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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 max4074?ax4078 gainamp op amp family combines low-cost rail-to-rail op amps with precision internal gain-setting resistors. factory-trimmed on-chip resistors decrease design 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 just 34?. gainamp amplifiers are optimally compensated for each gain version, achieving gain bandwidth (gbw) products up to 4mhz (a v = +25v/v to +101v/v). high-voltage fault protection withstands ?7v at either input without damage or excessive current draw (max4074/max4075 only). two versions are available in this amplifier family. the MAX4076/max4077/max4078 are single/dual/quad open-loop, unity-gain-stable op amps, and the max4074/max4075 are single/dual fixed-gain op amps. the input common-mode voltage range of the open-loop amplifiers extends from 150mv below the negative supply to within 1.2v of the positive supply. the gainamp outputs can swing rail-to-rail and drive a 1k ? load while maintaining excellent dc accuracy (max4074/max4075 only). the amplifiers are stable for capacitive loads up to 100pf. for space-critical applications, the max4074/MAX4076 are available in space-saving sot23-5 packages. applications portable battery-powered equipment instruments, terminals, and bar-code readers keyless entry photodiode preamps smart-card readers infrared receivers for remote controls low-side current-sense amplifiers features internal gain-setting resistors in sot23 packages (max4074) 0.1% gain accuracy (r f /r g ) (max4074/75) 54 standard gains available (max4074/75) open-loop, unity-gain-stable op amps (MAX4076/77/78) rail-to-rail outputs drive 1k ? load (max4074/75) +2.5v to +5.5v single supply 34? supply current (max4074/75) up to 4mhz gbw product fault-protected inputs withstand ?7v (max4074/75) 200pa max input bias current (MAX4076/77/78) stable with capacitive loads up to 100pf with no isolation resistor max4074?ax4078 ? micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps ________________________________________________________________ maxim integrated products 1 top view max4074 5 4 1 2 3 in- out v cc v ee r g r f in+ sot23-5 19-1526; rev 1; 10/99 pin configurations/ functional diagrams ? patent pending. gainamp is a trademark of maxim integrated products. rail-to-rail is a registered trademark of nippon motorola, ltd. ordering information pin configurations continued at end of data sheet. ordering information continued at end of data sheet. note: insert the desired gain code in the blank to complete the part number (see the gain selector guide). **see the gain selector guide for a list of preferred gains and top marks. 8 so 5 sot23-5 pin- package temp. range -40? to +70? -40? to +70? max4074__esa max4074 _ _euk-t part ** top mark typical operating circuit appears at end of data sheet. gain selector guide appears at end of data sheet.
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics?ax4074/max4075 (v cc = +2.5v to +5.5v, v ee = 0, v in+ = v in- = v cc /2, r l = to v cc /2, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (note 1) 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. supply voltages (v cc to v ee ) ..................................-0.3v to +6v voltage inputs (in_) MAX4076/max4077/max4078 .....(v cc + 0.3v) to (v ee - 0.3v) max4074/max4075..........................................................?7v output short-circuit duration to either supply (out_). . . . continuous continuous power dissipation (t a = +70?) 5-pin sot23 (derate 7.1mw/? above +70?) ............571mw 14-pin tssop (derate 6.3mw/? above +70?) ..........500mw 8-pin ?ax (derate 4.1mw/? above +70?) ..............330mw 8-pin so (derate 5.88mw/? above +70?).................471mw 14-pin so (derate 8.33mw/? above +70?)...............667mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10sec) .............................+300? supply current (per amplifier) i cc 34 50 ? v cc = 3v parameter symbol min typ max units inverting input resistance r in_ 80 k ? v cc - v oh 300 input bias current (note 2) i in+_ 0.8 1000 pa input offset voltage drift 0.3 ?/? noninverting input resistance r in_+ 1000 m ? negative input voltage range in_- ? 5 v power-supply rejection ratio psrr 70 96 db supply voltage range v cc 2.5 5.5 v 300 1000 37 55 input offset voltage v os 0.2 3.5 mv closed-loop output impedance r out 0.2 ? v cc - v oh 5 output short-circuit current -22 ma 0.5 2.5 v ol - v ee output voltage swing (note 4) 100 600 mv r l = 1k ? v cc - v oh 25 150 v ol - v ee positive input voltage range in_+ 11 80 r l = 10k ? v ol - v ee conditions a v +25v/v shorted to v cc a v < +25v/v shorted to v ee v ee -v cc - 0.15 1.2 guaranteed by functional test (note 3) v cc = 2.5v to 5.5v v guaranteed by functional test (note 3) 0.4 2.5 guaranteed by psrr test v cc = 5v r l = 1m ? r l = 1m ?
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps _______________________________________________________________________________________ 3 electrical characteristics?ax4076/max4077/max4078 (v cc = +2.5v to +5.5v, v ee = 0, v in+ = v in- = v cc /2, r l = to v cc /2, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (note 1) electrical characteristics?ax4074/max4075 (continued) (v cc = +2.5v to +5.5v, v ee = 0, v in+ = v in- = v cc /2, r l = to v cc /2, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (note 1) 90 80 90 -3db bandwidth bw (-3db) 120 khz a v = +3v/v a v = +5v/v a v = +10v/v a v = +25v/v 200 a v = +1.25v/v input noise current density 500 fa/ hz capacitive load stability c load 500 pf dc gain accuracy 0.01 1.0 % f = 5khz no sustained oscillations parameter symbol min typ max units power-up time 9 ms slew rate sr 100 v/ms settling time (to 0.01%) 60 ? input voltage noise density e n 150 nv/ hz conditions output settling to 1% v out = 4v step v out = 4v step f = 5khz (note 5) 1.2 t a = +25? (v ee + 25mv) < v out < (v cc - 25mv), r l = 1m ? (note 6) t a = t min to t max supply current (per amplifier) i cc 40 55 ? v cc = 3v parameter symbol min typ max units input bias current (note 2) i ibias 1200 pa input offset voltage drift 1.5? ?/? power-supply rejection ratio psrr 70 95 db supply voltage range v cc 2.5 5.5 v 80 93 45 60 input offset voltage v os 1.2 3.5mv mv closed-loop output impedance r out 0.2 ? 4.5 output short-circuit current 20 ma 80 117 large-signal voltage gain a vol db 0.25v < v out < (v cc - 0.3v), r l = 5k ? 80 95 common-mode input voltage range i vr 0.25v < v out < (v cc - 0.3v), r l = 10k ? conditions a v = +1v/v shorted to v cc shorted to v ee 0.15 v cc - 1.2 v cc = 2.5v to 5.5v v guaranteed by cmrr guaranteed by psrr test v cc = 5v 0.05v < v out < (v cc - 0.1v), r l = 1m ? r l = 1m ? input offset current i os ?.4 pa common-mode rejection ratio cmrr 70 95 db (v cc - 1.2v) v cm -0.15v
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 4 _______________________________________________________________________________________ electrical characteristics?ax4076/max4077/max4078 (continued) (v cc = +2.5v to +5.5v, v ee = 0, v in+ = v in- = v cc /2, r l = to v cc /2, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (note 1) r l = 1m ? 0.22 2.5 conditions v ol - v ee r l = 10k ? 750 v ol - v ee 12 50 v cc - v oh r l = 5k ? mv 100 100 v oh /v ol output voltage swing v ol - v ee 0.23 2.5 v cc - v oh 100 100 v cc - v oh khz gbw gain-bandwidth product units min typ max symbol parameter 230 v out = 4v step v/ms sr slew rate 90 v out = 4v step ? settling time (to 0.01%) 69 f = 5khz nv/ hz e n input voltage noise density 110 f = 5khz fa/ hz input noise current density 1.1 no sustained oscillations, a v = +1v/v pf c load capacitive load stability 100 note 1: all devices are 100% production tested at t a = +25?. 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 gainamps. note 4: for a v = -0.5v/v and a v = -0.25v/v, the output voltage swing may be limited by the input voltage range. note 5: includes noise from on-chip resistors. note 6: the gain accuracy test is performed with the gainamps in the noninverting configuration. the output voltage swing is limit- ed by the input voltage range for certain gains and supply voltage conditions. for situations where the output voltage swing is limited by the valid input range, the output limits are adjusted accordingly. output settling to 1% ms power-up time 10 3 -6 1k 1m 100k 10k small-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 tocc1-2 frequency (hz) gain (db) a v = +2.25v/v a v = +1.25v/v v out = 100mvp-p 3 -6 1k 1m 10k 100k small-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 tocc3-4 frequency (hz) gain (db) a v = +4v/v a v = +2.5v/v v out = 100mvp-p 3 -6 1k 1m 10k 100k small-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 tocc5-6 frequency (hz) gain (db) a v = +9v/v a v = +5v/v v out = 100mvp-p typical operating characteristics (v cc = +5.0v, r l = 100k ? to v cc /2, t a = +25?, unless otherwise noted.) max4074/max4075
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps _______________________________________________________________________________________ 5 3 -6 1k 1m 100k 10k small-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc04 frequency (hz) gain (db) a v = +21v/v a v = +10v/v v out = 100mvp-p 3 -6 1k 1m 100k 10k small-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc05 frequency (hz) gain (db) a v = +25v/v a v = +50v/v v out = 100mvp-p 3 -6 1k 1m 100k 10k small-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc06 frequency (hz) gain (db) a v = +51v/v a v = +101v/v v out = 100mvp-p 3 -6 1k 1m 100k 10k large-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc07 frequency (hz) gain (db) a v = +1.25v/v a v = +2.25v/v v out = 1vp-p 3 -6 1k 1m 100k 10k large-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc08 frequency (hz) gain (db) a v = +2.5v/v a v = +4v/v v out = 1vp-p 3 -6 1k 1m 100k 10k large-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc09 frequency (hz) gain (db) a v = +5v/v a v = +9v/v v out = 1vp-p typical operating characteristics (v cc = +5.0v, r l = 100k ? to v cc /2, t a = +25?, unless otherwise noted.) max4074/max4075 3 -6 1k 1m 100k 10k large-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc10 frequency (hz) gain (db) a v = +10v/v a v = +21v/v v out = 1vp-p 3 -6 1k 1m 100k 10k large-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc11 frequency (hz) gain (db) a v = +25v/v a v = +50v/v v out = 1vp-p 3 -6 1k 1m 100k 10k large-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 max4074-8 toc12 frequency (hz) gain (db) a v = +51v/v a v = +101v/v v out = 1vp-p
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 6 _______________________________________________________________________________________ -10 -100 100 100k 10k 1k total harmonic distortion vs. frequency -70 -90 -30 -50 0 -60 -80 -20 -40 max4074-8 toc25 frequency (hz) thd (db) a v = +1.25v/v a v = +3v/v v out = 1vp-p a v = +10v/v -10 -100 100 100k 10k 1k total harmonic distortion vs. frequency -70 -90 -30 -50 0 -60 -80 -20 -40 max4074-8 toc26 frequency (hz) thd (db) a v = +25v/v a v = +51v/v v out = 1vp-p -90 -70 -80 -50 -60 -30 -40 -20 0 2.0 1.0 3.0 4.0 0.5 2.5 1.5 3.5 4.5 5.0 total harmonic distortion vs. output voltage swing max4074-8 toc27 voltage swing (vp-p) thd (db) a v = +3v/v a v = +10v/v a v = +1.25v/v f = 10khz -90 -70 -80 -50 -60 -30 -40 -20 0 2.0 1.0 3.0 4.0 0.5 2.5 1.5 3.5 4.5 5.0 total harmonic distortion vs. output voltage swing max4074-8 toc28 voltage swing (vp-p) thd (db) a v = +51v/v a v = +25v/v f = 10khz 1000 10 1 1k 10k 100k 10 100 1m 10m voltage noise density vs. frequency 100 max4074-8 toc29 frequency (hz) voltage noise (nv/ hz) a v = +3v/v a v = +1.25v/v a v = +10v/v 1000 10 1 1k 10k 100k 10 100 1m 10m voltage noise density vs. frequency 100 max4074-8 toc30 frequency (hz) a v = +25v/v a v = +51v/v voltage noise (nv/ hz) typical operating characteristics (continued) (v cc = +5.0v, r l = 100k ? to v cc /2, t a = +25?, unless otherwise noted.) max4074/max4075 10 0.1 1 1k 10k 100k 10 100 10m 1m current noise density vs. frequency 1 max4074 toc31 frequency (hz) current noise density (fa/ hz)
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps _______________________________________________________________________________________ 7 10 s/div input output 50mv/div 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 small-signal pulse response max4074 toc36 typical operating characteristics (continued) (v cc = +5.0v, r l = 100k ? to v cc /2, t a = +25?, unless otherwise noted.) 10 s/div input output 500mv/div a v = +1.25v/v output 500mv/div a v = +3v/v output 500mv/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 large-signal pulse response max4074 toc35 max4074/max4075
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 8 _______________________________________________________________________________________ -100 -50 -75 25 0 -25 75 50 100 -50 -5 10 -35 -20 25 40 55 70 85 input offset voltage vs. temperature max4074/5-toc35 temperature (?) input offset voltage ( v) v cc - v ee = 5.5v v cc - v ee = 2.5v -200 0 -100 300 200 100 500 400 600 -45 0 15 -30 -15 30 45 60 75 90 input bias current vs. temperature max4074/5-toc36 temperature ( c) input bias current (pa) v cc - v ee = 5.5v v cc - v ee = 2.5v v cc - v ee = 2.5v v cc - v ee = 5.5v max4074/4075 MAX4076/77/78 -100 -25 -50 -75 0 25 50 75 100 125 150 175 -50 -5 10 -35 -20 25 40 55 70 85 v oh and v ol vs. temperature (v cc - v ee = 2.5v) max4074/5-toc37 temperature ( c) voltage (mv) v oh , r l = 1k ? v oh , r l = 10k ? v ol , r l = 10k ? v ol , r l = 1k ? v oh , r l = 100k ? v ol , r l = 100k ? -150 0 -50 -100 50 100 150 200 250 300 350 400 450 -50 -5 10 -35 -20 25 40 55 70 85 v oh and v ol vs. temperature (v cc - v ee = 5.5v) max4074/5-toc38 temperature ( c) voltage (mv) v oh , r l = 1k ? v oh , r l = 10k ? v ol , r l = 10k ? v ol , r l = 1k ? v oh , r l = 100k ? v ol , r l = 100k ? 30.0 32.5 35.0 37.5 40.0 -50 -5 10 -35 -20 25 40 55 70 85 supply current vs. temperature max4074/5-toc39 temperature ( c) supply current ( a) v cc - v ee = 5.5v v cc - v ee = 2.5v v cc - v ee = 4.0v v cc - v ee = 3.0v typical operating characteristics (continued) (v cc = +5.0v, r l = 100k ? to v cc /2, t a = +25?, unless otherwise noted.) 300 0 1 10 100 output voltage swing vs. r load 50 200 100 150 250 max4074 toc34 r load (k ? ) output swing (mv) v cc - v oh v ol - v ee 100 1k 10k 100k 1m output impedance vs. frequency max4074toc33 frequency (hz) output impedance ( ? ) 1k 0.1 1 10 100 -10 -100 100 100k 10k 1k power-supply rejection vs. frequency -70 -90 -30 -50 0 -60 -80 -20 -40 max4074 toc32 frequency (hz) psr (db)
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps _______________________________________________________________________________________ 9 3 -6 1k 1m 10m 100k 10k small-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 MAX4076/7/8 toc1 frequency (hz) gain (db) 3 -6 1k 1m 10m 100k 10k large-signal gain vs. frequency -3 -5 1 -1 4 -2 -4 2 0 MAX4076- 8 toc2 frequency (hz) gain (db) 1k 10 1 1k 10k 100k 10 100 1m 10m voltage noise vs. frequency 100 MAX4076-8 toc3 frequency (hz) voltage noise (nv/ hz) 10 100 0.1 1 1k 10k 100k 10 100 1m 10m current noise vs. frequency 1 MAX4076-8 toc4 frequency (hz) current noise (pa/ hz) 100 100k 10k 1k total harmonic distortion vs. frequency -70 -90 -50 -60 -80 -40 MAX4076-8 toc5 frequency (hz) thd (db) a v = +1v/v -85 -130 1k 1m 10k 100k max4077 crosstalk vs. frequency -115 -125 -95 -105 -80 -110 -120 -90 -100 MAX4076-8 toc6 frequency (hz) crosstalk (db) -65 -110 1k 1m 10k 100k max4078 all hostile crosstalk vs. frequency -95 -105 -75 -85 -60 -90 -100 -70 -80 MAX4076-8 toc7 frequency (hz) crosstalk (db) three amplifiers driven, one output measured. 120 -200 1 1k 10k 100k 10 100 10m 1m gain and phase vs. frequency -40 -80 -120 -160 0 40 80 270 -450 -90 -180 -270 -360 0 90 180 MAX4076-8 toc8 frequency (hz) gain (db) phase (degrees) phase gain -20 -10 -100 1 1k 10k 100k 10 100 10m 1m common-mode rejection vs. frequency -60 -70 -80 -90 -50 -40 -30 MAX4076-8 toc9 frequency (hz) cmr (db) typical operating characteristics (continued) (v cc = +5.0v, r l = 100k ? to v cc /2, t a = +25?, unless otherwise noted.) MAX4076/max4077/max4078
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 10 ______________________________________________________________________________________ pin description _______________detailed description maxim? 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. there are two versions in this amplifier family: single/dual/quad open-loop, unity-gain-stable devices (MAX4076/max4077/max4078), and single/dual fixed- gain devices (max4074/max4075). all amplifiers fea- ture rail-to-rail outputs and drive a 10k ? load while maintaining excellent dc accuracy. open-loop op amps the single/dual/quad MAX4076/max4077/max4078 are low-power, open-loop op amps with rail-to-rail outputs. these devices are compensated for unity-gain stability and feature a gbw product of 230khz. the common- mode range extends from 150mv below the negative rail to within 1.2v of the positive rail. these high-perfor- mance op amps serve as the core for this family of gainamp fixed-gain amplifiers. although the -3db band- width 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 maxim? proprietary laser trimming techniques allow r f /r g values (figure 1) that produce many different gain configurations. these gainamp fixed-gain ampli- fiers 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 ampli- fiers to plug directly into existing board designs, easily replacing op amps-plus-resistor gain blocks. 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 function positive supply v cc 5 no connection. not internally connected. n.c. inverting amplifier input in_- 4 noninverting amplifier input in_+ 3 negative supply or ground v ee 2 amplifier output out_ 1 7 1, 5, 8 2 3 4 6 8 2, 6 3, 5 4 1, 7 4 2, 6, 9, 13 3, 5, 10, 12 11 1, 7, 8, 14 max4075 max4077 max4078 ?ax/so so/tssop sot23 name so pin max4074/MAX4076
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps ______________________________________________________________________________________ 11 gainamp bandwidth gainamp fixed-gain amplifiers feature factory-trimmed precision 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 decompensated strate- gically over the gain-set options to maximize band- width. open-loop decompensation increases gbw product, ensuring that usable bandwidth is maintained with increasing closed-loop gains. a gainamp with a fixed gain of a v = +25v/v has a -3db bandwidth of 120khz. by comparison, a unity-gain-stable op amp con- figured for a v = +25v/v would yield a -3db bandwidth of only 8khz. decompensation is performed at five inter- mediate gain sets, as shown in the gain selector guide . high-voltage (?7v) input fault protection the max4074/max4075 family includes ?7v input fault protection. for normal operation, see the input voltage range specification in the electrical character- istics . overdriven inputs up to ?7v will not cause out- put phase reversal. a back-to-back scr structure at the input pins allows either input to safely swing ?7v relative to v ee (figure 2). additionally, the internal op amp inputs are diode clamped to both supply rails for the protection of sensitive input stage circuitry. 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 as ?7v causes less than 3.5ma 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, fixed- gain 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 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 max4074/max4075 combine both an op amp and gain-setting feedback resistors on the same ic. the inverting input voltage range is different from the nonin- verting input voltage range because the inverting input pin is connected to the r g input series resistor. just as with a discrete design, take care not to saturate the inputs/output of the core op amp to avoid signal distor- tions or clipping. out in- in+ r g r f 5k note: input stage protection includes two 17v scrs and two diodes at the input stage. v ee max4074 max4075 17v scr v ee v ee v cc 17v scr figure 2. input protection
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 12 ______________________________________________________________________________________ gainamp signal coupling and configurations common op amp configurations include both noninvert- ing and inverting amplifiers. figures 3? show various single- and dual-supply circuit configurations. in single- supply systems, use a resistor-divider to bias the nonin- verting input. a lowpass filter capacitor from the op amp input to ground (figure 5) prevents high-frequency power-supply noise from coupling into the op amp input. dual-supply systems can have ground-referenced sig- nals dc-coupled into the inverting or noninverting inputs. supply bypassing and board layout all devices in this gainamp family operate from a +2.5v to +5.5v single supply or from ?.25v to ?.75v dual supplies. for single-supply operation, bypass the power supply with a 0.1? capacitor to ground. for dual sup- plies, bypass each supply to ground. bypass with capacitors as close to the device as possible to mini- mize 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 in most low-power, rail-to-rail output amplifiers. the fixed- gain amplifiers of this gainamp family are stable with capacitive loads up to 100pf. stability with higher capacitive loads can be improved by adding an isola- tion resistor in series with the op amp output, as shown in figure 7. this resistor improves the circuit? phase margin by isolating the load capacitor from the amplifi- er? output. in figure 8, a 220pf capacitor is driven with a 100 ? isolation resistor exhibiting some overshoot but no oscillation. figures 9 and 10 show the typical small- signal pulse responses of gainamp fixed-gain ampli- fiers with 47pf and 100pf capacitive loads and no isolation resistor max4074 v cc v cc r g r f v in v out = -r f (v in ) r g figure 3. single-supply, dc-coupled inverting amplifier with negative input voltage max4074 v ee v cc r g r f v in v out = - v in ( r f ) r g figure 4. dual-supply, dc-coupled inverting amplifier max4074 v cc v cc r g r f v in 0.1 f v out = v cc - v in ( r f ) 2 r g figure 5. single-supply, ac-coupled inverting amplifier max4074 v ee v cc r g r f v in v out = v in ( 1+ r f ) r g figure 6. dual-supply, dc-coupled noninverting amplifier
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps ______________________________________________________________________________________ 13 max4074 v ee v cc r g r f r iso c l r l output input figure 7. dual-supply, capacitive-load-driving circuit a v = +5v/v 50mv/div input output output a v = +5v/v 500mv/div figure 8. small-signal/large-signal transient response with excessive capacitive load and isolation resistor
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 14 ______________________________________________________________________________________ 10 s/div input output 50mv/div 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 figure 9. gainamp small-signal pulse response (c l = 340pf, r l = 100k ? ) 10 s/div input output 50mv/div 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 figure 10. gainamp small-signal pulse response (c l = 940pf, r l = 100k ? )
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps ______________________________________________________________________________________ 15 gain selector guide note: bold indicates preferred gains. these gain versions are available as samples and in small quantities. 1.25 200 noninverting gain (v/v) adjb ab -3db bw (khz) gain code top mark inverting gain (v/v) 0.25 1.5 136 adjc ac 0.5 2.25 70 adje ae 1.25 2 102 adjd ad 1 3 135 adjg ag 2 4 2.5 90 adji aj 3 3.5 116 180 adjh ah 2.5 adjf af 1.5 6 71 adjk al 5 9 5 50 adjm an 8 7 61 80 adjl am 6 11 79 adjo ba 10 16 10 54 adjq bc 15 13.5 64 90 adjp bb 12.5 adjn ao 9 adjj ak 4 25 120 adjs be 24 21 40 adjr bd 20 31 89 adju bg 30 50 26 50 adjw bj 49 41 67 106 adjv bh 40 adjt bf 25 61 66 adjy bl 60 100 51 40 adka bn 99 80 50 82 adjz bm 79 101 38 adkb ca 100 adjx bk 50
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 16 ______________________________________________________________________________________ pin configurations/functional diagrams top view max4075 8 7 6 5 1 2 3 4 v cc outb inb- inb+ max/so outa ina+ ina- r g r g r f r f v ee - + - + max4074 8 7 6 5 1 2 3 4 v cc out n.c. n.c. so n.c. in+ in- v ee - + MAX4076 8 7 6 5 1 2 3 4 v cc out n.c. n.c. n.c. in+ in- v ee + - sot23-5 MAX4076 5 4 1 2 3 in- out v cc v ee in+ + - max4077 8 7 6 5 1 2 3 4 v cc outb inb- inb+ max/so outa ina+ ina- v ee + + - - so so/tssop max4078 14 13 12 11 1 2 3 4 outd ind- ind+ inc+ outa ina+ ina- v cc 10 9 8 5 6 7 v ee inc- outc inb+ outb inb- - + - + - + - +
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps ______________________________________________________________________________________ 17 ___________________chip information transistor counts max4074: 180 max4077: 340 max4075: 360 max4078: 332 MAX4076: 180 note: insert the desired gain code in the blank to complete the part number (see the gain selector guide). **see the gain selector guide for a list of preferred gains and top marks. ordering information (continued) max4074 input in- in+ +5v out v cc v cc v ee v cc r g 0.1 f r f 0.1 f 0.1 f typical operating circuit max4075_ _esa -40? to +70? 8 so max4075 _ _eua -40? to +70? 8 ?ax max4078esd -40? to +70? 14 so max4078 eud -40? to +70? 14 tssop part MAX4076 euk-t MAX4076esa -40? to +70? -40? to +70? temp. range pin- package 5 sot23-5 8 so max4077 eua max4077esa -40? to +70? -40? to +70? 8 ?ax 8 so top mark **
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps 18 ______________________________________________________________________________________ package information sot5l.eps
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop op amps ______________________________________________________________________________________ 19 package information (continued) tssop.eps
max4074?ax4078 micropower, sot23, rail-to-rail, fixed-gain, gainamp/open-loop 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. 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. package information (continued) 8lumaxd.eps soicn.eps

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