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rail-to-rail, high output current amplifier AD8397 rev. 0 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 ? 2005 analog de vices, i n c. al l r i ght s r e ser v ed . fea t ures dual operational amplifier voltage fee d back wide s u pply ra nge: fro m 3 v t o 24 v rail-to-rail out p ut output swing t o within 0.5 v o f supply r a ils high linear out p ut current 310 ma pe ak into 32 ? on 12 v suppl ies whil e maintaining ?80 db c sfdr low noise 4.5 nv/h z voltage noise dens ity @ 100 kh z 1.5 pa/h z cur r ent noise dens ity @ 100 kh z high speed 69 mhz bandw i dth (g = 1, ?3 db ) 53 v/s slew ra te (r load = 2 5 ? ) applic a t io ns twisted-pair li ne drivers audio applicati o ns general-purpo s e high current amplifiers gener a l description the AD8397 has tw o v o l t a g e f eed back o p er a t ional a m p l if iers ca p a b l e o f dr ivi n g h e a v y lo ads wi t h exce l l en t li n e a r i t y . th e co mm o n - e mi t t er , ra i l -t o-ra i l ou t p ut s t a g e s u r p as s e s t h e o u t p u t v o l t a g e c a p a b i li t y o f typ i cal emi t t e r - fol l o w er o u t p u t s t a g es and ca n s w in g t o wi thin 0.5 v o f ei t h er ra il w h ile dr i v in g a 25 ? l o a d . t h e l o w d i stor t i on , h i g h output c u r r e n t , an d w i d e output d y na mic ran g e ma k e t h e a d 83 97 ide a l fo r a p pl ica t ion s t h a t r e q u ir e a la rge s i g n a l s w in g in t o a h e a v y lo ad . f a b r i c a t ed wi th a d i s hi gh s p ee d ex tra f a s t c o m p l e m e n t a r y b i p o la r h i gh v o l t a g e (xfcb-hv) p r o c es s, t h e high b a n d wid t h a nd fast sle w r a te o f t h e ad839 7 k e ep disto r t i on to a m i ni m u m while als o dis s i p a t in g minim u m p o w e r . the AD8397 is a v ailab l e in a st anda r d 8 - le ad soi c p a ck a g e and , fo r hig h er p o w e r a p pli - ca t i on s, a t h er mal l y enha n c e d 8 - le ad so i c ep a d p a cka g e . b o t h p a cka g es c a n op era t e f r o m ?40 c t o +85c. pin c o nfig ur a t ion out1 1 ? in1 2 +in1 3 ?v s 4 +v s out2 ?in2 +in2 8 7 6 5 05069-001 f i g u re 1. 8-l e ad so ic 1.50 ?1.50 ?1.25 ?1.00 ?0.75 ?0.50 ?0.25 0 0.25 0.50 0.75 1.00 1.25 0 2 4 6 8 10 12 14 16 18 20 05069-031 time ( s) v out (v ) f i gure 2. o u tput swing , v s = 1. 5 v , r l = 2 5 ? 12 ?12 ?9 ?6 ?3 0 3 6 9 0 2 4 6 8 10 12 14 16 18 20 05069-032 time ( s) v out (v ) f i gure 3. o u tput swing , v s = 1 2 v , r l = 10 0 ?
AD8397 rev. 0 | page 2 of 16 table of contents specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 7 maximum power dissipation ..................................................... 7 esd caution .................................................................................. 7 typical performance characteristics ............................................. 8 general description ....................................................................... 11 power supply and decoupling ................................................. 11 layout considerations ............................................................... 11 unity-gain output swing ......................................................... 11 capacitive load drive ............................................................... 12 outline dimensions ....................................................................... 13 ordering guide .......................................................................... 13 revision history 1/05revision 0: initial version
AD8397 rev. 0 | page 3 of 16 specifications v s = 1.5 v or +3 v (@ t a = 25c, g = +1, r l = 25 ?, unless otherwise noted). table 1. parameter test conditions/comments min typ max unit dynamic performance ?3 db bandwidth v out = 0.1 v p-p 50 mhz 0.1 db flatness v out = 0.1 v p-p 3.6 mhz large signal bandwidth v out = 2.0 v p-p 9 mhz slew rate v out = 0.8 v p-p 32 v/s noise/distortion performance distortion (worst harmonic) f c = 100 khz, v out = 1.4 v p-p, g = +2 ?90 dbc input voltage noise f = 100 khz 4.5 nv/hz input current noise f = 100 khz 1.5 pa/hz dc performance input offset voltage 1.0 2.5 mv t min ? t max 2.5 mv input offset voltage match 1.0 2.0 mv input bias current 200 900 na t min ? t max 1.3 a input offset current 50 300 na open-loop gain v out = 0.5 v 81 88 db input characteristics input resistance f = 100 khz 87 k? input capacitance 1.4 pf common-mode rejection ?v cm = 1 v ?71 ?80 db output characteristics output resistance 0.2 ? +swing r load = 25 ? +1.39 +1.43 v p ?swing r load = 25 ? ?1.4 ?1.37 v p +swing r load = 100 ? +1.45 +1.48 v p ?swing r load = 100 ? ?1.47 ?1.44 v p maximum output current sfdr ?70 dbc, f = 100 khz, v out = 0.7 v p , r load = 4.1 ? 170 ma power supply operating range (dual supply) 1.5 12.0 v supply current 6 7 8.5 ma/amp power supply rejection ?v s = 0.5 v ?70 ?82 db
AD8397 rev. 0 | page 4 of 16 v s = 2.5v or +5 v (@ t a = 25c, g = +1, r l = 25 ?, unless otherwise noted). table 2. parameter test conditions/comments min typ max unit dynamic performance ?3 db bandwidth v out = 0.1 v p-p 60 mhz 0.1 db flatness v out = 0.1 v p-p 4.8 mhz large signal bandwidth v out = 2.0 v p-p 14 mhz slew rate v out = 2.0 v p-p 53 v/s noise/distortion performance distortion (worst harmonic) f c = 100 khz, v out = 2 v p-p, g = +2 ?98 dbc input voltage noise f = 100 khz 4.5 nv/hz input current noise f = 100 khz 1.5 pa/hz dc performance input offset voltage 1.0 2.4 mv t min ? t max 2.5 mv input offset voltage match 1.0 2.0 mv input bias current 200 900 na t min ? t max 1.3 a input offset current 50 300 na open-loop gain v out = 1.0 v 85 90 db input characteristics input resistance f = 100 khz 87 k? input capacitance 1.4 pf common-mode rejection ?v cm = 1 v ?76 ?80 db output characteristics output resistance 0.2 ? +swing r load = 25 ? +2.37 +2.42 v p ?swing r load = 25 ? ?2.37 ?2.32 v p +swing r load = 100 ? +2.45 +2.48 v p ?swing r load = 100 ? ?2.46 ?2.42 v p maximum output current sfdr ?70 dbc, f = 100 khz, v out = 1.0 v p , r load = 4.3 ? 230 ma power supply operating range (dual supply) 1.5 12.6 v supply current 7 9 12 ma/amp power supply rejection ?v s = 0.5 v ?75 ?85 db
AD8397 rev. 0 | page 5 of 16 v s = 5 v or +10 v (@ t a = 25c, g = +1, r l = 25 ?, unless otherwise noted). table 3. parameter test conditions/comments min typ max unit dynamic performance ?3 db bandwidth v out = 0.1 v p-p 66 mhz 0.1 db flatness v out = 0.1 v p-p 6.5 mhz large signal bandwidth v out = 2.0 v p-p 14 mhz slew rate v out = 4.0 v p-p 53 v/s noise/distortion performance distortion (worst harmonic) f c = 100 khz, v out = 6 v p-p, g = +2 ?94 dbc input voltage noise f = 100 khz 4.5 nv/hz input current noise f = 100 khz 1.5 pa/hz dc performance input offset voltage 1.0 2.5 mv t min ? t max 2.5 mv input offset voltage match 1.0 2.0 mv input bias current 200 900 na t min ? t max 1.3 a input offset current 50 300 na open-loop gain v out = 2.0 v 85 94 db input characteristics input resistance f = 100 khz 87 k? input capacitance 1.4 pf common-mode rejection ?v cm = 1 v ?84 ?94 db output characteristics output resistance 0.2 ? +swing r load = 25 ? +4.7 +4.82 v p ?swing r load = 25 ? ?4.74 ?4.65 v p +swing r load = 100 ? +4.92 +4.96 v p ?swing r load = 100 ? ?4.92 ?4.88 v p maximum output current sfdr ?80 dbc, f = 100 khz, v out = 3 v p , r load = 12 ? 250 ma power supply operating range (dual supply) 1.5 12.6 v supply current 7 9 12 ma/amp power supply rejection ?v s = 0.5 v ?76 ?85 db
AD8397 rev. 0 | page 6 of 16 v s = 12 v or +24 v (@ t a = 25c, g = +1, r l = 25 ?, unless otherwise noted). table 4. parameter test conditions/comments min typ max unit dynamic performance ?3 db bandwidth v out = 0.1 v p-p 69 mhz 0.1 db flatness v out = 0.1 v p-p 7.6 mhz large signal bandwidth v out = 2.0 v p-p 14 mhz slew rate v out = 4.0 v p-p 53 v/s noise/distortion performance distortion (worst harmonic) f c = 100 khz, v out = 20 v p-p, g = +5 ?84 dbc input voltage noise f = 100 khz 4.5 nv/hz input current noise f = 100 khz 1.5 pa/hz dc performance input offset voltage 1.0 3.0 mv t min ? t max 2.5 mv input offset voltage match 1.0 2.0 mv input bias current 200 900 na t min ? t max 1.3 a input offset current 50 300 na open-loop gain v out = 3.0 v 90 96 db input characteristics input resistance f = 100 khz 87 k? input capacitance 1.4 pf common-mode rejection ?v cm = 1 v ?85 ?96 db output characteristics output resistance 0.2 ? +swing r load = 100 ? +11.82 +11.89 v p ?swing r load = 100 ? ?11.83 ?11.77 v p maximum output current sfdr ?80 dbc, f = 100 khz, v out = 10 v p , r load = 32 ? 310 ma power supply operating range (dual supply) 1.5 12.6 v supply current 8.5 11 15 ma/amp power supply rejection ?v s = 0.5 v ?76 ?86 db
AD8397 rev. 0 | page 7 of 1 6 absolute maximum ra tings table 5. p a r a m e t e r r a t i n g supply voltage 26.4 v power dissi pati on 1 see figure 4 storage temperature ?65c to +125c operating temperature range ?40c to +85c 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 onl y ; f u n c t i o n al o p era t ion o f t h e de vice a t t h es e o r an y o t h e r con d i t io ns a b o v e t h o s e i ndic a te d i n t h e op er a t io na l s e c - t 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 . 1 th erm a l r e si st a n ce fo r st a n da rd j e d e c 4- la yer b o a r d: 8-lead soic: ja = 1 57.6c/w 8- lea d soi c ep ad : ja = 47.2c/w ma ximum po wer dissip a tion the max i m u m p o w e r t h a t can b e dissi p a t e d s a fely b y th e AD8397 is limi t e d b y the ass o cia t e d r i s e in j u n c tion t e m p era t ur e . the maxim u m s a fe j u n c t i on t e m p era t ur e fo r p l as tic enca ps u l a t e d de vices is det e r m in ed b y t h e g l as s tra n si tion t e m p era t ur e o f the p l as tic, a p p r o x ima t e l y 150c. t e m p o r a r il y ex ceed in g th i s li mi t ma y ca use a sh i f t in p a ra m e t r ic p e r f o r ma n c e d u e t o a cha n g e in t h e s t r e s s es exer t e d o n t h e die b y t h e p a ckag e . 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 ? 4 0 ? 3 0 ? 2 0 ? 1 0 0 1 02 0 3 04 05 0 6 07 08 09 0 05069-020 ambient temperature ( c) m a xim u m pow e r d i ssipa tion ( w ) t j = 150 c 8-lead soic 8-lead soic epad f i gure 4. m a xi m u m p o wer d i s s i pat i on v s . t e mpe r atu r e esd c a ution esd (electrostatic discharge) sensitive device. ele c tr ostatic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharg e wit h out detection. althou gh this product features proprietary esd protection circu i try, permanent damage may occur on devices s u bjec ted to high energy elec- trostatic dischar g es. t h erefore, proper esd prec aution s are reco mmended to avoid performanc e degradation or los s of functionality.
AD8397 rev. 0 | page 8 of 1 6 typical perf orm ance cha r acte ristics 100 80 60 ? 100 ?80 ?60 ?40 ?20 0 20 40 0 2 0 4 0 6 0 8 0 100 120 140 160 180 200 05069-029 time (ns) output ( m v) v out v in f i g u re 5. s m a l l sig n al p u ls e r e s p ons e (g = + 1 , v s = 5 v , r l = 2 5 ?) 5 ?1 0 1 2 3 4 0 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 05069-022 time ( s) output ( v ) v in v out f i gure 6. la r g e s i g n al p u lse r e sponse (0 v to 4 v , v s = 5 v , r l = 2 5 ?) 05069-004 3.0 ? 1.0 ? 0.5 0 0.5 1.0 1.5 2.0 2.5 6 ?2 ?1 0 1 2 3 4 5 0 4 0 8 0 120 160 200 240 280 320 360 400 time (ns) input ( v ) output (v) v in v out f i gure 7. o u tput o v er dr ive r eco ver y (v s = 5 v , g a in = +2, r l = 25 ?) 0 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0.01 0.1 1 1 0 100 05069-005 frequency (mhz) cmrr (db) out 1 out 2 fi g u r e 8 . c o m m o n - m o d e r e j e c t i o n v s . fr e q u e n c y (v s = 5 v , r l = 2 5 ?) 0 ? 110 ? 100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0.01 0.1 1 1 0 100 05069-006 frequency (mhz) cros s t alk (db) out 1 out 2 f i g u r e 9 . ou t p u t - t o - ou t p u t cr o ssta l k vs . f r equenc y (v s = 5 v , v o = 1 v p - p , r l = 2 5 ?) 0.3 ? 0.3 ? 0.2 ? 0.1 0 0.1 0.2 0.1 1 1 0 05069-007 frequency (mhz) gain ( d b) v o = 100mv p-p f i g u re 10. 0. 1 db f l at nes s (v s = 5 v , v o = 0. 1 v p - p , g a in = +1 , r l = 25 ?)
AD8397 rev. 0 | page 9 of 1 6 10 ?40 ?30 ?20 ?10 0 0.01 100 10 1 0.1 05069-008 frequency (mhz) normalize d gain (db) g = +10 g = +2 g = +1 f i gur e 1 1 . smal l 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 (v s = 5 v , v o = 0. 1 v p - p , r l = 2 5 ?) 10 ?40 ?30 ?10 0 ?20 0.01 100 10 1 0.1 05069-009 frequency (mhz) gain ( d b) 12v 5v 2.5v f i g u re 12. 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 s u p p l i es (g ain = +1, v o = 0. 1 v p - p , r l = 2 5 ?) 100 ?40 ?20 0 20 40 60 80 135 ?180 ?135 ?90 ?45 0 45 90 0.001 0.01 0.1 1 1 0 100 1000 05069-010 frequency (mhz) open- l oop gain ( d b) ph a se ( d egrees) phase gain f i g u re 13. o p en l o op g a in and phas e v s . f r equenc y (v s = 5 v , r l = 2 5 ?) 10 ?40 ?30 ?20 ?10 0 0.01 0.1 1 1 0 100 05069-011 frequency (mhz) normalize d gain (db) g = +10 g = +2 g = +1 f i gur e 1 4 . 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 (v s = 5 v , v o = 2 v p - p , r l = 2 5 ?) 20 ?40 ?30 ?20 ?10 0 10 0.01 0.1 1 1 0 100 05069-012 frequency (mhz) gain ( d b) 12v 5v 2.5v f i g u re 15. 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 l i es (g ain = +1, v o = 2 v p - p , r l = 2 5 ?) ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 0.01 0.1 1 frequency (mhz) 10 100 05069-013 p s rr (db) + psr r ? psrr f i gure 16. p o wer s u p p ly rej e c t ion (v s = 5 v , r l = 25 ? )
AD8397 rev. 0 | page 10 of 16 0 ? 120 ? 110 ? 100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0.01 10 1 0.1 05069-023 frequency (mhz) distortion ( d bc) second harmonic third harmonic f i gur e 1 7 . di stor ti on vs . f r e q ue nc y (v s = 5 v , v o = 2 v p - p , g = + 2 , r l = 2 5 ?) ?40 ? 120 ? 110 ? 100 ?90 ?80 ?70 ?60 ?50 0 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 05069-024 output voltage (v p-p) distortion ( d bc) second harmonic third harmonic f i g u re 18. d i s t o r t i o n v s . o u t p ut v o lt ag e @ 10 0 k h z, (v s = 1 . 5 v , g = +2, r l = 25 ?) ?40 ? 120 ? 110 ? 100 ?90 ?80 ?70 ?60 ?50 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 05069-025 output voltage (v p-p) distortion ( d bc) second harmonic third harmonic f i g u re 19. d i s t o r t i o n v s . o u t p ut v o lt ag e @ 10 0 k h z, (v s = 2 . 5 v , g = +2, r l = 25 ?) ?40 ? 120 ? 110 ? 100 ?90 ?80 ?70 ?60 ?50 012 345 678 9 1 0 05069-026 output voltage (v p-p) distortion ( d bc) second harmonic third harmonic f i g u re 20. d i s t o r t i o n v s . o u t p ut v o lt ag e @ 10 0 k h z, (v s = 5 v , g = + 2 , r l = 2 5 ?) ?40 ? 120 ? 110 ? 100 ?90 ?80 ?70 ?60 ?50 0 2 4 6 8 10 12 14 16 18 20 22 24 05069-027 output voltage (v p-p) distortion ( d bc) second harmonic third harmonic f i g u re 21. d i s t o r t i o n v s . o u t p ut v o lt ag e @ 10 0 k h z, (v s = 1 2 v , g = +5 , r l = 5 0 ?)
AD8397 rev. 0 | page 11 of 16 gene ral description the AD8397 is a v o l t a g e f eedbac k o p era t io nal am p l if ier which fe a t ur es a n h- b r idg e in p u t s t a g e a nd co mm on- e mi t t er , ra i l -t o- ra il o u t p u t s t a g e. th e AD8397 c a n o p er a t e f r o m a wide s u p p l y ra n g e , 1.5 v t o 12 v . w h en d r i v in g ligh t lo ad s, th e ra il-t o-ra il o u t p ut is c a p a b l e o f swi n g i n g t o wi t h in 0.2 v o f ei t h er ra i l . th e o u t p u t can als o de li v e r hig h lin e a r o u t p u t c u r r en t w h en dr iving h e a v y lo ads, u p t o 310 ma in t o 32 ? while ma in ta inin g ?80 db c s f d r . th e ad8 397 is fa b r ica t e d o n analog de vices p r o p r i eta r y ex t r a f a s t c o m p lem e n t a r y bi p o la r h i g h v o l t ag e p r o c es s (xfcb-hv). power sup p l y an d de c o upling the AD8397 can b e p o w e r e d wi th a go o d q u al i t y , w e l l - r e gu la te d , lo w no is e s u p p l y f r o m 1.5 v t o 12 v . c a r e f u l a tte n t i o n s h ou l d b e p a i d to de c o upl i ng t h e p o we r supply . h i g h q u a l i t y c a p a ci t o rs wi t h lo w e q uiva len t s e r i es r e sist an ce (es r ), s u c h as m u l t il a y er cera mic c a p a ci t o rs (ml c cs), s h o u ld be us e d to mini mi ze t h e su p p ly vol t a g e r i p p le a nd p o w e r dissi p a t ion. a 0.1 f ml cc deco u p lin g ca p a c i t o r(s) s h o u l d b e lo ca t e d n o m o r e than 1/8 in ch a w a y f r o m t h e p o w e r s u p p ly p i n(s). a la rg e ta n t a l um 10 f t o 47 f ca p a ci to r is r e co mm ended t o p r o v ide go o d de co u p ling fo r lo w e r f r e q uen c y sig n a l s a nd to su p p ly c u r r en t f o r fas t , la rg e sig n al c h an g e s a t t h e ad8 397 o u t p u t s. l a y o ut c o nsider a t i o ns a s wi t h al l hig h s p e e d a p p l ic a t io n s , ca r e f u l a t t e n t io n sh o u ld be p a id to p r in te d cir c ui t b o a r d (p cb) la yo u t i n o r der to p r e v en t as s o c i a t e d bo a r d p a rasi tics f r om b e co min g p r ob lema tic. th e pcb sh o u ld ha ve a lo w im p e dan c e r e t u r n p a t h (o r g r o u n d ) t o t h e su p p l y . re mo vin g t h e g r o u nd plan e f r o m al l la yers in t h e im m e d i a t e a r e a o f t h e am plif ier h e l p s t o r e d u ce st ra y ca p a c i t a n- ces. the sig n a l r o u t in g sh o u ld b e sh o r t and dir e c t in o r der to mini mi ze t h e p a rasi t i c i n d u c t an ce an d ca p a c i t a n c e ass o ci a t e d wi t h t h es e trace s . t e r m ina t io n resis t o r s a nd lo ads s h o u l d b e lo ca ted as c l os e as p o s s ib le t o their r e s p ec ti v e in p u ts and o u t p uts. i n pu t t r aces sh o u ld b e k e pt as fa r a p a r t as p o ssib le f r o m th e o u t p u t traces t o minimize co u p lin g (cr o s s t al k) th o u g h th e boa r d . w h en t h e ad8 397 is co nf igur ed as a dif f er en t i al dr i v er , as in s o me lin e dr ivin g a p p l ica t io n s , a symm etr i c a l l a yo u t sh o u ld be prov i d e d to t h e e x te n t p o ss ibl e i n orde r to ma x i mi z e b a l a nc e d p e r f or m a nc e. whe n r u n n i ng d i f f e r e n t i a l s i g n a l s ove r a l o ng dis t an c e , t h e t r aces o n t h e pcb s h o u ld b e clos e t o g e t h er o r a n y dif f er en t i al wir i n g s h o u l d b e t w is te d t o g e t h er t o minimize t h e a r e a o f t h e i n d u c t i v e lo o p t h a t is fo r m e d . this r e d u ces t h e r a di a t e d e n erg y a nd ma k e s t h e c i r c ui t less sus c e p t i b l e to rf in t e r f er en c e . a d h e r e n c e t o s t r i pline desig n t e chniq u es fo r lo n g sig n a l t r aces (g r e a t er t h a n a p p r o x im a t e l y 1 in ch) is r e co mme n d e d . unity - gain output s w ing w h en o p era t ing th e AD8397 in a uni t y-gain c o nf igura t io n, t h e o u t p ut do es n o t s w in g to t h e r a i l s a nd is co nst r a i n e d b y t h e h - b r idge in p u t. this can b e s e en b y com p ar in g t h e o u t p ut o v er dr i v e r e co v e r y in f i gur e 7 a nd t h e i n p u t ov er dr i v e r e co v e r y in f i gur e 22. t o a v o i d o v er dr i v i n g t h e in p u t and to r e a l i z e t h e f u l l swing a f fo r d e d b y t h e ra i l - t o-ra i l o u t p u t st age , t h e am plif ier shou l d b e u s e d i n a g a i n of t w o or g r e a te r . 05069-028 input output 7 ?1 0 1 0 8 0 160 240 320 400 time (ns) 480 560 640 720 800 2 3 4 5 6 volts f i g u re 22. u n it y- g a in input o v er d r ive r e c o ver y
AD8397 rev. 0 | page 12 of 16 ca p a c i t i v e l o a d d r i v e w h en dr i v i n g c a p a ci t i ve lo ads, ma n y hi g h sp e e d o p er a t io na l a m plif iers exhib i t p e a k in g i n t h eir f r e q uen c y r e sp o n s e . i n a ga in-o f-tw o cir c ui t, f i gur e 23 sho w s tha t the AD8397 ca n dr i v e ca p a c i ti v e lo ads u p t o 270 pf wi th o n l y 3 db o f p e aking. f o r a m p l if iers wi t h m o r e limi te d ca p a ci ti v e lo ad dr i v e , a smal l s e r i es re s i stor ( r s ) i s g e n e rall y used bet w een t h e a m p l if i e r o u t p u t a n d t h e ca p a c i t i ve lo ad i n o r der t o mini mi ze p e a k i n g an d e n sur e de vice s t ab ili t y . f i gur e 24 s h o w s tha t t h e us e o f a 2.2 ? s e r i es r e sis t o r ca n f u r t h e r ext e n d t h e c a p a ci t i v e lo ad dr i v e o f t h e AD8397 o u t t o 470 pf , while k e ep in g t h e f r eq u e n c y r e s p o n s e peaki n g t o wi thi n 3 db . 5 0 ?5 ?10 ?15 ?20 ?25 ?30 ?35 ?40 0.01 0.1 1 1 0 100 05069-030 frequency (mhz) gain ( d b) 470pf 390pf 330pf 270pf 5 0 ?5 ?10 ?15 ?20 ?25 ?30 ?35 ?40 0.01 0.1 1 1 0 100 05069-021 frequency (mhz) gain ( d b) 220pf 100pf 270pf 150pf f i g u re 24. cap a c i t i ve l oad p e ak i n g w i t h 2. 2 ? s e ri es r e s i s t or f i g u re 23. cap a c i t i ve l oad p e ak i n g wit h out s e r i es r e s i s t or
AD8397 rev. 0 | page 13 of 16 outline dimensions 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5 . 00 ( 0 . 196 8) 4 . 80 ( 0 . 189 0) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design compliant to jedec standards ms-012aa f i g u re 25. 8-l e ad s t anda r d s m a l l o u t l ine p a ckag e [soic ] narro w b o dy (r -8) di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s) compliant to jedec standards ms-012-aa controlling dimensions are in millimeter; inches dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. 0.25 (0.0098) 0.17 (0.0068) 1.27 (0.050) 0.40 (0.016) 0.50 (0.020) 0.25 (0.010) 45 8 0 1.75 (0.069) 1.35 (0.053) seating plane 85 4 1 5.00 (0.197) 4.90 (0.193) 4.80 (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 3. 098 ( 0 . 1 22) bottom view (pins up) 2. 41 ( 0 . 0 95) 0.25 (0.0098) 0.10 (0.0039) f i g u re 26. 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_ n_e p ] nar r o w b o dy (rd - 8-2) di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s) ordering guide model temperature p a ckage package descri ption package outlin e AD8397arz 1 ?40c to +85c 8-lead soic r-8 AD8397arz-re e l 1 ?40c to +85c 8-lead soic r-8 AD8397arz-re el7 1 ?40c to +85c 8-lead soic r-8 AD8397ardz 1 ?40c to +85c 8-lead soic-ep a d rd-8-2 AD8397ardz-reel 1 ?40c to +85c 8-lead soic-ep a d rd-8-2 AD8397ardz-r eel7 1 ?40c to +85c 8-lead soic-ep a d rd-8-2 1 z = pb-free part.
AD8397 rev. 0 | page 14 of 16
AD8397 rev. 0 | page 15 of 16 notes
AD8397 rev. 0 | page 16 of 16 notes ? 2005 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 . d05069C0C 1/05(0)

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