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ultralow distortion, high speed 0.95 nv/ hz voltage noise op amp ad8099 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 . fea t ures ultralow noise: 0.95 n v / hz , 2.6 pa/ hz ultralow d istortion 2 nd harmonic r l = 1 k? , g = + 2 ?92 db @ 1 0 m hz 3 rd harmonic r l = 1 k? , g = +2 ?105 db @ 10 mhz high speed gbwp: 3.8 ghz C3 db bandwidth: 700 mh z ( g = + 2 ) 550 mh z ( g = + 10) slew rate: 475 v/s ( g = + 2 ) 1350 v/s ( g = +10) new p i no ut custom extern al compensation, gain range C 1 , +2 to +10 supply current : 15 ma offset voltage: 0.5 mv m a x wide s u pply voltage range: 5 v to 12 v applic a t io ns pre-amplifiers receivers instrumentation filters if and baseban d amplifiers a-to -d driver s dac bu ffers optical electronics c o nnec t i o n di a g r a m s disable 1 feedback 2 ?i n 3 +in 4 +v s 8 v out 7 c c 6 ?v s 5 04511-0-001 04511-0-002 1 feedback 2 ?in 3 +in ?v s 4 disable 8 +v s 7 v out 6 c c 5 f i g u re 1. 8-l e ad cs p (c p - 8) f i g u re 2. 8-l e ad so ic-e d (r d - 8) gener a l description the ad8099 is a n u l tralo w n o is e (0.95 nv/ hz ) a nd disto r t i o n (C92 db c @10 mh z) v o l t a g e f eed back o p am p , th e com b ina t ion o f whic h mak e i t idea l f o r 16- a nd 18-b i t sys t em s. th e ad809 9 fe a t ur es a ne w , hig h l y li n e a r , lo w n o i s e i n p u t s t a g e t h a t i n cr e a s e s t h e f u l l p o w e r b a nd w i d t h (fpb w) a t lo w ga i n s wi t h h i g h sle w ra t e s. ad i s p r op r i eta r y n e xt g e n e ra t i o n xfcb p r o c es s ena b les s u c h hig h p e r f o r ma n c e am p l if iers wi th r e l a ti vel y lo w p o w e r . the ad8099 f e a t ur es ext e r n al co m p ens a tion, which lets t h e us er s e t t h e ga i n b a ndwi d t h p r o d uc t. e x t e r n al c o m p en s a t i on al lo ws ga in s f r o m +2 t o +10 wi t h minima l trade-o f f in band- wid t h. th e ad8099 als o f e a t ur es a n extr eme l y hig h s l e w ra te o f 1350 v/s, g i vin g t h e desig n er f l exi b ili t y t o us e th e en t i r e dy n a m i c r a nge w i t h out t r a d i n g of f b a nd w i d t h or d i stor t i on . the ad8099 s e t t les t o 0.1 % in 18 n s a nd r e co vers f r o m o v er dr i v e i n 50 n s . the ad8099 dr i v es 100 ? lo ads a t b r e a k t hr o u g h p e r f o r ma n c e l e vel s wi t h on ly 1 5 ma of su p p l y c u r r e n t. w i t h t h e w i de su p p ly v o l t a g e ra n g e (5 v t o 12 v), lo w o f fs et v o l t a g e (0.1 mv typ), wide bandwid th (700 mh z f o r g = +2), a n d a gb wp u p t o 3.8 gh z, t h e ad8099 is desig n ed t o w o rk in a wide va r i ety o f ap p l i c at i o n s . the ad8099 is a v a i la b l e in a 3 mm 3 mm lead f r a m e c h i p s c a l e p a cka g e (l fcs p ) wi t h a n e w p i n o u t t h a t is sp e c if ic a l ly opt i m i z e d f o r h i g h p e r f or m a nc e, h i g h sp e e d a m pl i f i e r s . t h e ne w lfcs p p a cka g e and p i n o ut ena b le t h e b r e a k t hr o u g h p e r f o r ma n c e t h a t p r e v io usly wa s n o t achi e v a b l e wi t h am plif iers . the ad8099 is ra t e d t o w o rk o v er th e exten d e d ind u s t r i al t e m p era t ur e ra ng e , ?40c t o +125c. 04511-a - 013 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?130 ?40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?120 solid line ? second harmonic dotted line ? third harmonic g = +2 v out = 2v p-p v s = 5v r l = 1k ? f i gur e 3 . h a rm o n ic di stor ti on vs . f r eque nc y and gai n (soic )
ad8099 rev. b | page 2 of 28 table of contents specifications ..................................................................................... 3 specifications with 5 v supply ................................................. 3 specifications with +5 v supply ................................................. 4 absolute maximum ratings ............................................................ 5 maximum power dissipation ..................................................... 5 esd caution .................................................................................. 5 typical performance characteristics ............................................. 6 theory of operation ...................................................................... 15 applications ..................................................................................... 16 using the ad8099 ...................................................................... 16 circuit components ................................................................... 16 recommended values ............................................................... 17 circuit configurations .............................................................. 17 performance vs. component values ........................................ 19 total output noise calculations and design ......................... 20 input bias current and dc offset ........................................... 21 disable pin and input bias cancellation ............................. 21 16-bit adc driver ..................................................................... 22 circuit considerations .............................................................. 23 design tools and technical support ....................................... 23 outline dimensions ....................................................................... 25 ordering guide ............................................................................... 26 revision history 6/04data sheet changed from rev. a to rev. b change to general description ...................................................... 1 changes to maximum power dissipation section ...................... 5 changes to applications section .................................................. 16 changes to table 7.......................................................................... 24 changes to ordering guide .......................................................... 26 1/04data sheet changed from rev. 0 to rev. a inserted new figure 3................................................................... 1 changes to specifications ............................................................ 3 inserted new figures 22 to 34 ..................................................... 8 inserted new figures 51 to 55 ................................................... 14 changes to theory of operation section ................................ 16 changes to circuit components section................................. 17 changes to table 4...................................................................... 18 changes to figure 60.................................................................. 18 changes to total output noise calculations and design section........................................................................ 21 changes to figure 60.................................................................. 22 changes to figure 62.................................................................. 23 changes to 16-bit adc driver section ................................... 23 changes to table 6...................................................................... 23 additions to pcb layout section ............................................. 23 11/03revision 0: initial version
ad8099 rev. b | page 3 of 28 specifications specifications with 5 v supply t a = 25c, g = +2, r l = 1 k? to ground, unless otherwise noted. refer to figure 60 through figure 66 for component values and gain configurations . table 1. parameter conditions min typ max unit dynamic performance C3 db bandwidth g = +5, v out = 0.2 v p-p 450 510 mhz g = +5, v out = 2 v p-p 205 235 mhz bandwidth for 0.1 db flatness (soic/csp) g = +2, v out = 0.2 v p-p 34/25 mhz slew rate g = +10, v out = 6 v step 1120 1350 v/s g = +2, v out = 2 v step 435 470 v/s settling time to 0.1% g = +2, v out = 2 v step 18 ns noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 500 khz, v out = 2 v p-p, g = +10 C102/C111 dbc f c = 10 mhz, v out = 2 v p-p, g = +10 C84/C92 dbc input voltage noise f = 100 khz 0.95 nv/ hz input current noise f = 100 khz, disable pin floating 2.6 pa/ hz f = 100 khz, disable pin = +v s 5.2 pa/ hz dc performance input offset voltage 0.1 0.5 mv input offset voltage drift 2.3 v/c input bias current disable pin floating C6 C13 a disable pin = +v s C0.1 C2 a input bias current drift 3 na/c input bias offset current 0.06 1 a open-loop gain 82 85 db input characteristics input resistance differential mode 4 k? common mode 10 m? input capacitance 2 pf input common-mode voltage range C3.7 to +3.7 v common-mode rejection ratio v cm = 2.5 v 98 105 db disable pin disable input voltage output disabled <2.4 v turn-off time 50% of disable to < 10% of final v out , v in = 0.5 v, g = +2 105 ns turn-on time 50% of disable to < 10% of final v out , v in = 0.5 v, g = +2 39 ns enable pin leakage current disable =+5 v 17 21 a disable pin leakage current disable = C5 v 35 44 a output characteristics output overdrive recovery time (rise/fall) v in = -2.5 v to 2.5 v, g =+2 30/50 ns output voltage swing r l = 100 ? C3.4 to +3.5 C3.6 to +3.7 v r l = 1 k? C3.7 to +3.7 C3.8 to +3.8 v short-circuit current sinking and sourcing 131/178 ma off isolation f = 1 mhz, disable = low C61 db power supply operating range 5 6 v quiescent current 15 16 ma quiescent current (disabled) disable = low 1.7 2 ma positive power supply rejection ratio +v s = 4 v to 6 v, Cv s = C5 v (input referred) 85 91 db negative power supply rejection ratio +v s = 5 v, Cv s = C6 v to C4 v (input referred) 86 94 db
ad8099 rev. b | page 4 of 28 specifications with +5 v supply v s = 5 v @ t a = 25c, g = +2, r l = 1 k? to midsupply, unless otherwise noted. refer to figure 60 through figure 66 for component values and gain configurations . table 2. parameter conditions min typ max unit dynamic performance C3 db bandwidth g = +5, v out = 0.2 v p-p 415 440 mhz g = +5, v out = 2 v p-p 165 210 mhz bandwidth for 0.1 db flatness (soic/csp) g = +2, v out = 0.2 v p-p 33/23 mhz slew rate g = +10, v out = 2 v step 630 715 v/s g = +2, v out = 2 v step 340 365 v/s settling time to 0.1% g = +2, v out = 2 v step 18 ns noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 500 khz, v out = 1 v p-p, g = +10 C82/C94 dbc f c = 10 mhz, v out = 1 v p-p, g = +10 C80/C75 dbc input voltage noise f = 100 khz 0.95 nv/ hz input current noise f = 100 khz, disable pin floating 2.6 pa/ hz f = 100 khz, disable pin = +v s 5.2 pa/ hz dc performance input offset voltage 0.1 0.5 mv input offset voltage drift 2.5 v/c input bias current disable pin floating C6.2 C13 a disable pin = +v s C0.2 C2 a input bias offset current 0.05 1 a input bias offset current drift 2.4 na/c open-loop gain v out = 1 v to 4 v 76 81 db input characteristics input resistance differential mode 4 k? common mode 10 m? input capacitance 2 pf input common-mode voltage range 1.3 to 3.7 v common-mode rejection ratio v cm = 2 v to 3 v 88 105 db disable pin disable input voltage output disabled <2.4 v turn-off time 50% of disable to <10% of final v out , v in = 0.5 v, g = +2 105 ns turn-on time 50% of disable to <10% of final v out , v in = 0.5 v, g = +2 61 ns enable pin leakage current disable = 5 v 16 21 a disable pin leakage current disable = 0 v 33 44 a output characteristics overdrive recovery time (rise/fall) v in = 0 to 2.5 v, g = +2 50/70 ns output voltage swing r l = 100 ? 1.5 to 3.5 1.2 to 3.8 v r l = 1 k? 1.2 to 3.8 1.2 to 3.8 v short-circuit current sinking and sourcing 60/80 ma off isolation f = 1 mhz, disable = low C61 db power supply operating range 5 6 v quiescent current 14.5 15.4 ma quiescent current (disabled) disable = low 1.4 1.7 ma positive power supply rejection ratio +v s = 4.5 v to 5.5 v, Cv s = 0 v (input referred) 84 89 db negative power supply rejection ratio +v s =5 v, -v s = C0.5 v to +0.5 v (input referred) 84 90 db
ad8099 r e v. b | pa ge 5 o f 2 8 absolute maximum ra tings table 3. p a r a m e t e r r a t i n g supply v o ltage 12.6 v p o w e r di ssip a ti on s ee f i gur e 4 diff er en tia l i n put v o ltage 1.8 v diff er en tial i n put c u rr en t 10ma stor age t e mpera tur e C65c to +125c o p era t ing t e mper a tur e r a nge C40c to +125c l e ad t e mper a tur e r a nge (s older i ng 10 sec) 300c junc tion t e mpe r a tur e 150c s t r e s s es a b o v e t h os e list e d u nde r a b s o l u te m a xi m u m r a t i n g s ma y ca us e p e r m a n e n t dama ge to t h e de vi ce. t h is is a st r e ss r a t i ng on ly ; f u n c t i on a l op e r at i o n of t h e d e v i c e a t t h e s e or an y o t h e r con d i t ions 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 pl ie d . e x p o sur e t o a b s o l u te max i m u m r a t i ng co ndi t i on s fo r ex tende d p e r i o d s ma y a f fe c t de vice rel i a b i l i t y . ma ximum po wer dissip a tion the maxim u m s a f e p o w e r dis s i p a t io n in t h e ad8099 p a c k a g e is l i m i t e d b y t h e as soci a t ed ri se i n j u n c ti o n t e m p era t u r e (t j ) o n t h e di e . th e plas t i c e n c a ps u l a t i n g t h e die wi l l l o cal l y r e ach t h e j u n c tion t e m p er a t ur e . a t a p p r o x ima t e l y 150c, which is t h e gla s s tra n si ti o n t e m p e r a t ur e , t h e p l a s ti c w i ll c h a n g e i t s p r o p er t i es. e v en t e m p o r a r i l y exce e d in g t h is t e m p era t ur e l i mi t ma y cha n g e t h e s t r e s s es t h a t t h e p a cka g e exer ts o n t h e die , pe rm a n e n tl y shi f ti n g t h e pa ra m e tri c pe rf o r m a n c e o f th e ad8099. e x ceedin g a j u n c tion t e m p era t ur e o f 150c f o r a n ex tende d p e r i o d can r e su l t i n cha n ges in si l i con d e v i ces, po t e n t iall y ca usi n g fa il ur e . the s t i l l - a i r t h e r mal p r o p er t i es o f t h e p a cka g e and pcb ( ja ), t h e am b i e n t t e m p era t ur e ( t a ), a nd t h e to t a l p o w e r dissi p a t e d in t h e p a cka g e ( p d ) det e r m i n e t h e j u n c t i on t e m p er a t ur e o f t h e die. the j u n c t i on t e m p era t ur e ca n b e calc u l a t e d as ( ) ja d a j p t t + = the p o wer dis s i p a t e d in t h e p a cka g e ( p d ) is t h e s u m o f t h e q u ies c e n 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 v e fo r al l o u t p u t s. th e quies 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 t h e q u i e scen t curr en t ( i s ) . a ssu m i ng t h e l o a d ( r l ) i s re f e re nc e d to midsu p ply , t h e to t a l dr i v e p o w e r is v s /2 i ou t , s o me o f w h ich is dissi p a t e d in t h e p a cka g e and s o m e in t h e lo ad ( v ou t i ou t ). the dif f er en ce b e tw e e n t h e t o t a l dr i v e p o w e r and t h e lo ad p o w e r is t h e dr iv e p o w e r di ssi p a t e d in t h e p a ck a g e . p d = q u i e s c e n t po w e r + ( t o t a l d r i v e po w e r C l o a d po w e r ) () l 2 out l out s s s d r v C r v 2 v i v p ? ? ? ? ? ? ? ? + = r m s output vo lt age s s h ou l d b e c o ns i d e r e d . i f r l i s re f e re nc e d t o v s C, as in si n g le -s u p pl y o p era t i o n, t h en t h e t o t a l dr i v e p o w e r i s v s i ou t . i f t h e r m s sig n al le ve ls a r e indeter m i n a t e , con s ider t h e worst c a s e , w h e n v ou t = v s /4 fo r r l to mi dsupp l y : () ( ) l s s s d r / v i v p 2 4 + = in s i n g l e - s u p p l y o p e r at i o n w i t h r l re f e re nc e d to v s C, w o rs t cas e is v ou t = v s /2. air f lo w wi l l i n c r e a s e he a t diss i p a t io n, ef fe c t i v ely r e d u cin g ja . a l s o , m o r e m e ta l d i r e ct l y i n c o n t a c t w i th th e pa c k a g e l e a d s f r o m m e tal tra c e s , th r o ugh h o le s, gr o u n d , a n d p o w e r p l a n e s w i ll re d u c e t h e ja . s o lder in g t h e ex p o s e d p a ddle t o t h e g r o u nd pla n e sig n if ica n t l y r e d u ces t h e o v eral l t h er mal r e sis t a n ce o f t h e p a cka g e. c a r e m u st b e t a k e n to mini mi ze p a r a si t i c c a p a ci- t a n c es a t t h e i n p u t le ads o f hi g h sp e e d o p am ps, as dis c uss e d i n th e pc b l a y o u t secti o n . fi g u r e 4 s h ow s t h e m a x i m u m s a f e p o w e r d i s s ip at i o n i n t h e p a cka g e v e rs us t h e am b i e n t tem p era t ur e fo r t h e exp o s e d p a ddle (e-p ad) so i c -8 (70c/w), an d cs p (70c/w), p a c k a g es o n a jedec st anda rd 4-l a yer b o a r d . ja val u es a r e a p p r o x ima t ion s . 04511-0-115 ambient temperature (c) 120 ?40 ? 20 0 2 0 4 0 6 0 8 0 100 m a xim u m pow e r d i ssipa tion ( w at t s ) 0.0 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 lfcsp and soic f i gure 4. m a xi m u m p o wer d i s s i pat i on esd c a ution esd (elec t r o sta t i c dischar g e) sensitiv e devic e . ele c tr os ta tic char g e s as high as 4000 v r e adily ac cumula te on the human body and t e st eq uipmen t and can dischar g e wi thout det e c t ion. although this pr odu c t f e a tur es pr o p r i etar y esd pr otec tio n cir c u i tr y , per m anen t damage ma y oc cur on devic e s subjec ted to high ener gy elec tr o s ta tic dischar g es . ther ef o r e , p r ope r esd pr ecaution s ar e r e c o mmended to a v oid per f or m a nc e degrada t ion or l o ss of func tiona l it y .
ad8099 r e v. b | pa ge 6 o f 2 8 typical perf orm ance cha r acte ristics d e f a u l t c o nd i t i o ns : v s = 5 v , t a = 25c, r l = 1 k? tied t o g r o u nd unles s o t her w is e n o t e d . ref e r t o f i gur e 63 t h r o ug h f i gur e 6 6 f o r co m p on e n t va l u es a nd ga in co nf igura t io n s . frequency (mhz) normalize d clos e d -loop gain (db) 1 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 10 100 1000 04511-0-074 g = +20 g = +5 g = +2 g = +10 g = ? 1 v out = 0.2v p-p v s = 5v r load = 1k ? f i gur e 5 . 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 (soic ) frequency (mhz) closed- l oop gain ( d b) 1 7 10 9 8 14 13 12 11 16 15 17 10 100 1000 04511-0-076 g = +5 v s = 5v v out = 0.2v p-p r l = 100 ? , soic r l = 1k ? , soic r l = 100 ? , csp r l = 1k ? , csp f i gur e 6 . 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 l o a d resi sto r s frequency (mhz) closed- l oop gain ( d b) 6 5 4 3 2 1 10 9 8 7 11 1000 1 1 0 100 g = +2 v s = 5v r l = 1k ? +125c +85c ?40 c +25c 04511-0-098 v out = 0.2v p-p f i g u re 7. 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 t e mpe r at u r es (soic ) frequency (mhz) normalize d clos e d -loop gain (db) 1 ?10 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 10 100 1000 04511-0-073 g = +20 g = ? 1 g = +2 g = +5 g = +10 v out = 0.2v p-p v s = 5v r load = 1k ? f i gur e 8 . 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 ( c sp ) frequency (mhz) closed- l oop gain ( d b) 1 7 10 9 8 14 13 12 11 16 15 17 10 100 1000 04511-0-077 g = +5 r l = 1k ? v out = 0.2v p-p v s = 2.5v, csp v s = 2.5v, soic v s = 5v, soic v s = 5v, csp f i g u re 9. 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 s u p p ly v o lt ag es frequency (mhz) closed- l oop gain ( d b) 6 5 4 3 2 1 10 9 8 7 11 1000 1 1 0 100 g = +2 v s = 5v r l = 1k ? +125 c +25c ?4 0 c +85 c 04511-0-097 v out = 0.2v p-p f i g u re 10. 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 t e mper at ur es (cs p )
ad8099 r e v. b | pa ge 7 o f 2 8 frequency (mhz) closed- l oop gain ( d b) 1 9 10 18 19 16 14 12 17 15 13 11 20 10 100 1000 5pf, csp 5pf, soic 1pf, csp 1pf, soic 04511-0-104 g = +5 v s = 5v f i g u re 11. 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 capa cit i ve l oads frequency (mhz) norm alized closed- l oop gain ( d b) 1 1 0 100 1000 04511-0-011 1 ?1 0 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 g = +2 g = +5 g = +10 g = +20 v s = 5v v out = 2v p-p r load = 1k ? f i gur e 1 2 . 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 (soic ) 04511-0-009 frequency (mhz) closed- l oop gain ( d b) 1 5.5 10 100 6.5 6.4 6.3 6.2 6.1 6.0 5.9 5.8 5.7 5.6 v out = 200mv p-p v out = 1.4v p-p v s = 5v g = +2 r l = 150 ? f i g u re 13. 0. 1 db l at nes s (soic ) f 04511-0-080 frequency (mhz ) open-loop gain (db) open - l oop ph a se ( d egrees) 0.001 0.01 0.1 1.0 10 100 1000 ?10 40 0 10 50 60 20 30 70 80 90 ?180 ?105 ?165 ?150 ?90 ?75 ?135 ?120 ?60 ?45 ?30 v s = 5v r l = 1k ? uncompensated phase magnitude f i g u n s e r e 14. o p en l o op f r equ e nc y r e s p o frequency (mhz) norm alized closed- l oop gain ( d b) 1 1 0 100 1000 04511-0-012 2 ?9 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 v s = 5v v out = 2v p-p r load = 1k ? g = +5 g = +10 g = +20 g = +2 f i gur e 1 5 . 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 ( c sp ) 04511-0-008 frequency (mhz) closed- l oop gain ( d b) 1 5.5 10 100 6.5 6.4 6.3 6.2 6.1 6.0 5.9 5.8 5.7 5.6 v out = 200mv p-p v out = 1.4v p-p v s = 5v g = +2 r l = 150 ? f i g u re 16. 0. 1 d f l at nes s (csp ) b
ad8099 r e v. b | pa ge 8 o f 2 8 frequency (mhz) closed- l oop gain ( d b) 1 5 8 7 6 12 11 10 9 14 13 15 10 100 1000 04511-0-078 g = +5 v s = 5v v out = 2v p-p r l = 100 ? , soic r l = 1k ? , soic r l = 100 ? , csp r l = 1k ? , csp f i g u re 17. lar g e s i g n u s l oad r e s i s t ances al f r equenc y r e s p ons e f o r v a r i o frequency (mhz) inp u t imp e dance (k ? ) 1 0.001 10 100 1000 0.1 1.0 10.0 0.01 100.0 04511-0-105 v s = 5v g = +2 f i gure 18. input i m pedance v s . f r eque nc y frequency (mhz) outp ut imp e dance ( ? ) 0.1 0.01 1 10 100 100 0.1 1 1 0 1000 g = +2 g = +5 g = +10 v s = 5v 04511-0-100 f i gure 19. o u tput imped a n c e . f r eq uenc y for v a ri ous g a ins v s frequency (mhz) closed- l oop gain ( d b) 1 5 8 7 6 12 11 10 9 14 13 15 10 100 1000 04511-0-079 g = +5 r l = 1k ? v out = 2v p-p v s = 2.5v, csp v s = 2.5v, soic v s = 5v, csp v s = 5v, soic f i g u es ?8 0 ?4 0 ?6 0 ?2 0 ?5 0 ?7 0 ?3 0 ?1 0 r e 20. 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 s u p p ly v o lt ag frequency (mhz) off is olation (db) 0.1 ?9 0 1 1 0 100 1000 04511-0-094 soic csp g = +2 r l = 1k ? v s = 5v v dis = 0v f i gure 21. o ff isolation vs. f r eque nc y 04511-a - 008 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?120 ?50 ?100 ?90 ?80 ?70 ?60 ?110 solid lines ? second harmonics dotted line ? t h i r d h a r m o n i c s solid lines ? second harmonics r m o n i c s dotted lines ? t h i r d h a g = +5 v out = 2v p-p v s = 5v r l = 100 ? soic csp f i gur e 2 2 . ha rm onic d ti on vs . f r eque nc y i stor
ad8099 r e v. b | pa ge 9 o f 2 8 04511-a - 009 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?130 ?50 ?110 ?100 ?90 ?80 ?70 ?60 ?120 solid line ? second harmonic dotted line ? third harmonic g = +5 v out = 2v p-p v s = 5v r l = 1k ? f i g c ) u r e 2 3 . ha rm onic di stor ti on vs . f r eque nc y ( s o i 04511-a - 010 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?130 ?40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?120 solid lines ? second harmonics dotted line ? t h i r d h a r m o n i c s solid line ? second harmonic c dotted line ? t h i r d h a r m o n i g = +2 v out = 2v p-p v s = 5v r l = 1k ? f i gur e 2 4 . ha rm onic di s t o ti on vs . f r eque nc y (soic ) r 04511-a - 011 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?130 ?40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?120 solid line ? second harmonic dotted line ? t h i r d h a r m o n i c g = ? 1 v out = 2v p-p v s = 5v r l = 1k ? f i gur e 2 5 . ha rm onic di s t o ti on vs . f r eque nc y (soic ) r 04511-a - 012 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?130 ?50 ?110 ?100 ?90 ?80 ?70 ?60 ?120 solid line ? second harmonic dotted line ? third harmonic g = +5 v out = 2v p-p v s = 5v r l = 1k ? f i gur e 2 6 . ha rm onic di stor ti on vs . f r eque nc y ( c sp ) 04511-a - 013 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?130 ?40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?120 solid line ? second harmonic dotted line ? t h i r d h a r m o n i c g = +2 v out = 2v p-p v s = 5v r l = 1k ? f i gur e 2 7 . ha rm onic di stor ti on vs . f r eque nc y ( c sp ) 04511-a - 014 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?130 ?40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?120 solid line ? second harmonic dotted line ? t h i r d h a r m o n i c g = ? 1 v out = 2v p-p v s = 5v r l = 1k ? f i gur e 2 8 . ha rm onic di stor ti on vs . f r eque nc y ( c sp )
ad8099 rev. b | page 10 of 28 04511-a - 015 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?120 ?50 ?100 ?90 ?80 ?70 ?60 ?110 solid lines ? second harmonics dotted lines ? third harmonics g = +10 r l = 1k ? v s = 2.5v v out = 1v p-p v s = 5v v out = 2v p-p f i gur e 2 9 . g e ( s o i c ) h a rm onic di stor ti on vs . f r eq u e n c y an d s u ppl y v o l t a 04511-a - 016 output amplitude (v p-p) 7 1 234 56 harmonic dis t ortion (dbc ) ?110 ?40 ?90 ?80 ?70 ?60 ?50 ?100 solid line ? second harmonic dotted line ? third harmonic g = +5 v s = 5v f = 10mhz r l = 100 ? f i gur e 3 0 . ha rm onic di stor ti on vs . output a m pli t ude (soic ) 04511-a - 017 output amplitude (v p-p) 04511-a - 018 frequency (mhz) 0.1 1.0 10.0 harmonic dis t ortion (dbc ) ?120 ?110 ?50 ?90 ?80 ?70 ?60 ?100 solid lines ? second harmonics dotted line ? third harmonics solid lines ? second harmonics dotted lines ? third harmonics g = +10 r l = 1k ? v s = 2.5v v out = 1v p-p v s = 5v v out = 2v p-p f i gur c sp ) e 3 2 . ha rm onic di stor ti on vs . f r eque nc y fo r v a r i o u s suppli e s ( 04511-a - 019 output amplitude (v p-p) 7 1 23456 harmonic dis t ortion (dbc ) ?110 ?40 ?90 ?80 ?70 ?60 ?50 ?100 solid line ? second harmonic dotted line ? third harmonic g = +5 v s = 5v f = 10mhz r l = 100 ? f i gur e 3 3 . ha rm onic di stor ti on vs . output a m pli t ude ( c sp ) 04511-a - 021 output amplitude (v p-p) 7 1 2345 6 harmonic dis t ortion (dbc ) ?120 ?110 ?40 ?90 ?80 ?70 ?60 ?50 ?100 solid line ? second harmonic dotted line ? third harmonic g = +5 v s = 5v f = 10mhz r l = 1k ? f i gur e 3 4 . ha rm onic di stor ti on vs . output a m pli t ude ( c sp ) 7 12 34 56 harmonic dis t ortion (dbc ) ?120 ?110 ?40 ?90 ?80 ?70 ?60 ?50 ?100 solid line ? second harmonic dotted line ? third harmonic g = +5 v s = 5v f = 10mhz r l = 1k ? f i gur e 3 1 . ha rm onic di stor ti on vs . output a m pli t ude (soic )
ad8099 rev. b | page 11 of 28 time (ns) output voltage ( v ) 05 1 0 ?0.20 ?0.05 ?0.10 ?0.15 0.15 0.10 0.05 0 0.20 15 20 25 30 35 40 45 50 1pf 10pf, 20 ? r snub 04511-0-095 r snub c l r l g = +5 v s = 5v r l = 1k ? f i g u r oads (soic ) e 35. 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 capa cit i ve l time (ns) outp ut v o ltage (v ) 01 0 ? 0.15 ? 0.05 ? 0.10 0.10 0.05 0 0.15 20 30 40 50 g = +10 r l = 1k ? v s = 5.0v and 2.5v, soic v s = 5.0v and 2.5v, csp 04511-0-107 t r e s p o n f i g u re 36. sm a ll s i g n al t r ans i e n s e f o r v a r i ous s u p p ly v o lt ag es 04511-a - 017 time (ns) 1000 0 100 200 300 400 500 600 700 800 900 output voltage (v) ?5 5 4 3 2 1 0 ?1 ?2 ?3 ?4 r l = 1k ? r l = 100 ? input 2 f i gur e 3 7 . o u tput o v er dri v e rec v e r y fo r v a ri o u s r e si sti v e l o a d s o 04511-0-096 time (ns) output voltage ( v ) 05 1 0 ?0.20 ?0.05 ?0.10 ?0.15 0.15 0.10 0.05 0 0.20 15 20 25 30 35 40 45 50 10pf, 20 ? r snub 1pf r snub c l r l g = +5 v s = 5v r l = 1k ? f i g u re 38. 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 capa cit i ve l oads (c s p ) time (ns) outp ut v o ltage (v ) 01 0 ? 0.20 ? 0.05 ? 0.10 ? 0.15 0.15 0.10 0.05 0 0.20 20 30 40 50 r l = 1k ? , 100 ? v out = 200mv p-p g = +5 v s = 2.5v csp v s = 5.0v csp v s = 5.0v soic v s = 2.5v soic 04511-0-102 f i g u re 39. 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 s u p p ly v o lt ag es 04511-0-010 time (ns) output voltage (v) ?0.5 200 0 5 0 100 150 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 turn on turn on input turn off turn off input v s = 5v g = 2 f i g u re 40. d i s a b l e / e n able swit ch ing s p eed
ad8099 rev. b | page 12 of 28 time (ns) output voltage ( v ) 01 0 ? 1.5 ? 0.5 ? 1.0 1.0 0.5 0 1.5 20 30 40 50 g = +10 r l = 1k ? v s = 2.5v v s = 5.0v 04511-0-106 f i g u re 41. l lt ag e (csp ) a r g e s i g n al t r ans i ent r e s p ons e v s . sup p l y v o time (ns) output voltage (v) 01 0 ? 1.5 ? 0.5 ? 1.0 1.0 0.5 0 1.5 20 30 40 50 v s = 5.0v g = +10 r l = 1k ? v s = 2.5v 04511-0-118 f ) i g u re 42. lar g e s i g n al f r equenc y r e s p ons e v s . sup p l y v o lt ag e (soic time (ns) output voltage (v) 01 0 ? 1.5 ? 0.5 ? 1.0 1.0 0.5 0 1.5 20 30 40 50 r l = 1k ? , 100 ? g = +5 v s = 5v v s = 2.5v 04511-0-101 f i g d l o a d resi stanc e ( s o i c a n d c s p ) u re 43. lar g e s i g n al t r ans i ent r e s p ons e f o r v a r i ous s u p p ly v o lt ag es a n s 04511-0-052 time (ns) output/input voltage (v) 0 5 10 15 20 25 30 35 40 ? 1.5 ? 0.5 ? 1.0 0 0.5 1.0 1.5 ?0.3% ?0.1% ?0.2% 0% 0.1% 0.2% 0.3% 45 input error output g = +2 r load = 1k ? v s = 5v f i g u ) r e 4 4 . shor t t e rm s e ttl ing ti me ( c sp 04511-0-051 time ( n s) output/input voltage (v) 0 5 10 15 20 25 30 35 40 ?1.5 ?0.5 ?1.0 0 0.5 1.0 1.5 ?0.3% ?0.1% ?0.2% 0% 0.1% 0.2% 0.3% 45 g = +2 r load = 1k ? v s = 5v input error output f i gure 4 5 . shor t t e rm s e ttl ing ti me (soic ) 04511-0-050 time ( s) output/input voltage (v) 0 5 0 100 150 200 250 300 350 400 450 ?1.5 ?0.5 ?1.0 0 0.5 1.0 1.5 ?0.30% ?0.10% ?0.20% 0% 0.10% 0.20% 0.30% 500 input error output g = +2 v s = 5v f i gure 4 6 . l o ng t e rm s e ttl ing ti me
ad8099 rev. b | page 13 of 28 04511-0-113 frequency ( mhz) 1000 0.1 1.0 10 100 common-mode re j e ction (db) ?110 ?20 ?30 ?50 ?70 ?40 ?60 ?80 ?90 ?100 g = +2 r l = 1k ? fi g u r e 4 u e n c y 7 . c o m m o n - m o d e r e j e c t i o n v s . fr e q 04511-0-004 1 1 0 100 1k 10k 100k 1m 10m 100m 1g 1 10 100 1000 frequency (hz) inp u t curre nt nois e (pa hz) f i gure 48. input cu rr e n t no is e v . f r eq uenc y ( disab l e = o p en) s 04511-0-005 1 1 0 100 1k 10k 100k 1m 10m 100m 1g 0.1 1 10 1000 frequency (hz) in pu t volta ge n o ise ( n v h z ) fi g u r e 4 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 04511-0-114 frequency ( mhz) 1000 0.01 0.10 1.0 10 100 pow e r su pply r e jec t ion ( d b ) ?100 0 ?20 ?10 ?40 ?60 ?30 ?50 ?70 ?80 ?90 g = +5 r l = 1k ? positive negative f i gure 50. p o wer s u p p ly rej e c t ion vs. f r equ e nc y 04511-0-003 frequency (hz) inp u t curre nt nois e (pa hz) 1 1 0 100 1k 10k 100k 1m 10m 100m 1g 1 10 100 1000 f i gure 51. input cu rr e n t no is e v s . f r eq uenc y ( disab l e = + v s ) v offset ( v) count ?300 0 60 40 20 100 80 120 ?200 0 ?100 100 200 04511-0-075 v s = 5v n = 1,200 x = ? 70 v = 80 v x f i gure 52. input o f f s et v o ltag e d i strib u tion
ad8099 rev. b | page 14 of 28 04511-a - 003 temperature (c) 125 ?40 ? 25 ?10 5 20 35 50 65 80 95 110 offset volta ge ( v) ?200 400 200 100 300 0 ?100 v s =5 v v s = 5v f i gure 53. input o f f s et v o ltag e v s . t e m p er atu r e 04511-a - 004 temperature (c) 125 ?40 ? 25 ?10 5 20 35 50 65 80 95 110 bias curre nt ( a) ?6.6 ?5.4 ?5.8 ?6.0 ?5.6 ?6.2 ?6.4 i b +, v s = 5v i b +, v s =5 v i b ?, v s = 5v i b ?, v s =5 v f i gure 54. input b i a s current v s . t e mpe r ature ( disable pi n fl o a t i n g ) 04511-a - 005 temperature (c) 125 ? 4 0 ? 2 5 ? 1 0 ? 52 03 55 06 5 8 09 5 1 1 0 outp ut s a turation v o ltage ( v ) 1.12 1.24 1.20 1.18 1.22 1.16 1.14 +v s ?v out v s =5 v v s = 5v +v s ?v out ?v s +v out ?v s +v out f i g u re 55. 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 04511-a - 006 temperature (c) 125 ?40 ? 25 ?10 5 20 35 50 65 80 95 110 s u p p l y curre nt (ma) 8 20 16 14 18 12 10 v s =5 v v s = 5v f i gure 56. sup p l y current v s . t e mper at ur e 04511-a - 007 temperature (c) 125 ?40 ? 25 ?10 5 20 35 50 65 80 95 110 bias curre nt ( a) ?1.0 1.0 ?0.2 ?0.4 0 0.2 0.4 0.6 0.8 ?0.6 ?0.8 i b +, v s =5 v i b +, v s = 5v i b ?, v s =5 v i b ?, v s = 5v f i gure 57. input b i a s current v s . t e mpe r ature ( disable p i n = +v s )
ad8099 rev. b | page 15 of 28 theor y of opera tion the ad8099 is a v o l t a g e f e e d bac k o p a m p tha t em p l o y s a n e w h i ghl y lin e a r lo w n o ise in p u t s t a g e . w i t h th i s in p u t s t a g e , t h e ad8099 can achiev e bet t e r than 90 db dis t o r tio n f o r a 2 v p-p , 1 0 m h z out p ut s i g n a l w i t h an i n put re fe r r e d volt age noi s e of les s tha n 1 nv/ hz . this n o is e le v e l an d dist o r t i o n p e r f o r ma n c e has be e n p r e v io us ly ac hie v ab le o n ly wi t h f u l l y un com p en s a t e d a m p l if iers. the ad8099 ac hieves this leve l o f p e r f o r ma n c e fo r ga in s as lo w as +2. this n e w in p u t st a g e a l s o t r i p l e s t h e a c h i e v abl e sl e w r a te f o r c o m p ar ably c o m p e n s a te d 1 nv/ hz a m plif iers . the sim p lif i ed ad8099 t o p o lo g y is s h o w n in f i gur e 58. th e a m plif ier is a si n g le ga i n st a g e wi t h a un i t y ga i n o u t p u t b u f f er fa b r ic a t e d in analog de vices extra fas t co m p l i m e n t a r y b i p o la r p r o c es s (xfcb) . the ad8099 has 85 db o f o p en-lo o p ga in an d ma in t a in s p r e c i s io n sp e c if ica t io n s such as c m r r , ps r r , v os , a nd ? v os / ? t t o l e v e l s t h at a r e n o r m a l l y a s s o c i at e d w i t h t o p o log i es ha vin g tw o o r m o r e ga in s t a g es. buffer gm c c r1 r l v out 04511-0-060 f i gur e 5 8 . ad80 99 t o po lo gy the ad8099 can b e ext e r n al l y co m p ens a t e d do wn t o a ga in o f 2 thr o ug h t h e us e o f a n r c netw ork. a b o v e ga in s o f 15, n o ext e r - nal co m p en s a t i o n net w o r k is r e q u ir e d . t o r e al i z e t h e f u l l ga i n ba n d w id th p r o d uct o f th e a d 8099, n o pc b tra c e sh o u ld be c o nne c te d to or w i t h i n cl o s e pro x i m it y of t h e e x te r n a l c o m p e n - sa ti o n p i n f o r th e lo w e s t pos s i b le ca pa ci ta n c e . e x t e r n al co m p en s a tion al lo ws t h e us er t o o p t i mize t h e c l os e d - l o op re sp ons e f o r m i n i m a l p e a k i n g w h i l e i n c r e a s i ng t h e g a i n ba ndwid th p r o d uc t in hig h er gain s, lo w e r i n g dis t o r tio n er r o rs th a t a r e n o rm ally m o r e p r o m in en t w i th in t e rnall y co m p e n s a t e d p a r t s in hig h er ga in s. f o r a f i xe d ga in b a n d wi d t h, wideb a n d disto r t i o n p r o d uc ts w o u l d n o r m a l ly in cr e a s e b y 6 db go in g f r o m a c l os ed-l o o p ga in o f 2 t o 4. i n cr eas i n g t h e ga in bandwid t h p r o d uc t o f t h e ad8099 e l imina t es this ef f e c t wi th in cr easin g cl o s e d -l o o p g a i n . the ad8099 is a v a i la b l e in bot h a so i c and an lfcs p , eac h of w h ich has a t h e r ma l p a d fo r lo w e r o p era t i n g tem p er a t ur e. t o hel p a v o i d t h is p a d i n b o a r d la yo u t , b o t h p a ck a g es ha ve a n ex t r a output pi n on t h e opp o s i te s i d e of t h e p a ck age f o r e a s e i n c o n - ne c t i n g a fe e d b a ck ne t w or k to t h e i n put s . t h e s e c o n d ar y output p i n a l s o is ol a t es t h e in t e rac t ion o f a n y ca p a c i t i ve lo ad o n t h e o u t p ut an d s e lf- i nd uc t a n c e o f t h e p a ck a g e and b o n d w i r e f r o m t h e fe e d b a ck lo o p . w h ile usin g t h e s e conda r y o u t p ut fo r fe e d - b a ck, i n d u c t an c e in t h e p r ima r y o u t p u t w i l l no w he l p t o is ola t e c a p a c i t i ve l o a d s f r om t h e output i m p e d a nc e of t h e a m pl i f i e r . since t h e so i c has g r e a t e r i n d u c t a n c e in i t s o u t p u t , t h e so ic wil l dr i v e c a p a ci t i v e lo ads b e t t e r t h a n t h e lfc s p . u s in g t h e p r i m a r y o u t p u t f o r f eed ba c k wi t h bo th pa c k a g e s w i ll r e s u l t i n th e l f c s p d r i v in g ca pa ci ti v e lo a d bet t e r th a n t h e so i c . the lfcs p and so i c p i n o u t s ar e iden t i ca l , excep t fo r t h e rot a t i on of a l l pi ns c o u n te rcl o ck w i s e b y o n e pi n on t h e l f c s p . this is ol a t es t h e in p u ts f r o m t h e n e g a t i v e p o w e r su p p ly p i n, re mov i ng a m u tu a l ly i n d u c t ive c o upl i ng t h a t i s mo st prom i n e n t w h i l e dr ivin g he a v y lo ads. f o r t h is r e as o n , t h e lfcs p s e con d ha r m o n ic, w h i l e dr ivin g a h e a v y lo ad , is sig n if ica n t l y b e t t er th a n tha t o f t h e so i c . a thr e e-s t a t e in p u t p i n is p r o v ided o n t h e ad8 099 f o r a hig h im p e dan c e p o wer - do w n an d an o p t i o n a l i n p u t b i a s c u r r en t ca nce l la tion circ ui t. th e hig h im p e dan c e o u t p u t al lo ws s e v e ra l ad8099s t o dr iv e the s a m e ad c o r o u t p u t l i n e time in t e r - le a v e d . pu l l in g t h e di s a bl e pi n l o w a c t i v a te s t h e h i g h im p e dan c e st a t e. s e e t a b l e 5 fo r t h r e s h ol d le ve ls. w h e n t h e di s a bl e p i n is lef t f l o a tin g , t h e ad8099 o p era t es n o r m al l y . w i th th e di s a bl e p i n p u lled wi thi n 0. 7 v o f th e posi ti v e su p p ly , a n o p t i ona l in p u t b i as c u r r en t can c e l l a t i o n cir c ui t is t u r n ed o n , which lo w e rs t h e in p u t b i as c u r r en t to les s tha n 200 na. i n t h is m o de , t h e us er can dr i v e t h e ad809 9 wi t h a hig h dc s o ur ce i m p e dance a nd st i l l ma i n t a i n m i ni ma l ou t p ut r e fer r e d o f fs et wi t h o u t ha v i n g t o us e i m p e dan c e ma t c hi n g t e chniq u es. i n addi tion, t h e ad8099 ca n be ac-co u p l ed while s e t t in g t h e b i as p o in t o n t h e in pu t w i t h a h i g h d c im p e d a n c e n e tw o r k . t h e in p u t b i as c u r r e n t can c e l l a t i on cir c ui t wi l l doub le t h e i n p u t r e fer r e d c u r r en t n o is e, b u t t h is e f fe c t is minima l as lo n g as wi deb a n d im p e dan c e is k e p t lo w (s e e f i gur e 48 a nd f i gur e 51). a p a ir o f in ter n a l ly co nn e c te d dio d e s lim i ts t h e dif f er en t i a l v o l t a g e b e tw e e n t h e n o ni n v er t i n g in p u t and t h e i n v e r t in g in p u t o f th e ad8099. e a c h s e t o f dio d es has tw o s e r i es dio d es, whic h a r e co nn e c t e d i n a n t i -p a r al le l. this limi t s t h e dif f er en t i al v o l t a g e b e tw e e n t h e in p u ts t o a p p r o x ima t e l y 1.8 v . al l o f t h e ad8099 p i n s a r e es d p r o t ec t e d wi th v o l t a g e limi tin g dio d es co nn e c te d b e twe e n b o t h r a i l s. the p r o t e c t i on dio d e s can hand le 5 ma o f s t e a d y s t a t e c u r r en t. c u r r en ts sh o u ld b e l i mi t e d t o 5 ma o r les s t h r o ug h t h e us e o f a s e r i es limi t i n g r e sis t o r .
ad8099 rev. b | page 16 of 28 appli c a t ions using the ad8099 the ad8099 o f f e rs unr i valed no is e a nd dis t o r tio n p e r f o r ma n c e in lo w sig n a l ga i n co nf igura t io ns. i n lo w ga i n co nf igura t io n s (les s tha n 15), t h e ad8099 r e q u ir es ext e r n al co m p en s a tion. the amou n t of g a i n an d p e r f or m a nc e ne e d e d w i l l d e te r m i n e t h e co m p ens a tion netw o r k. u n derstan d in g th e s u b t let i es o f th e ad8099 g i v e s th e us er in sig h t o n h o w t o exac t i t s p e a k p e r f o r ma n c e . u s e t h e co m p on e n t va l u es a nd cir c ui t c o nf igur a t io n s sh o w n i n t h e a p plica t io n s s e c t io n as st a r t i n g p o in t s fo r desig n s. s p e c if ic cir c ui t a p plic a t i o n s wi l l dic t a t e t h e f i n a l co nf ig ur a t io n and va lue of y o u r c o m p on e n t s . circuit c o mponent s t h e c i rc u i t c o mp one n t s are re f e re nc e d i n f i g u r e 5 9 , t h e r e co mm ended n o nin v er tin g cir c ui t s c h e ma tic f o r th e ad8099. s e e t a b l e 4 fo r t y p i cal co m p on e n t va l u es an d p e r f o r ma n c e da t a . 1 8 4 7 5 3 6 2 ad8099 c5 0.1 f c c c f c1 c4 10 f c2 10 f c3 0.1 f r c r f r g r s r1 +v s ?v s v out disable 04511-0-061 v in f i gure 59. wideb a n d non i n v e r ting g a in c o nf igur ation (s oic ) r f and r g th e f eed ba c k r e s i s t o r a n d t h e ga i n se t r e s i s t o r det e r m i n e t h e no is e ga in o f t h e a m plif ier ; ty p i c a l r f val u es ra n g e f r o m 250 ? t o 499 ?. c f c re ate s a z e ro i n t h e l o op re sp ons e to c o mp e n s a te t h e p o l e c r e a te d b y t h e i n put c a p a c i t a nc e ( i nc lu d i ng st r a y c a p a c i t a nc e ) a nd t h e fe e d b a ck r e sisto r r f . c f he l p s r e d u ce hig h f r eq uen c y p e a k in g and r i ng in g i n t h e clo s e d -lo o p r e sp on s e . t y p i ca l r a n g e is 0.5 pf t o 1.5 pf f o r eval ua tion cir c ui ts us ed h e r e . r1 this r e sisto r t e r m ina t es t h e in pu t o f t h e am plif ier t o t h e s o ur ce r e sis t a n c e o f th e sig n al s o ur ce , typ i c a l l y 50 ?. (this is a p plic a t ion sp e c if ic a nd n o t a l w a y s r e q u ir e d .) r s m an y hig h sp e e d am plif iers in lo w ga in conf igura t io n s r e q u ir e t h a t t h e in p u t st a g e b e ter m ina t e d in t o a n o mina l im p e dan c e t o m a in t a in st ab i l i t y . the va l u e o f r s shou l d b e ke pt t o 50 ? o r lo w e r t o ma in tain lo w n o is e p e r f o r ma n c e . a t hig h er ga in s, r s ma y b e r e d u ce d o r e v en e l im ina t e d . t y p i ca l ra n g e is 0 ? t o 50 ?. c c t h e co m p en sa ti o n ca pa ci t o r d e cr ea se s th e o p e n - l oo p ga i n a t hig h er f r e q uen c ies w h er e t h e phas e is deg r adi n g. by de cr e a s- in g t h e op en -lo o p ga in h e r e , t h e phas e ma rg in is in cr e a s e d and t h e am plif ier is st a b i l i z e d . t y p i c a l ra n g e is 0 pf t o 5 pf . th e val u e o f c c is gain d e p e nden t . r c th e s e r i es l e ad i n d u c t an c e o f t h e p a cka g e and t h e com- pe n s a t i o n c a pa ci ta n c e ( c c ) f o rm s a se ri e s r e so n a n t c i r c ui t . r c dam p e n s t h is r e s o na nce an d p r e v en ts o s ci l l a t i on s. t h e r e co mm e nde d va l u e o f r c is 50 ? fo r a clos e d -lo o p ga in o f 2. t h i s re s i stor i n t r o d u c e s a z e ro i n t h e op e n - l o o p re sp ons e a n d m u s t be k e p t lo w s o tha t this zer o o c c u rs a t a hig h er f r eq uen c y . the p u r p os e o f t h e co m p en s a t i o n net w o r k is to de cr e a s e t h e o p en-l o o p ga in. i f t h e r e sis t an c e b e com e s t o o l a rg e , t h e ga in w i l l be r e d u ced t o th e r e sis t o r val u e, a nd n o t n e ces s a r il y t o 0 ?, which is wha t a sin g le c a p a ci t o r w o u l d do o v er f r eq uen c y . t y p i cal va l u e ran g e is 0 ? t o 50 ?. c1 t o lo w e r t h e im p e dan c e of r c , c1 is p l ace d in p a ral l e l wi t h r c . c1 is n o t r e q u ir e d , b u t g r e a t l y r e d u ces p e a k in g a t lo w clos e d -lo o p ga i n s. th e typ i c a l val u e ra n g e is 0 pf t o 2 pf . c2 and c3 b y p a s s c a p a c i tors are c o nne c te d be t w ee n bo t h suppl i e s f o r opt i m u m d i s t or t i on an d p s r r p e r f or m a nc e. t h e s e ca p a ci t o rs sh o u l d b e place d as cl os e as p o ssi b l e to t h e su p p ly p i n s o f t h e am pl if ier . f o r c3, c5 , a 0508 cas e s i ze s h o u l d b e us ed . th e 0508 cas e size o f f e rs r e d u ced ind u c t an ce and bet t er fr e q u e n c y r e s p o n s e . c4 and c2 e l e c t roly t i c b y p a ss c a p a c i tors .
ad8099 rev. b | page 17 of 28 rec o mmended v a l u es table 4. r e com m ende d values and ad809 9 p e rformance f eedback net w o r k v a l u e s c o mpensa tion net w o r k v a l u e s g a i n p a ck a g e r f r g r s c f r c c c c1 ?3 db ss band wid t h (mhz) slew r a te (v / s) p eak ing (db) o u tput noise ( ad8 099 o n ly) (nv/ hz ) t o tal o u tput noise including resis t o rs (nv/ hz ) ?1, 2 soic 250 250 50 1.5 50 4 1.5 440/700 515 0.3/3.1 2.1 4 2 c s p 2 5 0 2 5 0 5 0 0 . 5 5 0 5 2 7 0 0 4 7 5 3 . 2 2 . 1 4 ? 1 c s p 2 5 0 2 5 0 5 0 1 . 0 5 0 5 2 4 2 0 4 7 5 0 . 8 2 . 1 4 5 c s p / s o i c 4 9 9 1 2 4 2 0 0 . 5 5 0 1 0 5 1 0 7 3 5 1 . 4 4 . 9 8 . 6 1 0 c s p / s o i c 4 9 9 5 4 0 0 0 0 . 5 0 5 5 0 1 3 5 0 0 . 8 9 . 6 1 3 . 3 2 0 c s p / s o i c 4 9 9 2 6 0 0 0 0 0 1 6 0 1 4 5 0 0 1 9 2 3 . 3 circuit c o nfigur a t ions f i gur e 60 thr o u g h f i gur e 66 sho w typ i cal s c hema tics f o r th e ad8099 in va r i o u s ga in co nf ig ura t io n s . t a b l e 4 da ta was co llect e d usi n g th e sch e m a ti cs sh o w n in f i gur e 60 th r o ugh f i g u re 6 6 . r e s i s t or r 1 , a s s h ow n i n f i g u re 6 0 t h rou g h f i g u re 6 6 , i s t h e te st e q u i pme n t te r m i n a t i o n re s i stor . r 1 is n o t re qu i r e d f o r n o r m al o p er a t io n, b u t is sh o w n in t h e s c h e ma tics f o r co m p let e n e s s . 1 8 4 7 5 3 6 2 ad8099 c5 0.1 f c c 4pf c f 1.5pf c1 1.5pf c4 10 f c2 10 f c3 0.1 f r c 50 ? r f 250 ? r g 250 ? r s 50 ? r1 50 ? +v s ?v s v out 04511-0-116 v in r l 1k ? disable f i gure 60. a m pl ifi e r co nfigur ati o n fo r soic p a ckage , g a i n = C1 1 8 4 7 5 3 6 2 ad8099 c5 0.1 f c c 4pf c f 1.5pf c1 1.5pf c4 10 f c2 10 f c3 0.1 f r c 50 ? r f 250 ? r g 250 ? r s 50 ? r1 50 ? +v s ?v s v out 04511-0-054 v in r l 1k ? disable f i gure 61. a m pl ifi e r co nfigur ati o n fo r soic p a ckage , g a i n = +2 2 1 5 8 6 4 7 3 ad8099 c5 0.1 f c c 5pf c f 1pf c1 2pf c4 10 f c2 10 f c3 0.1 f r c 50 ? r f 250 ? r s 50 ? +v s ?v s v out 04511-0-108 r g 250 ? r1 50 ? v in rl 1k ? disable f i gure 62. a m pl ifi e r co nfigur ati o n fo r csp p a ck ag e , g a i n =C 1 2 1 5 8 6 4 7 3 ad8099 c5 0.1 f c c 5pf c f 0.5pf c1 2pf c4 10 f c2 10 f c3 0.1 f r c 50 ? r f 250 ? r g 250 ? r s 50 ? r1 50 ? +v s ?v s v out 04511-0-053 v in r l 1k ? disable f i gure 63. a m pl ifi e r co nfigur ati o n fo r csp p a ck ag e , g a i n = + 2
ad8099 rev. b | page 18 of 28 fb ad8099 c5 0.1 f c c 1pf c f 0.5pf c4 10 f c2 10 f c3 0.1 f r c 50 ? r f 499 ? r g 124 ? r s 20 ? r1 50 ? +v s ?v s v out 04511-0-055 v in r l 1k ? ? + d ?v c c v o +v disable f i g u re 64. a m pl if i e r co nf ig ur at i o n f o r csp and soic p a ckag e , g a in = + 5 ad8099 c5 0.1 f c c 0.5pf c4 10 f c2 10 f c3 0.1 f r f 499 ? r g 54 ? r1 50 ? +v s ?v s v out 04511-0-056 v in r l 1k ? fb ? + d ?v c c v o +v disable f i g u re 65. a m pl if i e r co nf ig ur at i o n f o r csp and soic p a ckag es, g a in = + 1 0 ad8099 c5 0.1 f c4 10 f c2 10 f c3 0.1 f r f 499 ? r g 26 ? r1 50 ? +v s ?v s v out 04511-0-057 v in r l 1k ? fb ? + d ?v c c v o +v disable f i g u re 66. a m pl if i e r co nf ig ur at i o n f o r csp and soic p a ckag es, g a in = + 2 0
ad8099 rev. b | page 19 of 28 performance v s . c o mponent v a l u es the inf l uen c e t h a t each co m p on en t has on t h e ad8099 f r eq uen c y r e s p o n s e can be s e en in f i gur e 67 and f i gur e 68. i n f i gur e 67 an d f i gur e 68, al l co m p on en t va l u es a r e h e l d co n s t a n t , except fo r t h e i n di v i d u al co m p on en t s h o w n, w h ich is va r i e d . f o r exa m ple , i n t h e r s p e r f or m a nc e pl ot of f i g u re 6 8 , a l l co m p o n en t s a r e h e l d co n s ta n t ex ce p t r s , w h ich is va r i e d f r o m 0 ? t o 50 ?.; a nd c l ea rl y in dic a tes tha t r s has a ma j o r inf l ue n c e o n p e ak in g and ba ndwid th o f t h e ad8099. 1 8 4 7 5 3 6 2 ad8099 c5 0.1 f c c c f c1 c4 10 f c2 10 f c3 0.1 f r c r f r g r s r1 +v s ?v s v ou t soic pinout shown v in disable 04511-0-117 frequency (mhz) closed- l oop gain ( d b) ?2 3000 04511-0-020 1 1 0 100 1000 9 8 7 6 5 4 3 2 1 0 ?1 v s = 5v g = +2 r load = 1k ? soic package c1 = 0pf c1 = 2pf c1 = 1.5pf frequency (mhz) closed- l oop gain ( d b) ?1 3000 04511-0-024 1 1 0 100 1000 10 9 8 7 6 5 4 3 2 1 0 c c = 3pf c c = 4pf c c = 5pf v s = 5v g = +2 r load = 1k ? soic package frequency (mhz) closed- l oop gain ( d b) ?1 3000 04511-0-030 1 10 8 9 7 6 5 4 3 2 1 0 v s = 5v g = +2 r load = 1k ? soic package 10 100 1000 r c = 50 ? r c = 35 ? r c = 20 ? f i gur e 6 7 . f r equenc y resp o n se for v a ri o u s v a l u es o f c 1 , c c , r c
ad8099 rev. b | page 20 of 28 frequency (mhz) closed- l oop gain ( d b) ?1 3000 04511-0-032 1 10 8 9 7 6 5 4 3 2 1 0 v s = 5v g = +2 r load = 1k ? soic package 10 100 1000 r f = r g = 200 r f = r g = 250 r f = r g = 300 frequency (mhz) closed- l oop gain ( d b) 10 9 8 7 6 5 4 3 2 1 100 1000 3000 04511-0-058 1 ?1 0 10 c f = 1pf c f = 0.5pf c f = 1.5pf v = 5v s g = +2 r load = 1k ? soic package frequency (mhz) closed- l oop gain ( d b) 0 10000 04511-0-034 1 12 10 11 9 8 7 6 5 4 3 2 1 v s = 5v g = +2 r load = 1k ? soic package 10 100 1000 r s = 0 r s = 50 r s = 20 1 8 4 7 5 3 6 2 ad8099 c5 0.1 f c c c f c1 c4 10 f c2 10 f c3 0.1 f r c r f r g r s r1 +v s ?v s v ou t soic pinout shown v in disable 04511-0-117 f i gur e 6 8 . f r equenc y resp o n se for v a ri o u s v a l u es o f r f , c f , r s t o t a l ou tput noise c a l c ul a t ions and des i gn t o a n al yze t h e n o is e p e r f o r ma n c e o f an a m pl if ier cir c ui t, t h e indivi d u a l n o is e s o ur ces m u st b e ide n t i f i e d . t h en de t e r m i n e if t h e s o ur ce has a sig n if ican t co n t r i b u t i o n t o o v er a l l n o is e p e r f o r - ma n c e o f t h e am plif ier . t o sim p lif y t h e n o is e c a lc u l a t io n s , w e w i ll w o r k w i th n o i s e s p e c t r a l d e n s i t i e s , r a th e r th a n a c t u a l v o l t a g es t o le a v e b a ndwi d t h o u t o f t h e exp r es sion s (n o i s e sp e c t r a l d e n s i t y , w h ich is genera l l y exp r ess e d in nv/ hz , is e q ui vale n t t o t h e n o is e i n a 1 h z b a n d wi d t h). t h e noi s e mo d e l sh ow n i n fi g u re 6 9 h a s s i x i n d i v i du a l noi s e s o ur ces: t h e j o hn s o n n o is e o f t h e t h r e e r e sis t o r s, t h e o p am p v o l t a g e n o is e , and t h e c u r r en t n o is e in e a ch in p u t o f t h e a m plif ier . e a ch n o is e s o ur ce ha s i t s o w n co n t r i b u t i on t o t h e n o is e a t t h e o u t p u t . n o is e is ge n e ra l l y sp e c if ie d r t i (r efer r e d t o in p u t), b u t i t is o f t e n si m p ler t o ca lc u l a t e t h e no is e r e fer r e d t o t h e ou t p u t (r to) a nd t h en div i de b y t h e n o is e ga in t o ob t a i n th e r t i n o is e . al l r e sis t o r s ha ve a j o hn s o n n o is e o f (4kb tr) , w h er e k is b o l t zmann s c o n s tan t (1.38 10 C23 j/k), t is t h e a b s o l u te t e m p era t ur e i n k e lv in, b is t h e b a ndwi d t h in hz, an d r is t h e r e sist a n ce in oh m s . a si m p le r e l a t i o n shi p , w h ich is e a sy t o re me mb e r , i s t h a t a 5 0 ? re s i sto r ge ne r a te s a j o h n s o n noi s e of 1 nv hz at 2 5 c. the ad8099 am p l if ier has r o ug hl y the s a m e e q ui va le n t n o is e as a 50 ? r e sist o r .
ad8099 rev. b | page 21 of 28 04511-0-070 gain from "b" to output =? r2 r1 gain from "a" to output = noise gain = ng = 1 + r2 r1 i n? v n v n, r1 v n, r3 r1 r2 i n+ r3 4ktr2 4ktr1 4ktr3 v n, r2 b a v n 2 + 4ktr3 + 4ktr1 r2 2 r1 + r2 i n+ 2 r3 2 + i n? 2 r1 r2 2 + 4ktr2 r1 2 r1 + r2 r1 + r2 rti noise = rto noise = ng rti noise v out + f i g u re 69. o p a m p nois e a n a l y s is m o d e l i n a p plic a t io n s w h er e n o i s e s e nsi t ivi t y is cr i t ic a l , ca r e m u st b e t a k e n n o t t o i n t r o d uce o t h e r si g n if ica n t n o is e s o ur ces t o t h e a m plif ier . e a ch r e sist o r is a n o is e s o ur ce . a t t e n t io n t o t h e fol l o w in g a r e a s is cr i t ica l t o ma i n t a i n lo w n o i s e p e r f o r ma n c e: desig n , la yo u t , and co m p o n e n t s e le c t ion. a su m m a r y o f n o is e p e r f o r ma n c e fo r t h e am plif ier and ass o c i a t e d r e sist o r s ca n b e see n i n t a b l e 4 . input bias current and dc offset i n h i g h n o is e gain co nf igura t ion s , t h e ef fe c t s o f o u t p u t o f fs et v o l t a g e can b e s i g n if ican t, e v e n wi t h lo w i n p u t b i a s c u r r en ts and in p u t o f fs et v o l t a g es. f i gur e 70 s h o w s a com p r e h e n s iv e o f fs et v o l t a g e m o de l , wh i c h ca n b e us ed t o d e t e rm in e th e r e f e rr ed t o o u t p ut (r t o ) of fs et v o l t a g e o f t h e am plif ier o r r e fer r e d t o in p u t (r t i ) o f fset v o l t a g e . 04511-0-071 gain from "b" to output =? r2 r1 gain from "a" to output = noise gain = ng = 1 + r2 r1 i b? v os r1 r2 i b+ r3 b a offset (rto) = v os 1 + r2 + i b+ r3 1 + r2 ? i b? r2 r1 r1 offset (rti) = v os + i b+ r3 ? i b? r1 r2 r1 + r 2 offset (rti) = v os if i b+ = i b? and r3 = r1 r2 r1 + r 2 v out for bias current cancellation: f i g u re 70. o p a m p t o t a l o f f s et v o lt ag e m o d e l f o r r t o calc u l a t io n s , t h e in p u t o f fs et v o l t a g e and t h e v o l t a g e g e n e ra t e d b y t h e b i as c u r r en t f l o w in g t h r o ug h r3 a r e m u l t i p lie d b y t h e n o is e gain o f t h e a m pl if ier . the v o l t a g e g e n e ra t e d b y i bC t h r o u g h r 2 i s s u m m e d t o g e th e r w i th th e p r e v i o u s o f f s e t v o l t a g es t o a r r i v e a t a f i nal o u t p u t o f fs et v o l t a g e. the o f fs et vol t a g e can a l s o b e r e fer r e d to t h e in pu t (r ti) b y divi di n g t h e calc u l a t e d o u t p u t o f fs et v o l t a g e b y t h e n o is e ga i n . a s s een in f i gur e 70 if i b+ a nd i bC a r e t h e s a m e and r3 e q uals t h e p a ral l e l co m b ina t io n o f r1 and r2, t h en t h e r t i o f fs et v o l t a g e ca n b e r e d u ce d to o n ly v os. this is a co m m o n m e t h o d us e d t o r e d u ce o u t p u t of fs et v o l t a g e . k e ep in g r e sis t an ce s lo w he l p s t o minimi ze o f fs et er r o r v o l t a g e a nd k e eps t h e v o l t a g e n o is e lo w . disable pin an d in put bias c a ncell a tio n the ad8099 di s a bl e pi n p e r f or ms t h re e f u nc t i ons ; e n a b l e , dis a b l e, a nd r e d u c t io n o f t h e i n p u t b i as c u r r en t . w h e n t h e di s a bl e p i n is b r o u g h t to wi t h in 0.7 v of th e p o si ti v e su p p l y , t h e i n put bi a s c u r r e n t i s re du c e d b y a n a pprox i m a t e f a c t or of 6 0 . h o w e v e r , t h e i n p u t c u r r en t n o is e do ub les t o 5.2 pa/ hz . t a b l e 5 o u t l i n es t h e di s a bl e pi n f u nc t i on a l it y . table 5. disable pin t r uth table supply vo ltage 5 v +5 v disable C5 to +2.4 0 to 2.4 e n a b l e o p e n op e n l o w i n put bias c u r r en t 4.3 to 5 4.3 to 5
ad8099 rev. b | page 22 of 28 8 1 4 7 5 3 6 2 ad8099 ad7667 c4 10 f c c 9pf c1 2pf c5 0.1 f c1 10 f c2 0.1 f r c 50 ? r f 150 ? r g 150 ? r s 50 ? r1 590 ? r2 590 ? +v s ?v s disable v in 04511-0-072 in refgnd ref ingnd agnd avdd dgnd dvdd dvdd c6 2.7nf r7 15 ? avdd 1 f 47 f ref 0.1 f 0.1 f +2.5v f i g u re 71. a d c d r iver 16-bit adc driver u l tralo w n o is e a nd dist o r tio n p e r f o r ma n c e ma k e the ad8099 a n ideal ad c dr i v er . e v en t h o u g h t h e ad8099 is n o t u n i t y ga in st a b le, i t ca n b e co nf igur e d to pr o d uce a net ga i n o f +1 a m plif ier , as sh o w n i n f i gur e 71 . this is achi e v e d b y com b in in g a ga in o f +2 an d a ga in o f C1 fo r a net ga i n o f +1. the i n p u t ra n g e o f th e ad c is 0 v t o 2.5 v . t a b l e 6 sh o w s t h e p e r f o r ma n c e da ta o f t h e ad8099 a nd t h e ana l og d e vices ad7667 a 1 m s ps 16-b i t ad c. table 6. adc driver per f or mance, f c = 20 khz, v out = 2.24 v p-p p a r a m e t e r m e a s u r e m e n t ( d b ) s e c o nd har m onic distor tion C111.4 thir d har m onic distor tion C103.2 t h d C 1 0 1 . 4 s f d r 1 0 2 . 2 s n r 8 8 . 1
ad8099 rev. b | page 23 of 28 circuit considerations optimizing the performance of the ad8099 requires attention to detail in layout and signal routing of the board. power supply bypassing, parasitic capacitance, and component selection all contribute to the overall performance of the amplifier. the ad8099 features an exposed paddle on the backs of both the csp and soic packages. the exposed paddle provides a low thermal resistive path to the ground plane. for best performance, solder the exposed paddle to the ground plane. pcb layout the compensation network is determined by the amplifier gain requirements. for lower gains, the layout and component placement are more critical. for higher gains, there are fewer compensation components, which results in a less complex layout. with diligent consideration to layout, grounding, and component placement, the ad8099 evaluation boards have been optimized for peak performance. these are the same evaluation boards that are available to customers; see table 7 for ordering information. the noninverting evaluation board art- work for soic and csp layouts are shown in figure 72 and figure 73. incorporating the layout information shown in figure 72 and figure 73 into new designs is highly recom- mended and helps to ensure optimal circuit performance. the concepts of layout, grounding, and component placement, llustrated in figure 72 and figure 73,also apply to inverting configurations. for scale, the boards are 2 2. parasitics the area surrounding the compensation pin is very sensitive to parasitic capacitance. to realize the full gain bandwidth product of the ad8099, there should be no trace connected to or within close proximity of the external compensation pin for the lowest possible capacitance. when compensation is required, the traces to the compensation pin, the negative supply, and the interconnect between components (i.e. c c , c1, and r c in figure 59) should be made as wide as possible to minimize inductance. all ground and power planes under the pins of the ad8099 should be cleared of copper to prevent parasitic capacitance between the input and output pins to ground. a single mount- ing pad on a soic footprint can add as much as 0.2 pf of capacitance to ground as a result of not clearing the ground or power plane under the ad8099 pins. parasitic capacitance can cause peaking and instability, and should be minimized to ensure proper operation. the new pinout of the ad8099 reduces the distance between the output and the inverting input of the amplifier. this helps to minimize the parasitic inductance and capacitance of the feedback path, which, in turn, reduces ringing and second harmonic distortion. grounding when possible, ground and power planes should be used. ground and power planes reduce the resistance and inductance of the power supply feeds and ground returns. if multiple planes are used, they should be stitched together with multiple vias. the returns for the input, output terminations, bypass capacitors, and r g should all be kept as close to the ad8099 as possible. ground vias should be placed at the very end of the component mounting pad to provide a solid ground return. the output load ground and the bypass capacitor grounds should be returned to a common point on the ground plane to minimize parasitic inductance and improve distortion performance. the ad8099 packages feature an exposed paddle. for optimum performance, solder this paddle to ground. for more information on pcb layout and design considerations, refer to section 7-2 of the 2002 analog devices op amp applications book. power supply bypassing the ad8099 power supply bypassing has been optimized for each gain configuration as shown in figure 60 through figure 66 in the circuit configurations section. the values shown should be used when possible. bypassing is critical for stability, frequency response, distortion, and psrr performance. the 0.1 f capacitors shown in figure 60 through figure 66 should be as close to the supply pins of the ad8099 as possible and the electrolytic capacitors beside them. component selection smaller components less than 1206 smt case size, offer smaller mounting pads, which have less parasitics and allow for a more compact layout. it is critical for optimum performance that high quality, tight tolerance (where critical), and low drift compo- nents be used. for example, tight tolerance and low drift is critical in the selection of the feedback capacitor used in figure 60. the feedback compensation capacitor in figure 60 is 1.5pf. this capacitor should be specified with npo material. npo material typically has a 30 ppm/ c change over C55c to +125 c temperature range. for a 100c change, this would result in a 4.5 ff change in capacitance, compared to an x7r material, which would result in a 0.23 pf change, a 15% change from the nominal value. this could introduce excessive peaking, as shown in figure 68, c f vs. frequency response. design tools and technical support analog devices is committed to the design process by providing technical support and online design tools. adi offers technical support via free evaluation boards, sample ics, spice models, interactive evaluation tools, application notes, phone and email supportall available at www.analog.com .
ad8099 rev. b | page 24 of 28 04511- a- 001 f i gur e 7 2 . soic e v al ua ti on bo ar d a r t w o r k 04511- a- 001 f i g u re 73. csp ev al uat i on bo ar d a r t w ork eval uation boar ds ther e a r e f o ur dif f er en t eval ua tio n bo a r ds a v a i l a b l e , as sh o w n in t a b l e 7, and an a p p l ic a t ion n o t e , an-720, tha t explain s t h e us e o f t h e ev al ua t i o n boa r d s . table 7. e v aluation board sele ction guide p a ck age t y pe board configuration c s p s o i c i n v e r t i n g e v al - a d o p a mp -1csp - i e v al - a d o p a mp - 1 r - i n nonin v er t i n g e v al - a d o p a mp -1csp - n e v al - a d o p a mp - 1 r - n i
ad8099 rev. b | page 25 of 28 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. 0 0 ( 0 . 197 ) 4.90 (0.193) 4. 8 0 ( 0 . 189 ) 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 . 0 92) bottom view (pins up) 2 . 29 ( 0 . 092 ) 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 74. 8-l e ad s t anda r d s m a l l o u t l ine p a ckag e [soic- e d ] (r d - 8-1) 1 bo t t o m view 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. 6 5 t y p seating plane pin 1 indicator 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 75. 8-l e ad p l as t i c su r f ace - m o u n t p a ck ag e [csp ] (c p - 8) di me nsio ns sho w n i n mi ll im e t e r s
ad8099 rev. b | page 26 of 28 ordering guide model minimum ordering quantity temperature rang e package description branding package option ad8099ard 1 C40c to +125c 8-lead soic-ed rd-8-1 ad8099ard-reel 2,500 C40c to +125c 8-lead soic-ed rd-8-1 ad8099ard-reel7 1,000 C40c to +125c 8-lead soic-ed rd-8-1 ad8099ardz 1 1 C40c to +125c 8-lead soic-ed rd-8-1 ad8099ardz-reel 1 2,500 C40c to +125c 8-lead soic-ed rd-8-1 ad8099ardz-reel7 1 1,000 C40c to +125c 8-lead soic-ed rd-8-1 AD8099ACP-R2 250 C40c to +125c 8-lead csp hdb cp-8 ad8099acp-reel 5,000 C40c to +125c 8-lead csp hdb cp-8 ad8099acp-reel7 1,500 C40c to +125c 8-lead csp hdb cp-8 ad8099acpz-r2 1 250 C40c to +125c 8-lead csp hdb cp-8 ad8099acpz-reel 1 5,000 C40c to +125c 8-lead csp hdb cp-8 ad8099acpz-reel7 1 1,500 C40c to +125c 8-lead csp hdb cp-8 1 z = pb free
ad8099 rev. b | page 27 of 28 notes
ad8099 rev. b | page 28 of 28 notes ? 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 . d04511C0C 6/04(b)

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