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high speed, rail-to-rail output, op amp with ultralow power-down ada4850-1/ada4850-2 rev. a in fo rmation furn is h e d by an al o g dev i ces is believed to be a ccu rate and r e liable. how e ver, no r e spons i bili ty is assumed by analog devices fo r its use, nor f o r an y i n fri n geme nt s of p a t e nt s or ot her ri g h t s o f th ird parties th at may result fro m its use . specifications subject 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 he rwi s e un der a n y p a t e nt or p a t e nt r i ghts of anal og de vices. trad emarks 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. 461. 31 13 ? 2005 a n alog de vices, i n c. al l r i ght s r e ser v ed . features ultralow power-down current: 150 n a /amp max low quiescent current: 2.4 m a /amp high speed 175 mh z ? 3 db bandwidth 220 v/s s l ew r a te 85 ns sett ling ti me to 0.1% excellent vi deo specifications 0.1 db fl atness: 14 mh z differentia l gai n : 0.12% differentia l ph ase: 0.0 9 single-supply operation: 2.7 v to 6 v rail-to-rail out p ut output swings to within 80 m v of either r a il low voltage offset: 0.6 mv applic ati o ns portable multi m edia pla y ers video cameras digital sti ll ca meras consumer vi de o pin c o nfig uratio ns 1 power down 2 nc 3 ?i n 4 +in 7 output 8 +v s 6 nc 5 ?v s ada4850-1 05320-106 nc = no connect f i g u re 1. 8-l e ad , 3 mm 3 m m lfc s p nc = no connect 1 v out 1 2 ?in1 3 +in1 4 ?v s 11 v out 2 12 +v s 10 ?in2 9 +in2 5 n c 6 n c 7 n c 8 n c 1 5 n c 1 6 n c 1 4 p d 1 1 3 p d 2 ada4850-2 05320-043 f i g u re 2. 16-l e ad , 3 m m 3 m m l f csp p general description the ad a4850-1, ad a4850-2 1 a r e lo w p r ice , hig h s p ee d , v o l t a g e f eed back ra il-t o-ra il o u tput op am p s w i t h u l t r a l o w p o w e r - do wn. d e s p i t e t h eir lo w p r ice , t h e ad a4850-1/ ad a4850 -2 p r o v ide exce l l en t o v eral l p e r f o r ma n c e and v e rs a t ili t y . th e 175 mh z ?3 db ba ndwid th and 220 v/s s l ew r a t e mak e t h es e a m p l if iers w e l l -s u i t e d f o r ma n y g e n e ral- p u r p o s e , h i g h s p e e d ap p l i c at i o n s . the ad a4850-1/ad a4850-2 ar e desig n e d t o op era t e a t su p p l y v o l t a g es as lo w as 2.7 v a nd u p t o 6 v a t 2.4 ma o f s u p p l y c u r r en t p e r a m plif ier . i n p o w e r - do w n m o de, t h e s u p p l y c u r r en t is les s tha n 150 na, ideal f o r ba t t e r y -p o w er ed a p p l ica t io n s . the ad a4850 f a mil y p r o v ides us ers wi th a tr ue sin g le-s u p p l y ca p a b i li ty , al lo win g in p u t sig n al s t o ext e nd 200 mv be l o w t h e n e ga ti v e ra il a n d t o wi thin 2. 2 v o f th e posi ti v e ra il . th e o u t p u t o f th e a m p l i f i e r ca n sw in g w i t h in 80 m v o f ei t h e r s u p p l y ra il . w i t h i t s com b ina t io n o f lo w p r i c e , exce l l en t dif f er en t i al ga i n (0.12%), dif f er en t i al p h as e (0.0 9o), a nd 0.1 db f l a t n e s s ou t t o 14 mh z, t h e s e am plif iers a r e id e a l fo r vide o a p pl ica t io n s . the ad a4850-1/ad a4850-2 ar e desig n e d t o w o rk in t h e ext e nded t e m p era t ur e ra n g e o f ?40c t o +125c. clos e d -loop gain (db) 1 100 10 1000 05320-054 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 g = +1 v s = 5v r l = 1k ? v out = 0.1v p-p fi g u r e 3 . s m a l l s i g n a l fr e q u e n c y r e s p o n s e 1 p a te nt pe nd ing.
ada4850-1/ada4850-2 rev. a | page 2 of 16 table of contents specifications with +3 v supply ..................................................... 3 specifications with +5 v supply ..................................................... 4 absolute maximum ratings ............................................................ 5 thermal resistance ...................................................................... 5 esd caution .................................................................................. 5 typical performance characteristics ............................................. 6 circuit description ......................................................................... 12 headroom and overdrive recovery considerations ............ 12 operating the ada4850-1/ada4850-2 on bipolar supplies .......................................................................... 13 power-down pins ....................................................................... 13 outline dimensions ....................................................................... 14 ordering guide .......................................................................... 14 revision history 4/05rev. 0 to rev. a addedada4850-1..............................................................universal added 8-lead lfcsp.........................................................universal changes to features.......................................................................... 1 changes to general description .................................................... 1 changes to figure 3.......................................................................... 1 changes to table 1............................................................................ 3 changes to table 2............................................................................ 4 changes to power-down pins section and table 5 ................... 13 updated outline dimensions ....................................................... 14 changes to ordering guide .......................................................... 14 2/05revision 0: initial version
ada4850-1/ada4850-2 rev. a | page 3 of 16 specifications with +3 v supply t a = 25c, r f = 0 ? for g = +1, r f = 1 k? for g > +1, r l = 1 k?, unless otherwise noted. table 1. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p-p 160 mhz g = +2, v o = 0.5 v p-p, r l = 150 ? 45 mhz bandwidth for 0.1 db flatness g = +2, v o = 0.5 v p-p, r l = 150 ? 14 mhz slew rate g = +2, v o = 1 v step 110 v/s settling time to 0.1% g = +2, v o = 1 v step, r l = 150 ? 80 ns noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 1 mhz, v o = 2 v p-p, g = +3, r l = 150 ? ?72/?77 dbc input voltage noise f = 100 khz 10 nv/hz input current noise f = 100 khz 2.5 pa/hz differential gain g = +3, ntsc, r l = 150 ?, v o = 2 v p-p 0.2 % differential phase g = +3, ntsc, r l = 150 ?, v o = 2 v p-p 0.2 degrees dc performance input offset voltage 0.6 4.1 mv input offset voltage drift 4 v/ c input bias current 2.4 4.4 a input bias current drift 4 na/ c input bias offset current 30 na open-loop gain v o = 0.25 v to 0.75 v 78 100 db input characteristics input resistance differential/ common-mode 0.5/5.0 m? input capacitance 1.2 pf input common-mode voltage range ?0.2 to +0.8 v input overdrive recovery time (rise/fall) v in = +3.5 v to ?0.5 v, g = +1 60/50 ns common-mode rejection ratio v cm = 0.5 v ?76 ?108 db power-down power-down input voltage power-dow n ada4850-1/ada4850-2 <0.7/<0.6 v enabled ada4850-1/ada4850-2 >0.8/>1.7 v turn-off time 0.7 s turn-on time 60 ns power-down bias current/ power down pin enabled power-down = 3 v 37 55 a power-down power-down = 0 v 0.01 0.2 a output characteristics output overdrive recovery time (rise/fall) v in = +0.7 v to ?0.1 v, g = +5 70/100 ns output voltage swing 0.06 to 2.83 0.03 to 2.92 v short-circuit current sinking/sourcing 105/74 ma power supply operating range 1 2.7 6 v quiescent current/amplifier 2.4 2.8 ma quiescent current (power-down)/amplifier 15 150 na positive power supply rejection +v s = +3 v to +4 v, ?v s = 0 v ?83 ?100 db negative power supply rejection +v s = +3 v, ?v s = 0 v to C1 v ?83 ?102 db 1 for operation on bipolar supplies, see the section. operating the ada4850-1/ada 4850-2 on bipolar supplies
ada4850-1/ada4850-2 rev. a | page 4 of 16 specifications with +5 v supply t a = 25c, r f = 0 ? for g = +1, r f = 1 k? for g > +1, r l = 1 k?, unless otherwise noted. table 2. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p-p 175 mhz g = +1, v o = 0.5 v p-p 110 mhz bandwidth for 0.1 db flatness g = +2, v o = 1.4 v p-p, r l = 150 ? 9 mhz slew rate g = +2, v o = 4 v step 220 v/s g = +2, v o = 2 v step 160 v/s settling time to 0.1% g = +2, v o = 1 v step, r l = 150 ? 85 ns noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 1 mhz, v o = 2 v p-p, g = +2, r l = 150 ? ?81/?86 dbc input voltage noise f = 100 khz 10 nv/hz input current noise f = 100 khz 2.5 pa/hz differential gain g = +3, ntsc, r l = 150 ? 0.12 % differential phase g = +3, ntsc, r l = 150 ? 0.09 degrees crosstalk(rti)-ada4850-2 f = 4.5 mhz, r l = 150 ?, v o = 2 v p-p 60 db dc performance input offset voltage 0.6 4.2 mv input offset voltage drift 4 v/ c input bias current 2.3 4.2 a input bias current drift 4 na/ c input bias offset current 30 na open-loop gain v o = 2.25 v to 2.75 v 83 105 db input characteristics input resistance differential/ common-mode 0.5/5.0 m? input capacitance 1.2 pf input common-mode voltage range ?0.2 to +2.8 v input overdrive recovery time (rise/fall) v in = +5.5 v to ?0.5 v, g = +1 50/40 ns common-mode rejection ratio v cm = 2.0 v ?85 ?110 db power-down power-down input voltage power-dow n ada4850-1/ada4850-2 <0.7/<0.6 v enabled ada4850-1/ada4850-2 >0.8/>1.7 v turn-off time 0.7 s turn-on time 50 ns power-down bias current/ power down pin enabled power-down = 5 v 0.05 0.13 ma power-down power-down = 0 v 0.02 0.2 a output characteristics output overdrive recovery time (rise/fall) v in = +1.1 v to ?0.1 v, g = +5 60/70 ns output voltage swing 0.14 to 4.83 0.07 to 4.92 v short-circuit current sinking/sourcing 118/94 ma power supply operating range 1 2.7 6 v quiescent current/amplifier 2.5 2.9 ma quiescent current (power-down)/amplifier 15 150 na positive power supply rejection +v s = +5 v to +6 v, ?v s = 0 v ?84 ?100 db negative power supply rejection +v s = +5 v, ?v s = ?0 v to ?1 v ?84 ?102 db 1 for operation on bipolar supplies, see the section. operating the ada4850-1/ada 4850-2 on bipolar supplies
ada4850-1/ada4850-2 r e v. a | pa ge 5 o f 1 6 absolute maximum ratings table 3. p a r a m e t e r r a t i n g supply voltage 12.6 v power dissi pati on see figure 4 power down pi n voltage ( ? v s + 6) v common-mode input vol t age (? v s ? 0.5 ) v to (+v s + 0.5) v differential input voltage +v s to ?v s storage temperature ?65c to +125c operating tem p erature range ?40c 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 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 . thermal resistance ja is sp e c if ie d fo r t h e w o rst - ca s e co ndi t i o n s, t h a t is, ja is s p eci f i e d f o r th e d e v i ce so l d e r ed i n t h e ci r c ui t b o a r d f o r s u rfa c e - mou n t p a ck age s . table 4. therm a l resistance package type ja unit 16-lead lfcsp 91 c/w 8-lead lfcsp 80 c/w maximum power dissipation the maxim u m s a f e p o w e r dis s i p a t io n f o r th e ad a4850-1 / ad a4850 -2 is limi t e d b y the as s o cia t e d r i s e in j u n c tion t e m p era t ur e (t j ) on t h e di e. a t a ppro x i m a t ely 1 5 0 c, w h ich is th e gla ss tra n si tio n t e m p e r a t ur e , th e pla s ti c c h a n g e s 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 ad a4850 -1/ad a 4850-2. e x c eedin g a j u n c tion t e m p era t ur e of 150c f o r a n ext e nded p e r i o d o f time can r e s u l t in c h a n g e s in sili co n de vi ces, po t e n t iall y ca usi n g degrad a t i o n o r los s o f fu n c ti o n al i t y . 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 d i e d u e t o t h e ad a4850-1/ad a48 50-2 dr i v e a t t h e o u t p u t . the q u ies 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 ppl y p i n s (v s ) t i m e s t h e q u ies c en t c u r r en t (i s ). p d = qu i e s c e n t p o w e r + ( to t a l d r i v e p o w e r ? lo a d p o w e r ) () l out l out s s s d r v r v v i v p 2 C 2 ? ? ? ? ? ? ? ? + = 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 to ? v s , as in sing le-su p ply o p er a t io n, t h e to t a l dr i v e p o w e r is 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 w o rs t cas e , w h en v ou t = v s /4 fo r r l to mi d s upply . () ( ) l s s s d r 4 v i v p 2 / + = 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 , t h e w o rs t cas e is v ou t = v s /2. air f lo w in cr e a s e s h e a t di ssi p a t i o n, ef fe c t i vely r e d u cing 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 a n d exp o s e d p a ddle f r o m m e t a l t r ac es, t h r o ug h h o les, g r o u n d , a nd po w e r p l a n e s r e d u c e ja . 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 vs. t h e a m b i e n t t e m p era t ur e fo r t h e lfcs p (91c/ w) p a ck age on a j e de c st a n d a rd 4 - l a y e r b o ard. ja val u es a r e a p p r o x im a t io n s . ?5 5 125 ? 4 5 ? 3 5 ? 2 5 ? 1 5 ? 5 5 1 52 5 3 5 4 5 5 56 57 58 59 5 1 0 5 1 1 5 maxi mum po w e r di ssi pat i o n (w ) ambient temperature ( c) 05320-055 0 2.5 2.0 1.5 1.0 0.5 lfcsp-8 lfcsp-16 f i g u re 4. 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 caution esd (electrostatic discharge) sensitive device. electr ostatic charges as high as 4000 v rea d ily accumulate on the human body and test eq uipment and can discharge without detection. although this product features proprietary esd protection circ uitry, permanent dama ge may occur on dev i ces subj ected to high energy electrostatic di scharge s . t h erefore, proper esd precautions are recom m ended to avoid performan c e degradation or l o ss of functiona l ity.
ada4850-1/ada4850-2 r e v. a | pa ge 6 o f 1 6 typical perf orm ance cha r acte ristics t a = 25c, r f = 0 ? f o r g = +1, r f = 1 k? f o r g > +1, r l = 1 k ? , u n l e ss ot he r w i s e note d. normalize d clos e d -loop gain (db) 05320-044 frequency (mhz) ?6 ?5 ?4 ?3 ?2 ?1 0 1 1 1 0 100 v s = 5v r l = 150 ? v out = 0.1v p-p g = +10 g = ? 1 g = +2 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 clos e d -loop gain (db) 1 100 10 1000 05320-045 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 v s = 5v g = +1 v out = 0.1v p-p r l = 150 ? r l = 1k ? f i g u re 6. 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 l o ads clos e d -loop gain (db) 05320-046 frequency (mhz) ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 1 100 10 1000 v s = 5v v s = 3v g = +1 r l = 150 ? v out = 0.1v 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 s u p p li es closed- l oop gain ( d b) 1 100 10 300 05320-007 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 4 3 g = +1 v s = 5v r l = 1k ? v out = 0.1v p-p 6pf 1pf 0pf 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 ca pac i to r l o ads 6.2 5.4 100k 100m 05320-047 frequency (hz) gain ( d b) 6.1 6.0 5.9 5.8 5.7 5.6 5.5 1m 10m v s = 5v g = +2 r l = 150 ? v s = 5v, v out = 0.1v p-p v s = 5v, v out = 2v p-p v s = 5v, v out = 1.4v p-p v s = 3v, v out = 0.5v p-p f i gur e 9 . 0 . 1 db f l a t ness resp o n se clos e d -loop gain (db) 1 100 10 1000 05320-048 frequency (mhz) ?7 ?5 ?6 ?3 ?4 ?1 ?2 1 0 v s = 5v g = +1 v out = 0.5v p-p r l = 150 ? r l = 1k ? f i gur e 1 0 . la r g e f r equenc y respo n se fo r v a r i o u s l o a d s
ada4850-1/ada4850-2 r e v. a | pa ge 7 o f 1 6 3 ?5 1 1000 05320-057 frequency (mhz) c l osed - l oop ga in ( d b ) 2 1 0 ?1 ?2 ?3 ?4 10 100 v s = 3v g = +1 r l = 1k ? v out = 0.1v p-p +125 c ?4 0 c +25 c +85 c 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 t e mper at ur es 3 ?5 1 1000 05320-098 frequency (mhz) closed- l oop gain ( d b) 2 1 0 ?1 ?2 ?3 ?4 10 100 v s = 5v g = +1 r l = 1k ? v out = 0.1v p-p +125 c ?4 0 c +25 c +85 c 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 t e mper at ur es ?2 0 0 20 40 60 80 100 120 open- l oop gain ( d b) open - l oop ph a se ( d egrees) 1 00k 10 k 100 1k 10 1 m 10m 1 00m 1g frequency (hz) 05320-012 phase gain v s = 5v 140 ? 240 ? 210 ? 180 ? 150 ? 120 ?9 0 ?6 0 ?3 0 0 f i gure 13. o p en-l oop g a in and phase vs . f r equenc y 0 100 200 150 50 300 250 slew r a t e ( v / s) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 output voltage step (v) 05320-024 g = +2 v s = 5v r l = 1k ? 5.0 positive slew rate negative slew rate f i gure 1 4 . slew ra te vs . o u tput v o l t a g e supply current ( a) power-down voltage (v) 05320-036 0.1 10k 0 5.0 1 10 100 1k 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 v s = 3v, 5v, ada4850-2 v s = 3v, 5v, ada4850-1 power down v s = 3v, 5v, ada4850-1 enable f i gure 15. sup p l y current v s . p o w e r - d o wn v o lt age cros s t alk (db) frequency (hz) 1m 100k 10m 100m 05320-037 v out 1 to v out 2 ?100 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 v out 2 to v out 1 g = +2 v s = 5v r l = 150 ? v out = 2v p-p fi g u r e 1 6 . c r o s s t a l k v s . fr e q u e n c y
ada4850-1/ada4850-2 r e v. a | pa ge 8 o f 1 6 ? 40 ?110 0.1 100 05320-102 frequency (mhz) harmonic dis t ortion (dbc ) ?5 0 ?6 0 ?7 0 ?8 0 ?9 0 ?100 11 0 r l = 150 ? hd2 r l = 1k ? hd3 r l = 1k ? hd2 r l = 150 ? hd3 g = +1 v s = 5v v out = 500mv p-p f i gur e 1 7 . ha rm onic di stor ti on vs . f r eque nc y fo r v a r i o u s l o a d s ? 50 ?120 0.1 100 05320-103 frequency (mhz) harmonic dis t ortion (dbc ) ?6 0 ?7 0 ?8 0 ?9 0 ?100 ?110 11 0 g = +2 v s = 5v r l = 1k ? v out = 200mv p-p hd2 v out = 500mv p-p hd2 v out = 200mv p-p hd3 v out = 500mv p-p hd3 f i gur e 1 8 . ha rm onic di stor ti on vs . f r eque nc y fo r v a r i o u s v ou t 0.35 0.40 0.45 0.50 0.55 0.60 0.65 output voltage (v) time (ns) 50 0 100 150 200 05320-019 g = +2 r l = 1k ? v s = 5v f i g u re 19. 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 l i es output voltage (v) 0 2 0 4 0 6 0 8 0 100 120 140 160 180 200 time (ns) 05320-020 2.425 2.450 2.475 2.525 2.550 2.575 2.500 g = +1 v s = 5v r l = 150 ? 10pf 0pf f i g u re 20. 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 oad 1.75 2.00 2.25 2.50 2.75 3.00 3.25 ou tpu t volta ge for 5v su pply ( v ) time (ns) 50 0 100 150 200 05320-050 g = +2 r l = 1k ? v s = 5v f i g u re 21. lar g e s i g n al t r ans i ent r e s p ons e 2.125 2.250 2.375 2.500 2.625 2.750 2.875 ou tpu t volta ge for 5v su pply ( v ) time (ns) 50 0 100 150 200 05320-049 g = +1 r l = 1k ? v s = 5v v s = 3v 0.125 0.250 0.375 0.625 0.750 0.875 ou tpu t volta ge for 3v su pply ( v ) 0.500 f i g u re 22. lar g e s i g n al t r ans i ent r e s p ons e f o r v a r i ous s u p p l i es
ada4850-1/ada4850-2 r e v. a | pa ge 9 o f 1 6 ?1 0 1 2 3 4 5 6 voltage (v) 03 0 15 45 05320-025 time ( s) g = +2 v s = 5v f in = 400khz v out v disable f i g u re 23. e n ab le/ d is abl e ti me 5.5 ? 0.5 0 1000 05320-058 time (ns) inp u t and outp ut v o ltage (v ) 100 200 300 400 500 600 700 800 900 input output g = +1 v s = 5v r l = 150 ? f = 1mhz 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 f i gure 24. input o v er dr ive r eco ver y ? 0.5 0 1000 05320-060 time (ns) inp u t and outp ut v o ltage (v ) 2.5 100 200 300 400 500 600 700 800 900 5 input output 3.0 2.0 1.5 1.0 0.5 0 3.5 g = +5 v s = 3v r l = 150 ? f = 1mhz f i gure 25. o u tput o v er dr ive r e c o ver y 1 voltage noise ( n v/ hz) 100k 10 k 100 1k 10 1m 10m 100 m frequency (hz) 05320-059 1000 10 100 f i gure 26. v o ltage nois e v s . f r eq uenc y 1 curre nt nois e (pa/ hz) 10 0k 10k 100 1k 1 0 1m 1 0 m 100m 1g frequency (hz) 05320-095 100 10 f i gure 27. cur r ent nois e v s . f r eq uenc y 350 0 ?4 4 05320-065 v offset (mv) count 300 250 200 150 100 50 ? 3 ? 2 ? 1 0123 v s = 5v n = 1720 x = 450 v = 750 v f i gure 28. input o f f s et v o ltag e d i strib u tion
ada4850-1/ada4850-2 rev. a | page 10 of 16 400 200 ? 1.0 3.5 05320-063 v cm (v) v os ( v) 380 360 340 320 300 280 260 240 220 ? 0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 v s = 5v f i g u re 29. input o f f s et v o lt ag e v s . co m m o n -m ode v o lt ag e 0.6 0 05 0 05320-064 load current (ma) outp ut s a turation v o ltage (v ) 0.5 0.4 0.3 0.2 0.1 5 1 01 52 02 53 0 3 54 04 5 v s = 3v ?v sat +v sat v s = 5v f i g u re 30. o u t p ut s a t u r a t i on v o lt ag e v s . l oad cur r ent ( v olt a g e d i f f e r e nt i a l f r o m r a ils ) ?30 ?46 ?44 ?42 ?40 ?38 ?36 ?34 ?32 ?40 125 05320-091 temperature ( c) p o we r-down p i n bias curre nt ( a) ? 2 5 ? 1 0 5 2 03 55 0 6 58 09 5 1 1 0 v s = 3v v s = 5v f i gure 31. p o wer - d o wn bi as cur r ent v s . t e mper ature fo r v a ri ous su p p l i es ?1.2 ?2.4 ?2.2 ?2.0 ?1.8 ?1.6 ?1.4 ?40 125 05320-092 temperature ( c) inp u t bias curre nt ( a) ? 2 5 ? 1 0 5 2 03 55 0 6 58 09 5 1 1 0 v s = 3v +i b ?i b v s = 5v f i gure 32. input b i a s current v s . t e mpe r ature fo r v a r i ous s u p p l i es 95 65 ? 4 0 125 05320-062 temperature ( c) outp ut s a turation v o ltage (mv ) 90 85 80 75 70 ?25 ? 10 5 2 0 3 5 5 0 6 5 8 0 9 5 110 +v s ? v out ?v s ? v out v s = 5v r l = 1k ? f i g u re 33. 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 ( v olt a g e d i f f e r e nt i a l f r o m r a ils ) 4.9 4.2 4.3 4.4 4.5 4.6 4.7 4.8 ?40 125 05320-090 temperature ( c) s u p p l y curre nt (ma) ? 2 5 ? 1 0 5 2 03 55 0 6 58 09 5 1 1 0 v s = 5v v s = 3v f i gur e 3 4 . c u rr e n t vs . t e m p er a t ur e fo r v a ri o u s s u ppl i e s
ada4850-1/ada4850-2 rev. a | page 11 of 16 05320-094 frequency (hz) p o we r s u p p l y re j e ction (db) ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 ? 100 0 ? 110 100 1m 100 k 1k 10k 1 0 m 1 0 0 m v s = 5v +psr ? psr f i gure 35. p o wer s u p p ly rej e c t ion ( p s r ) vs. f r equenc y 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 ?0.1 ?40 125 05320-093 temperature ( c) in pu t offset volta ge ( m v) ? 2 5 ? 1 0 5 2 03 55 0 6 58 09 5 1 1 0 v s = 5v v s = 3v f i gure 36. input o f f s et v o ltag e v s . t e m p er atu r e for v a r i ou s sup p l i es ?2 0 ?120 1k 05320-034 frequency (hz) common-mode re j e ction (db) ?30 ?40 ?50 ?60 ?70 ?80 ?90 ? 100 ?110 10k 100k 1m 10m 100m v s = 5v channel 1 channel 2 f i gur e 3 7 . c o mm on-mo d e reje ct i o n r a tio ( c mrr) vs . f r e q ue nc y
ada4850-1/ada4850-2 rev. a | page 12 of 16 circuit description the ad a4850-1/ad a4850-2 fea t ur e a hig h s l e w ra t e in p u t s t a g e th a t i s a tr ue si n g le -s u p p l y t o po log y , ca pa b l e o f se n s i n g sign als a t o r b e lo w t h e n e ga ti v e s u p p l y ra il . th e ra il-t o-ra il ou t p ut st age c a n s w ing to w i t h i n 8 0 mv of e i t h e r su p p ly r a i l when dr ivin g l i g h t lo ads an d wi thin 0.17 v w h en dr ivin g 150 ?. h i g h sp eed p e r f o r ma n c e is main ta in e d a t s u p p ly v o l t a g es as lo w as 2.7 v . headroom and over drive recovery consi d era t io ns inp u t the ad a4850-1/ad a4850-2 ar e desig n e d f o r us e in lo w v o l t a g e sys t ems. t o ob t a i n o p t i m u m p e r f o r ma n c e, i t is us ef u l to un d e rst a nd t h e b e ha vio r o f t h e a m plif ier as i n pu t a nd o u t p ut sig n a l s a p p r o a ch t h e am plif ier s h e a d r o o m l i m i ts. t h e in pu t co mm on-m o d e v o l t a g e ra n g e ext e n d s 200 mv b e lo w t h e ne g a t i ve supply vo lt age or g r ou n d f o r s i ng l e - s upply op e r a t i o n t o w i t h i n 2 . 2 v of t h e p o s i t i ve supply vol t age. t h e r e f ore, i n a g a i n o f +3, th e ad a4850-1/ad a48 50-2 ca n p r o v ide f u l l ra il-t o-ra il ou t p ut s w ing for su p p ly vol t age as l o w as 3 . 3 v , assu mi ng t h e in p u t sig n a l s w i n g is f r o m ?v s ( o r g r o u n d ) t o 1. 1 v . e x ce e d in g t h e he adr o o m l i m i t i s n o t a con c er n fo r a n y in v e r t ing ga in o n an y supply vol t a g e, as lo n g as t h e r e fer e n c e vol t a g e a t t h e am plif ier s p o si t i v e i n p u t l i e s w i t h i n t h e am plif ier s in p u t co mm on-m o d e ra n g e . the i n p u t s t a g e s e ts t h e he adr o o m limi t fo r sig n als w h en t h e a m plif ier is us e d i n a ga i n o f +1 fo r sig n a l s a p p r o a chin g t h e p o si ti v e ra il . f o r hig h sp e e d s i g n als, h o we v e r , t h er e a r e o t h e r c o ns i d e r a t i o ns . f i g u re 3 8 s h o w s ? 3 d b b a nd w i dt h v s . d c i n put v o l t a g e fo r a uni t y-ga i n fol l o w er . a s t h e comm on- m o d e v o l t a g e a p p r o a ch es t h e p o si t i v e s u p p l y , t h e b a n d wi d t h b e g i n s t o dr o p wh e n wi th in 2 v o f +v s . this c a n ma n i fest i t s e lf in i n cr e a s e d d i stor t i on or s e tt l i ng t i me. 2 ?6 0.1 1000 05320-096 frequency (mhz) gain ( d b) 1 0 ?1 ?2 ?3 ?4 ?5 1 1 0 100 v s = 5v g = +1 r l = 1k ? v out = 0.1v p-p v cm = 3v v cm = 3.1v v cm = 3.2v v cm = 3.3v f i gure 38. unit y- g a in f o llow er bandwidth vs. f r equ e nc y fo r v a ri ous input com m o n - mode h i g h e r f r e q u e n c y s i g n a l s re qu i r e more he a d ro om t h an t h e lo w e r f r e q uen c ies t o ma in ta in d i st o r tio n p e rf o r ma n c e . f i gur e 39 i l l u s t ra t e s h o w t h e r i sin g e d g e s e t t lin g t i m e f o r th e am p l if ier co nf igur e d as a uni t y - ga i n fol l o w er st r e t c h e s o u t as t h e t o p o f a 1 v s t e p in p u t a p p r oa c h e s a n d ex ceed s th e s p ecif i e d i n p u t co mm on- m o d e vol t a g e li mi t. 3.6 1.8 0 100 05320-061 time (ns) output voltage (v) 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 10 20 30 40 50 60 70 80 90 v s = 5v g = +1 r l = 1k ? v step = 2v to 3v v step = 2.4v to 3.4v v step = 2.3v to 3.3v v step = 2.2v to 3.2v v step = 2.1v to 3.1v f i gur e 3 9 . p u l s e r e sp o n se , input h e a d r o om l i mi ts the r e co v e r y tim e f r o m in p u t v o l t a g es 2.2 v or c l os er t o th e p o si t i v e sup p ly is a p p r o x im a t e l y 50 n s , w h ich is limi t e d b y t h e se t t l i n g a r ti fa ct s c a u s e d b y tra n si s t o r s i n t h e in p u t s t a g e c o m i n g out of s a tu r a t i o n . th e ad a4850-1 / ad a4850-2 do n o t exhi b i t p h ase r e v e r s a l , ev en f o r i n put vo lt ag es b e y o nd t h e vo lt ag e s u ppl y r a i l s . g o i n g more t h an 0 . 6 v b e y o nd t h e p o we r sup p l i es tu r n s on p r ote c t i on d i o d e s a t t h e in p u t st a g e , w h ic h g r e a tly in cr e a se t h e c u r r en t dra w o f t h e de vices. out p ut f o r sig n als a p p r o a c h in g t h e nega ti v e su p p l y a n d in v e r t in g ga in, a nd hig h p o si t i ve ga in co nf igura t io n s , t h e h e a d ro o m lim i t is t h e o u t p u t s t a g e . the ad a4850-1/ad a4850 -2 a m p l if iers us e a c o m m o n - e m i tt e r output s t a g e . t h i s ou tput s t a g e m a x i m i z e s t h e a v a i la b l e o u t p u t ra n g e , limi t e d b y t h e s a t u ra t i on v o l t a g e o f t h e o u t p u t tra n sis t ors. the s a t u ra t i o n v o l t a g e in cr e a s e s wi t h dr i v e c u r r en t, d u e t o t h e o u t p ut t r a n si s t o r col l e c t o r r e sis t a n c e . a s th e sa t u ra ti o n po i n t o f th e o u t p u t s t a g e i s a p p r oa c h ed , th e o u t p u t si g n al s h o w s in cr e a sin g a m o u n t s o f co m p r e s s io n a n d cli p p i n g . a s in t h e in p u t h e adr o o m cas e , hig h er f r e q uen c y sig n als r e q u i r e a b i t m o r e h e adr o o m tha n t h e lo w e r f r e q uen c y si g n als. o u t p u t o v erlo ad r e co v e r y is typ i cal l y wi thin 4 0 n s a f t e r the a m plif ier s i n p u t is b r o u g h t t o a n o n o v e rlo a d i ng va l u e . f i gur e 40 sh o w s th e o u t p u t r e co v e r y tra n si e n t s f o r th e a m p l i f i e r re c o ve r i ng f r om a s a tu r a te d output f r om t h e to p an d b o tto m s u p p lies t o a p o in t a t mids u p p l y .
ada4850-1/ada4850-2 rev. a | page 13 of 16 6.5 ? 1.5 0 100 05320-042 time (ns) inp u t and outp ut v o ltage (v ) 5.5 4.5 3.5 2.5 1.5 0.5 ? 0.5 10 20 30 40 50 60 70 80 90 v s = 5v g = ? 1 r l = 1k ? input voltage edges v out = +2.5v to 0v v out = ? 2.5v to 0v f i g u re 40. o v er l o a d r e c o ver y operating the ada4850-1/ada4850-2 on bipolar su pplies the ad a4850-1/ad a4850-2 c a n o p era t e o n b i p o la r s u p p lies u p t o 5 v . th e o n l y r e s t r i c t io n is tha t t h e v o l t ag e betw een ?v s a nd t h e p o w e r - do wn pin m u st n o t exce e d 6 v . v o l t a g e dif f er en ces g r ea t e r tha n 6 v ca n ca us e p e r m an en t da ma g e t o t h e a m plif ier . f o r exa m ple , w h e n op era t i n g o n 5 v s u p p lies, t h e p o w e r - do wn pi n m u st n o t exce e d +1 v . power-down pins the ad a4850-1/ad a4850-2 fea t ur e a n u l tral o w p o wer - do wn m o de tha t lo w e rs th e s u p p l y c u r r en t t o les s than 150 na. w h en a p o w e r - do w n p i n is b r o u g h t to wi t h i n 0.6 v of t h e nega t i ve su p p ly , t h e am plif ier is p o w e r e d do wn. t a b l e 5 o u t l i n es t h e p o we r - d o w n pi n f u nc t i on a l it y . t o e n su re prop e r op e r a t i o n , t h e p o we r - d o w n pi ns ( p d ) s h ou l d not b e l e f t f l o a t i ng . table 5. power - down pins fu nctionality 3 v an d 5 v supply vo ltage ada4 850- 1 ada4 850- 2 powered down 0 v to 0.7 v 0 v to 0.6 v enabled 0.8 to +v s 1.7 v to +v s
ada4850-1/ada4850-2 rev. a | page 14 of 16 outline dimensions 1 exp o sed pa d ( b o t t o m vi ew ) 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 1.89 1.74 1.59 4 1.60 1.45 1.30 3.00 bsc sq 5 8 f i g u re 41. 8-l e ad l e ad f r a m e ch ip s c al e p a ck age [lfcs p _vd] 3 mm 3 m m b o d y , v e r y thin, d u al l e ad (cp - 8- 2) di me nsio ns sho w n i n mi ll im e t e r s 1 0.50 bsc 0.60 max p i n 1 i n d i c a t o r 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 typ 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 3.00 bsc sq * 1.65 1.50 sq 1.35 16 5 13 8 9 12 4 exposed pa d ( b o t to m vi ew ) * compliant to jedec standards mo-220-veed-2 except for exposed pad dimension. f i gure 42. 1 6 -l ead l e ad f r a m e ch ip s c a l e p a ck ag e [lfcs p _vq] 3 mm 3 m m b o d y , v e r y thin q u ad (c p - 1 6 - 3 ) di me nsio ns sho w n i n mi ll im e t e r s ordering guide model temperature r a nge package descri ption package outlin e branding ada4850-1ycp z-r2 1 ?40c to +125c 8-lead lead frame chip scale p a ckage (lfcsp_vd) cp-8-2 hwb ada4850-1ycp z-rl 1 ?40c to +125c 8-lead lead frame chip scale p a ckage (lfcsp_vd) cp-8-2 hwb ada4850-1ycp z-rl7 1 ?40c to +125c 8-lead lead frame chip scale p a ckage (lfcsp_vd) cp-8-2 hwb ada4850-2ycp z-r2 1 ?40c to +125c 16-lead lead fr ame chip scale package (lfcsp_vq) cp-16-3 htb ada4850-2ycp z-rl 1 ?40c to +125c 16-lead lead fr ame chip scale package (lfcsp_vq) cp-16-3 htb ada4850-2ycp z-rl7 1 ?40c to +125c 16-lead lead fr ame chip scale package (lfcsp_vq) cp-16-3 htb 1 z = pb-free part.
ada4850-1/ada4850-2 rev. a | page 15 of 16 notes
ada4850-1/ada4850-2 rev. a | page 16 of 16 notes ?2005 a n alo g de vices, inc. all rig h ts reserv ed. tra d ema r ks and registered tra d ema r ks are the prop erty of their respective owners . d05320C0 ? 4/05(a)

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