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for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. for small orders, phone 1-800-835-8769. general description the max4174/max4175/max4274/max4275 gain-amp? family combines a low-cost rail-to-rail ? op amp with precision internal gain-setting resistors and v cc / 2 biasing. factory-trimmed on-chip resistors decreasedesign size, cost, and layout, and provide 0.1% gain accuracy. fixed inverting gains from -0.25v/v to -100v/v or noninverting gains from +1.25v/v to +101v/v are available. these devices operate from a single +2.5v to +5.5v supply and consume only 300a. gainamp amplifiers are optimally compensated for each gain version, achieving exceptional gbw prod- ucts up to 23mhz (a v = +25v/v to +101v/v). high-volt- age fault protection withstands 17v at either inputwithout excessive current draw. three versions are available in this amplifier family: single/ dual/quad open-loop, unity-gain stable (max4281/max4282/max4284); single/dual fixed gain (max4174/ max4274); and single/dual fixed gain plus internal v cc / 2 bias at the noninverting input (max4175/ max4275), which simplifies input biasing in single-supplydesigns. the input common-mode voltage range of the open-loop amplifiers extends from 150mv below thenegative supply to within 1.2v of the positive supply. the outputs can swing rail-to-rail and drive a 1k load while maintaining excellent dc accuracy. the amplifieris stable for capacitive loads up to 470pf. applications portable instruments smart-card readers instruments, terminals, infrared receivers for and bar-code readers remote controls keyless entry low-side current-sense photodiode preamps amplifiers features ? gainamp family provides internal precisiongain-setting resistors in sot23 (max4174/5) ? 0.1% gain accuracy (r f /r g ) (max4174/5, max4274/5) ? 54 standard gains available (max4174/5,max4274/5) ? open-loop unity-gain-stable op amps(max4281/2/4) ? rail-to-rail outputs drive 1k load ? internal v cc / 2 biasing (max4175/max4275) ? +2.5v to +5.5v single supply ? 300a supply current ? up to 23mhz gbw product ? fault-protected inputs withstand 17v ? stable with capacitive loads up to 470pf with no isolation resistor max4174/5, max4274/5, max4281/2/4 ? sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps ________________________________________________________________ maxim integrated products 1 19-1407; rev 3; 8/99 part * max4174 _euk-t -40c to +85c temp. range pin- package 5 sot23-5 ordering information continued at end of data sheet. * insert the desired gain code (from the gain selection guide) in the blank to complete the part number. ?? refer to the gain selection guide for a list of preferred gains and sot top marks. ordering information gainamp is a trademark of maxim integrated products. rail-to-rail is a registered trademark of nippon motorola, ltd. ? pg pin configurations typical operating circuit max4175 input in- in+ +5v r b r b out v cc v cc v ee v ee r g 0.1 m f r f 0.1 m f 0.1 m f top view max4174 5 4 1 2 3 in- out v cc v ee r g r f in+ + sot23-5 selector guide appears at end of data sheet. pin configurations continued at end of data sheet. top mark ?? max4175 _euk-t ?? -40c to +85c 5 sot23-5 downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristicsmax4174/max4175/max4274/max4275 fixed-gainamplifiers (v cc = +2.5v to +5.5v, v ee = 0, v in+ = v in- = v cc / 2, r l to v cc / 2, r l = open, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) stresses beyond those listed under absolute maximum ratings may cause permanent damage to the devi ce. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational s ections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage (v cc to v ee ) ....................................-0.3v to +6v voltage inputs (in_) max4281/4282/4284.....................(v ee - 0.3v) to (v cc + 0.3v) max4174/4175/4274/4275 (with respect to gnd) ...........17v output short-circuit duration (out_).....................................continuous to either v ee or v cc continuous power dissipation (t a = +70c) 5-pin sot23 (derate 7.1mw/c above +70c).............571mw 8-pin so (derate 5.88mw/c above +70c).................471mw 8-pin max (derate 4.1mw/c above +70c) ............330mw 14-pin so (derate 8.3mw/c above +70c)...............667mw 16-pin qsop (derate 8.3mw/c above +70c)..........667mw operating temperature range ...........................-40c to +85c maximum junction temperature .....................................+150c storage temperature range .............................-65c to +150c lead temperature (soldering, 10sec) .............................+300c r l = 1k r l = 100k max4174/max4274 shorted to v cc shorted to v ee guaranteed by psrr tests v cc = 2.5v to 5.5v in_+, max4174/max4274 (note 2) max4175/max4275 max4175/max4275,includes v cc / 2 bias resistors max4174/max4274 r l = 100k conditions mv 60 150 output voltage swing(note 4) 150 250 28 28 v oh /v ol ma 65 short-circuit current 10 0.02 r out closed-loop outputimpedance db 70 90 psrr power-supply rejectionratio k 75 noninverting inputresistance m 1000 330 510 300 460 v 2.5 5.5 v cc supply voltage range 150 na 0.05 10 i bias input bias current v/c input offset voltage drift 5 320 480 a 355 530 i cc supply current(per amplifier) 0.5 2.5 units min typ max symbol parameter v cc = 3v v cc = 5v v cc = 3v v cc = 5v mv v os input offset voltage a v < 25v/v k 40 inverting input resistance a v > 25v/v v cc - v oh v ol - v ee v cc - v oh v ol - v ee max4175/max4275, v in + = v in - v v cc / 2 v cc / 2 - 0.25 + 0.25 in_+ bias voltage guaranteed by functional test (note 3) v v ee v cc - 1.2 in_+ input voltage range guaranteed by functional test v v ee v cc in_- input voltage range downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps _______________________________________________________________________________________ 3 electrical characteristicsmax4174/max4175/max4274/max4275 fixed-gainamplifiers (continued) (v cc = +2.5v to +5.5v, v ee = 0, v in+ = v in- = v cc / 2, r l to v cc / 2, r l = open, t a = t min to t max , unless otherwise noted. typical gain = +5v/v gain = +3v/v gain = +1.25v/v no sustained oscillations f = 10khz (note 5) output settling to 1% conditions 970 970 1700 pf 470 c load capacitive load stability nv/ hz 90 e n input noise voltage density ms 1 power-up time units min typ max symbol parameter v cc = 5v, v out = 4v step v/s 0.7 sr slew rate gain = +51v/v gain = +25v/v gain = +10v/v khz 330 bw -3db -3db bandwidth 590 640 f = 10khz fa/ hz 4 i n input noise current density v cc = 5v, v out = 4v step s 7 settling time to within0.01% (v ee + 25mv) < v out < (v cc - 25mv), r l = 100k (note 6) % 0.1 0.5 dc gain accuracy electrical characteristicsmax4281/max4282/max4284 open-loop op amps(v cc = +2.5v to +5.5v, v ee = 0, v in+ = v in- = v cc / 2, r l to v cc / 2, r l = open, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) guaranteed by cmrr test v v ee - 0.15 v cc - 1.2 guaranteed by psrr tests cmvr common-mode inputvoltage range differential or common mode conditions r in input resistance m 1000 v 2.5 5.5 v cc supply voltage range 10 1000 na 0.05 10 i bias input bias current v/c input offset voltage drift 5 units min typ max symbol parameter pa i os input offset current v cc = 3v a 290 450 i cc supply current (per amplifier) r l = 100k w mv 0.5 2 v os input offset voltage v cc = 5v a 320 500 c in input capacitance pf 2.5 v ee - 0.15v v cm v cc - 1.2v db 60 90 cmrr common-mode rejectionratio v cc = 2.5v to 5.5v db 70 90 psrr power-supply rejectionratio a v = 1v/v 0.02 r out closed-loop outputimpedance downloaded from: http:///
typical operating characteristics (v cc = +5v, r l = 100k to v cc / 2, small-signal v out = 100mvp-p, large-signal v out = 1vp-p, t a = +25c, unless otherwise noted.) max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 4 _______________________________________________________________________________________ note 1: max4174/max4175/max4281 and max4274/max4275/max4282 and max4284 are 100% production tested at t a = +25c. all temperature limits are guaranteed by design. note 2: guaranteed by design. note 3: the input common-mode range for in_+ is guaranteed by a functional test. a similar test is done on the in_- input. see the applications information section for more information on the input voltage range of the gainamp. note 4: for a v = -0.5v/v and a v = -0.25v/v, the output voltage swing is limited by the input voltage range. note 5: includes noise from on-chip resistors. note 6: the gain accuracy test is performed with the gainamp in noninverting configuration. the output voltage swing is limited by the input voltage range for certain gains and supply voltage conditions. for situations where the out put voltage swing is lim-ited by the valid input range, the output limits are adjusted accordingly. 4 -6 1k 100k 1m 10k 10m large-signal gain vs. frequency max4174 toc01 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +2.25v/v a v = +1.25v/v 4 -6 1k 100k 1m 10k 10m large-signal gain vs. frequency max4174 toc02 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +4v/v a v = +2.5v/v 4 -6 1k 100k 1m 10k 10m large-signal gain vs. frequency max4174 toc03 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +9v/v a v = +5v/v shorted to v ee mhz 2 no sustained oscillations, a v = 1v/v f = 10khz v cc = 5v, v out = 4v step gbw r l = 100k w v cc = 5v, v out = 4v step s v ee + 0.05v < v out < v cc - 0.1v, r l = 100k w ma gain bandwidth product v/s r l = 1k w 10 conditions 0.7 7 sr slew rate settling time to within 0.01% short-circuit current pf 470 c load capacitive load stability nv/ ? hz 60 e n input noise voltage density shorted to v cc ma 65 v ee + 0.25v < v out < v cc - 0.3v, r l = 1k w 160 250 db 60 100 80 100 28 mv 28 v oh /v ol output voltage swing db a vol large-signal voltage gain 90 120 units min typ max symbol parameter electrical characteristicsmax4281/max4282/max4284 open-loop op amps(continued) (v cc = +2.5v to +5.5v, v ee = 0, v in+ = v in- = v cc / 2, r l to v cc / 2, r l = open, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) v cc - v oh v ol - v ee v cc - v oh v ol - v ee f = 10khz fa/ ? hz 1.8 i n input noise current density output settling to 1% ms 1 power-up time downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps _______________________________________________________________________________________ 5 typical operating characteristics (continued) (v cc = +5v, r l = 100k to v cc / 2, small-signal v out = 100mvp-p, large-signal v out = 1vp-p, t a = +25c, unless otherwise noted.) 4 -6 1k 100k 1m 10k 10m large-signal gain vs. frequency max4174 toc04 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +21v/v a v = +10v/v 4 -6 1k 100k 1m 10k 10m large-signal gain vs. frequency max4174 toc05 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +50v/v a v = +25v/v 4 -6 1k 100k 1m 10k 10m large-signal gain vs. frequency max4174 toc06 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +100v/v a v = +51v/v 4 -6 1k 100k 1m 10k 10m small-signal gain vs. frequency max4174 toc07 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +2.25v/v a v = +1.25v/v 4 -6 1k 100k 1m 10k 10m small-signal gain vs. frequency max4174 toc08 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +4v/v a v = +2.5v/v 4 -6 1k 100k 1m 10k 10m small-signal gain vs. frequency max4174 toc09 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +9v/v a v = +5v/v max4174/max4175 4 -6 1k 100k 1m 10k 10m small-signal gain vs. frequency max4174 toc10 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +21v/v a v = +10v/v 4 -6 1k 100k 1m 10k 10m small-signal gain vs. frequency max4174 toc11 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +50v/v a v = +25v/v 4 -6 1k 100k 1m 10k 10m small-signal gain vs. frequency max4174 toc12 frequency (hz) normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 a v = +100v/v a v = +51v/v downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 6 _______________________________________________________________________________________ 1k 10k 100k 1m total harmonic distortion vs. frequency max4174 toc13 frequency (hz) thd (db) 0 -120 -100 -80 -60 -40 -20 a v = +3v/v a v = +10v/v v out = 1vp-p a v = +1.25v/v 1k 10k 100k 1m total harmonic distortion vs. frequency max4174 toc14 frequency (hz) thd (db) 0 -120 -100 -80 -60 -40 -20 a v = +25v/v a v = +51v/v v out = 1vp-p -120 -90 -100-110 -80 -70 -60 0 2.0 1.5 0.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0 total harmonic distortion vs. output voltage swing max4174 toc15 voltage swing (vp-p) thd (db) a v = +1.25v/v a v = +3v/v a v = +10v/v f = 10khz typical operating characteristics (continued) (v cc = +5v, r l = 100k to v cc / 2, small-signal v out = 100mvp-p, large-signal v out = 1vp-p, t a = +25c, unless otherwise noted.) max4174/max4175 -120 -90 -100-110 -80 -70 -60 0 2.0 1.5 0.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0 total harmonic distortion vs. output voltage swing max4174 toc16 voltage swing (vp-p) thd (db) a v = +25v/v a v = +51v/v f = 10khz 1 10 100 1k 10k 100k voltage noise density vs. frequency (a v = +1.25, +3, +10) max4174/5 toc 17 frequency (hz) 1000 10 100 a v = +10v/v a v = +3v/v a v = +1.25v/v voltage noise density (nv/ ? hz) 1 10 100 1k 10k 100k voltage noise density vs. frequency (a v = +25, +51) max4174/5 toc 18 frequency (hz) 1000 10 100 a v = +25v/v a v = +51v/v voltage noise density (nv/ ? hz) includes resistor noise 1 10 100 1k 10k 100k current noise density vs. frequency max4174/5 toc19 frequency (hz) 10 1 current noise density (fa/ ? hz) downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps _______________________________________________________________________________________ 7 typical operating characteristics (continued) (v cc = +5v, r l = 100k to v cc / 2, small-signal v out = 100mvp-p, large-signal v out = 1vp-p, t a = +25c, unless otherwise noted.) 2 m s/div c l = 0 input voltage a v = +1.25v/v output 500mv/div a v = +3v/v output 50mv/div a v = +5v/v output 500mv/div a v = +10v/v output 500mv/div a v = +25v/v output 500mv/div a v = +51v/v output 500mv/div max4174/5 toc 20 large-signal pulse response 2 m s/div c l = 0 input voltage a v = +1.25v/v output 50mv/div a v = +3v/v output 50mv/div a v = +5v/v output 50mv/div a v = +10v/v output 50mv/div a v = +25v/v output 50mv/div a v = +51v/v output 50mv/div max4174/5 toc 21 small-signal pulse response max4174/max4175 downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 8 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5v, r l = 100k to v cc / 2, small-signal v out = 100mvp-p, large-signal v out = 1vp-p, t a = +25c, unless otherwise noted.) -200 -100-150 50 0 -50 150100 200 -50 -5 10 -35 -20 25 40 55 70 85 input offset voltage vs. temperature max4174/5 toc 25 temperature (?) input offset voltage ( m v) v cc = 2.5v v cc = 5.5v -200 0 200 400 600 800 1000 -45 -15 -30 0 153045607590 input bias current vs. temperature max4174/5 toc 26 temperature (?) input bias current (pa) v cc = 2.5v v cc = 5.5v 240 280260 320300 360340 380 -50 -20 -5 -35 10 25 40 55 70 85 supply current vs. temperature max4174/5 toc 27 temperature (?) supply current ( m a) v cc = 4v v cc = 2.5v v cc = 3v v cc = 5v v cc = 5.5v -100 -60-80 -20-40 20 0 40 8060 100 -50 -20 -5 10 -35 25 40 55 70 85 v oh and v ol vs. temperature (v cc = 2.5v) max4174/5 toc 28 temperature (?) voltage (mv) v ol , r l = 1k w v ol , r l = 10k w v ol , r l = 100k w v oh , r l = 10k w v oh , r l = 100k w v oh , r l = 1k w -100 -60 -40 -20-80 40 60 0 20 80 100 160 180120 140 200 -50 -20 -5 10 -35 25 40 55 70 85 v oh and v ol vs. temperature (v cc = 5.5v) max4174/5 toc 29 temperature (?) voltage (mv) v ol , r l = 1k w v ol , r l = 100k w v ol , r l = 100k w v oh , r l = 10k w v oh , r l = 100k w v oh , r l = 1k w max4174/max4175/max4281/max4282/max4284 -70 100 10k 100k 1k 1m power-supply rejection vs. frequency max4174 toc22 frequency (hz) psr (db) -95 -90 -85 -80 -75 100 10k 100k 1k 1m output impedance vs. frequency max4174 toc23 frequency (hz) output impedance ( w ) 100 0.01 0.1 1 10 5.04.0 1 10 100 output voltage swing vs. r load max4174 toc24 r load (k w ) v swing (vp-p) 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps _______________________________________________________________________________________ 9 1 10k 1m 100 10 1k 100k 10m open-loop gain and phase vs. frequency max4174/5 toc30 frequency (hz) open-loop gain (db) phase (degrees) 140120 100 8060 40 0 -20-40 20 160 -45-90 -135 -180 -225 -270 -315 0 4 -6 -5 1k 10k 100k 1m 10m small-signal gain vs. frequency -4 -3 max4174/5 toc31 frequency (hz) gain (db) -2 -1 0 1 2 3 4 -1-2 -3 -4 -5 -6 1k 10k 100k 1m 10m large-signal gain vs. frequency 0 max4174/5 toc32 frequency (hz) gain (db) 1 2 3 0 -50-60 -70 -80 -90 -100 1k 10k 100k 100 1m 10m common-mode rejection vs. frequency -40 max4174/5 toc33 frequency (hz) cmr (db) -30 -20 -10 0 -60-80 -70-90 -100-110 -10-20 -30 -40 -50 -120 1m 1k 10k 100k total harmonic distortion vs. frequency max4174/5 toc36 frequency (hz) thd (db) a v = 1 v out = 1vp-p 1000 100 10 10 100 1k 1 10k 100k voltage noise density vs. frequency max4174/5 toc34 frequency (hz) voltage noise density (nv/ ? hz) 10 1 10 100 1k 1 10k 100k current noise density vs. frequency max4174/5 toc35 frequency (hz) current noise density (fa/ ? hz) -50-80 -90 -85-95 -55-60 -65 -70 -75 1m 10m 1k 10k 100k max4282 crosstalk vs. frequency max4174/5 toc37 frequency (hz) crosstalk (db) -50-55 -60 -65 -70 -75 1m 10m 1k 10k 100k max4284 crosstalk vs. frequency max4174/5 toc38 frequency (hz) crosstalk (db) three amplifiers driven,one output measured typical operating characteristics (v cc = +5v, r l = 100k to v cc / 2, small-signal v out = 100mvp-p, large-signal v out = 1vp-p, t a = +25c, unless otherwise noted.) max4281/max4282/max4284 downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 10 ______________________________________________________________________________________ out in- in+ v cc v ee r g max4174 out in- in+ v cc v ee max4281 out in- in+ v cc v cc v ee v ee 150k150k r b r b r g r f r f max4175 functional diagrams pin description 16 qsop 14 so/tssop 5 sot23 8 so max4281 8 so/max 8 so/max max4274/ max4275 max4282 5 sot23 function max4174/ max4175 1, 5, 8 no connection. not internally connected. n.c. 8, 9 7 5 positive supply v cc 4 4 8 8 5 2 4 inverting amplifierinput. connects to r g for max4174/ 4175/4274/4275. in-, ina-, inb-, inc-, ind- 2, 6, 11, 15 2, 6, 9, 13 2, 6 3 3 2, 6 4 noninvertingamplifier input. internally biased to v cc / 2 for max4175/max4275 in+, ina+, inb+, inc+, ind+ 3, 5, 12, 14 3, 5, 10, 12 3, 5 3, 5 3 4 2 negative supply orground v ee 13 11 4 6 1 4 2 amplifier output out, outa, outb, outc, outd name 1, 7, 10, 16 1, 7, 8, 14 1, 7 1, 7 1 max4284 name function pin downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps ______________________________________________________________________________________ 11 detailed description maxims gainamp fixed-gain amplifiers combine a low-cost rail-to-rail op amp with internal gain-setting resis- tors. factory-trimmed on-chip resistors provide 0.1% gain accuracy while decreasing design size, cost, and layout. three versions are available in this amplifier family: single/dual/quad open-loop, unity-gain-stable devices (max4281/max4282/max4284); single/dual fixed-gain devices (max4174/max4274); and single/ dual devices with fixed gain plus internal v cc / 2 bias at the noninverting input (max4175/max4275). allamplifiers feature rail-to-rail outputs and drive a 1k load while maintaining excellent dc accuracy. open-loop op amps the single/dual/quad max4281/max4282/max4284are high-performance, open-loop op amps with rail-to- rail outputs. these devices are compensated for unity- gain stability, and feature a gain bandwidth (gbw) of 2mhz. the op amps in these ics feature an input com- mon-mode range that extends from 150mv below the negative rail to within 1.2v of the positive rail. these high performance op amps serve as the core for this family of gainamp fixed-gain amplifiers. although the -3db bandwidth will not correspond to that of a fixed- gain amplifier in higher gain configurations, these open-loop op-amps can be used to prototype designs. internal gain-setting resistors maxims proprietary laser trimming techniques producethe necessary r f /r g values (figure 1), so many gain offerings are easily available. these gainamp fixed-gainamplifiers feature a negative-feedback resistor network that is laser trimmed to provide a gain-setting feedback ratio (r f /r g ) with 0.1% typical accuracy. the standard op amp pinouts allow the gainamp fixed-gain amplifiersto drop in directly to existing board designs, easily replacing op-amp-plus-resistor gain blocks. gainamp bandwidth gainamp fixed-gain amplifiers feature factory-trimmedprecision resistors to provide fixed inverting gains from -0.25v/v to -100v/v or noninverting gains from +1.25v/v to +101v/v. the op-amp core is decompen- sated strategic ally over the gain-set options to maxi- mize bandwidth. open-loop decompensation increasesgbw product, ensuring that usable bandwidth is main- tained with increasing closed-loop gains. a gainamp with a fixed gain of a v = 100v/v has a -3db bandwidth of 230khz. by comparison, a unity-gain-stable op ampconfigured for a v = 100v/v would yield a -3db band- width of only 20khz (figure 2). decompensation is per-formed at five intermediate gain sets, as shown in the gain selection guide . low gain decompensation great- ly increases usable bandwidth, while decompensationabove gains of +25v/v offers diminished returns. v cc / 2 internal bias the max4175/max4275 gainamp fixed-gain amplifierswith the v cc / 2 bias option are identical to standard gainamp fixed-gain amplifiers, with the added featureof v cc / 2 internal bias at the noninverting inputs. two 150k resistors form a voltage-divider for self-biasing the noninverting input, eliminating external bias resis-tors for ac-coupled applications, and allowing maxi- mum signal swing at the op amps rail-to-rail output for single-supply systems (see typical operating circuit ). for dc-coupled applications, use the max4174/max4274. high-voltage (?7v) input fault protection the max4174/max4175/max4274/max4275 include17v input fault protection. for normal operation, see the input voltage range specification in the electrical characteristics . overdriven inputs up to 17v will not out a v = -r f r g r g r f in- in+ v cc v ee a v = 1 + r f r g figure 1. internal gain-setting resistors frequency (hz) gain (db) 60 0 10 20 30 40 -3db 50 10 10k 100k 1m 10m 100 1k 20khz 230khz max4281, a v = 100 2mhz gbw max4174, a v = 100 23mhz gbw figure 2. gain-bandwidth comparison downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 12 ______________________________________________________________________________________ cause output phase reversal. a back-to-back scrstructure at the input pins allows either input to safely swing 17v relative to v ee (figure 3). additionally, the internal op-amp inputs are diode clamped to eithersupply rail for the protection of sensitive input stage cir- cuitry. current through the clamp diodes is limited by a 5k resistor at the noninverting input, and by r g at the inverting input. an in+ or in- fault voltage as high as17v will cause less than 3.5ma of current to flow through the input pin, protecting both the gainamp and the signal source from damage. applications information gainamp fixed-gain amplifiers offer a precision, fixedgain amplifier in a small package that can be used in a variety of circuit board designs. gainamp fixed-gain amplifiers can be used in many op amp circuits that use resistive negative feedback to set gain, and that do not require other connections to the op-amp inverting input. both inverting and noninverting op-amp configurations can be implemented easily using a gainamp. gainamp input voltage range the max4174/max4175/max4274/max4275 combineboth an op amp and gain-setting feedback resistors on the same chip. because the inverting input pin is actu- ally tied to the r g input series resistor, the inverting input voltage range is different from the noninvertinginput voltage range. just as with a discrete design, care must be taken not to saturate the inputs/output of the core op amp, to avoid signal distortions or clipping. the inverting inputs (in_-) of the max4174/max4175/ max4274/max4275 must be within the supply rails or signal distortion may result. the gainamps inverting input structure includes diodes to both supplies, such that driving the inverting input beyond the rails may cause signal distortions (figure 1). for applications that require sensing voltages beyond the rails, use the max4281/max4282/max4284 open-loop op amps (figure 4). out in- in+ r g r f 5k v ee v ee bias resistors (max4175/max4275 only) note: input stage protection includes two 17v scrs and two diodes at the input stage. v cc v cc v ee max4174 max4175 max4274 max4275 17v scr v ee 17v scr figure 3. input protection downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps ______________________________________________________________________________________ 13 gainamp signal coupling and configurations common op-amp configurations include both nonin-verting and inverting amplifiers. figures 5C8 show vari- ous single and dual-supply circuit configurations. single-supply systems benefit from a midsupply bias on the noninverting input (provided internally on max4175/max4275), as this produces a quiescent dc level at the center of the rail-to-rail output stage signal swing. for dual-supply systems, ground-referenced signals may be dc-coupled into the inverting or non- inverting inputs. in_+ filter on max4175/max4275 internal resistor biasing of the v cc / 2 bias options cou- ples power-supply noise directly to the op amps nonin-verting input. to minimize high-frequency power-supply noise coupling, add a 1f to 0.1f capacitor from in+ to ground to create a lowpass filter (figure 6). the low- pass filter resulting from the internal bias resistors and added capacitor can help eliminate higher frequency power-supply noise coupling through the noninverting input. max4281 v cc v cc r g r f v in v out = -r f (v in ) r g figure 4. single-supply, dc-coupled inverting amplifier with negative input voltage max4175 v cc r g r b r b r f v in 0.1 m f v out = v cc - v in ( r f ) 2 r g figure 6. single-supply, ac-coupled inverting amplifier max4174 v ee v cc r g r f v in v out = - v in ( r f ) r g figure 5. dual-supply, dc-coupled inverting amplifier max4174 v ee v cc r g r f v in v out = v in ( 1+ r f ) r g figure 7. dual-supply, ac-coupled noninverting amplifier downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 14 ______________________________________________________________________________________ max4174 v ee v cc r g r f r iso c l r l output input figure 9. dual-supply, capacitive-load driving circuit figure 10. small-signal/large-signal transient response with excessive capacitive load with isolation resistor a v = +5v/v 50mv/div inputoutput output a v = +5v/v 500mv/div supply bypassing and board layout all devices in the gainamp family operate from a +2.5vto +5.5v single supply or from 1.25v to 2.75v dual supplies. for single-supply operation, bypass the power supply with a 0.1f capacitor to ground. for dual supplies, bypass each supply to ground. bypass with capacitors as close to the device as possible, to min- imize lead inductance and noise. a printed circuit board with a low-inductance ground plane is recommended. capacitive-load stability driving large capacitive loads can cause instability inmost low-power, rail-to-rail output amplifiers. the fixed- gain amplifiers of this gainamp family are stable withcapacitive loads up to 470pf. stability with higher capacitive loads can be improved by adding an isolation resistor in series with the op-amp output, as shown in figure 9. this resistor improves the circuits phase mar- gin by isolating the load capacitor from the amplifiers output. in figure 10, a 1000pf capacitor is driven with a 100 isolation resistor exhibiting some overshoot but no oscillation. figures 11 and 12 show the typical small-sig-nal pulse responses of gainamp fixed-gain amplifiers with 250pf and 470pf capacitive loads and no isolation resistor. max4174 v ee v cc r g r f v in v out = v in ( 1+ r f ) r g figure 8. dual-supply, dc-coupled noninverting amplifier downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps ______________________________________________________________________________________ 15 2 m s/div input a v = +1.25v/v output 50mv/div a v = +3v/v output 50mv/div a v = +5v/v output 50mv/div a v = +10v/v output 50mv/div a v = +25v/v output 50mv/div a v = +51v/v output 50mv/div figure 11. max4174/max4175 small-signal pulse response (c l = 250pf, r l = 100k ) figure 12. max4174/max4175 small-signal pulse response (c l = 470pf, r l = 100k ) 2 m s/div input a v = +1.25v/v output 50mv/div a v = +3v/v output 50mv/div a v = +5v/v output 50mv/div a v = +10v/v output 50mv/div a v = +25v/v output 50mv/div a v = +51v/v output 50mv/div downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 16 ______________________________________________________________________________________ gain selection guide r f /r g inverting gain 1+ (r f /r g ) noninverting gain ab* 0.25 1.25 -3db bw (khz) ? 1700 gain code acds ac 0.5 1.5 1280 acdt ad* 1 2 590 acdu ae 1.25 2.25 450 acdv top mark acet aceu acev acew af 1.5 2.5 1180 acdw acex ag* 2 3 970 acdx acey ah 2.5 3.5 820 acdy acez aj 3 4 690 acdz acfa ak* 4 5 970 acea acfb al 5 6 790 aceb acfc am 6 7 640 acec acfd an 8 9 480 aced acfe ao* 9 10 640 acee acff ba* 10 11 560 acef acfg bb 12.5 13.5 460 aceg acfh bc 15 16 390 aceh acfi bd 20 21 300 acei acfj be* 24 25 590 acej acfk bf 25 26 580 acek acfl bg 30 31 510 acel acfm bh 40 41 390 acem acfn bj* 49 50 310 acen acfo bk* 50 51 330 aceo acfp bl 60 61 310 acep acfq bm 80 81 260 aceq acfr bn* 99 100 230 acer acfs ca* 100 101 230 aces acft note: gains in the noninverting configuration are 1+ (r f /r g ) and range from +1.25v/v to +101v/v. for a +1v/v gain, use the max4281/max4282/max4284. * preferred gains. these gain versions are available as samples and in small quantities. ? the -3db bandwidth is the same for inverting and noninverting configurations. max4174 max4175 downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps ______________________________________________________________________________________ 17 pin configurations (continued) top view sot23-5 max4275 87 6 5 1 2 3 4 v cc outbinb- inb+ m max/so outa ina+ ina- v cc v cc r r r r r g r g r f r f v ee max4175 5 4 1 2 3 out v cc v cc v ee r r r g r f in+ sot23-5 max4281 5 4 1 2 3 in- out v cc v ee in+ max4274 87 6 5 1 2 3 4 v cc outbinb- inb+ m max/so outa ina+ ina- r g r g r f r f v ee max4282 87 6 5 1 2 3 4 v cc outbinb- inb+ m max/so so/tssop qsop outa ina+ ina- v ee max4284 1615 14 13 1 2 3 4 outdind- ind+ inc+ outa ina+ ina- v cc 1211 10 9 5 6 7 8 v ee inc-outc n.c. inb+ outb inb- n.c. max4284 1413 12 11 1 2 3 4 outdind- ind+ inc+ outa ina+ ina- v cc 109 8 5 6 7 v ee inc-outc inb+ outb inb- max4281 87 6 5 1 2 3 4 v cc outn.c. n.c. so n.c. in+ in- v ee - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps 18 ______________________________________________________________________________________ ordering information (continued) transistor counts: max4174: 178max4175: 178 max4274: 332 max4275: 332 max4281: 178 max4282: 332 max4284: 328 substrate connected to v ee selector guide note: refer to gain selection guide for sot top marks. * insert the desired gain code (from the gain selection guide) in the blank to complete the part number. refer to gain selection guide for a list of preferred gains. chip information inverting gains available (v/v) (inverting, r f /r g ) noninverting gain (v/v) max4174_ -0.25 to -100 +1.25 to +101 internal resistors yes internal v cc /2 bias part * no no. of amps per package 1 pin-package 5-pin sot23 max4175_ -0.25 to -100 +1.25 to +101 yes yes 1 5-pin sot23 max4274_ -0.25 to -100 +1.25 to +101 yes no 2 8-pin max/so max4275_ -0.25 to -100 +1.25 to +101 yes yes 2 8-pin max/so max4281_ open loop, unity-gain stable no no 1 5-pin sot23,8-pin so max4282_ open loop, unity-gain stable no no 2 8-pin max/so max4284_ open loop, unity-gain stable no no 4 14-pin so/tssop, 16-pin qsop part * max4281 euk-t -40c to +85c max4274 _eua -40c to +85c 5 sot23-5 max4281esa temp. range pin- package -40c to +85c 8 so 8 max max4274_esa max4284 eud -40c to +85c max4282 eua -40c to +85c -40c to +85c 8 so 14 tssop max4284eee -40c to +85c 16 qsop 8 max max4282esa -40c to +85c 8 so max4275 _eua -40c to +85c 8 max max4275_esa -40c to +85c 8 so acdr top mark * insert the desired gain code (from the gain selection guide) in the blank to complete the part number. max4284esd -40c to +85c 14 so downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps ______________________________________________________________________________________ 19 sot5l.eps package information downloaded from: http:///
max4174/5, max4274/5, max4281/2/4 sot23, rail-to-rail, fixed-gain gainamps/open-loop op amps maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied i n 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. 20 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 1999 maxim integrated products printed usa is a registered trademark of maxim integrated products. 8lumaxd.eps package information downloaded from: http:///

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