 0 s/ di v ) vo l t a g e ( 5 0 0 m v / d i v ) f i g u re 36. cap a c i t i ve l oad d r ive 500 ? r f v cc 220pf c f v in v ee r g 500 ? 10 ? r s 1nf c l 03718-b - 037 2k ? r l f i gure 37. r e c o m m e nded capa cit i ve l oad c i r c u i t 03718-b - 038 v sy = 15v r l = 2 k ? c l = 1 n f c f = 220 p f v in = 100 mv a v = +2 ch2 +over 5.051% ch2 ? over 6.061% ti m e ( 1 0 s/ d i v ) v o l t ag e ( 100mv / di v ) f i g u re 38. co mpe n s a ted l o ad d r ive
ad8671/ad8672/ad 8674 rev. b | page 13 of 16 ad8671 band-pass filter low noise op amp mixer demodulator low-pass filter vga adc ad10200 ad831 ad8671 ad630 ad8610 ad8369 code generator 03718-b - 039 f i gure 39. si mpl i fi e d bl ock d i agr a m of a g p s r eceive r gps receiver gps r e cei v ers r e q u ir e lo w n o is e t o mini mi ze r f ef fe c t s. th e p r ecisio n o f th e ad8671 ma k e s i t an exce l l en t ch o i ce f o r s u c h a p plic a t ion s . i t s ver y lo w n o is e and w i de b a ndwi d t h ma k e i t su i t abl e for b a nd-p a ss and l o w- p a ss f i l t e r s wi t h ou t t h e p e na lty o f hig h p o w e r co n s um p t io n. f i gur e 39 sh o w s a sim p lif i e d b l o c k d i a g ram o f a gps r e cei v er . the n e x t s e c t ion det a i l s t h e desig n e q ua t i o n s. band-pass filter f i l t ers a r e us ef u l in man y a p plic a t io n s ; fo r exa m ple , b a nd-p a s s f i l t ers a r e us e d in gps sys t e m s, as dis c us s e d in t h e p r e v io us s e c t io n. f i gur e 40 sh o w s a s e cond-o r der b a nd- p a ss krc f i l t er . 18k ? 10k ? 2.25k ? r3 r b r a v cc v ee 2.25k ? r2 2.25k ? r1 1nf c2 v in 1nf c2 03718-b - 040 f i g u re 40. ba nd-p a s s kr c f ilt er t h e eq ual co m p o n en t t o po l o g y yi e l d s a cen t e r f r eq ue n c y rc fo = 2 2 a nd k q ? = 4 2 w h er e: a b r r k + = 1 t h e b a n d - p a s s re sp ons e i s s h ow n i n fi g u re 4 1 . hz 100k 1k 100 10k 1m 03718-b -041 10m v s = 15v 200 v/d i v f i gur e 4 1 . band-p ass resp o n se pll synthesizers and loop f i lters p h as e-lo ck lo o p f i l t ers a r e us e d in am/fm m o d u la t i on. l o o p f i l t ers in pll desig n r e q u ir e acc u rac y a n d ca r e in t h eir im p l em en ta tio n . th e ad8671 /ad8672/ad86 74 a r e ideal can d i d a t es fo r such f i l t er desig n ; t h e lo w o f fs et v o l t a g e and lo w i n p u t b i a s cu rr e n t m i n i m i z e th e o u t p u t e r r o r . i n a d d i ti o n t o th e exce l l en t dc s p e c if ica t ion s , th e ad8671/ad86 72/ad8674 ha ve a uniq ue p e r f o r ma nce a t hig h f r eq uen c ies; t h e hig h o p en-lo o p ga in and w i de b a ndwid t h a l lo w t h e us er to desi g n a f i l t er wi t h a hig h clos e d -lo o p ga in if desira ble . t o o p t i m i ze t h e f i l t er desig n , i t is r e co m m e nde d to us e sma l l va l u e r e sisto r s to minim i z e t h e t h er mal n o is e . a sim p le exam ple is s h o w n in f i gur e 42. 10k ? r1 v cc v ee 1nf 03718-b - 042 vco c1 charge pump phase detector in d f i g u re 42. pll f i lte r si mpl i f i ed bl ock d i ag r a m
ad8671/ad8672/ad 8674 rev. b | page 14 of 16 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 . 1 968) 4 . 80 ( 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 43. 8-l e ad s t anda r d s m a l l o u t l ine p a ckag e [soic ] (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 85 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 44. 8-l e ad m i cro s m al l o u t l in e p a ckag e [m s o p ] (rm-8) di me nsio ns sho w n i n mi ll im e t e r s
ad8671/ad8672/ad 8674 rev. b | page 15 of 16 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 coplanarity 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 u 45 f i gure 45. 14-l ead standar d s m all o u tline p a ck age [s oi c ] (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) 4.50 4.40 4.30 14 8 7 1 6.40 bsc pin 1 5.10 5.00 4.90 0.65 bsc seating plane 0.15 0.05 0.30 0.19 1.20 max 1.05 1.00 0.80 0.20 0.09 8 0 0.75 0.60 0.45 coplanarity 0.10 compliant to jedec standards mo-153ab-1 f i gure 46. 1 4 -l ead thin shr i nk s m a l l o u tline p a ckage [ t ssop ] (ru - 14) di me nsio ns sho w n i n mi ll im e t e r s
ad8671/ad8672/ad 8674 rev. b | page 16 of 16 orderi ng 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 ad8671ar C40c to +125c 8-lead soic r-8 ad8671ar-reel C40c to +125c 8-lead soic r-8 ad8671ar-reel 7 C40c to +125c 8-lead soic r-8 ad8671arm- r 2 C40c to +125c 8-lead msop rm-8 bga ad8671arm- r e el C40c to +125c 8-lead msop rm-8 bga ad8672ar C40c to +125c 8-lead soic r-8 ad8672ar-reel C40c to +125c 8-lead soic r-8 ad8672ar-reel 7 C40c to +125c 8-lead soic r-8 ad8672arm- r 2 C40c to +125c 8-lead msop rm-8 bha ad8672arm- r e el C40c to +125c 8-lead msop rm-8 bha ad8674ar C40c to +125c 14-lead soic r-14 ad8674ar-reel C40c to +125c 14-lead soic r-14 ad8674ar-reel 7 C40c to +125c 14-lead soic r-14 ad8674aru C40c to +125c 14-lead tssop ru-14 ar8674aru-re el C40c to +125c 14-lead tssop ru-14 ? 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 . d03718C0C 4/04(b)

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