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low noise rail-to-rail differential adc driver ad8139 rev. a in fo rmation furn ished by an alog d e v i c e s is believed to be accurate and reliable. how e ver, n o resp on sibili ty is assume d b y a n alog de vices fo r its use, nor for an y i n fri n geme nt s of p a t e nt s or ot h e r ri ght s o f th ird parties th at may result fro m its use . specifications subjec t 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 herwi s e u n der a n y p a t e nt or p a t e nt ri ghts of analog de v i ces. trademarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2004 analog de vices, i n c. al l r i ght s r e ser v ed . fea t ures fully dif f erenti al low noise 2.25 nv/ hz 2.1 pa/h z low harmonic distortion 98 dbc sfdr @ 1 mhz 85 dbc sfdr @ 5 mhz 72 dbc sfdr @ 20 mhz high speed 410 mh z, 3 db bw (g = 1) 800 v/s s l ew r a te 45 ns sett ling ti me to 0.01% 69 db output balance @ 1 mh z 80 db dc cmrr low offset: 0.5 mv max low input offset current: 0. 5 a max differentia l inp u t and output differential-to-differential or s i ngle-ended-to-different ial operation rail-to-rail out p ut adjustable out p ut common- mode voltage wide s u pply voltage range: 5 v to 12 v avail a ble in sm all soic packa g e applic a t io ns adc driv ers to 18 bits single-ended-t o-differential converters differentia l filt ers level shift e rs differentia l pc b bo ard drivers differentia l ca ble drivers func ti on a l bl ock di a g r a m 04679-0-001 ?i n 1 v ocm 2 v+ 3 +out 4 +in 8 nc 7 v? 6 ?out 5 nc = no connect ad8139 fi g u r e 1 . gener a l description the ad8139 is a n u l tralo w n o is e , hig h p e r f o r m a n c e dif f er en t i al a m p l if ier wi t h ra il-t o-rail o u t p u t . w i t h i t s lo w n o ise , high s f dr , a nd wide b a n d wi d t h, i t is a n i d e a l ch o i c e fo r dr i v i n g a d cs w i t h r e s o l u tio n s t o 1 8 b i ts. th e ad8 139 is easy t o a p p l y , a n d i t s in - t e rn al co mm o n - m od e f e e d ba ck a r c h i t ec t u r e allo w s i t s o u t p u t co mm o n - m o d e v o l t a g e t o b e con t r o l l e d b y t h e v o l t a g e a p plie d to one pi n . t h e i n te r n a l f e e d b a c k l o op a l s o prov i d e s out - s t an di n g o u t p u t b a lan c e as w e l l as s u p p r es sion o f e v en-o r d er ha r m o n ic di sto r t i o n p r o d uc ts. f u l l y dif f er en t i a l a nd sin g le - en d e d - t o -d if fer e n t ia l ga i n co nf i g ura t io n s a r e e a si ly r e a l ize d b y th e ad8139. s i m p le ext e r n al f eed back n e tw o r ks co n s is tin g o f a t o tal o f fo ur r e si s t o r s det e r m in e th e am p l if ier s clos e d -lo o p ga in. the ad8139 is ma n u fac t ur ed on ad i s p r o p r i eta r y s e co nd g e n- era t io n xfcb pr o c es s, ena b lin g i t t o achi e v e lo w le v e l s o f dist or - t i on w i t h i n put vo lt age noi s e of on ly 1 . 8 5 n v / hz . the ad8139 is a v a i la b l e in an 8 - lead so i c p a cka g e wi th an ex p o s e d p a dd le (ep) o n t h e u n d e rside o f i t s b o dy a n d a 3 m m 3 mm lfcsp . i t is ra t e d t o o p era t e o v er t h e t e m p era t ur e ra n g e o f ?40c t o +125c. 1 10 100 1k 10k 100k 1m 10m 1g 100m 10 100 04679-0-078 frequency (hz) in pu t volta g e n o ise ( n v/ h z ) f i gure 2. input v o lt age n o is e v s . f r equ e nc y
ad8139 rev. a | page 2 of 24 table of contents v s = 5 v, v ocm = 0 v specifications .............................................. 3 v s = 5 v, v ocm = 2.5 v specifications ............................................. 5 absolute maximum ratings ............................................................ 7 thermal resistance ...................................................................... 7 esd caution .................................................................................. 7 pin configuration and function descriptions ............................. 8 typical performance characteristics ............................................. 9 theory of operation ...................................................................... 18 typical connection and definition of terms ........................ 18 applications ..................................................................................... 19 estimating noise, gain, and bandwidth with matched feedback networks .................................................................... 19 outline dimensions ....................................................................... 24 ordering guide .......................................................................... 24 revision history 8/04data sheet changed from a rev. 0 to rev. a. added 8-lead lfcsp.........................................................universal changes to general description .................................................... 1 changes to figure 2.......................................................................... 1 changes to v s = 5 v, v ocm = 0 v specifications ......................... 3 changes to v s = 5 v, v ocm = 2.5 v specifications......................... 5 changes to table 4............................................................................ 7 changes to maximum power dissipation section....................... 7 changes to figure 26 and figure 29............................................. 12 inserted figure 39 and figure 42.................................................. 14 changes to figure 45 to figure 47................................................ 15 inserted figure 48........................................................................... 15 changes to figure 52 and figure 53............................................. 16 changes to figure 55 and figure 56............................................. 17 changes to table 6.......................................................................... 19 changes to voltage gain section.................................................. 19 changes to driving a capacitive load section .......................... 22 changes to ordering guide .......................................................... 24 updated outline dimensions ....................................................... 24 5/04revision 0: initial version
ad8139 rev. a | page 3 of 24 v s = 5 v, v ocm = 0 v specifications @ 25c, diff. gain = 1, r l, dm = 1 k?, r f = r g = 200 ?, unless otherwise noted. t min to t max = ?40c to +125c. table 1. parameter conditions min typ max unit differential input performance dynamic performance ?3 db small signal bandwidth v o, dm = 0.1 v p-p 340 410 mhz ?3 db large signal bandwidth v o, dm = 2 v p-p 210 240 mhz bandwidth for 0.1 db flatness v o, dm = 0.1 v p-p 45 mhz slew rate v o, dm = 2 v step 800 v/s settling time to 0.01% v o, dm = 2 v step, c f = 2 pf 45 ns overdrive recovery time g = 2, v in, dm = 12 v p-p triangle wave 30 ns noise/harmonic performance sfdr v o, dm = 2 v p-p, f c = 1 mhz 98 db v o, dm = 2v p-p, f c = 5 mhz 85 db v o, dm = 2 v p-p, f c = 20 mhz 72 db third-order imd v o, dm = 2 v p-p, f c = 10.05 mhz 0.05 mhz ?90 dbc input voltage noise f = 100 khz 2.25 nv/hz input current noise f = 100 khz 2.1 pa/hz dc performance input offset voltage v ip = v in = v ocm = 0 v ?500 150 +500 v input offset voltage drift t min to t max 1.25 v/oc input bias current t min to t max 2.25 8.0 a input offset current 0.12 0.5 a open-loop gain 114 db input characteristics input common-mode voltage range ?4 +4 v input resistance differential 600 k? common mode 1.5 m? input capacitance common mode 1.2 pf cmrr ?v icm = 1 v dc, r f = r g = 10 k? 80 84 db output characteristics output voltage swing each single-ended output, r f = r g = 10 k? ?v s + 0.20 +v s C 0.20 v each single-ended output, r l, dm = open circuit, r f = r g = 10 k? ?v s + 0.15 +v s C 0.15 v output current each single -ended output 100 ma output balance error f = 1 mhz ?69 db v ocm to v o, cm performance v ocm dynamic performance ?3 db bandwidth v o, cm = 0.1 v p-p 515 mhz slew rate v o, cm = 2 v p-p 250 v/s gain 0.999 1.000 1.001 v/v v ocm input characteristics input voltage range ?3.8 +3.8 v input resistance 3.5 m? input offset voltage v os, cm = v o, cm ? v ocm ; v ip = v in = v ocm = 0 v ?900 300 +900 v input voltage noise f = 100 khz 3.5 nv/hz input bias current 1.3 4.5 a cmrr ?v ocm /?v o, dm , ?v ocm = 1 v 74 88 db
ad8139 rev. a | page 4 of 24 parameter conditions min typ max unit power supply operating range 4.5 6 v quiescent current 24.5 25.5 ma +psrr change in +v s = 1v 95 112 db ?psrr change in ?v s = 1v 95 109 db operating temperature range ?40 +125 c
ad8139 rev. a | page 5 of 24 v s = 5 v, v ocm = 2.5 v specifications @ 25c, diff. gain = 1, r l, dm = 1 k?, r f = r g = 200 ?, unless otherwise noted. t min to t max = ?40c to +125c. table 2. parameter conditions min typ max unit differential input performance dynamic performance ?3 db small signal bandwidth v o, dm = 0.1 v p-p 330 385 mhz ?3 db large signal bandwidth v o, dm = 2 v p-p 135 165 mhz bandwidth for 0.1 db flatness v o, dm = 0.1 v p-p 34 mhz slew rate v o, dm = 2 v step 540 v/s settling time to 0.01% v o, dm = 2 v step 55 ns overdrive recovery time g = 2, v in, dm = 7 v p-p triangle wave 35 ns noise/harmonic performance sfdr v o, dm = 2 v p-p, f c = 1 mhz 99 db v o, dm = 2 v p-p, f c = 5 mhz, (r l = 800 ?) 87 db v o, dm = 2 v p-p, f c = 20 mhz, (r l = 800 ?) 75 db third-order imd v o, dm = 2 v p-p, f c = 10.05 mhz 0.05 mhz ?87 dbc input voltage noise f = 100 khz 2.25 nv/hz input current noise f = 100 khz 2.1 pa/hz dc performance input offset voltage v ip = v in = v ocm =0 v ?500 150 +500 v input offset voltage drift t min to t max 1.25 v/oc input bias current t min to t max 2.2 7.5 a input offset current 0.13 0.5 a open-loop gain 112 db input characteristics input common-mode voltage range 1 4 v input resistance differential 600 k? common-mode 1.5 m? input capacitance common-mode 1.2 pf cmrr ?v icm = 1 v dc, r f = r g = 10 k? 75 79 db output characteristics output voltage swing each single-ended output, r f = r g = 10 k? ?v s + 0.15 +v s ? 0.15 v each single-ended output, r l, dm = open circuit, r f = r g = 10 k? ?v s + 0.10 +v s ? 0.10 v output current each single-ended output 80 ma output balance error f = 1 mhz ?70 db v ocm to v o, cm performance v ocm dynamic performance ?3 db bandwidth v o, cm = 0.1 v p-p 440 mhz slew rate v o, cm = 2 v p-p 150 v/s gain 0.999 1.000 1.001 v/v v ocm input characteristics input voltage range 1.0 3.8 v input resistance 3.5 m? input offset voltage v os, cm = v o, cm ? v ocm ; v ip = v in = v ocm = 2.5 v ?1.0 0.45 +1.0 mv input voltage noise f = 100 khz 3.5 nv/hz input bias current 1.3 4.2 a cmrr ?v ocm /?v o (dm), ?v ocm = 1 v 67 79 db
ad8139 rev. a | page 6 of 24 parameter conditions min typ max unit power supply operating range +4.5 6 v quiescent current 21.5 22.5 ma +psrr change in +v s = 1 v 86 97 db ?psrr change in ?v s = 1 v 92 105 db operating temperature range ?40 +125 c
ad8139 r e v. a | pa ge 7 o f 2 4 absolute maximum ra tings table 3. p a r a m e t e r r a t i n g supply voltage 12 v v ocm v s power dissi pati on see figure 3 input common-mode vol t age v s storage temperature C65c to +125c operating tem p erature range C40c to +125c lead temperature range (sol dering 10 s e c) 300c junction tempe r ature 150c 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 on ly ; f u nc t i on a l op e r a t i o n of t h e d e v i c e a t t h e s e or a n y o t h e r con d i t io 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 i o n o f t h is sp e c if ica t ion is n o t i m plie d . e x p o sur e t o a b s o l u t e 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 . thermal resist ance ja is sp e c if ie d fo r t h e w o rst - ca s e co ndi t i on s, i . e. , ja is sp e c if ie d f o r d e v i ce so l d er ed i n ci r c ui t boa r d f o r s u rfa c e - m o un t pa c k a g es . table 4. therm a l resistance package type ja unit soic-8 with ep/4-layer 70 c/w l f c s p / 4 - l a y e r 7 0 c / w maximum power dissipation the max i m u m s a f e p o wer dis s i p a t ion in t h e ad8139 p a c k ag e is l i m i t e d b y th e a s soci a t ed ri se i n j u n c ti o n t e m p e r a t u r e (t j ) o n t h e d i e . a t a p p r o x i m a t e l y 15 0 c , wh ic h i s th e g l a s s tra n si ti o n t e m - p e r a t u r e , t h e pl as t i c w i l l chan ge i t s p r op er t i e s . e ven te m p o r a r i l y exce e d i n g t h i s t e m p er a t ur e li mi t ma y chan ge t h e s t r e ss es t h a t t h e p a cka g e exer ts on t h e die, p e r m ane n t l y shi f t i ng t h e p a rame t r ic p e r f o r mance o f the ad8 139. e x ce edin g a j u nc tio n tem p er a t ure o f 1 7 5 c f o r a n e x t e n d ed pe rio d o f tim e ca n r e s u l t in c h a n g e s in th e silicon de vices p o t e n t ia l l y c a us ing f a i l ure . the p o w e r dis s i p a t e d in t h e p a cka g e (p d ) i s th e s u m o f th e q u ies c en t p o w e r dissi p a t ion and t h e p o w e r dissi p a te d i n t h e p a cka g e d u e t o t h e lo ad dr i ve fo r al l o u t p u t s. th e q u ie s c e n t p o w e r is t h e v o l t a g e b e tw e e n t h e s u p p l y p i n s ( v s ) tim e s th e q u ies c en t c u r r en t (i s ). th e lo ad c u r r en t co n s is t s o f dif f er en t i al a nd co mm on- m o d e c u r r en ts f l o w in g t o t h e lo ad , as we l l as curr e n t s f l o w i n g th r o ugh th e ext e rn al f eed ba ck n e t w o r k s a n d t h e i n t e r n al comm on- m o d e fe e d b a ck lo o p . the in ter n al r e sis t o r ta p used i n t h e co mm o n -m od e f eed ba ck l o o p p l a c e s a 1 k ? dif f er en t i al lo ad o n t h e o u t p u t . rms o u t p u t v o l t a g es sh o u ld b e co n s i d er ed w h en d e alin g w i t h ac si gn als. air f l o w r e d u ces ja . a l s o , m o r e m e t a l d i r e c t l y i n c o n t a c t w i t h t h e p a cka g e le ads f r o m m e t a l t r aces, t h r o ug h holes, g r o u n d , a nd p o w e r pla n es wi l l r e d u ce t h e ja . f i gur e 3 sh o w s t h e max i m u m s a fe p o w e r dissi p a t io n in t h e p a cka g e v e rs us t h e am b i e n t t e m p era t ur e fo r t h e exp o s e d p a ddle (ep) so i c -8 ( ja = 70c/w) p a c k a g e an d lfcs p ( ja = 70c/w) o n a j e d e c s t anda r d 4-la yer bo a r d . ja val u es a r e a p p r o x im a t io n s . 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 ? 4 0 ? 20 0 2 0 4 0 6 0 8 0 100 120 04679-0-055 ambient temperature ( c) m a xim u m pow e r d i ssipa tion ( w ) soic and lfcsp f i g u re 3. m a x i m u m p o wer d i s s i pat i on v s . t e mpe r at u r e f o r a 4-laye r b o a r d esd c a ution esd (electrostatic discharge) sensitive device. ele c trosta tic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharge without detection. although this product features proprie - tary esd protect i on circuitry, permanent damag e may o ccur on devices subje c ted to high energy electrostatic discharges. ther efore, prop er esd precautions a r e reco mmende d to avoid performance degradation or lo ss of functionality.
ad8139 r e v. a | pa ge 8 o f 2 4 pin conf igura t ion and fu nction descriptions 04679-0-003 ?i n 1 v ocm 2 v+ 3 +out 4 +in 8 nc 7 v? 6 ?out 5 nc = no connect ad8139 f i gure 4. pin config ur ation ta ble 5. pi n f u nct i on d e s c ri pt i o ns pin no. mnemonic description 1 ? i n i n v e r t i n g i n p u t . 2 v ocm an internal feedback l oop drive s the output common-mode vo ltage to be equal to the voltage ap plied to the v ocm pin, provided the amplifiers operat i on remain s line ar. 3 v+ positive power s u pply voltage. 4 +out positive side of the differential output. 5 ?out negative side of the differential output. 6 v? negative power supply voltage. 7 nc no internal connection. 8 + i n n o n i n v e r t i n g in p u t . 04679-0-072 r g = 200 ? 60.4 ? 60.4 ? 50 ? v test test signal source 50 ? r g = 200 ? v ocm ? + v o, dm r f c f c f r f r l, dm = 1k ? ad8139 f i gur e 5 . ba si c t e st ci r c ui t 04679-0-075 r g = 200 ? 60.4 ? 60.4 ? 50 ? v test test signal source 50 ? r g = 200 ? v ocm ? + v o, dm r f = 200 ? r f = 200 ? c l, dm r l, dm r s r s ad8139 f i gure 6. cap a c i tiv e l oad t e s t c i rcuit, g = +1
ad8139 r e v. a | pa ge 9 o f 2 4 typical perf orm ance cha r acte ristics u n l e ss ot he r w i s e no te d, d i f f . g a i n = + 1 , r g = r f = 200 ?, r l, d m = 1 k?, v s = 5 v , t a = 25c, v oc m = 0 v . ref e r t o th e b a sic t e s t cir c ui t in f i gur e 5 fo r t h e def i ni t i on o f ter m s. 2 ?1 3 ?1 2 ?1 1 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 1 1 0 100 1000 04679-0-004 frequency (mhz) norm alized closed- l oop gain ( d b) g = 1 g = 2 g = 5 g = 10 r g = 200 ? v o, dm = 0.1v p-p f i gur e 7 . sm al l si g n a l f r equenc y resp o n se f o r v a ri o u s g a i n s 5 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 10 100 1000 04679-0-005 frequency (mhz) closed- l oop gain ( d b) v s = 5v v s = +5v v o, dm = 0.1v p-p f i g u re 8. s m a l l sig n al f r equenc y r e s p ons e f o r v a r i ous p o wer s u p p l i es 3 ?1 2 ?1 1 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 10 100 1000 04679-0-006 frequency (mhz) closed- l oop gain ( d b) v o, dm = 0.1v p-p +125 c +85 c +25 c ?4 0 c f i g u re 9. s m a l l sig n al f r equenc y r e s p ons e at v a ri ous ?t emper a t u r e s 2 ?1 3 ?1 2 ?1 1 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 1 1 0 100 1000 04679-0-007 frequency (mhz) norm alized closed- l oop gain ( d b) g = 1 g = 2 g = 5 g = 10 r g = 200 ? v o, dm = 2.0v p-p f i gur e 1 0 . la r g e signa l f r equenc y r e sp o n se f o r v a ri o u s g a i n s 3 ?1 2 ?1 1 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 10 100 1000 04679-0-008 frequency (mhz) closed- l oop gain ( d b) v s = 5v v s = +5v v o, dm = 2.0v p-p f i g u re 11. lar g e s i g n al f r equenc y r e s p ons e f o r v a r i ous p o we r sup p l ies 3 ?1 2 ?1 1 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 10 100 1000 04679-0-009 frequency (mhz) closed- l oop gain ( d b) v o, dm = 2.0v p-p +125 c +85 c ?40 c +25 c f i g u re 12. lar g e s i g n al f r equenc y r e s p ons e at v a ri ous t e mpe r at u r es
ad8139 rev. a | page 10 of 24 3 ?1 2 ?1 0 ?1 1 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 10 100 1000 04679-0-040 frequency (mhz) closed- l oop gain ( d b) v o, dm = 0.1v p-p r l = 100 ? r l = 200 ? r l = 500 ? r l = 1k ? f i g u re 13. sm a ll s i g n al f r equenc y r e s p ons e f o r v a r i ous l oads 3 ?1 2 ?1 1 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 10 100 1000 04679-0-011 frequency (mhz) closed- l oop gain ( d b) v o, dm = 0.1v p-p c f = 1pf c f = 2pf c f = 0pf f i g u re 14. sm a ll s i g n al f r equenc y r e s p ons e f o r v a r i ous c f 6 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 5 10 100 1000 04679-0-012 frequency (mhz) closed- l oop gain ( d b) v o, dm = 0.1v p-p v ocm = +4.3v v ocm = +4v v ocm = 0v v ocm = ? 4v v ocm = ? 4.3v f i g u re 15. sm a ll s i g n al f r equenc y r e s p ons e at v a ri ous v oc m ?1 3 ?1 2 ?1 0 ?1 1 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 10 100 1000 04679-0-041 frequency (mhz) closed- l oop gain ( d b) v o, dm = 2.0v p-p r l = 100 ? r l = 200 ? r l = 500 ? r l = 1k ? f i g u re 16. lar g e s i g n al f r equenc y r e s p ons e f o r v a r i ous l oads 2 ?1 3 ?1 1 ?1 2 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 10 100 1000 04679-0-014 frequency (mhz) closed- l oop gain ( d b) v o, dm = 2.0v p-p c f = 0pf c f = 1pf c f = 2pf f i g u re 17. lar g e s i g n al f r equenc y r e s p ons e f o r v a r i ous c f ?0.5 ?0.4 ?0.3 ?0.2 ?0.1 0 0.1 0.2 0.3 0.4 0.5 1 1 0 100 04679-0-042 frequency (hz) normalize d clos e d -loop gain (db) r l = 1k ? (v o, dm = 0.1v p-p) r l = 1k ? (v o, dm = 2.0v p-p) r l = 100 ? (v o, dm = 0.1v p-p) r l = 100 ? (v o, dm = 2.0v p-p) f i g u re 18. 0. 1 db f l at nes s f o r v a ri ous l oads and o u t p ut a m pl it udes
ad8139 rev. a | page 11 of 24 ?3 0 ?130 ?120 ?110 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 0.1 1 1 0 100 04679-0-015 frequency (mhz) distortion ( d bc) v o, dm = 2.0v p-p v s = +5v v s = 5v f i gur e 1 9 . sec o nd h a r m o n i c d i st or t i on vs . f r e q ue nc y and suppl y v o l t a g e ?3 0 ?140 ?130 ?120 ?110 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 0.1 1 1 0 100 04679-0-016 frequency (mhz) distortion ( d b) v o, dm = 2.0v p-p g = 1 g = 2 g = 5 f i gur e 2 0 . sec o nd h a r m o n i c d i st or t i on vs . f r e q ue nc y and ga in ?3 0 ?130 ?120 ?110 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 0.1 1 1 0 100 04679-0-017 frequency (mhz) distortion ( d bc) v o, dm = 2.0v p-p r l = 100 ? r l = 200 ? r l = 500 ? r l = 1k ? f i gur e 2 1 . sec o nd h a r m o n i c d i st or t i on vs . f r e q ue nc y and l o a d ?3 0 ?130 ?120 ?110 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 0.1 1 1 0 100 04679-0-018 frequency (mhz) distortion ( d bc) v o, dm = 2.0v p-p v s = +5v v s = 5v f i g u re 22. thi r d h a rm oni c d i s t o r t i on v s . f r equenc y and sup p ly v o lt ag e ?3 0 ?140 ?130 ?120 ?110 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 0.1 1 1 0 100 04679-0-019 frequency (mhz) distortion ( d b) v o, dm = 2.0v p-p g = 1 g = 2 g = 5 f i g u re 23. thi r d h a rm oni c d i s t o r t i on v s . f r equenc y and g a in ?3 0 ?130 ?120 ?110 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 0.1 1 1 0 100 04679-0-020 frequency (mhz) distortion ( d bc) v o, dm = 2.0v p-p r l = 100 ? r l = 200 ? r l = 500 ? r l = 1k ? f i g u re 24. thi r d h a rm oni c d i s t o r t i on v s . f r equenc y and l oad
ad8139 rev. a | page 12 of 24 ?3 0 ?130 ?120 ?110 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 0.1 1 1 0 100 04679-0-021 frequency (mhz) distortion ( d bc) v o, dm = 2.0v p-p r f = 200 ? r f = 500 ? r f = 1k ? f i gur e 2 5 . sec o nd h a r m o n i c d i st or t i on vs . f r e q ue nc y and r f ?8 0 ?9 0 ?100 ?110 ?120 ?130 ?140 ?150 01 2345 678 04679-0-022 v o, dm (v p-p) distortion ( d bc) f c = 2mhz v s = +5v v s = 5v f i gure 26. s e c o nd ha rm on ic d i s t o r t i o n v s . o u tput a m pli t ude ?6 0 ?130 ?100 ?120 ?110 ?9 0 ?8 0 ?7 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 04679-0-023 v ocm (v) distortion ( d bc) v o, dm = 2v p-p f c = 2mhz second harmonic third harmonic f i gur e 2 7 . ha rm onic di stor ti on vs . v ocm , v s = +5 v ?3 0 ?130 ?120 ?110 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 0.1 1 1 0 100 04679-0-024 frequency (mhz) distortion ( d bc) v o, dm = 2.0v p-p r f = 200 ? r f = 1k ? r f = 500 ? f i g u re 28. thi r d h a rm oni c d i s t o r t i on v s . f r equenc y and r f ?8 0 ?9 0 ?100 ?110 ?120 ?130 ?140 ?150 08 7 6 5 4 3 2 1 04679-0-025 v o, dm (v p-p) distortion ( d bc) f c = 2mhz v s = +5v v s = 5v f i gure 29. thi r d h a rm oni c d i s t o r ti on v s . o u tput a m plitu d e ?6 0 ?130 ?100 ?120 ?110 ?9 0 ?8 0 ?7 0 ?5 ? 4 ?3 ? 2 ?0 0 1 2 3 4 5 04679-0-026 v ocm (v) distortion ( d bc) v o, dm = 2v p-p f c = 2mhz second harmonic third harmonic f i gur e 3 0 . ha rm onic di stor ti on vs . v ocm , v s = 5 v
ad8139 rev. a | page 13 of 24 ?100 ?7 5 ?5 0 ?2 5 50 25 75 0 100 04679-0-043 time (ns) v o, dm (v ) 5ns/div v o, dm = 100mv p-p c f = 0pf (c f = 0pf, v s = 5v) v o, dm (c f = 2pf, v s = 5v) f i g u re 31. sm a ll s i g n al t r ans i ent r e s p ons e f o r v a r i ous c f ? 0.100 ? 0.075 ? 0.050 ? 0.025 0.050 0.025 0.075 0 0.100 04679-0-064 time (ns) v o, dm (v ) 5ns/div r s = 31.6 ? c l, dm = 30pf r s = 63.4 ? c l, dm = 15pf f i g u re 32. sm a ll s i g n al t r ans i ent r e s p ons e f o r capa cit i ve l oads 5 ?100 ?9 5 ?9 0 ?8 5 ?8 0 ?7 5 ?7 0 ?6 5 ?6 0 ?5 5 ?5 0 ?4 5 ?4 0 ?3 5 ?3 0 ?2 5 ?2 0 ?1 5 ?1 0 ?5 0 9.55 9.65 9.75 9.85 9.95 10.05 10.15 10.25 10.35 10.45 10.55 04679-0-027 frequency (mhz) normalize d outp ut (dbc ) v o, dm = 2v p-p f c 1 = 10mhz f c 2 = 10.1mhz f i gur e 3 3 . int e rm odul a t i o n di stor ti on ?2.5 ?1.5 ?1.0 ?0.5 1.0 0.5 2.0 ?2.0 1.5 0 2.5 04679-0-044 time (ns) v o, dm (v ) 5ns/div 4v p-p c f = 0pf 2v p-p c f = 2pf c f = 0pf c f = 2pf f i g u re 34. lar g e s i g n al t r ans i ent r e s p ons e f o r c f ? 1.5 ? 1.0 ? 0.5 1.0 0.5 0 1.5 04679-0-065 time (ns) v o, dm (v ) 5ns/div r s = 63.4 ? c l, dm = 15pf r s = 31.6 ? c l, dm = 30pf f i g u re 35. lar g e s i g n al t r ans i ent r e s p ons e f o r capa cit i ve l oads 1.5 ?1.5 ?1.0 ?0.5 0 0.5 1.0 600 ?600 ?400 ?200 0 200 400 04679-0-034 time (ns) amp l itude (v ) e rror ( v) 1d iv = 0.01% c f = 2pf v o, dm = 2.0v p-p 35ns/div error v in v o, dm f i g u re 36. s e t t l ing ti me ( 0 .0 1%)
ad8139 rev. a | page 14 of 24 ? 1.5 ? 1.0 ? 0.5 1.0 0.5 0 1.5 04679-0-069 time (ns) v ocm (v ) 10ns/div v o, cm = 2v p-p v in, dm = 0v 5v +5v f i g u re 37. v ocm l a rg e sig n al t r ans i ent r e s p ons e 0 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 ?3 0 ?2 0 ?1 0 1 1 0 100 500 04679-0-066 frequency (mhz) cmrr (db) v in, cm = 0.2v p-p input cmrr = ? v o, cm / ? v in, cm r f = r g = 200 ? r f = r g = 10k ? fi g u r e 3 8 . c m r r v s . fr e q u e n c y 1 10 100 1k 10k 100k 1m 10m 1g 100m 10 100 04679-0-079 frequency (hz) in pu t volta ge n o ise ( n v/ h z ) fi g u r e 3 9 . i n p u t v o l t a g e n o i s e v s . fr e q u e n c y 6 ?9 ?7 ?8 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 5 10 100 1000 04679-0-038 frequency (mhz) closed- l oop gain ( d b) v o, cm = 0.1v p-p v o, cm = 2.0v p-p v s = +5v v s = +5v v s = 5v v s = 5v f i g u re 40. v ocm f r e q uenc y r e s p ons e f o r v a r i ous sup p lies 0 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 ?3 0 ?2 0 ?1 0 1 1 0 100 500 04679-0-045 frequency (mhz) v ocm cmrr (db) v o, cm = 0.2v p-p v ocm cmrr = ? v o, dm / ? v o, cm f i g u re 41. v ocm c m rr vs . f r e q ue nc y 1 10 100 1k 10k 100k 1m 10m 1g 100m 10 100 04679-0-080 frequency (hz) v ocm n o ise ( n v/ h z ) f i g u re 42. v ocm v o lt age n o is e v s . f r equ e nc y
ad8139 rev. a | page 15 of 24 0 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 ?3 0 ?2 0 ?1 0 1 1 0 100 500 04679-0-047 frequency (mhz) p s rr (db) r l, dm = 1k ? psrr = ? v o, dm / ? v s ?psrr +psrr fi g u r e 4 3 . p s r r v s . fr e q u e n c y 100 0.01 0.1 1 10 0.1 1 1 0 100 1000 04679-0-028 frequency (mhz) outp ut imp e dance ( ? ) v s = +5v v s = 5v f i gure 44. sing le -ended o u tput imp e danc e vs. f r equ e nc y 700 ?700 ?600 ?500 ?400 ?300 ?200 ?100 0 100 200 300 400 500 600 100 1k 10k 04679-0-068 resistive load ( ? ) s i ngle -e nde d outp ut s w ing from rail (mv ) v s+ ? v op v on ? v s? v s = +5v v s = 5v f i g u re 45. o u t p ut s a t u r a t i on v o lt ag e v s . o u t p ut l oad ?1 4 ?1 2 ?1 0 ?8 ?6 ?4 ?2 0 2 4 6 8 10 12 14 04679-0-046 time (ns) voltage (v) 50ns/div v o, dm 2 v in, dm g = 2 f i gure 46. o v e r dr ive r eco ver y 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 ?3 0 ?2 0 ?1 0 1 1 0 100 500 04679-0-067 frequency (mhz) outp ut balance (db) v o, dm = 1v p-p output balance = ? v o, cm / ? v o, dm f i gure 47. o u tput b a l a nce v s . f r eq uen c y 50 100 150 200 250 ? 4 0 120 100 80 60 40 20 0 ?20 300 ?300 ?50 ?100 ?150 ?200 ?250 04679-0-077 temperature ( c) v op sw ing from rail ( m v) v on sw ing from rail ( m v) v s = 5v g = 1 (r f = r g = 200 ? ) r l, dm = 1k ? v s+ ? v op v on ? v s? f i g u re 48. o u t p ut s a t u r a t i on v o lt ag e v s . t e mper at ure
ad8139 rev. a | page 16 of 24 1.0 3.0 70 95 120 170 145 2.5 2.0 1.5 ? 4 0 ? 20 0 2 0 4 0 6 0 8 0 100 120 04679-0-062 temperature ( c) i bias ( a) i os (na) i os i bias f i gure 49. input b i as and o ffset c u rr en t vs . t e mp er atu r e ?1 0 ?5 ? 4 ?3 ? 2 ?1 0 1 2 3 4 5 ?8 ?6 ?4 ?2 0 2 4 6 8 10 04679-0-073 v acm (v) inp u t bias curre nt ( a) v s = 5v v s = +5v f i gure 50. input b i a s current v s . input c o mmon-m ode v o ltage 5 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 ?5 5 4 3 2 1 0 ?1 ?2 ?3 ?4 04679-0-048 v ocm (v) v out, c m (v ) v s = 2.5v v s = 5v f i g u re 51. v o , cm vs . v oc m input v o lt age 20 26 25 24 23 22 21 ? 4 0 ? 20 0 2 0 4 0 6 0 8 0 100 120 04679-0-060 temperature ( c) s u p p l y curre nt (ma) v s = +5v v s = 5v f i gure 52. sup p l y current v s . t e mper at ur e 0 300 ?600 ?400 ?200 0 200 400 600 250 200 150 100 50 ? 4 0 ? 20 0 2 0 4 0 6 0 8 0 100 120 04679-0-061 temperature ( c) v os, dm ( v) v os, c m ( v) v os, cm v os, dm f i g u re 53. o f f s et v o ltage v s . t e mper atur e 50 45 40 35 30 25 20 15 10 5 0 ? 500 ? 450 ? 400 ? 350 ? 300 ? 250 ? 200 ? 150 ? 100 ?50 0 50 100 150 200 250 300 350 400 450 500 04679-0-071 v os, dm ( v) fre q ue ncy count = 350 mean = ? 50 v std dev = 100 v f i g u re 54. v os , d m di s t r i b u t i o n
ad8139 rev. a | page 17 of 24 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 ? 4 0 ? 20 0 2 0 4 0 6 0 8 0 100 120 04679-0-063 temperature ( c) i voc m ( a) f i g u re 55. v ocm bias c u rrent vs. t e mp e r atur e ?6 ?5 ? 4 ?3 ? 2 ?1 0 1 2 3 4 5 ?4 ?2 0 2 4 6 04679-0-074 v ocm (v) v ocm curre nt ( a) v s = 5v v s = +5v f i g u re 56. v ocm bias c u rrent vs. v ocm inp u t v o l t a g e
ad8139 rev. a | page 18 of 24 theor y of opera tion the ad8139 is a hig h s p e e d , lo w n o is e dif f er en tial am p l if ier fa b r ica t e d o n t h e analog de vic e s s e con d g e n e r a tio n ex tra f a s t c o m p lemen t a r y b i p o la r (xfc b) p r o c es s. i t is desig n e d t o p r o v id e tw o c l ose l y balan c ed d i f f er en tial o u t p u t s in r e s p o n se to ei t h er dif f er en t i al o r sin g le-e n d e d i n p u t sig n als. dif f er en t i al ga in is s e t b y ex t e r n al r e sis t o r s, simila r t o tradi t io nal v o l t a g e - fe e d b a ck o p er a t io nal a m plif iers. the co mm on- m o d e le ve l o f t h e o u t p ut v o l t a g e is s e t b y a v o l t a g e a t t h e v oc m p i n an d is i n de- p e nden t o f th e in p u t comm o n -m o d e v o l t a g e . th e ad8139 has a n h- b r idge in pu t st a g e fo r hig h sle w ra t e , lo w no is e , a nd lo w d i stor t i on op e r at i o n a n d r a i l - t o - r a i l output st age s t h a t prov i d e max i m u m d y n a mic o u t p u t ra n g e. this s e t o f fe a t ur es a l lo ws fo r co n v e n ien t sin g le-ende d-t o - d if fer e n t ia l con v ersio n , a co m m on n e e d t o ta k e adva n t a g e o f m o der n hig h r e s o l u t i o n ad cs wi th dif f er en t i al in puts. t y p i c a l c o nnec t i o n and defini tio n o f terms f i gur e 57 s h o w s a typ i cal co nn e c tio n f o r th e ad8139, usin g ma tc he d e x te r n a l r f /r g n e tw o r ks. th e dif f er en t i al i n p u t t e r m inals o f th e ad8139, v ap a nd v an , a r e u s e d a s s u m m i n g j u n c t i o n s. a n ext e r n al r e fer e n c e v o l t a g e a p plie d t o t h e v oc m t e r m inal s e ts t h e o u t p ut co mmo n - m o d e v o l t a g e . the tw o output te r m i n a l s , v op a nd v on , m o v e i n o p p o si te dir e c t io n s in a balan c e d fas h ion in r e sp o n s e t o a n in p u t sig n a l . 04679-0-050 + ? v ap v an v on v op ? + v o, dm r l, dm ad8139 c f r f r g r g c f r f v ip v ocm v in f i g u re 57. t y pic a l conne c t io n the dif f er en t i al o u t p ut v o l t a g e is def i ne d as on op dm o, v v v ? = (1) c o mm on- m o d e v o l t a g e is t h e a v era g e o f t w o v o l t a g es. th e o u t p ut co m m on- m o d e vol t a g e is def i n e d as 2 on op cm o, v v v + = (2) out p ut bal a n c e o u t p u t b a lan c e is a me asur e o f h o w w e l l v op and v on are ma t c h e d in am pli t ude an d h o w p r ecis e l y they a r e 180 deg r ees out of ph a s e w i t h e a ch ot he r . i t i s th e i n t e rn a l c o m m o n - m od e fe e d b a ck lo o p th a t fo r c e s t h e sign al co m p o n en t o f t h e o u t p u t c o m m on - m o d e tow a rd s z e ro , re su lt i n g i n t h e ne ar p e r f e c t l y b a la n c e d dif f er e n t i al o u t p u t s o f i d en t i cal a m p l i t ude a n d exa c t l y 180 de g r ees o u t o f p has e . th e o u t p u t bala n c e p e rf o r m a n c e do es n o t r e q u i r e t i g h tl y m a t c h e d ext e r n al co m p o n en ts, n o r do es i t r e q u ir e th a t th e f eed ba c k fa ct o r s o f ea c h l o o p be eq ua l t o e a c h o t h e r . lo w f r e q uen c y o u t p u t b a la n c e is limi t e d u l t i ma tel y b y t h e misma t ch o f a n o n -chi p vo l t a g e di vider , w h i c h is tr imm e d fo r o p t i m u m pe r f o r m a n c e . o u t p u t b a lan c e is m e a s ur e d b y placin g a w e l l m a t c h e d r e sist o r divider acr o ss t h e dif f er en t i a l vol t a g e o u t p uts and co m p a r in g t h e sig n al a t t h e di v i der s mid p oin t w i t h t h e mag n i t ude o f t h e d i f f e r e n ti al o u t p u t . b y th i s d e f i ni ti o n , o u t p u t bala n c e i s eq ual t o t h e ma g n i t ude o f t h e cha n ge in o u t p u t co mm on- m o d e v o l t a g e divide d b y t h e ma g n i t ude o f t h e cha n ge i n o u tp u t dif f er en t i a l - mo d e vo lt ag e : dm o, cm o, v v balance output = ( 3 ) the b l o c k dia g r a m o f the ad81 39 in f i gur e 58 s h o w s t h e ext e r n al dif f er en t i al fe e d b a ck l o o p (r f /r g n etw o r k s a n d th e dif f er en t i al in put t r a n s c ond u c t an ce a m plif ier , g dif f ) a n d t h e in t e r n al co mm on-m o d e f e e d back lo o p (v ol ta g e divider acr o s s v op and v on and t h e co mm on- m o d e i n p u t t r an s c on d u c t ance a m plif ier , g cm ). the dif f er en t i al n e g a t i ve fe e d b a ck dr i v es t h e v o l t a g es a t t h e summin g j u n c t i o n s v an a nd v ap t o be ess e n t ial l y eq ual t o ea ch o t h e r . ap an v v = ( 4 ) th e co mm o n -mo d e fee d b a ck lo o p d r i v e s t h e o u t p u t co mm o n - m o de v o l t a g e , sa m p led a t th e mid p o i n t o f th e tw o 500 ? r e sis t o r s , t o e q ual t h e v o l t a g e s et a t t h e v oc m t e r m in a l . this en sur e s t h a t 2 dm o, ocm op v v v + = ( 5 ) a nd 2 dm o, ocm on v v v ? = ( 6 ) 04679- 0- 051 v op v ocm g o g diff g o g cm 10pf 10pf 500 ? 500 ? v on midsupply + + v an v in v ip v ap r g r g r f r f f i g u re 58. bl ock d i ag r a m
ad8139 rev. a | page 19 of 24 appli c a t ions estima ti ng noise, gai n , an d ban d wid t h with ma t c hed fee d ba ck ne t w o r ks estimating output noise voltage the t o t a l ou t p ut n o is e is calc u l a t e d as t h e r o o t -s um-s qua r e d to t a l o f s e ver a l st a t ist i ca l l y i n de p e nden t s o ur ce s. sin c e t h e s o ur ces a r e s t a t is tical l y in dep e nden t , t h e con t r i b u tio n s o f each m u s t be in d i v i d u all y i n c l uded in th e r o o t - s um -sq u a r e calcula - t i on . t a bl e 6 l i st s re c o m m e nd e d re s i stor v a lu e s an d e s t i m a te s o f b a ndwi d t h and o u t p ut dif f er en t i a l vol t a g e n o is e fo r va r i o u s c l os e d -lo o p ga in s. f o r m o s t a p p l ica t ion s , 1% resis t o r s a r e s u f f i cien t. ta ble 6. r e com m en de d va lues of ga i n -set t i ng res i s t ors a nd voltage noise for various clo s ed-loo p gains g a i n r g (?) r f (?) 3 db bandwidth (mhz) total output noise (nv/hz) 1 2 0 0 2 0 0 4 0 0 5 . 8 2 2 0 0 4 0 0 1 6 0 9 . 3 5 2 0 0 1 k 5 3 1 9 . 7 1 0 2 0 0 2 k 2 6 3 7 the dif f er en t i al o u t p ut v o l t a g e n o is e con t a i n s c o n t r i b u t i o n s f r o m t h e ad81 39 s in p u t v o l t a g e n o is e an d in pu t c u r r en t n o is e a s w e ll a s t h ose f r o m th e e x t e rnal f eed ba ck n etw o r k s . the co n t r i b u t i on f r o m t h e in p u t v o l t a g e n o is e sp e c t r al den s i t y is co m p ut e d as ? ? ? ? ? ? + = 1 1 , o r e q u i v a l e n t l y , v n / (7) w h er e v n is def i n e d as t h e i n p u t - r e fer r e d dif f er en t i al v o l t a g e n o i s e . t h i s eq ua ti o n i s t h e sa m e a s th a t o f tra d i t i o n a l o p a m ps . the co n t r i b u t i on f r o m t h e in p u t c u r r en t n o is e o f e a ch in pu t is co m p u t ed as ( ) = 2 ( 8 ) w h er e i n is def i ne d as t h e i n p u t n o is e c u r r en t o f o n e i n p u t. e a ch in p u t ne e d s t o b e t r e a t e d s e p a r a t e l y since t h e t w o in p u t c u r r en ts a r e s t a t i s t i cal l y i n de p e n d e n t p r o c es s e s. t h e c o n t r i but i o n f rom e a ch r g is co m p ut e d as ? ? ? ? ? ? = 4 3 ( 9 ) t h i s r e s u l t ca n b e i n t u i t i v e l y v i e w ed a s th e th e r m a l n o i s e o f ea c h r g m u l t i p lied b y th e m a gni t ud e o f th e d i f f er e n ti al g a i n . t h e c o n t r i but i o n f rom e a ch r f is co m p u t ed a s f ktr n vo 4 4 _ = ( 1 0 ) voltage g a in the b e ha vio r o f t h e n o de v o l t a g es o f t h e sin g le- e n d e d -t o- dif f er en t i a l ou t p u t to p o lo g y ca n b e d e d u ce d f r o m t h e p r e v io us def i ni t i on s. refer r in g to f i gur e 57, ( c f = 0) a nd s e t t in g v in = 0 o n e ca n wr i t e f on ap g ap ip r v v r v v ? = ? ( 1 1 ) ? ? ? ? ? ? + = = ( 1 2 ) s o lvi n g t h e ab o v e tw o e q ua t i o n s a nd s e t t i n g v ip to v i gi v e s th e ga in r e l a t i on s h i p fo r v o, d m / v i . i g f dm o, on op v r r v v v = = ? ( 1 3 ) an i n v e r t in g conf igura t io n w i t h t h e s a m e ga i n ma g n i t ude can be im p l em en t e d b y s i m p l y a p p l yi n g th e in p u t s i g n al t o v in and se t t in g v ip = 0. f o r a b a lan c e d dif f er en t i al in put, t h e ga i n f r o m v in, d m to v o, d m is als o eq ual t o r f / r g , w h er e v in, d m = v ip ? v in . fe ed ba ck fa ctor nota tion w h en w o rk in g wi t h d i f f er en t i a l a m plif iers, i t is co n v e n ien t t o i n tr od uce th e f eed ba ck fa ct o r , wh i c h i s d e f i n e d a s g f g r r r + = ( 1 4 ) t h i s n o t a ti o n i s co n s i s t e n t w i t h co n v en ti o n al f e ed ba ck a n al ys i s a nd is v e r y us ef u l , p a r t ic u l a r ly w h en t h e tw o fe e d b a ck lo o p s a r e not m a tc h e d. inp u t com m on-mode volt age the li n e a r ra n g e o f t h e v an an d v ap te r m i n a l s e x te nds to w i t h i n a p p r o x ima t e l y 1 v o f ei t h er s u pply ra i l . sin c e v an an d v ap are e s se n t i a ll y eq ual t o ea c h o t h e r , th ey a r e bo t h eq ual t o th e a m p l i- f i er s in p u t comm on- m o d e v o l t a g e . th eir ra n g e is indic a t e d i n t h e s p e c if ic a t ion s t a b l es as in pu t co mm on- m o d e ra n g e . the volt age a t v an and v ap f o r th e co n n ect i o n d i a g ra m in f i g u r e 57 ca n b e exp r es s e d as = = = ? ? ? ? ? ? + + ? ? ? ? ? ? + + 2 ) ( (15) w h er e v ac m is th e comm o n - m o d e v o l t a g e p r es en t a t t h e a m plif ier in p u t t e r m ina l s.
ad8139 rev. a | page 20 of 24 u s i n g th e n o ta t i o n , eq u a ti o n 1 5 c a n b e w r i t t e n a s ( ) icm ocm acm v v v ? + = 1 (16) or e q u i v a l e n t ly , ( ) icm ocm icm acm v v v v ? + = (17) w h er e v icm is t h e co mm o n - m o d e v o l t a g e o f t h e in p u t sig n al, i . e . , 2 in ip icm v v v + = . f o r p r o p er o p era t io n, t h e v o l t a g es a t v an an d v ap m u st st a y w i t h i n t h ei r r e s p ecti v e lin e a r ra n g e s . c a lc ulating in put im pe da nc e the i n p u t i m p e dan c e o f t h e circ ui t in f i gur e 57 wi l l de p e n d on w h et her t h e a m plif ier is b e in g d r i v en b y a sin g le -ende d o r a dif f er en t i al sig n al s o ur ce . f o r b a lan c e d dif f er en t i al i n p u t sig n als, t h e dif f er en t i a l i n p u t i m p e dan c e ( r in, d m ) is sim p l y g dm in, r r 2 = ( 1 8 ) f o r a s i ng l e - e nd e d s i g n a l ( f or e x am pl e, w h e n v in i s g rou nd e d a nd t h e i n p u t si g n al dr i v es v ip ), t h e i n p u t im p e dan c e b e com e s ) ( 2 1 f g f g in r r r r r + ? = ( 1 9 ) the i n p u t i m p e dan c e o f a con v en t i o n al i n ver t in g o p a m p co nf igura t io n is sim p ly r g , b u t i t is hig h er in e q ua tio n 19 b e ca us e a f r ac t i o n o f t h e dif f er en t i al o u t p u t v o l t a g e a p p e a r s a t t h e su m m i ng j u nc t i on s , v an a nd v ap . this v o l t a g e p a r t ia l l y b o o t s t ra ps t h e vol t a g e acr o s s t h e in p u t r e sis t o r r g , l e a d i n g t o th e in cr eased i n p u t r e s i s t a n ce . input common-mode swing consideratio ns i n s o me s i ng l e - e nd e d - t o - d i f f e r e n t i a l a p pl i c a t i o ns , w h e n u s i n g a s i n g le - s u p p l y v o l t a g e a t t e n t i o n m u s t be pa id t o th e swi n g o f th e in p u t co mm on- m o d e v o l t a g e , v ac m . c o n s ider t h e cas e in f i gur e 59, w h er e v in is 5 v p-p swin g i ng a b o u t a b a s e li n e a t g r o u nd and v ref i s c o n n e c te d to g rou nd. 04679-0-052 dgnd agnd refgnd ref refbufin pdbuf adr431 2.5v reference 47 f ad7674 in+ in? avdd dvdd ad8139 + ? 8 v ref 2.5v 2 1 6 3 4 5 v ocm 200 ? 200 ? 324 ? 324 ? 5v 20 ? 15 ? 15 ? v in 2.7nf 2.7nf 0.1 f 0.1 f 0.1 f 0.1 f +1.7v +0.95v v acm with v ref = 0 +0.2v +2.5v gnd ?2.5v f i gur e 5 9 . ad81 39 dr i v i n g ad76 74 , 18 -bi t , 80 0 ksp s a / d c o n v er te r
ad8139 rev. a | page 21 of 24 the cir c ui t has a dif f er en t i al ga in o f 1.6 a nd = 0.38. v icm has an a m pl itu d e of 2 . 5 v p - p a n d i s s w i n g i ng a b out g rou nd. u s i n g t h e r e s u l t s in e q ua t i on 16, t h e c o mm on- m o d e v o l t a g e a t t h e ad8139 s in p u ts, v ac m , is a 1.5 v p-p sig n a l s w i n g i n g ab o u t a bas e line o f 0.95 v . th e maxim u m n e ga ti v e exc u rsio n o f v ac m in th i s ca se i s 0. 2 v , wh i c h e x ceed s th e lo w e r i n p u t co mm o n -m od e volt age l i mi t . on e wa y t o a v o i d t h e in p u t comm on- m o d e s w i n g limi t a t i o n is to b i as v in an d v ref a t midsu p pl y . i n this cas e , v in is 5 v p-p swin g i n g abo u t a bas e lin e a t 2.5 v a nd v ref is conn e c te d to a lo w-z 2.5 v s o u r ce . v ic m n o w has a n am p l i t ude o f 2.5 v p-p a nd is swin g i n g abou t 2.5 v . u s in g t h e r e s u l t s in e q ua tion 17, v ac m is calcula t ed t o be eq ual t o v icm bec a u s e v oc m = v icm . th er efo r e , v ac m swin gs f r o m 1.25 v t o 3.7 5 v , whic h is w e l l wi thin t h e in p u t co mm on-m o d e v o l t a g e limi ts o f t h e ad8 139. an o t h e r b e n e f i t s e e n in t h is exa m ple is t h a t si n c e v oc m = v ac m = v icm no was t e d comm on- m o d e c u r r en t f l o w s. f i gur e 60 i l l u s t ra t e s h o w t o p r o v ide t h e lo w-z b i as v o lt ag e . f o r si t u a t io ns t h a t do n o t re qu i r e a pre c i s e re f e re nc e, a s i m p l e vo lt ag e d i v i d e r w i l l su f f i c e t o de ve lo p t h e i n p u t v o l t a g e t o t h e b u f f er . 04679-0-053 v in 0 v to 5v ad8139 + ? 8 2 1 6 3 4 5 v ocm 200 ? 324 ? 5v 200 ? 324 ? 0.1 f 0.1 f 10 f + ad8031 + ? 0.1 f 5v adr431 2.5v reference to ad7674 refbufin f i g u re 60. l o w-z 2 . 5 v buf f e r a n ot he r w a y to a v oi d t h e i n put c o m m on - m o d e s w i n g l i m i t a - tio n is t o us e d u al p o w e r s u p p lies o n the ad81 39. i n this cas e , t h e b i asin g c i r c ui t r y is n o t r e q u ir e d . bandwidth versus closed-l oop gain the ad8139 s 3 db ban d wid t h decr eas e s p r o p or tio n al l y t o in cr e a si n g clos e d -lo o p ga i n in t h e s a me w a y as a t r adi t io na l v o l t a g e fe e d b a ck o p era t io na l am plif ier . f o r clos e d -lo o p ga i n s gr ea t e r th a n 4, t h e b a n d w i d t h ob ta in ed f o r a s p eci f i c g a i n ca n b e es t i ma t e d as ) 300 ( , 3 , mhz r r r v db f f g g dm out + = ? ( 2 0 ) o r eq ui valen t l y , (300 mh z). this est i ma te assum e s a mi ni m u m 90 deg r e e phas e ma rg i n fo r t h e am plif ier lo o p , w h ich is a c o n d i t ion a p p r o a ch e d fo r ga in s gr ea t e r th a n 4. lo w e r g a i n s w i l l s h o w m o r e ba n d w i d t h th a n p r ed i c t e d b y th e eq ua ti o n d u e t o th e peaki n g p r od uced b y t h e lo w e r p h as e ma rg in. estimating dc errors p r ima r y dif f er e n tial o u t p u t o f fs et er r o r s in th e ad8139 a r e d u e t o t h r e e ma jo r c o m p on e n ts: t h e in p u t o f fs et v o l t a g e , t h e o f fs et b e tw e e n t h e v an a nd v ap in p u t c u r r en ts in t e rac t in g wi t h t h e f eed ba ck n e tw o r k r e s i s t a n ce s , a n d th e o f fse t p r od uce d b y th e dc v o l t a g e dif f er ence b e tw e e n t h e i n p u t and o u t p ut co mm o n - m o d e v o l t a g e s in co n j un cti o n wi th ma t c hi n g e r r o r s i n th e f eed ba c k ne t w or k . the f i rs t o u t p u t er r o r co m p o n e n t is calc u l a t e d as ? ? ? ? ? ? + = g g f io r r r v e vo 1 _ , o r e q u i v a l e n t l y a s v io / (21) w h er e v io is t h e i n p u t o f fs et v o l t a g e . th e in p u t o f fs et v o l t a g e o f t h e ad8139 is las e r tr imm e d a n d gu a r a n t eed t o be l e s s tha n 50 0 v . the s e cond er r o r is calc u l a t e d as ( ) f io g f f g g g f io r i r r r r r r r i e vo = ? ? ? ? ? ? + ? ? ? ? ? ? + = 2 _ (22) w h er e i io is def i n e d as t h e o f fs et b e tw e e n t h e two in p u t b i as c u r r en ts. the t h ir d er r o r v o l t a g e is c a lc u l a t e d as ) ( 3 _ ocm icm v v enr e vo ? ? = ( 2 3 ) w h er e en r is t h e f r ac t i o n al mi sma t ch b e tw e e n t h e tw o f eed ba ck r e s i s t o r s . the t o t a l dif f er en t i al o f fs et er r o r is t h e s u m o f t h es e t h r e e er r o r so u r c e s . othe r i m p a ct of mismat che s in the f e e dbac k n e tworks the i n t e r n al comm on- m o d e fe e d b a ck n e tw o r k wi l l s t i l l fo r c e th e o u t p u t v o l t a g e s t o r e m a i n b a la n c e d , ev en w h en th e r f /r g fe e d back n e t w orks a r e misma t ch e d . th e misma t c h wil l , h o w e v e r , ca use a g a i n e r r o r p r o p o r ti o n al t o th e f eed ba ck ne t w or k m i s m a t ch . r a t i o-ma t c hin g er r o r s in t h e ext e r n al r e sis t o r s wi l l deg r ade t h e a b ili t y t o r e ject co mm o n -m o d e sign als a t th e v an an d v in in p u t t e r m inals, m u ch t h e s a m e as w i t h a fo ur -r esis to r dif f er en ce am pl i f i e r m a d e f rom a c o n v e n t i on a l op am p . r a t i o - m a t c h i ng er r o r s wi l l als o p r o d uce a dif f er en t i al o u t p u t com p on e n t t h a t is eq ual t o t h e v oc m in p u t v o l t a g e t i m e s t h e dif f er en c e b e tw e e n t h e fe e d b a ck fac t o r s (s). i n m o st a pplica t ion s usin g 1% r e sist o r s, th i s co m p o n en t a m o u n t s t o a d i f f e r e n ti al d c o f fse t a t th e o u t p u t tha t is smal l eno u g h t o b e ig n o r e d .
ad8139 rev. a | page 22 of 24 driving a capaciti ve lo ad a pu rely c a p a c i t i ve l o a d w i l l re a c t w i t h t h e b o n d w i re a n d pi n ind u c t an ce o f t h e ad8139, r e su l t in g in hig h f r eq uen c y r i n g ing in t h e t r a n sie n t r e s p o n s e and los s o f phas e ma rg in. one w a y t o minimize this ef f e c t is t o p l ace a smal l r e sis t o r in s e r i es wi th ea c h o u t p u t t o b u f f e r th e loa d ca pa ci ta n c e , se e f i g u r e 6 a n d f i gur e 61. th e r e sis t o r a nd lo ad ca p a ci tan c e wil l f o r m a f i r s t- o r d er lo w-p a s s f i l t er ; t h er efo r e , t h e r e sis t o r val u e s h o u ld b e as smal l as p o s s ib le . i n s o m e cas e s, t h e ad cs r e q u ir e smal l s e r i es r e sisto r s to b e a dde d on t h eir i n p u ts. ?13 ?12 ?11 ?10 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 10m 100m 1g 5 04679-0-076 frequency (mhz) clo sed lo o p g ain (db) r s = 30.1 ? c l = 15pf r s = 60.4 ? c l = 15pf r s = 60.4 ? c l = 5pf r s = 0 ? c l, dm = 0pf r s = 30.1 ? c l = 5pf v s = 5v v o, dm = 0.1v p-p g = 1 (r f = r g = 200 ? ) r l, dm = 1k ? fi g u r e 6 1 . fr e q u e n c y r e s p o n s e f o r v a ri ous capa cit i ve l oad and s e r i es r e s i s t anc e t h e t y p i cal p e rf o r m a n c e ch a r a c t e ri s t i c s th a t i l l u s t ra t e tra n s i en t r e s p o n se v e r s u s th e ca pa ci ti v e loa d w e r e g e n e ra t e d u s i n g se ri e s re s i stor s i n e a ch output a n d a d i f f e r e n t i a l c a p a c i t i ve l o a d . layout c o ns id er ations sta n d a r d h i gh s p eed p c b la y o u t p r a c ti ce s s h o u ld be a d h e r e d t o w h en desig n in g wi t h t h e ad8139. a s o lid gr o u n d pla n e is r e co m - me nd e d an d go o d w i d e b a nd p o w e r sup p ly d e c o upl i ng ne t w or k s s h o u ld be p l a c ed as c l os e as pos s i b le t o th e s u p p l y p i n s. t o m i n i m i z e st r a y c a p a c i t a nc e a t t h e su m m i ng no d e s , t h e co p p er in al l la yers un der al l t r aces a nd p a ds t h a t co nne c t t o t h e su m m i ng no d e s shou l d b e re mo ve d. sm a l l a m o u n t s of st r a y s u mmi n g - n o d e ca p a c i t a n c e wi l l ca us e p e aking i n t h e f r e q uen c y re sp ons e , a n d l a r g e amou n t s c a n c a u s e i n st a b i l it y . i f s o m e st r a y s u m m i n g -n ode c a pa ci ta n c e i s un a v o i d a b l e , i t s ef f e ct s c a n be co m p en s a t e d f o r b y p l acin g smal l ca p a c i t o rs ac r o s s th e f e e d back re s i stor s . terminating a sing le-en d e d inp u t c o n t ro l l e d i m p e d a nc e i n te rc on ne c t i o ns are u s e d i n mo s t h i g h sp e e d sig n a l a pplica t ion s , an d t h e y r e q u ir e a t le ast on e li ne t e r m ina t ion. i n a n a l og a p plic a t i o n s , a ma t c h e d r e sist i v e t e r m ina t ion is gen e ra l l y place d a t t h e lo ad e nd o f t h e li n e . thi s secti o n d e als wi th h o w t o p r o p er l y t e rm i n a t e a si n g le - e n d ed in p u t t o the ad8139. the in p u t r e sis t a n c e p r es en t e d b y th e ad8139 in p u t cir c ui tr y is s e en i n p a r a l l el wi t h t h e ter m i n a t io n r e sisto r , and i t s lo ad in g ef fe c t m u s t b e t a k e n i n t o acco u n t. th e the v eni n e q ui v a len t cir c ui t o f t h e dr i v er , i t s s o ur ce r e sis t a n ce , an d t h e ter mina t i o n r e si s t a n ce m u s t all be in c l ud ed in th e calcula t i o n a s w e ll . a n exac t s o l u t i o n to t h e p r ob le m r e q u ir es t h e s o l u t i o n o f s e v e ral s i m u l t a n eo us alg e b r a i c eq ua ti o n s a n d i s b e y o n d th e sco p e o f t h is da t a sh e et. an i t er a t i v e s o lu t i o n is als o p o ssi b l e and sim p le r , es p e c i al ly co n s i d er in g t h e fac t t h a t st anda r d 1 % r e sis t o r val u es are ge ne r a l l y u s e d . f i gur e 62 s h o w s th e ad8139 in a uni t y-ga in conf igura t io n dr i v in g the ad6645, whic h is a 14-b i t hig h s p e e d ad c, and w i t h t h e f o l l ow i n g d i s c u s s i on , prov i d e s a go o d e x am pl e of how t o p r o v ide a p r op er t e r m ina t io n in a 50 ? e n viro nm e n t . the t e r m in a t ion r e sist o r , r t , in p a ral l e l wi t h t h e 268 ? in p u t r e sis t a n c e o f th e ad8139 cir c ui t (calc u la t e d usin g e q u a tio n 19) , yie l ds a n o v eral l in p u t r e sis t an c e o f 50 ? tha t is s e en b y t h e sig n al s o ur ce . i n o r d er t o ha v e ma t c h e d f e e d bac k lo o p s, eac h lo o p m u s t ha ve th e s a me r g i f th ey h a v e t h e s a m e r f . i n t h e i n pu t ( u pp e r ) l o op , r g is eq ual to th e 200 ? r e sis t o r in s e r i es wi t h t h e (+) in pu t pl us t h e p a ral l e l co m b i n a t ion o f r t an d t h e s o u r c e re s i st anc e of 5 0 ? . i n t h e upp e r l o op , r g is t h er efo r e eq ual t o 228 ?. the c l os es t s t a nda r d 1 % val u e to 228 is 226 ? a nd is us e d fo r r g in th e lo w e r lo o p . g r ea t e r accurac y co uld be achie v e d b y usin g tw o r e sist o r s in s e r i es t o ob t a in a r e sist an ce c l os er t o 228 ?. thin gs g e t m o r e co m p lic a te d w h e n i t com e s t o det e r m ini n g t h e fe e d b a ck r e sis t or val u es. th e am pli t ude o f t h e sig n al s o ur ce ge ne r a tor v s is t w o t i m e s t h e am p l i t ude o f i t s o u t p u t sig n al w h en ter mina t e d in 50 ?. th us, a 2 v p-p t e r m i n a t e d am pli t ude is p r o d uced b y a 4 v p-p am p l i t ude f r o m v s . the th e v eni n e q u i v a l e n t c i rc u i t of t h e s i g n a l s o u r c e an d r t m u s t be us e d w h en calc u l a t ing t h e clos e d -lo o p ga in b e c a us e i n t h e u p p e r lo o p r g is s p li t betw e e n t h e 200 ? r e sis t o r a nd t h e thev enin r e sis - t a nce lo okin g b a ck t o wa r d t h e s o ur ce . th e the v enin v o l t a g e o f th e s i gn al so ur ce i s gr ea t e r th a n th e s i gn al so ur ce o u t p u t v o l t a g e w h en ter mina t e d in 50 ? b e ca u s e r t m u s t al wa ys be g r ea t e r tha n 50 ?. i n this cas e , i t is 61.9 ? a nd t h e the v enin v o l t a g e a nd r e sis t an ce ar e 2.2 v p-p a n d 28 ?, r e s p ec ti v e l y . n o w the u p p e r in p u t b r an ch can be vie w ed as a 2.2 v p-p s o ur ce in s e r i es wi t h 228 ?. s i nce this is a uni t y - ga in a p p l ica t ion, a 2 v p-p dif f er en t i a l ou t p u t is r e q u ir e d , and r f m u s t t h eref o r e be 228 (2/2.2) = 206 ?. the c l os es t s t anda r d val u e t o t h is is 205 ?. w h en g e n e r a t i ng t h e t y p i cal p e r f o r ma n c e c h a r ac t e r i s t ics da t a , th e m e a s ur em en t s w e r e cali b r a t ed t o t a k e t h e ef f e ct s o f th e t e r m ina t ion s o n clos e d -lo o p ga i n in t o acco un t.
ad8139 rev. a | page 23 of 24 expose d pa ddle (ep) sin c e t h is is a si n g le-e n d e d - t o- dif f er en t i a l a p pl ica t ion on a sin g le s u p p ly , t h e in p u t co mm on- m o d e v o l t a g e swi n g m u st b e c h eck e d . f r o m f i gur e 62, = 0. 52, v oc m = 2.4 v , a n d v ic m is 1.1 v p-p s w in g i n g abo u t g r o u nd . u s in g e q u a tio n 16, v ac m is calc u l a t ed t o be 0.53 v p-p s w ing i n g a b ou t a bas e lin e o f 1.25 v , a nd t h e mi ni m u m n e ga t i ve exc u rsio n is a p p r o x i m a t ely 1 v . the so i c -8 and lfcs p p a ckag es ha v e an exp o s e d p a ddle on t h e u n derside of i t s b o d y . i n o r der t o achie v e t h e sp e c if ie d t h e r m a l re s i s t a n c e , it m u s t h a v e a g ood th e r m a l c o n n ecti o n t o o n e of t h e p c b pl anes . the ex p o s e d p a dd l e m u st b e s o l d ere d to a p a d o n t o p o f t h e boa r d tha t is co nn ec t e d t o a n inn e r pla n e wi t h s e v e ral t h er mal vias. 04679-0-054 ad8139 + ? 8 2 1 6 3 4 2.4v 2v p-p r t 61.9 ? 5 v ocm 200 ? 226 ? 205 ? 205 ? 25 ? 25 ? 0.01 f 0.01 f 0.01 f ain ain gnd c1 0.1 f c2 vref 0.1 f av cc dv cc 5v 3.3v ad6645 v s signal source 50 ? f i gur e 6 2 . ad81 39 dr i v i n g ad66 45 , 14 -bi t , 80 msp s /1 05 msp s a/d c o n v er te r
ad8139 rev. a | page 24 of 24 outline dimensions 0.25 (0.0098) 0.17 (0.0068) 0.25 (0.0098) 0.10 (0.0039) 1.27 (0.050) 0.40 (0.016) 0.50 (0.020) 0.25 (0.010) 1.75 (0.069) 1.35 (0.053) seating plane 4 1 5 . 00 ( 0 . 1 97) 4.90 (0.193) 4 . 80 ( 0 . 1 89) 4.00 (0.157) 3.90 (0.154) 3.80 (0.150) 1.27 (0.05) bsc 6.20 (0.244) 6.00 (0.236) 5.80 (0.228) 0.51 (0.020) 0.31 (0.012) coplanarit y 0.10 top view 2. 29 ( 0 . 092) bottom view (pins up) 2. 29 ( 0 . 0 9 2 ) 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-012 45 8 0 85 f i g u re 63. 8-l e ad s t anda r d s m a l l o u t l ine p a ckag e w i t h e x pos e d p a d [s oic/ep ], narro w body ( r d - 8-1) d im ensio n s sho wn i n m i l lim ete rs and ( i nch e s ) 1 ex po s e d pa d (b o t t o m v ie w) 0.50 bsc 0.60 max pin 1 indicator 1.50 ref 0.50 0.40 0.30 0.25 min 0.45 2.75 bsc sq top view 12 max 0.80 max 0. 65 t y p seating plane pin 1 indicato r 0.90 0.85 0.80 0.30 0.23 0.18 0.05 max 0.02 nom 0.20 ref 1.90 1.75 1.60 4 1.60 1.45 1.30 3.00 bsc sq 5 8 f i g u re 64. 8-l e ad l e ad f r a m e ch ip s c al e p a ck ag e [lfcs p ], 3 m m 3 m m b o dy (cp - 8- 2)d im e n s i ons s h o w n in m i ll im ete r s 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 ad8139ard C40c to +125c 8-lead small ou tline package (s oic) rd-8-1 ad8139ard-re el C40c to +125c 8-lead sm all ou tline package (s oic) rd-8-1 ad8139ard-re el7 C40c to +125c 8-lead sm all ou tline package (s oic) rd-8-1 ad8139ardz 1 C40c to +125c 8-lead small ou tline package (s oic) rd-8-1 ad8139ardz-reel 1 C40c to +125c 8-lead small ou tline package (s oic) rd-8-1 ad8139ardz-r eel7 1 C40c to +125c 8-lead small ou tline package (s oic) rd-8-1 AD8139ACP-R2 C40c to +125c 8-lead lead frame chip scale p a ckage (lfcsp) cp-8-2 heb ad8139acp-re el C40c to +125c 8-lead lead fra me chip scale p a ckage (lfcsp) cp-8-2 heb ad8139acp-re el7 C40c to +125c 8-lead lead fra me chip scale p a ckage (lfcsp) cp-8-2 heb ad8139acpz-r2 1 C40c to +125c 8-lead lead frame ch ip scale p a ckage (lfcsp) cp-8-2 heb ad8139acpz-reel 1 C40c to +125c 8-lead lead frame ch ip scale p a ckage (lfcsp) cp-8-2 heb ad8139acpz-r eel7 1 C40c to +125c 8-lead lead frame ch ip scale p a ckage (lfcsp) cp-8-2 heb 1 z = pb-free part. ? 2004 a n alo g devic e s, inc. all rig h ts res e rve d . t r ade m arks a n d re g i s - tered trade m arks are the property of their respective owners . d04679C0C 8/04(a)

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