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general description the max4475?ax4478/max4488/max4489 wide- band, low-noise, low-distortion operational amplifiers offer rail-to-rail outputs and single-supply operation down to 2.7v. they draw 2.2ma of quiescent supply current per amplifier while featuring ultra-low distortion (0.0002% thd + n), as well as low input voltage noise density (4.5nv/ hz ) and low input current noise density (0.5fa/ hz ). these features make the devices an ideal choice for applications that require low distortion and/or low noise. for power conservation, the max4475/max4488 offer a low-power shutdown mode that reduces supply current to 0.01? and places the amplifiers?outputs into a high- impedance state. these amplifiers have outputs which swing rail-to-rail and their input common-mode voltage range includes ground. the max4475?ax4478 are unity-gain stable with a gain-bandwidth product of 10mhz. the max4488/max4489 are internally compen- sated for gains of +5v/v or greater with a gain-band- width product of 42mhz. the single max4475/ max4476/max4488 are available in space-saving, 6-pin sot23 packages. applications adc buffers dac output amplifiers low-noise microphone/preamplifiers digital scales strain gauges/sensor amplifiers medical instrumentation features low input voltage noise density: 4.5nv/ hz low input current noise density: 0.5fa/ hz low distortion: 0.0002% thd + n (1k ? load) single-supply operation from +2.7v to +5.5v input common-mode voltage range includes ground rail-to-rail output swings with a 1k ? load 10mhz gbw product, unity-gain stable (max4475?ax4478) 42mhz gbw product, stable with a v +5v/v (max4488/max4489) excellent dc characteristics v os = 70? i bias = 1pa large-signal voltage gain = 120db low-power shutdown mode: reduces supply current to 0.01? places output in high-impedance state available in space-saving sot23, ?ax, and tssop packages max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps ________________________________________________________________ maxim integrated products 1 ordering information selector guide 19-2137; rev 0; 8/01 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information continued at end of data sheet. pin configurations and typical operating circuit appear at end of data sheet. rail-to-rail is a registered trademark of nippon motorola, ltd. part temp. range pin- package top mark max4475 aut-t -40 c to +125 c 6 sot23-6 aazv max4475aua -40 c to +125 c 8 max max4475asa -40 c to +125 c 8 so max4476 aut-t -40 c to +125 c 6 sot23-6 aazx part g a in b w ( m h z) stable gain (v/v) no. of amps shdn max4475 10 1 1 yes max4476 10 1 1 max4477 10 1 2 max4478 10 1 4 max4488 42 5 1 yes max4489 42 5 2 25 20 10 5 0 10 1k 10k 100 100k input voltage noise density vs. frequency max4475 toc20 frequency (hz) 15 v in equivalent input noise voltage (nv/ hz) typical operating characteristic
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, shdn = v dd , t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c) (notes 1, 2) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. power supply voltage (v dd to v ss ) ......................-0.3v to +6.0v analog input voltage (in_+, in_-)....(v ss - 0.3v) to (v dd + 0.3v) shdn input voltage....................................(v ss - 0.3v) to +6.0v output short-circuit duration to either supply ..........continuous continuous power dissipation (t a = +70 c) 6-pin sot23 (derate 9.1mw/ c above +70 c)...........727mw 8-pin max (derate 4.5mw/ c above +70 c) ............362mw 8-pin so (derate 5.88mw/ c above +70 c)...............471mw 14-pin so (derate 8.33mw/ c above +70 c)..............667mw 14-pin tssop (derate 9.1mw/ c above +70 c) .........727mw operating temperature range .........................-40 c to +125 c junction temperature ......................................................+150 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c parameter symbol conditions min typ max units supply voltage range v dd (note 3) 2.7 5.5 v v dd = 3v 2.2 normal mode v dd = 5v 2.5 4.4 ma quiescent supply current per amplifier i d shutdown mode ( shdn = v ss ) (note 2) 0.01 1.0 a t a = +25 c 70 350 input offset voltage v os t a = -40 c to +125 c 750 v input offset voltage tempco tc vos 0.3 6 v/ c input bias current i b (note 4) 1 150 pa input offset current i os (note 4) 1 150 pa differential input resistance r in 1000 g ? t a = +25 c-0.2v d d - 1.6 input common-mode voltage range v cm guaranteed by cmrr test t a = -40 c to +125 c-0.1 v d d - 1.7 v (v ss - 0.2v) v cm (v dd - 1.6v) t a = +25 c 90 115 common-mode rejection ratio cmrr (v ss - 0.1v) v cm (v dd - 1.7v) t a = -40 c to +125 c90 db power-supply rejection ratio psrr v dd = 2.7 to 5.5v 90 120 db r l = 10k ? to v dd /2; v out = 100mv to (v dd - 125mv) 90 120 r l = 1k ? to v dd /2; v out = 200mv to (v dd - 250mv) 85 110 large-signal voltage gain a vol r l = 500 ? to v dd /2; v out = 350mv to (v dd - 500mv) 85 110 db
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps _______________________________________________________________________________________ 3 dc electrical characteristics (continued) (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, shdn = v dd , t a = -40 c to +125 c, unless otherwise noted. typical values are at t a = +25 c) (notes 1, 2) ac electrical characteristics (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, shdn = v dd , t a = +25 c.) parameter symbol conditions min typ max units v dd - v oh 10 45 |v in+ - v in- | 10mv r l = 10k ? to v dd /2 v ol - v ss 10 40 v dd - v oh 80 200 |v in+ - v in- | 10mv, r l = 1k ? to v dd /2 v ol - v ss 50 150 v dd - v oh 100 300 output voltage swing v out |v in+ - v in- | 10mv, r l = 500 ? to v dd /2 v ol - v ss 80 250 mv output short-circuit current i sc 48 ma output leakage current i leak shutdown mode ( shdn = v ss ), v out = v ss to v dd 0.001 1.0 a shdn logic low v il 0.3 x v d d v shdn logic high v ih 0.7 x v dd v shdn input current shdn = v ss to v dd 0.01 1 a input capacitance c in 10 pf parameter symbol conditions min typ max units max4475 max4478 a v = +1v/v 10 gain-bandwidth product gbwp max4488/max4489 a v = +5v/v 42 mhz max4475 max4478 a v = +1v/v 3 slew rate sr max4488/max4489 a v = +5v/v 10 v/s max4475 max4478 a v = +1v/v 0.4 full-power bandwidth (note 5) max4488/max4489 a v = +5v/v 1.25 mhz peak-to-peak input noise voltage e n( p - p ) f = 0.1hz to 10hz 260 nvp-p f = 10hz 21 f = 1khz 4.5 input voltage noise density e n f = 30khz 3.5 nv/ hz input current noise density i n f = 1khz 0.5 fa/ hz f = 1khz 0.0002 v out = 2vp-p, a v = +1v/v, (max4475 max4478) r l = 10k ? to gnd f = 20khz 0.0007 f = 1khz 0.0002 v out = 2vp-p, a v = +1v/v, (max4475 max4478) r l = 1k ? to gnd f = 20khz 0.001 f = 1khz 0.0004 total harmonic distortion plus noise (note 6) thd+n v out = 2vp-p, a v = +5v/v, max4488/max4489 r l = 10k ? to gnd f = 20khz 0.0006 %
4 2 10 8 6 12 14 16 18 -50 -30 -20 -40 -100 1020304050 input offset voltage distribution max4475-8 toc1 v os ( v) percentage of units (%) 0 -250 -100 -150 -200 0 -50 200 150 100 50 250 -50 -25 0 25 50 75 100 125 offset voltage vs. temperature max4475 toc02 temperature ( c) input offset voltage ( v) v com = 0 0 10 30 20 40 50 -0.5 1.5 0.5 2.5 3.5 4.5 input offset voltage vs. input common-mode voltage max4475 toc03 input common-mode voltage (v) input offset voltage ( v) v dd = 3v v dd = 5v typical operating characteristics (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, input noise floor of test equipment =10nv/ hz for all distortion mea- surements, t a = +25 c, unless otherwise noted.) max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps 4 _______________________________________________________________________________________ note 1: all devices are 100% tested at t a = +25 c. limits over temperature are guaranteed by design. note 2: shdn is available on the max4475/max4488 only. note 3: guaranteed by the psrr test. note 4: guaranteed by design. note 5: full-power bandwidth for unity-gain stable devices (max4475 max4478) is measured in a closed-loop gain of +2v/v to accommodate the input voltage range, v out = 4vp-p. note 6: lowpass-filter bandwidth is 22khz for f = 1khz and 80khz for f = 20khz. noise floor of test equipment = 10nv/ hz . parameter symbol conditions min typ max units f = 1khz 0.0005 total harmonic distortion plus noise (note 6) thd+n v out = 2vp-p, a v = +5v/v, max4488/max4489 r l = 1k ? to gnd f = 20khz 0.008 % capacitive load stability no sustained oscillations 200 pf gain margin gm 12 db max4475 max4478, a v = +1v/v 70 phase margin m max4488/max4489, a v = +5v/v 80 degrees settling time to 0.01%, v out = 2v step 2 s delay time to shutdown t sh 1.5 s enable delay time from shutdown t en v out = 2.5v, v out settles to 0.1% 10 s power-up delay time v dd = 0 to 5v step, v out stable to 0.1% 13 s ac electrical characteristics (continued) (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, shdn = v dd , t a = +25 c.)
typical operating characteristics (continued) (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, input noise floor of test equipment =10nv/ hz for all distortion mea- surements, t a = +25 c, unless otherwise noted.) max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps _______________________________________________________________________________________ 5 0 0.05 0.10 0.15 0.20 0.25 045 23 1678910 output voltage vs. output load current max4475 toc04 output load current (ma) output voltage (v) v dd - v oh v ol v dd = 3v or 5v v diff = 10mv 0 20 10 40 30 60 50 70 -50 0 25 -25 50 75 100 125 output voltage swing (v oh ) vs. temperature max4475 toc05 temperature ( c) v dd - v oh (mv) r l = 1k ? r l = 10k ? 0 20 10 40 30 60 50 70 -50 0 25 -25 50 75 100 125 output voltage swing (v ol ) vs. temperature max4475 toc06 temperature ( c) v ol (mv) r l = 1k ? r l = 10k ? 50 60 70 80 90 100 110 120 130 0 50 100 150 200 250 large-signal voltage gain vs. output voltage swing max4475 toc07 v out swing from either supply (mv) a v (db) r l = 200k ? r l = 20k ? r l = 2k ? v dd = 3v r l referenced to gnd 50 60 70 80 90 100 110 120 130 0 50 100 150 200 250 large-signal voltage gain vs. output voltage swing max4475 toc08 v out swing from either supply (mv) a v (db) r l = 200k ? r l = 20k ? r l = 2k ? v dd = 3v r l referenced to v dd 50 60 70 80 90 100 110 120 130 0 50 100 150 200 250 large-signal voltage gain vs. output voltage swing max4475 toc09 v out swing from either supply (mv) a v (db) r l = 200k ? r l = 20k ? r l = 2k ? v dd = 5v r l referenced to gnd 50 60 70 80 90 100 110 120 130 0 50 100 150 200 250 large-signal voltage gain vs. output voltage swing max4475 toc10 v out swing from either supply (mv) a v (db) r l = 200k ? r l = 2k ? r l = 20k ? v dd = 5v r l referenced to v dd 50 70 60 100 90 80 130 120 110 140 -50 0 25 -25 50 75 100 125 large-signal voltage gain vs. temperature max4475 toc11 temperature ( c) a vol (db) r l = 100k ? r l = 10k ? v out = 150mv to 4.75v 0 1.0 0.5 2.0 1.5 2.5 3.0 -50 25 50 -25 0 75 100 125 supply current vs. temperature max4475 toc12 temperature ( c) supply current (ma) per amplifier
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, input noise floor of test equipment =10nv/ hz for all distortion mea- surements, t a = +25 c, unless otherwise noted.) 0 1.0 0.5 2.0 1.5 2.5 3.0 2.5 3.5 4.0 3.0 4.5 5.0 5.5 supply current vs. supply voltage max4475 toc13 supply voltage (v) supply current (ma) per amplifier 0 1.0 0.5 2.0 1.5 2.5 3.0 02 1345 supply current vs. output voltage max4475 toc14 output voltage (v) supply current (ma) v dd = 5v v dd = 3v -20 -15 -10 -5 0 5 10 15 20 2.5 3.5 3.0 4.0 4.5 5.0 5.5 input offset voltage vs. supply voltage max4475 toc15 supply voltage (v) input offset voltage ( v) max4475?ax4478 gain and phase vs. frequency input frequency (hz) 100 100k 1m 10m 1k 10k 100m gain (db) 60 -40 -30 -20 -10 0 10 20 50 40 30 -180 phase (degrees) 180 -144 -108 -72 -36 0 36 144 108 72 max4475 toc16 v dd = 3v or 5v r l = 50k ? c l = 20pf a v = +1000v/v gain phase max4488/max4489 gain and phase vs. frequency input frequency (hz) 100 100k 1m 10m 1k 10k 100m gain (db) 60 -40 -30 -20 -10 0 10 20 50 40 30 -180 phase (degrees) 180 -144 -108 -72 -36 0 36 144 108 72 max4475 toc17 v dd = 3v or 5v r l = 50k ? c l = 20pf a v = +1000v/v gain phase 1000 100,000 -130 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 0 0.001 0.1 10 max4475 max4478 power-supply rejection ratio vs. frequency max4475 toc18 frequency (khz) psrr (db) v dd = 3v or 5v 1000 100 10 1 0.1 0.01 1 100 1k 10 10k output impedance vs. frequency max4475 toc19 frequency (hz) output impedance ( ? ) a v = +5 a v = +1
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps _______________________________________________________________________________________ 7 25 20 10 5 0 10 1k 10k 100 100k input voltage noise density vs. frequency max4475 toc20 frequency (hz) 15 v in equivalent input noise voltage (nv/ hz) 1s/div 0.1hz to 10hzp-p noise v dd = 3v or 5v vp-p noise = 260nvp-p 200nv/div max4475 toc21 max4475 total harmonic distortion plus noise vs. output voltage swing max4475 toc22 output voltage (vp-p) thd + n (%) 10 0.0001 0.001 0.01 0.1 1 02 134 f o = 20khz, filter bw = 80khz f o = 3khz, filter bw = 30khz a v = +1 max4488/max4489 total harmonic distortion plus noise vs. output voltage swing output voltage (vp-p) 02 13 thd + n (%) 10 0.00001 0.0001 0.001 0.01 1 0.1 max4475 toc23 a v = +5 v dd = +3v, f o = 20khz filter bw = 80khz v dd = 3v, f o = 3khz filter bw = 30khz 0.01 0.0001 0 10k 20k max4488/max4489 total harmonic distortion plus noise vs. frequency max4475 toc24 frequency (hz) thd + n (%) 0.001 5k 15k filter bw = 22khz r l = 10k ? to gnd r1 = 5.6k ? , r2 = 53k ? v out = 2vp-p a v = +10, v dd = 3v a v = +10, v dd = 5v 0.01 0.001 020k max4475 max4478 total harmonic distortion plus noise vs. frequency max4475 toc25 frequency (hz) thd + n (%) 5k 10k 15k filter bw = 80khz v out = 2vp-p a v = +1 r l = 1k ? r l to v dd /2 r l to gnd r l to v dd 1 0.0001 0 5k 15k 20k max4488/max4489 total harmonic distortion plus noise vs. frequency 0.001 0.01 0.1 max4475 toc26 frequency (hz) thd + n (%) 10k filter bw = 80khz r l = 10k ? to gnd r1 = 5.6k ? , r2 = 53k ? v out = 2.75vp-p a v = +5, v dd = 3v a v = +5, v dd = 5v typical operating characteristics (continued) (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, input noise floor of test equipment =10nv/ hz for all distortion mea- surements, t a = +25 c, unless otherwise noted.) 1 s/div max4475 max4478 large-signal pulse response v dd = 3v, r l = 10k ? , c l = 100pf v in = 2v 0.5v max4475 toc27 2.5v 4 s/div max4475 max4478 small-signal pulse response v dd = 3v, r l = 10k ? , c l = 100pf v in = 100mv pulse 0.5v max4475 toc28 0.6v 20mv/div
pin description max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps 8 _______________________________________________________________________________________ typical operating characteristics (continued) (v dd = +5v, v ss = 0, v cm = 0, v out = v dd /2, r l tied to v dd /2, input noise floor of test equipment =10nv/ hz for all distortion mea- surements, t a = +25 c, unless otherwise noted.) 1 s/div max4488/max4489 large-signal pulse response v dd = 3v, r l = 10k ? , c l = 50pf v in = 20mv pulse, a v = +5v/v max4475 toc29 v out 200mv/div 1 s/div max4488/max4489 small-signal pulse response v dd = 3v, r l = 10k ? , c l = 50pf v in = 20mv pulse, a v = +5v/v max4475 toc30 v out 50mv/div 1.6v 1.5v -20 -90 10 1000 100 100k 100m 10m max4477/max4478/max4489 crosstalk vs. frequency -60 -50 -40 -30 max4475 toc31 frequency (hz) crosstalk (db) 10k 1m -70 -80 pin max4475/ max4488 max4475/ max4488 max4476 max4477/ max4489 max4478 sot23 8 so/max sot23 8 so/max so/tssop name function 1 6 1 1, 7 1, 7, 8, 14 out, outa, outb, outc, outd amplifier output 24 2 4 11 v ss negative supply. connect to ground for single- supply operation 3 3 3 3, 5 3, 5, 10, 12 in+, ina+, inb+, inc+, ind+ noninverting amplifier input 4 2 4 2, 6 2, 6, 9, 13 in-, ina-, inb-, inc-, ind- inverting amplifier input 67 5 8 4 v dd positive supply 58 shdn shutdown input. connect to v dd for normal operation (amplifier(s) enabled). 1, 5 n.c. no connection. not internally connected.
detailed description the max4475 max4478/max4488/max4489 single- supply operational amplifiers feature ultra-low noise and distortion. their low distortion and low noise make them ideal for use as preamplifiers in wide dynamic- range applications, such as 16-bit analog-to-digital converters (see typical operating circuit ). their high- input impedance and low noise are also useful for sig- nal conditioning of high-impedance sources, such as piezoelectric transducers. these devices have true rail-to-rail ouput operation, drive loads as low as 1k ? while maintining dc accura- cy, and can drive capactive loads up to 200pf without oscillation. the input common-mode voltage range extends from (v dd - 1.6v) to 200mv below the negative rail. the push/pull output stage maintains excellent dc characteristics, while delivering up to 5ma of current. the max4475 max4478 are unity-gain stable, while the max4488/max4489 have a higher slew rate and are stable for gains 5v/v. the max4475/max4488 feature a low-power shutdown mode, which reduces the supply current to 0.01a and disables the outputs. low distortion many factors can affect the noise and distortion that the device contributes to the input signal. the following guidelines offer valuable information on the impact of design choices on total harmonic distortion (thd). choosing proper feedback and gain resistor values for a particular application can be a very important factor in reducing thd. in general, the smaller the closed- loop gain, the smaller the thd generated, especially when driving heavy resistive loads. the thd of the part normally increases at approximately 20db per decade, as a function of frequency. operating the device near or above the full-power bandwidth significantly degrades distortion. referencing the load to either supply also improves the part s distortion performance, because only one of the mosfets of the push/pull output stage drives the out- put. referencing the load to mid-supply increases the part s distortion for a given load and feedback setting. (see the total harmonic distortion vs. frequency graph in the typical operating characteristics .) for gains 5v/v, the decompensated devices max4488/max4489 deliver the best distortion perfor- mance, since they have a higher slew rate and provide a higher amount of loop gain for a given closed-loop gain setting. capacitive loads below 100pf do not sig- nificantly affect distortion results. distortion perfor- mance is relatively constant over supply voltages. max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps _______________________________________________________________________________________ 9 c z r f v out v in r g v out 100mv/div v in 100mv/div 100mv 0 a v = +2 r f = r g = 100k ? 2 s/div figure 1. adding feed-forward compensation figure 2a. pulse response with no feed-forward compensation v out 100mv/div v in 100mv/div a v = +2 r f = r g = 100k ? 2 s/div figure 2b. pulse response with 10pf feed-forward compensation
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps 10 ______________________________________________________________________________________ low noise the amplifier s input-referred noise voltage density is 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- nation of the feedback resistive network (r f || r g , figure 1), these resistors should be reduced in cases where the system bandwidth is large and thermal noise is dominant. this noise contribution factor decreases, 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 = +5v/v) is e n = 14nv/ hz , e n can be reduced to 6nv/ hz by choosing r f = 10k ? , r g = 1.1k ? (a v = +5v/v), at the expense of greater current consumption and potentially higher distortion. for a gain of 100v/v with r f = 100k ? , r g = 1.1k ? , the e n is still a low 6nv/ hz . using a feed-forward compensation capacitor, c z the amplifier s input capacitance is 10pf. if the resis- tance seen by the inverting input is large (feedback network), this can introduce a pole within the amplifier s bandwidth resulting in reduced phase margin. compensate the reduced phase margin by introducing a feed-forward capacitor (c z ) between the inverting input and the output (figure 1). this effectively cancels the pole from the inverting input of the amplifier. choose the value of c z as follows: c z = 10 x (r f / r g ) [pf] in the unity-gain stable max4475 max4478 , the use of a proper c z is most important for a v = +2v/v, and a v = -1v/v. in the decompensated max4488/max4489, c z is most important for a v = +10v/v. figures 2a and 2b show transient response both with and without c z . using a slightly smaller c z than suggested by the for- mula above achieves a higher bandwidth at the expense of reduced phase and gain margin. as a gen- eral guideline, consider using c z for cases where r g || r f is greater than 20k ? (max4475 max4478) or greater than 5k ? (max4488/max4489). applications information the max4475 max4478/max4488/max4489 combine good driving capability with ground-sensing input and rail-to-rail output operation. with their low distortion and low noise, they are ideal for use in adc buffers, med- ical instrumentation systems and other noise-sensitive applications. ground-sensing and rail-to-rail outputs the common-mode input range of these devices extends below ground, and offers excellent common- mode rejection. these devices are guaranteed not to undergo phase reversal when the input is overdriven (figure 3). figure 4 showcases the true rail-to-rail output operation of the amplifier, configured with a v = 5v/v. the output swings to within 8mv of the supplies with a 10k ? load, making the devices ideal in low-supply-voltage applica- tions. power supplies and layout the max4475 max4478/max4488/max4489 operate from a single +2.7v to +5.5v power supply or from dual supplies of 1.35v to 2.75v. for single-supply opera- tion, bypass the power supply with a 0.1f ceramic v out 2v/div v in 2v/div 0 a v = +1 v dd = +5v r l = 10k ? 40 s/div v out 1v/div 5v 0 20 s/div figure 3. overdriven input showing no phase reversal figure 4. rail-to-rail output operation
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps ______________________________________________________________________________________ 11 capacitor placed close to the v dd pin. if operating from dual supplies, bypass each supply to ground. good layout improves performance by decreasing the amount of stray capacitance and noise at the op amp s inputs and output. to decrease stray capacitance, min- imize pc board trace lengths and resistor leads, and place external components close to the op amp s pins. typical application circuit the typical application circuit shows the single max4475 configured as an output buffer for the max5541 16-bit dac. because the max5541 has an unbuffered voltage output, the input bias current of the op amp used must be less than 6na to maintain 16-bit accuracy. the max4475 has an input bias current of only 150pa (max), virtually eliminating this as a source of error. in addition, the max4475 has excellent open- loop gain and common-mode rejection, making this an excellent ouput buffer amplifier. dc-accurate low-pass filter the max4475 max4478/max4488/max4489 offer a unique combination of low noise, wide bandwidth, and high gain, making them an excellent choice for active filters up to 1mhz. the typical operating circuit shows the dual max4477 configured as a 5th order chebyschev filter with a cutoff frequency of 100khz. the circuit is implemented in the sallen-key topology, making this a dc-accurate filter. typical application circuit 0 to +2.5v output shdn 8 4 cs sclk din 2 3 serial interface v dd dgnd ref out agnd +5v +2.5v +5v 7 6 u1 max5541esa u2 max 4475aua typical operating circuit 1 2 3 4 5 6 7 8 470pf 3.09k ? 1% 3.83k ? 1% 13.7k ? 1% 7.87k ? 1% 10.0k ? 1% 10.0k ? 1% 15.0k ? 1% 7.15k ? 1% 10.0k ? 1% 0.1 f 220pf 220pf 220pf 220pf 5v max4477 1/2 max4477 1/2
ordering information (continued) pin configurations max4475?ax4478/max4488/max4489 12 ______________________________________________________________________________________ chip information max4475/max4476 transistor count: 1095 max4477 transistor count: 2132 max4478 transistor count: 4244 max4488 transistor count: 1095 max4489 transistor count: 2132 process: bicmos part temp. range pin- package top mark max4477 aua -40 c to +125 c 8 max MAX4477ASA -40 c to +125 c 8 so max4478 aud -40 c to +125 c 14 tssop max4478asd -40 c to +125 c 14 so max4488 aut-t -40 c to +125 c 6 sot23-6 aazw max4488aua -40 c to +125 c 8 max max4488asa -40 c to +125 c 8 so max4489 aua -40 c to +125 c 8 max max4489asa -40 c to +125 c 8 so sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps out n.c. v ss 1 2 8 7 v dd ina- ina+ n.c. so/ max top view 3 4 6 5 max4475 max4488 shdn inb- outb inb+ v ss 1 2 8 7 v dd ina- ina+ outa so/ max top view 3 4 6 5 max4477 max4489 14 13 12 11 10 9 8 1 2 3 4 5 6 7 outd ind- ind+ v ss v dd ina+ ina- outa top view max4478 inc+ inc- outc outb inb- inb+ so/tssop v ss in- in+ 16 v dd 5 out max4475 max4488 sot23-6 top view 2 34 shdn n.c. v ss in- in+ 16 v dd out max4476 sot23-6 top view 2 34 5
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps package information 8lumaxd.eps ______________________________________________________________________________________ 13
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps package information (continued) 14 _______________________________________________________________________________________ tssop,no pads.eps
max4475?ax4478/max4488/max4489 sot23, low-noise, low-distortion, wide-band, rail-to-rail op amps maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 15 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued) soicn.eps

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