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max4249?ax4257 ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrated? website at www.maximintegrated.com. general description the max4249?ax4257 low-noise, low-distortion oper- a t i o n a l a m p l i f i e r s o f f e r r a i l - t o - r a i l o u t p u t s a n d s i n g l e - s u p p l y o p e r a t i o n d o w n t o 2 . 4 v . t h e y d r a w 4 0 0 a o f q u i e s c e n t s u p p l y c u r r e n t p e r a m p l i f i e r w h i l e f e a t u r i n g ultra-low distortion (0.0002% thd), as well as low input v o l t a g e - n o i s e d e n s i t y ( 7 . 9 n v / ! h z ) a n d l o w i n p u t current-noise density (0.5fa/ ! h z ) . t h e s e f e a t u r e s m a k e t h e d e v i c e s a n i d e a l c h o i c e f o r p o r t a b l e / b a t t e r y - p o w e r e d a p p l i c a t i o n s t h a t r e q u i r e l o w d i s t o r t i o n a n d / o r l o w n o i s e . f o r a d d i t i o n a l p o w e r c o n s e r v a t i o n , t h e m a x 4 2 4 9 / m a x 4 2 5 1 / m a x 4 2 5 3 / m a x 4 2 5 6 o f f e r a l o w - p o w e r s h u t - down mode that reduces supply current to 0.5? and p u t s t h e a m p l i f i e r s o u t p u t s i n t o a h i g h - i m p e d a n c e s t a t e . t h e m a x 4 2 4 9 - m a x 4 2 5 7 s o u t p u t s s w i n g r a i l - t o - r a i l a n d t h e i r i n p u t c o m m o n - m o d e v o l t a g e r a n g e i n c l u d e s g r o u n d . t h e m a x 4 2 5 0 m a x 4 2 5 4 a r e u n i t y - g a i n s t a b l e w i t h a g a i n - b a n d w i d t h p r o d u c t o f 3 m h z . t h e m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 a r e i n t e r - nally compensated for gains of 10v/v or greater with a g a i n - b a n d w i d t h p r o d u c t o f 2 2 m h z . t h e s i n g l e m a x 4 2 5 0 / m a x 4 2 5 5 a r e a v a i l a b l e i n s p a c e - s a v i n g 5 - p i n s o t 2 3 p a c k a g e s . t h e m a x 4 2 5 2 i s a v a i l a b l e i n a n 8 - b u m p c h i p - s c a l e p a c k a g e ( u c s p ) a n d t h e m a x 4 2 5 3 i s a v a i l a b l e i n a 1 0 - b u m p u c s p . t h e m a x 4 2 5 0 a a u k c o m e s i n a 5 - p i n s o t 2 3 p a c k a g e a n d i s s p e c i f i e d f o r o p e r a t i o n o v e r t h e a u t o m o t i v e ( - 4 0 c t o + 1 2 5 c ) t e m p e r a t u r e r a n g e . applications wireless communications devices pa control portable/battery-powered equipment medical instrumentation adc buffers digital scales/strain gauges featur es ! available in space-saving ucsp, sot23, and ! max packages ! low distortion: 0.0002% thd (1k " load) ! 400 ! a quiescent supply current per amplifier ! single-supply operation from 2.4v to 5.5v ! input common-mode voltage range includes ground ! outputs swing within 8mv of rails with a 10k " load ! 3mhz gbw product, unity-gain stable (max4250?ax4254) 22mhz gbw product, stable with a v # 10v/v (max4249/max4255/max4256/max4257) ! excellent dc characteristics v os = 70 ! v i bias = 1pa large-signal voltage gain = 116db ! low-power shutdown mode reduces supply current to 0.5 ! a places outputs in a high-impedance state ! 400pf capacitive-load handling capability 19-1295; rev 9; 12/12 o r d e r i n g i n f o r m a t i o n c o n t i n u e d a t e n d o f d a t a s h e e t . s e l e c t o r g u i d e a p p e a r s a t e n d o f d a t a s h e e t . for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrated? website at www.maximintegrated.com. u c s p i s a t r a d e m a r k a n d m a x i s a r e g i s t e r e d t r a d e m a r k o f m a x i m i n t e g r a t e d p r o d u c t s , i n c . a b c 1 2 3 outa v dd outb ina- inb- inb+ v ss ina+ max4252 outa v dd outb ina- inb- ina+ inb+ v ss shdna shdnb max4253 c1 b1 a1 a2 a3 a4 b4 c2 c3 c4 top view (bumps on bottom) ucsp ucsp p i n / b u m p c o n f i g u r a t i o n s c o n t i n u e d a t e n d o f d a t a s h e e t . pin/bump configurations or dering infor mation part temp range pin- p a c k a g e t o p m a r k max4249 e s d + - 4 0 c t o + 8 5 c 1 4 s o m a x 4 2 4 9 e u b + - 4 0 c t o + 8 5 c 1 0 m a x max4250 e u k + t - 4 0 c t o + 8 5 c 5 s o t 2 3 a c c i m a x 4 2 5 0 a a u k + t - 4 0 c t o + 1 2 5 c 5 s o t 2 3 a e y j + d e n o t e s a l e a d ( p b ) - f r e e / r o h s - c o m p l i a n t p a c k a g e . t = t a p e a n d r e e l .
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps 2 maxim integrated max4249?ax4257 absolute maximum ratings electrical characteristics (v dd = 5v, v ss = 0v, v cm = 0v, v out = v dd /2, r l connected to v dd /2, shdn = v dd , t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (notes 2, 3) s t r e s s e s b e y o n d t h o s e l i s t e d u n d e r a b s o l u t e m a x i m u m r a t i n g s m a y c a u s e p e r m a n e n t d a m a g e t o t h e d e v i c e . t h e s e a r e s t r e s s r a t i n g s o n l y , a n d f u n c t i o n a l o p e r a t i o n o f t h e d e v i c e a t t h e s e o r a n y o t h e r c o n d i t i o n s b e y o n d t h o s e i n d i c a t e d i n t h e o p e r a t i o n a l s e c t i o n s o f t h e s p e c i f i c a t i o n s i s n o t i m p l i e d . e x p o s u r e t o a b s o l u t e m a x i m u m r a t i n g c o n d i t i o n s f o r e x t e n d e d p e r i o d s m a y a f f e c t d e v i c e r e l i a b i l i t y . power-supply voltage (v dd to v ss ) ......................+6.0v to -0.3v analog input voltage (in_+, in_-) ....(v dd + 0.3v) to (v ss - 0.3v) shdn input voltage ......................................6.0v to (v ss - 0.3v) output short-circuit duration to either supply ..........continuous continuous power dissipation (t a = +70?) 5-pin sot23 (derate 7.1mw/? above +70?) ...........571mw 8-bump ucsp (derate 4.7mw/? above +70?)........379mw 8-pin ?ax (derate 4.5mw/? above +70?) ............362mw 8-pin so (derate 5.88mw/? above +70?) ...............471mw 10-bump ucsp (derate 6.1mw/? above +70?) ......484mw 10-pin ?ax (derate 5.6mw/? above +70?) ...........444mw 14-pin so (derate 8.33mw/? above +70?) ..............667mw operating temperature range ...........................-40? to +85? max4250aauk .............................................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units s u p p l y v o l t a g e r a n g e v dd (note 4) 2.4 5.5 v v dd = 3 v 4 0 0 e t e m p e r a t u r e 4 2 0 5 7 5 v dd = 5 v m a x 4 2 5 0 a a u k 6 7 5 n o r m a l m o d e v dd = 5 v , u c s p o n l y 4 2 0 6 5 5 q u ie s c e n t s u p p ly c u rre n t p e r a m p lifie r i q s h u t d o w n m o d e ( s h d n = v ss ) (note 2) 0.5 1.5 ? e t e m p e r a t u r e 0 . 0 7 0 . 7 5 in p u t o ffs e t v o lta g e (n o te 5 ) v os m a x 4 2 5 0 a a u k 1 . 8 5 mv i n p u t o f f s e t v o l t a g e t e m p c o t c v os 0.3 ?/? t a = +25? 0.1 1 t a = -40? to +85? 50 in p u t b ia s c u rre n t i b (n o te 6 ) t a = - 4 0 c t o + 1 2 5 c 1 5 0 0 pa t a = +25? 0.1 1 t a = -40? to +85? 10 in p u t o ffs e t c u rre n t i os (n o te 6 ) t a = - 4 0 c t o + 1 2 5 c 1 0 0 pa d iffe re n tia l in p u t r e s is ta n c e r in 1 0 0 0 g ! e t e m p e r a t u r e - 0 . 2 v d d - 1 . 1 i n p u t c o m m o n - m o d e v o l t a g e r a n g e v cm g u a r a n t e e d b y c m r r t e s t m a x 4 2 5 0 a a u k 0 v d d - 1 . 1 v e t e m p e r a t u r e 7 0 1 1 5 c o m m o n - m o d e r e j e c t i o n r a t i o c m r r v ss - 0 .2 v v cm v dd - 1 .1 v m a x 4 2 5 0 a a u k 6 8 db
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps maxim integrated 3 max4249?ax4257 electrical characteristics (continued) (v dd = 5v, v ss = 0v, v cm = 0v, v out = v dd /2, r l connected to v dd /2, shdn = v dd , t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (notes 2, 3) parameter symbol conditions min typ max units e t e m p e r a t u r e 7 5 1 0 0 p o w e r - s u p p l y r e j e c t i o n r a t i o p s r r v dd 2 .4 v to 5 .5 v m a x 4 2 5 0 a a u k 7 2 db e t e m p e r a t u r e 8 0 1 1 6 r l = 1 0 k ! to v dd /2; v out = 25mv to v dd 4 . 9 7 v m a x 4 2 5 0 a a u k 7 7 e t e m p e r a t u r e 8 0 1 1 2 l a rg e -s ig n a l v o lta g e g a in a v r l = 1 k ! to v dd /2; v out = 150v to v dd 4 . 7 5 v m a x 4 2 5 0 a a u k 7 7 db e 8 2 5 v dd - v oh a 3 0 e 7 2 0 o u tp u t v o lta g e s w in g v o u t |v i n + - v in- | 1 0 m v ; r l = 1 0 k ! to v dd /2 v ol - v ss a 2 5 mv e 7 7 2 0 0 v dd - v oh a 2 2 5 e 4 7 1 0 0 o u tp u t v o lta g e s w in g v o u t |v i n + - v in- | 1 0 m v , r l = 1 k ! to v dd /2 v ol - v ss a 1 2 5 mv o u tp u t s h o rt-c irc u it c u rre n t i sc 68 ma o u tp u t l e a k a g e c u rre n t i l e a k s h u t d o w n m o d e ( s h d n = v ss ), v out = v ss t o v dd (n o te 2 ) 0.001 1.0 ? s h d n l o g i c l o w v il (n o te 2 ) 0 . 2 x v d d v s h d n l o g ic h ig h v ih (note 2) 0.8 x v dd v s h d n in p u t c u rre n t i il /i ih s h d n = v ss = v dd (note 2) 0.5 1.5 ? in p u t c a p a c ita n c e 11 pf m a x 4 2 5 0 m a x 4 2 5 4 3 g a i n - b a n d w i d t h p r o d u c t g b w m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 22 m h z m a x 4 2 5 0 m a x 4 2 5 4 0.3 s le w r a te s r m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 2.1 v / s p e a k -to -p e a k in p u t-n o is e v o l t a g e e n p-p f = 0 .1 h z to 1 0 h z 7 6 0 n v p-p f = 1 0 h z 27 f = 1 k h z 8.9 in p u t v o lta g e -n o is e d e n s ity e n f = 3 0 k h z 7.9 nv/ hz in p u t c u rre n t-n o is e d e n s ity i n f = 1 k h z 0.5 fa/ hz
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps 4 maxim integrated max4249?ax4257 electrical characteristics (continued) (v dd = 5v, v ss = 0v, v cm = 0v, v out = v dd /2, r l connected to v dd /2, shdn = v dd , t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (notes 2, 3) parameter symbol conditions min typ max units f = 1 k h z 0 . 0 0 0 4 m a x 4 2 5 0 m a x 4 2 5 4 a v = 1 v /v , v out = 2v p-p , r l = 1 k ! to g n d (n o te 7 ) f = 2 0 k h z 0 . 0 0 6 f = 1 k h z 0 . 0 0 1 2 t o ta l h a rm o n ic d is to rtio n p lu s n o i s e t h d + n m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 a v = 1 v /v , v out = 2v p-p , r l = 1 k ! to g n d (n o te 7 ) f = 2 0 k h z 0 . 0 0 7 % c a p a c itiv e -l o a d s ta b ility n o s u s ta in e d o s c illa tio n s 4 0 0 p f m a x 4 2 5 0 m a x 4 2 5 4 , a v = 1 v /v 1 0 g a i n m a r g i n g m m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 , a v = 1 0 v / v 1 2 . 5 db m a x 4 2 5 0 m a x 4 2 5 4 , a v = 1 v /v 7 4 p h a s e m a r g i n m m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 , a v = 1 0 v / v 68 d e g r e e s m a x 4 2 5 0 m a x 4 2 5 4 6 . 7 s e ttlin g t im e t o 0 .0 1 % , v o u t = 2 v s t e p m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 1.6 ? m a x 4 2 5 1 / m a x 4 2 5 3 0 . 8 d e la y t im e to s h u td o w n t sh i vdd = 5 % o f n o r m a l o p e r a t i o n m a x 4 2 4 9 / m a x 4 2 5 6 1 . 2 ? m a x 4 2 5 1 / m a x 4 2 5 3 8 d e la y t im e to e n a b le t en v out = 2.5v, v out settles to 0 . 1 % m a x 4 2 4 9 / m a x 4 2 5 6 3 . 5 ? p o w e r - u p d e l a y t i m e t pu v dd = 0 to 5 v s te p , v out stable to 0.1% 6 s note 2: shdn is available on the max4249/max4251/max4253/max4256 only. note 3: all device specifications are 100% tested at t a = +25?. limits over temperature are guaranteed by design. note 4: guaranteed by the psrr test. note 5: offset voltage prior to reflow on the ucsp. note 6: guaranteed by design. note 7: lowpass-filter bandwidth is 22khz for f = 1khz and 80khz for f = 20khz. noise floor of test equipment = 10nv/ ! hz .
0 10 5 20 15 25 30 35 40 -95 -55 -35 -75 -13 7 28 49 69 90 110 131 152 172 192 max4251/max4256 input offset voltage distribution max4249-57 toc01 v os ( v) number of units 400 units v cm = 0 t a = +25 c -250 -100 -150 -200 -50 0 50 100 150 200 250 -40 0 -20 20 40 60 80 offset voltage vs. temperature max4249-57 toc02 temperature ( c) v cm = 0 v os ( v) -50 0 100 50 150 200 -0.5 1.5 0.5 2.5 3.5 4.5 max4249-57 toc03 input common-mode voltage (v) input offset voltage ( v) v dd = 3v v dd = 5v input offset voltage vs. input common-mode voltage 0 0.3 0.2 0.1 0.4 0.5 0.6 0 4 3 1 2 5 6 7 8 9 1 0 output voltage vs. output load current max4249-57 toc04 output load current (ma) output voltage (v) v dd = 3v or 5v v diff = 10mv v dd - v oh v ol 0 0.03 0.02 0.01 0.04 0.05 0.06 0.07 0.08 0.09 0.10 -40 0 -20 20 60 40 80 output voltage swing (v oh ) vs. temperature max4249-57 toc05 temperature ( c) r l = 1k r l = 10k r l = 100k v dd - v oh (v) 0 0.02 0.01 0.03 0.04 0.05 0.06 -40 0 -20 20 60 40 80 output voltage swing (v ol ) vs. temperature max4249 -57toc06 temperature ( c) v ol (v) r l = 10k r l = 1k r l = 100k 50 70 60 100 90 80 130 120 110 140 0 100 50 150 200 250 large-signal voltage gain vs. output voltage swing max4249-57 toc07 v out swing from either supply (mv) v dd = 3v r l referenced to gnd r l = 2k r l = 20k r l = 200k a v (db) 60 70 80 90 100 110 120 130 140 0 5 0 100 150 200 250 large-signal voltage gain vs. output voltage swing max4249-57 toc08 v out swing from either supply (mv) v dd = 3v r l referenced to gnd r l = 2k r l = 20k r l = 200k a v (db) 50 70 60 100 90 80 130 120 110 140 0 100 50 150 200 250 max4249-57 toc09 large-signal voltage gain vs. output voltage swing v out swing from either supply (mv) v dd = 5v r l referenced to gnd r l = 2k r l = 20k r l = 200k a v (db) ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps maxim integrated 5 max4249?ax4257 t ypical operating characteristics ( v d d = 5 v , v s s = 0 v , v c m = v o u t = v d d / 2 , i n p u t n o i s e f l o o r o f t e s t e q u i p m e n t = 1 0 n v / ! h z f o r a l l d i s t o r t i o n m e a s u r e m e n t s , t a = +25?, unless otherwise noted.)
50 80 70 60 90 100 110 120 130 140 150 0 100 50 150 200 250 max4249-57 toc10 v dd = 5v r l referenced to gnd large-signal voltage gain vs. output voltage swing v out swing from either supply (mv) r l = 2k r l = 20k r l = 200k a v (db) 100 110 105 115 120 125 -40 0 -20 20 60 40 80 large-signal voltage gain vs. temperature max4249-57 toc11 temperature ( c) r l referenced to v dd /2 v dd = 5v a v (db) r l = 1k v out = 150mv to 4.75mv r l = 100k v out = 10mv to 4.99mv r l = 10k v out = 20mv to 4.975mv 0.373 0.374 0.375 0.376 340 380 360 400 420 440 460 -40 0 -20 20 60 40 80 supply current and shutdown supply current vs. temperature max4249-57 toc12 temperature ( c) shutdown supply current ( a) per amplifier shdn = v dd supply current ( a) shdn = v ss 320 340 360 380 400 420 440 0 0.1 0.2 0.3 0.4 0.5 0.6 1.8 2.8 2.3 3.3 3.8 4.3 4.8 5.3 5.5 supply current and shutdown supply current vs. supply voltage max4249-57 toc13 supply voltage (v) supply current ( a) shutdown supply current ( a) per amplifier shdn = v dd shdn = v ss 2000 100 0.001 0.1 1 0.01 5 supply current vs. output voltage max4249-57 toc14 output voltage (v) supply current ( a) 1000 400 v dd = 5v v dd = 3v 40 60 80 120 100 180 160 140 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 input offset voltage vs. supply voltage max4249-57 toc15 supply voltage (v) v os ( v) v cm = 0 v out = v dd /2 r l referenced to gnd r l = 10k r l = 1k r l = 100k 60 -40 100 10k 100k 1m 1k 10m max4250?ax4254 gain and phase vs. frequency -20 -10 0 -30 max4249-57 toc16 frequency (hz) gain (db) phase (degrees) 10 20 30 40 50 180 -180 -108 -72 -36 -144 0 36 72 108 144 gain phase v dd = 3v, 5v r l = 50k c l = 20pf a v = 1000 60 -40 100 10k 100k 1m 1k 10m max4249/max4255/max4256/max4257 gain and phase vs. frequency -20 -10 0 -30 max4249-57 toc17 frequency (hz) gain (db) phase (degrees) 10 20 30 40 50 180 -180 -108 -72 -36 -144 0 36 72 108 144 gain phase v dd = 3v, 5v r l = 50k c l = 20pf a v = 1000 0 -100 -110 1 1 k 10k 100k 1m 10 100 10m max4250?ax4254 power-supply rejection ratio vs. frequency -80 -70 -60 -90 max4249-57 toc18 frequency (hz) psrr (db) -50 -40 -30 -20 -10 psrr+ psrr- v dd = 3v, 5v ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps 6 maxim integrated max4249?ax4257 t ypical operating characteristics (continued) ( v d d = 5 v , v s s = 0 v , v c m = v o u t = v d d / 2 , i n p u t n o i s e f l o o r o f t e s t e q u i p m e n t = 1 0 n v / ! h z f o r a l l d i s t o r t i o n m e a s u r e m e n t s , t a = +25?, unless otherwise noted.)
1000 0.1 1k 10k 100k 1m 10m output impedance vs. frequency max4249-57 toc19 frequency (hz) output impedance ( ) 1 10 100 a v = 1 (max4250?ax4254) a v = 10 (max4249/max4255/ max4256/max4257) 30 0 10 100 1k 10k 100k input voltage-n0ise density vs. frequency max4249-57 toc20 frequency (hz) vn-equivalent input noise-voltage (nv/ hz) 5 10 15 20 25 200nv/div 1s/div 0.1hz to 10hz p-p noise max4249-57 toc21 v dd = 3v or 5v v p-p noise = 760nv p-p -160 -140 -120 -100 -80 -60 -40 -20 0 max4250?ax4254 fft of distortion and noise frequency (hz) amplitude (dbc) 10 5k 10k 15k 20k max4249-57 toc22 r l = 1k f o = 1khz a v = 1 f o hd2 hd3 hd4 hd5 v out = 2v p-p -140 -120 -100 -80 -60 -40 -20 0 20 10 5k 10k 15k 20k max4249/max4255/max4256/max4257 fft of distortion and noise max4249-57 toc23 frequency (hz) amplitude (dbc) v out = 4v p-p f o = 1khz hd2 hd3 v in 10k 100k 11k f o v o 0.001 0.01 0.1 1 10 0 2 1 3 4 5 max4250?ax4254 total harmonic distortion plus noise vs. output voltage (v dd = 5v) max4249-57 toc24 output voltage (v p-p ) thd+n (%) v in r l = 1k 100k 11k a v = 10 f o = 3khz filter bw = 30khz v o r l r l = 10k r l = 100k 0.001 0.01 0.1 1 10 0 2 1 3 max4249-57 toc25 output voltage (v p-p ) thd+n (%) 100k 11k max4250?ax4254 total harmonic distortion plus noise vs. output voltage swing (v dd = 3v) v out v in r l r l = 1k r l = 10k r l = 100k a v = 10 f o = 3khz filter bw = 30khz 0.001 0.01 0.1 1 0 3 4 1 2 5 max4249-57 toc26 output voltage (v p-p ) thd+n (%) f o = 20khz, filter bw = 80khz 100k 11k max4249/max4255/max4256/max4257 total harmonic distortion plus noise vs. output voltage swing v out v in r l a v = 10 f o = 3khz, filter bw = 30khz 0.0001 0.01 0.001 0.1 1 10 1k 100 10k max4250?ax4254 total harmonic distortion plus noise vs. frequency max4249-57 toc27 frequency (hz) thd+n (%) r2 r1 r1 = 560 , r2 = 53k v in v out r l a v = 100 a v = 10 r1 = 5.6k , r2 = 53k filter bw = 22khz r l = 10k to gnd v o = 2v p-p a v = 1 ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps maxim integrated 7 max4249?ax4257 t ypical operating characteristics (continued) ( v d d = 5 v , v s s = 0 v , v c m = v o u t = v d d / 2 , i n p u t n o i s e f l o o r o f t e s t e q u i p m e n t = 1 0 n v / ! h z f o r a l l d i s t o r t i o n m e a s u r e m e n t s , t a = +25?, unless otherwise noted.)
0.0001 0.001 0.01 0.1 10 1k 100 10k max4250?ax4254 total harmonic distortion plus noise vs. frequency max4249-57 toc28 frequency (hz) thd+n(%) filter bw = 80khz a v = 1 r l = 1k v out = 2v p-p r l to v dd /2 r l to gnd r l to v dd v out 200mv/div 1.5v 0.5v 2 s/div max4250?ax4254 large-signal pulse response max4249-57 toc29 v dd = 3v r l = 10k c l = 100pf v in = 1v pulse 0.6v 0.5v max4249-57 toc30 max4250?ax4254 small-signal pulse response v out 20mv/div v dd = 3v r l = 10k c l = 100pf v in = 100v pulse 2 s/div 2v 1v max4249/max4255/max4256/max4257 large-signal pulse response max4249-57 toc31 v out 200mv/div v dd = 3v r l = 10k c l = 100pf v in = 100mv pulse a v = 10 2 s/div 1.6v 1.5v max4249/max4255/max4256/max4257 small-signal pulse response max4249-57 toc32 v out 50mv/div v dd = 3v r l = 10k c l = 100pf v in = 10mv pulse a v = 10 2 s/div 140 130 0 channel separation vs. frequency max4249-57 toc33 frequency (hz) channel separation (db) 100 110 120 90 80 70 1k 100k 1m 10k 10m ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps 8 maxim integrated max4249?ax4257 t ypical operating characteristics (continued) ( v d d = 5 v , v s s = 0 v , v c m = v o u t = v d d / 2 , i n p u t n o i s e f l o o r o f t e s t e q u i p m e n t = 1 0 n v / ! h z f o r a l l d i s t o r t i o n m e a s u r e m e n t s , t a = +25?, unless otherwise noted.)
detailed description t h e m a x 4 2 4 9 m a x 4 2 5 7 s i n g l e - s u p p l y o p e r a t i o n a l a m p l i f i e r s f e a t u r e u l t r a - l o w n o i s e a n d d i s t o r t i o n w h i l e consuming very little power. their low distortion and low noise make them ideal for use as preamplifiers in wide d y n a m i c - r a n g e a p p l i c a t i o n s , s u c h a s 1 6 - b i t a n a l o g - t o - digital converters (see typical operating circuit ). their high-input impedance and low noise are also useful for s i g n a l c o n d i t i o n i n g o f h i g h - i m p e d a n c e s o u r c e s , s u c h as piezoelectric transducers. t h e s e d e v i c e s h a v e t r u e r a i l - t o - r a i l o u t p u t o p e r a t i o n , drive loads as low as 1k " while maintaining dc accura- cy, and can drive capacitive loads up to 400pf without o s c i l l a t i o n . t h e i n p u t c o m m o n - m o d e v o l t a g e r a n g e extends from v dd - 1.1v to 200mv beyond the negative rail. the push-pull output stage maintains excellent dc characteristics, while delivering up to ?ma of current. the max4250?254 are unity-gain stable, whereas, the max4249/max4255/max4256/max4257 have a higher s l e w r a t e a n d a r e s t a b l e f o r g a i n s # 1 0 v / v . t h e m a x 4 2 4 9 / m a x 4 2 5 1 / m a x 4 2 5 3 / m a x 4 2 5 6 f e a t u r e a l o w - power shutdown mode, which reduces the supply cur- rent to 0.5? and disables the outputs. the max4250aauk is specified for operation over the automotive (-40? to +125?) temperature range. pin/bump description pin/bump m a x 4 2 5 0 / m a x 4 2 5 5 m a x 4 2 5 1 / m a x 4 2 5 6 m a x 4 2 5 2 / m a x 4 2 5 7 m a x 4 2 5 2 m a x 4 2 4 9 / m a x 4 2 5 3 m a x 4 2 5 4 5-pin sot23 8-pin so/ max 8-pin so/ max 8-bump ucsp 10-bump ucsp 10-pin max 1 4 - pin so 14-pin so name function 1 6 1 , 7 a 1 , a 3 a 1 , c 1 1 , 9 1 , 1 3 1 , 7 , 8 , 14 o u t , o u t a , o u t b , o u t c , o u t d a m p lifie r o u tp u t 2 4 4 c 2 b 4 4 4 1 1 v ss n e g a tiv e s u p p ly . c o n n e c t t o g ro u n d fo r s in g le - s u p p ly o p e ra tio n 3 3 3 , 5 c 1 , c 3 a 3 , c 3 3 , 7 3 , 1 1 3 , 5 , 1 0 , 12 i n + , i n a + , i n b + , i n c + , i n d + n o n in v e rtin g a m p lifie r in p u t 4 2 2 , 6 b 1 , b 3 a 2 , c 2 2 , 8 2 , 1 2 2 , 6 , 9 , 13 in -, in a -, i n b - , in c -, in d - in v e rtin g a m p lifie r in p u t 5 7 8 a 2 b 1 1 0 1 4 4 v dd p o s itiv e s u p p ly 8 a 4 , c 4 5 , 6 6 , 9 shdn , shdna , shdnb s h u td o w n in p u t, connect to v dd o r le a v e u n c o n n e c te d fo r n o rm a l o p e ra tio n (a m p lifie r(s ) e n a b l e d ) . 1 , 5 5 , 7 , 8 , 1 0 n . c . n o c o n n e c t i o n . n o t in te rn a lly c o n n e c t e d . b 2 b 2 , b 3 n o t p o p u l a t e d w ith s o ld e r s p h e r e ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps maxim integrated 9 max4249?ax4257
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps 10 maxim integrated max4249?ax4257 low distortion many factors can affect the noise and distortion that the d e v i c e c o n t r i b u t e s t o t h e i n p u t s i g n a l . t h e f o l l o w i n g g u i d e l i n e s o f f e r v a l u a b l e i n f o r m a t i o n o n t h e i m p a c t o f design choices on total harmonic distortion (thd). choosing proper feedback and gain resistor values for a particular application can be a very important factor i n r e d u c i n g t h d . i n g e n e r a l , t h e s m a l l e r t h e c l o s e d - l o o p g a i n , t h e s m a l l e r t h e t h d g e n e r a t e d , e s p e c i a l l y w h e n d r i v i n g h e a v y r e s i s t i v e l o a d s . l a r g e - v a l u e f e e d - back resistors can significantly improve distortion. the t h d o f t h e p a r t n o r m a l l y i n c r e a s e s a t a p p r o x i m a t e l y 2 0 d b p e r d e c a d e , a s a f u n c t i o n o f f r e q u e n c y . o p e r a t i n g t h e d e v i c e n e a r o r a b o v e t h e f u l l - p o w e r bandwidth significantly degrades distortion. referencing the load to either supply also improves the part? distortion performance, because only one of the mosfets of the push-pull output stage drives the out- p u t . r e f e r e n c i n g t h e l o a d t o m i d s u p p l y i n c r e a s e s t h e part? distortion for a given load and feedback setting. (see the total harmonic distortion vs. frequency graph in the typical operating characteristics .) f o r g a i n s # 1 0 v / v , t h e d e c o m p e n s a t e d d e v i c e s m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 d e l i v e r t h e b e s t d i s t o r t i o n p e r f o r m a n c e , s i n c e t h e y h a v e a h i g h e r slew rate and provide a higher amount of loop gain for a g i v e n c l o s e d - l o o p g a i n s e t t i n g . c a p a c i t i v e l o a d s b e l o w 4 0 0 p f , d o n o t s i g n i f i c a n t l y a f f e c t d i s t o r t i o n r e s u l t s . d i s t o r t i o n p e r f o r m a n c e r e m a i n s r e l a t i v e l y c o n - stant over supply voltages. low noise t h e a m p l i f i e r s i n p u t - r e f e r r e d , n o i s e - v o l t a g e d e n s i t y i s dominated by flicker noise at lower frequencies, and by thermal noise at higher frequencies. because the ther- mal noise contribution is affected by the parallel combi- n a t i o n o f t h e f e e d b a c k r e s i s t i v e n e t w o r k ( r f | | r g , figure 1), these resistors should be reduced in cases where the system bandwidth is large and thermal noise i s d o m i n a n t . t h i s n o i s e c o n t r i b u t i o n f a c t o r d e c r e a s e s , however, with increasing gain settings. for example, the input noise-voltage density of the cir- cuit with r f = 100k " , r g = 11k " (a v = 10v/v) is e n = 15nv/ ! hz , e n can be reduced to 9nv/ ! hz by choosing r f = 10k " , r g = 1.1k " (a v = 10v/v), at the expense o f g r e a t e r c u r r e n t c o n s u m p t i o n a n d p o t e n t i a l l y h i g h e r distortion. for a gain of 100v/v with r f = 100k " , r g = 1.1k " , the e n is low (9nv/ ! hz ). c z r f v out v in r g 0 100mv a v = 2v/v r f = r g = 10k v in = 50mv/div v out = 100mv/div 2 s/div 0 100mv a v = 2 r f = r g = 100k c z = 11pf 50mv/div 100mv/div v in v out 2 s/div figure 1. adding feed-forward compensation figure 2a. pulse response with no feed-forward compensation figure 2b. pulse response with 10pf feed-forward compensation
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps maxim integrated 11 max4249?ax4257 using a feed-forward compensation capacitor, c z the amplifier? input capacitance is 11pf. if the resis- t a n c e s e e n b y t h e i n v e r t i n g i n p u t i s l a r g e ( f e e d b a c k network), this can introduce a pole within the amplifier? b a n d w i d t h , r e s u l t i n g i n r e d u c e d p h a s e m a r g i n . compensate the reduced phase margin by introducing a f e e d - f o r w a r d c a p a c i t o r ( c z ) b e t w e e n t h e i n v e r t i n g input and the output (figure 1). this effectively cancels t h e p o l e f r o m t h e i n v e r t i n g i n p u t o f t h e a m p l i f i e r . choose the value of c z as follows: c z = 11 x (r f / r g ) [pf] i n t h e u n i t y - g a i n s t a b l e m a x 4 2 5 0 m a x 4 2 5 4 , t h e u s e o f a p r o p e r c z i s m o s t i m p o r t a n t f o r a v = 2 v / v , a n d a v = - 1 v / v . i n t h e d e c o m p e n s a t e d m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / m a x 4 2 5 7 , c z i s m o s t i m p o r t a n t f o r a v = 1 0 v / v . f i g u r e s 2 a a n d 2 b s h o w t r a n s i e n t r e s p o n s e b o t h w i t h a n d w i t h o u t c z . using a slightly smaller c z than suggested by the for- m u l a a b o v e a c h i e v e s a h i g h e r b a n d w i d t h a t t h e expense of reduced phase and gain margin. as a gen- eral guideline, consider using c z for cases where r g || r f i s g r e a t e r t h a n 2 0 k " ( m a x 4 2 5 0 m a x 4 2 5 4 ) o r g r e a t e r t h a n 5 k " ( m a x 4 2 4 9 / m a x 4 2 5 5 / m a x 4 2 5 6 / max4257). a pplications infor mation t h e m a x 4 2 4 9 m a x 4 2 5 7 c o m b i n e g o o d d r i v i n g c a p a - b i l i t y w i t h g r o u n d - s e n s i n g i n p u t a n d r a i l - t o - r a i l o u t p u t operation. with their low distortion, low noise, and low- power consumption, these devices are ideal for use in portable instrumentation systems and other low-power, noise-sensitive applications. ground-sensing and rail-to-rail outputs t h e c o m m o n - m o d e i n p u t r a n g e o f t h e s e d e v i c e s e x t e n d s b e l o w g r o u n d , a n d o f f e r s e x c e l l e n t c o m m o n - m o d e r e j e c t i o n . t h e s e d e v i c e s a r e g u a r a n t e e d n o t t o u n d e r g o p h a s e r e v e r s a l w h e n t h e i n p u t i s o v e r d r i v e n (figure 3). f i g u r e 4 s h o w c a s e s t h e t r u e r a i l - t o - r a i l o u t p u t o p e r a - t i o n o f t h e a m p l i f i e r , c o n f i g u r e d w i t h a v = 1 0 v / v . t h e o u t p u t s w i n g s t o w i t h i n 8 m v o f t h e s u p p l i e s w i t h a 1 0 k " l o a d , m a k i n g t h e d e v i c e s i d e a l i n l o w - s u p p l y - v o l t a g e a p p l i c a t i o n s . output loading and stability e v e n w i t h t h e i r l o w q u i e s c e n t c u r r e n t o f 4 0 0 a , t h e s e amplifiers can drive 1k " loads while maintaining excel- lent dc accuracy. stability while driving heavy capaci- tive loads is another key feature. v out v in r iso c l max4250 max4251 max4252 max4253 max4254 4.25v 4.45v -200mv 0 0 v out v in a v = 1 v dd = 5v r l = 10k 20 s/div 0 5v v dd = 5v r l = 10k a v = 10 f = 1khz 200 s/div v out 1v/div figure 3. overdriven input showing no phase reversal figure 4. rail-to-rail output operation figure 5. capacitive-load driving circuit
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps 12 maxim integrated max4249?ax4257 these devices maintain stability while driving loads up t o 4 0 0 p f . t o d r i v e h i g h e r c a p a c i t i v e l o a d s , p l a c e a small isolation resistor in series between the output of t h e a m p l i f i e r a n d t h e c a p a c i t i v e l o a d ( f i g u r e 5 ) . t h i s r e s i s t o r i m p r o v e s t h e a m p l i f i e r s p h a s e m a r g i n b y i s o - l a t i n g t h e c a p a c i t o r f r o m t h e o p a m p s o u t p u t . reference figure 6 to select a resistance value that will ensure a load capacitance that limits peaking to <2db ( 2 5 % ) . f o r e x a m p l e , i f t h e c a p a c i t i v e l o a d i s 1 0 0 0 p f , t h e c o r r e s p o n d i n g i s o l a t i o n r e s i s t o r i s 1 5 0 " . f i g u r e 7 s h o w s t h a t p e a k i n g o c c u r s w i t h o u t t h e i s o l a t i o n r e s i s - tor. figure 8 shows the unity-gain bandwidth vs. capac- itive load for the max4250?ax4254. power supplies and layout the max4249?ax4257 operate from a single 2.4v to 5.5v power supply or from dual supplies of ?.20v to ?.75v. for single-supply operation, bypass the power supply with a 0.1? ceramic capacitor placed close to t h e v d d p i n . i f o p e r a t i n g f r o m d u a l s u p p l i e s , b y p a s s each supply to ground. good layout improves performance by decreasing the amount of stray capacitance and noise at the op amp? inputs and output. to decrease stray capacitance, min- i m i z e p c b o a r d t r a c e l e n g t h s a n d r e s i s t o r l e a d s , a n d place external components close to the op amp? pins. 160 140 0 10 10,000 60 20 40 120 100 80 capacitive loading (pf) 1000 100 shaded area indicates stable operation with no need for isolation resistor. note: using an isolation resistor reduces peaking. r iso ( ) 4.5 3.5 4.0 0 10 10,000 2.0 3.0 2.5 1.0 0.5 1.5 capacitive load (pf) unity-gain bandwidth (mhz) 1000 100 v dd = 3v shaded area indicates stable operation with no need for isolation resistor. note: r iso chosen for peaking < 2db. 25 20 0 10 10,000 15 5 10 capacitive load (pf) peaking (db) 1000 100 max4250?ax4254 (a v = 1) max4249/max4255?ax4257 (a v = 10) r iso = 0 shaded area indicates stable operation with no need for isolation resistor. figure 6. isolation resistance vs. capacitive loading to minimize peaking (<2db) figure 7. peaking vs. capacitive load figure 8. max4250?ax4254 unity-gain bandwidth vs. capacitive load
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps maxim integrated 13 max4249?ax4257 t y p i c a l o p e r a t i n g c i r c u i t max195 (16-bit adc) serial interface dout sclk shdn shdn ain v in ref -5v 2 50k 5v 3 4 6 7 8 5k v dd v ss 4.096v cs max4256 selector guide part g a i n b a n d w i d t h ( m h z ) minimum stable gain (v/v) no. of amplifiers per package s h u t d o w n mode pin-package m a x 4 2 4 9 2 2 1 0 2 y e s 1 0 -p in m a x , 1 4 -p in s o m a x 4 2 5 0 / a 3 1 1 5 - p i n s o t 2 3 m a x 4 2 5 1 3 1 1 y e s 8 - p i n m a x / s o m a x 4 2 5 2 3 1 2 8 - p i n m a x / s o , 8 - b u m p u c s p m a x 4 2 5 3 3 1 2 y e s 1 0 -p in m a x , 1 4 -p in s o , 1 0 - b u m p u c s p m a x 4 2 5 4 3 1 4 1 4 - p i n s o m a x 4 2 5 5 2 2 1 0 1 5 - p i n s o t 2 3 m a x 4 2 5 6 2 2 1 0 1 y e s 8 - p i n m a x / s o m a x 4 2 5 7 2 2 1 0 2 8 - p i n m a x / s o
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps 14 maxim integrated max4249?ax4257 v ss in- in+ 1 5 v dd out max4250 max4250a max4255 sot23 top view 2 3 4 out n.c. v ss 1 2 8 7 shdn v dd in- in+ n.c. max/so 3 4 6 5 max4251 max4256 inb- inb+ v ss 1 2 8 7 v dd outb ina- ina+ outa max/so 3 4 6 5 max4252 max4257 1 2 3 4 5 10 9 8 7 6 v dd outb inb- inb+ v ss ina+ ina- outa max4249 max4253 max shdnb shdna 14 13 12 11 10 9 8 1 2 3 4 5 6 7 v dd outb inb- inb+ v ss ina+ ina- outa max4249 max4253 n.c. shdnb n.c. n.c. shdna n.c. so 14 13 12 11 10 9 8 1 2 3 4 5 6 7 outd ind- ind+ v ss v dd ina+ ina- outa max4254 inc+ inc- outc outb inb- inb+ so + + + + + + p i n / b u m p configurations (continued) part temp range pin- p a c k a g e t o p m a r k max4251 e s a + - 4 0 c t o + 8 5 c 8 s o m a x 4 2 5 1 e u a + - 4 0 c t o + 8 5 c 8 m a x max4252 e b l + t - 4 0 c t o + 8 5 c 8 u c s p a a o m a x 4 2 5 2 e s a + - 4 0 c t o + 8 5 c 8 s o m a x 4 2 5 2 e u a + - 4 0 c t o + 8 5 c 8 m a x max4253 e b c + t - 4 0 c t o + 8 5 c 1 0 u c s p a a k m a x 4 2 5 3 e u b + - 4 0 c t o + 8 5 c 1 0 m a x m a x 4 2 5 3 e s d + - 4 0 c t o + 8 5 c 1 4 s o max4254 e s d + - 4 0 c t o + 8 5 c 1 4 s o max4255 e u k + t - 4 0 c t o + 8 5 c 5 s o t 2 3 a c c j max4256 e s a + - 4 0 c t o + 8 5 c 8 s o m a x 4 2 5 6 e u a + - 4 0 c t o + 8 5 c 8 m a x max4257 e s a + - 4 0 c t o + 8 5 c 8 s o m a x 4 2 5 7 e s a / v + t - 4 0 c t o + 8 5 c 8 s o m a x 4 2 5 7 e u a + - 4 0 c t o + 8 5 c 8 m a x or dering infor mation (continued)
ucsp, single-supply, low-noise, low-distortion, rail-to-rail op amps maxim integrated 15 max4249?ax4257 package type package code outline no. land pattern no. 5 sot-23 u5+2 21-0057 90-0174 8 max u8+1 21-0036 90-0092 10 max u10+2 21-0061 90-0330 3 x 3 csp b9+5 21-0093 14 soic s14+1 21-0041 90-0112 12 csp b12+4 21-0104 package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a "+", "#", or "-" in the package code indicates rohs status only. package drawings may show a different suffix character, but th e drawing pertains to the package regardless of rohs status.
ucsp , single-supply , low-noise, low-distor tion, rail-to-rail op amps max4249?ax4257 m a x i m i n t e g r a t e d c a n n o t a s s u m e r e s p o n s i b i l i t y f o r u s e o f a n y c i r c u i t r y o t h e r t h a n c i r c u i t r y e n t i r e l y e m b o d i e d i n a m a x i m i n t e g r a t e d p r o d u c t . n o c i r c u i t p a t e n t l i c e n s e s a r e i m p l i e d . m a x i m i n t e g r a t e d r e s e r v e s t h e r i g h t t o c h a n g e t h e c i r c u i t r y a n d s p e c i f i c a t i o n s w i t h o u t n o t i c e a t a n y t i m e . t h e p a r a m e t r i c v a l u e s ( m i n a n d m a x l i m i t s ) s h o w n i n t h e e l e c t r i c a l c h a r a c t e r i s t i c s t a b l e a r e g u a r a n t e e d . o t h e r p a r a m e t r i c v a l u e s q u o t e d i n t h i s d a t a s h e e t a r e p r o v i d e d f o r g u i d a n c e . 16 maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 2012 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products , inc. r e v i s i o n h i s t o r y revision n u m b e r revision date description p a g e s c h a n g e d 8 1 0 / 1 1 a d d e d le a d -fre e p a c k a g in g to th e o rd e rin g in fo rm a tio n a n d c h a n g e d th e in p u t b ia s c u rre n t a n d in p u t o ffs e t c u rre n t c o n d itio n s in th e e le c tric a l c h a ra c te ris tic s t a b l e 1 , 2 , 1 4 9 1 2 / 1 2 a d d e d m a x 4 2 5 7 e s a / v + t t o o rd e rin g in fo rm a tio n . 1 4

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