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general description the max4165?ax4169 family of operational ampli- fiers combines excellent dc accuracy with high output current drive, single-supply operation, and rail-to-rail inputs and outputs. these devices operate from a sin- gle +2.7v to +6.5v supply, or from dual ?.35v to ?.25v supplies. they typically draw 1.2ma supply current, and are guaranteed to deliver 80ma output current. the max4166/max4168 have a shutdown mode that reduces supply current to 38? per amplifier and places the outputs into a high-impedance state. the max4165?ax4169? precision performance com- bined with high output current, wide input/output dynamic range, single-supply operation, and low power consumption makes them ideal for portable audio applications and other low-voltage, battery-powered systems. the max4165 is available in the space-saving 5-pin sot23 package. ________________________applications portable/battery-powered audio applications portable head-phone speaker drivers laptop/notebook computers sound ports/cards set-top boxes cell phones hands-free car phones (kits) signal conditioning digital-to-analog converter buffers transformer/line drivers motor drivers ____________________________features ? 80ma (min) output drive capability ? rail-to-rail input common-mode voltage range ? rail-to-rail output voltage swing ? 1.2ma supply current per amplifier ? +2.7v to +6.5v single-supply operation ? 5mhz gain-bandwidth product ? 250? offset voltage ? 120db voltage gain (r l = 100k ) ? 88db power-supply rejection ratio ? no phase reversal for overdriven inputs ? unity-gain stable for capacitive loads to 250pf ? low-power shutdown mode: reduces supply current to 38? places outputs in high-impedance state ? available in 5-pin sot23 package (max4165) max4165?ax4169 high-output-drive, precision, low-power, single- supply, rail-to-rail i/o op amps with shutdown ________________________________________________________________ maxim integrated products 1 v ee in- in+ 1 5 v cc out max4165 sot23-5 top view 2 3 4 pin configurations selector guide 19-1224; rev 1; 10/97 part max4165 euk-t max4166 epa MAX4166ESA -40? to +85? -40? to +85? -40? to +85? temp. range pin- package 5 sot23-5 8 plastic dip 8 so ordering information ordering information continued at end of data sheet. typical operating circuit appears at end of data sheet. rail-to-rail is a registered trademark of nippon motorola ltd. pin configurations continued at end of data sheet. for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 for small orders, phone 408-737-7600 ext. 3468. amps per package max4165 single max4166 single part max4167 dual max4168 dual shutdown mode yes yes max4169 quad max4166eua -40? to +85? 8 ?ax sot top mark aaby
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown 2 _______________________________________________________________________________________ absolute maximum ratings 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 voltage (v cc to v ee ) .................................................... 7v in_+, in_-, shdn_ ............................ (v ee - 0.3v) + (v cc + 0.3v) out_ (shutdown mode) ................... (v ee - 0.3v) + (v cc + 0.3v) output short-circuit duration to v cc or v ee (note 1) .... continuous continuous power dissipation (t a = +70 c) 5-pin sot23 (derate 7.10mw/ c above +70 c) ........... 571mw 8-pin plastic dip (derate 9.09mw/ c above +70 c) .... 727mw 8-pin so (derate 5.88mw/ c above +70 c) ................. 471mw 8-pin max (derate 4.10mw/ c above +70 c) ............ 330mw 10-pin max (derate 5.60mw/ c above +70 c) .......... 444mw 14-pin plastic dip (derate 10.00mw/ c above +70 c) ... 800mw 14-pin so (derate 8.33mw/ c above +70 c) ............... 667mw operating temperature range ........................... -40 c to +85 c junction temperature ...................................................... +150 c storage temperature range ............................. -65 c to +150 c lead temperature (soldering, 10sec) ............................. +300 c dc electrical characteristics (v cc = +2.7v to +6.5v, v ee = 0v, v cm = 0v, v out = (v cc / 2), r l = 100k to (v cc / 2), v s hdn 3 2v, t a = +25 c, unless otherwise noted.) | v in + - v in - | > 1.8v | v in + - v in - | 1.8v v cm = v ee to v cc inferred from cmrr test conditions 2 r in(diff) differential input resistance k 500 na 1 15 i os input offset current v v ee - 0.25 v cc + 0.25 v cm common-mode input voltage range v s hdn < 0.8v, v out = 0v to v cc a vcl = +1v/v v out = 0.2v to 4.8v, r l = 100k a 0.001 2 i out( shdn ) off-leakage current in shutdown 0.1 r out output resistance 72 93 72 93 max416_epa/epd max416_esa/esd 0.35 1.5 0.25 0.85 v cc = 5v a vol large-signal voltage gain 95 120 units min typ max symbol parameter max416_epa/epd 0.25 0.85 max416_esa/esd v cm = v ee to v cc mv 0.35 1.7 v os input offset voltage max416_eua/eub 0.25 1.0 max416_euk max416_eua/eub 72 86 72 88 63 90 62 89 max416_euk max416_esa/esd 72 86 max416_eua/eub 70 88 max416_euk max4169e_d v cc = 2.7v to 6.5v psrr power-supply rejection ratio db v out = 0.6v to 4.4v, r l = 25 71 83 db note 1: continuous power dissipation should also be observed. 71 93 db v ee - 0.25v < v cm < (v cc + 0.25v) cmrr common-mode rejection ratio 72 88 max416_epa/epd v cm = v ee to v cc na 50 150 i b input bias current max4169e_d max4169e_d
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown _______________________________________________________________________________________ 3 dc electrical characteristics (continued) (v cc = +2.7v to +6.5v, v ee = 0v, v cm = 0v, v out = (v cc / 2), r l = 100k to (v cc / 2), v s hdn 3 2v, t a = +25 c, unless otherwise noted.) dc electrical characteristics (v cc = +2.7v to +6.5v, v ee = 0v, v cm = 0v, v out = (v cc / 2), r l = 100k to (v cc / 2), v s hdn 3 2v, t a = -40 c to +85 c, unless otherwise noted.) (note 4) v cc = 3v v cc = 5v shutdown mode v cc = 5v v cc = 3v v ih conditions 0.8 v s hdn < 0.8v inferred from psrr test v ee < v s hdn < v cc normal mode a 38 49 v 2.7 6.5 v cc operating supply-voltage range a 3.0 shdn input bias current v 2.0 v il shdn logic threshold (note 3) i cc( shdn ) shutdown supply current (per amplifier) 58 75 ma 1.2 1.4 15 30 i cc quiescent supply current (per amplifier) 1.3 1.5 units min typ max symbol parameter 10 25 v cc = 5v mv 160 350 v out output voltage swing 340 430 v out = 0.6v to (v cc - 0.6v) ma 80 125 output source/sink current (note 2) v cc - v oh r l = 100k v ol - v ee v cc - v oh v ol - v ee r l = 25 v cm = v ee to v cc inferred from cmrr test v cm = v ee to v cc na 225 i b input bias current conditions na 21 i os input offset current v v ee - 0.15 v cc + 0.15 v cm common-mode input voltage range 71 71 max416_epa/epd max416_esa/esd 4.3 1.0 units min typ max symbol parameter max416_epa/epd 1.0 max416_esa/esd v cm = v ee to v cc mv 4.9 v os input offset voltage max416_eua/eub 1.2 max416_euk max416_eua/eub 65 67 57 56 max416_euk max416_esa/esd 65 max416_eua/eub 66 max416_euk max4169e_d v cc = 2.7v to 6.5v psrr power-supply rejection ratio db v/ c 3 ? v os / ? t offset-voltage tempco max4169e_d v ee - 0.15v < v cm < (v cc + 0.15v) 69 max4169e_d db cmrr common-mode rejection ratio 67 max416_epa/epd
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown 4 _______________________________________________________________________________________ dc electrical characteristics (continued) (v cc = +2.7v to +6.5v, v ee = 0v, v cm = 0v, v out = (v cc / 2), r l = 100k to (v cc / 2), v s hdn 3 2v, t a = -40 c to +85 c, unless otherwise noted.) ac electrical characteristics (v cc = +2.7v to +6.5v, v ee = 0v, v cm = 0v, v out = (v cc / 2), r l = 2.5k to (v cc / 2), v s hdn 3 2v, c l = 15pf, t a = +25 c, unless otherwise noted.) v cc = 3v v cc = 5v v cc = 3v inferred from psrr test i out( shdn ) conditions v s hdn < 0.8v v ee < v s hdn < v cc v s hdn < 0.8v, v out = 0v to v cc v cc = 5v a 54 v 2.7 6.5 v cc operating supply-voltage range a 3.5 shdn input bias current a 5 off-leakage current in shutdown i cc( shdn ) shutdown supply current (per amplifier) 82 ma 1.6 i cc quiescent supply current (per amplifier) 1.7 units min typ max symbol parameter slew rate sr v/ s gain margin gm db degrees 21 pm phase margin 68 settling time to 0.01% t s conditions a vcl = +1v/v, 2v step s pf c in input capacitance 3 f = 10khz, v out = 2vp-p, a vcl = +1v/v % 2.1 thd total harmonic distortion channel-to-channel isolation 0.005 capacitive load stability v out = 4vp-p, v cc = 5v f = 1khz, r l = 100k (max4167?ax4169) f = 1khz mhz 5 gbwp gain-bandwidth product nv/ hz e n input voltage noise density 26 db f = 1khz pa/ hz 125 i n input current noise density 0.4 a vcl = +1v/v, no sustained oscillations pf 250 khz 2 shutdown time enable time from shutdown t s hdn s 1 t enable fpbw full-power bandwidth s 1 260 power-up time t on s 5 units min typ max symbol parameter v out = 0.6v to (v cc - 0.6v) ma 80 output source/sink current (note 2) v cc = 5v 90 a vol db 66 large-signal voltage gain v out = 0.2v to 4.8v, r l = 100k v out = 0.6v to 4.4v, r l = 25 r l = 100k 40 30 output voltage swing v cc = 5v 490 r l = 25 v out mv 400 v cc - v oh v ol - v ee v cc - v oh v ol - v ee shutdown mode v ih 0.8 normal mode v 2.0 v il shdn logic threshold (note 3) note 2: although the minimum output current is guaranteed to be 80ma, exercise caution to ensure that the absolute maximum power-dissipation rating of the package is not exceeded. note 3: shdn logic thresholds are referenced to v ee . note 4: the max4165euk is 100% tested at +25 c. all temperature limits are guaranteed by design.
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown _______________________________________________________________________________________ 5 70 - 30 100 1k 10k 100k 1m 10m gain and phase vs. frequency 10 0 - 10 -20 max4165-01 frequency (hz) gain (db) 30 20 50 40 60 216 -144 0 -36 -72 -108 72 36 144 108 180 phase (degrees) a vcl = +1000v/v 70 -30 100 1k 10k 100k 1m 10m gain and phase vs. frequency (c l = 250pf) -20 max4165-02 frequency (hz) gain (db) 10 0 -10 50 40 30 20 60 216 -144 -108 0 -36 -72 144 108 72 36 180 phase (degrees) a vcl = +1000v/v c l = 250pf 10 -90 100 1k 10k 100k 1m 10m 100m power-supply rejection ratio vs. frequency -70 -80 max4165-03a frequency (hz) psrr (db) -50 -60 -30 -40 -10 -20 0 a vcl = +1 1000 0.1 1 10 100 1k 10k 100k 1m 10m output impedance vs. frequency 1 max4165-03b frequency (hz) output impedance ( w ) 10 100 80 -60 0 7 input bias current vs. common-mode voltage -40 60 max4165-06 common-mode voltage (v) input bias current (na) 1 2 3 4 5 6 40 20 0 -20 v cc = +6.5v v cc = +2.7v 1.6 0 -40 100 supply current per amplifier vs. temperature 0.2 1.4 max4165-04 temperature (?) supply current (ma) -20 0 20 40 60 80 1.2 1.0 0.8 0.6 0.4 v cc = +6.5v v cc = +2.7v 80 0 -40 100 shutdown supply current per amplifier vs. temperature 20 10 70 60 max4165-05 temperature (?) supply current ( m a) -20 0 20 40 60 80 50 40 30 v cc = +6.5v v cc = +2.7v 80 -60 -40 100 input bias current vs. temperature -40 60 max4165-07 temperature (?) input bias current (na) -20 0 20 40 60 80 40 20 0 -20 v cc = +6.5v, v cm = v cc v cc = +2.7v, v cm = v cc v cc = +2.7v, v cm = v ee v cc = +6.5v, v cm = v ee 2.25 -2.25 -40 80 input offset voltage vs. temperature -1.75 1.75 1.25 max4165-08 temperature (?) voltage (mv) -20 0 20 40 60 0.75 0.25 -0.75 -0.25 -1.25 sot23-5 package so package __________________________________________ t ypical operating characteristics (v cc = +5.0v, v ee = 0v, r l = 100k , t a = +25 c, unless otherwise noted.)
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown 6 _______________________________________________________________________________________ ____________________________ t ypical operating characteristics (continued) (v cc = +5.0v, v ee = 0v, r l = 100k , t a = +25 c, unless otherwise noted.) 2.00 1.75 -40 100 minimum operating voltage vs. temperature 1.80 1.95 max4165-09 temperature (?) minimum operating voltage (v) -20 0 20 40 60 80 1.90 1.85 88.0 84.0 84.5 -40 100 common-mode rejection ratio vs. temperature 85.5 85.0 87.5 87.0 max4165-10 temperature (?) cmrr (db) -20 0 20 40 60 80 86.5 86.0 140 0 20 0 0.6 large-signal gain vs. output voltage (sinking, v cc = 6.5v) 60 40 120 max4165-11 output voltage (v) large-signal gain (db) 0.1 0.2 0.3 0.4 0.5 100 80 r l = 100k w r l = 1k w r l = 100 w v cc = +6.5v r l to v cc 125 90 95 0 0.6 large-signal gain vs. output voltage (sourcing, v cc = 6.5v) 105 100 120 max4165-12 output voltage (v) large-signal gain (db) 0.1 0.2 0.3 0.4 0.5 115 110 r l = 100k w r l = 1k w r l = 100 w v cc = +6.5v r l to v ee 125 107 109 -40 100 large-signal gain vs. temperature (r l = 100k w ) 111 123 max4165-15a temperature (?) large-signal gain (db) -20 0 20 40 60 80 121 119 117 115 113 v cc = +6.5v r l to v cc or v ee v cc = +2.7v r l to v cc or v ee v outp-p = v cc - 1v r l = 100k w 110 60 65 -40 100 large-signal gain vs. temperature (r l = 100 w ) 75 70 105 max4165-15 temperature (?) large-signal gain (db) -20 0 20 40 60 80 100 95 90 85 80 v cc = +2.7v r l to v ee v cc = +2.7v r l to v cc v cc = +6.5v r l to v cc v outp-p = v cc - 1v r l = 100 w v cc = +6.5v r l to v ee 120 0 20 0 0.40 large-signal gain vs. output voltage (sinking, v cc = 2.7v) 40 100 max4165-13 output voltage (v) large-signal gain (db) 0.05 0.10 0.15 0.20 0.25 0.30 0.35 80 60 r l = 100k w r l = 100 w r l = 1k w v cc = +2.7v r l to v cc 120 0 0 0.40 large-signal gain vs. output voltage (sourcing, v cc = 2.7v) 40 20 100 max4165-14 output voltage (v) large-signal gain (db) 0.05 0.15 0.10 0.20 0.25 0.30 0.36 80 60 v cc = +2.7v r l to v ee r l = 100k w r l = 100 w r l = 1k w 120 0 20 -40 100 output voltage low vs. temperature 40 100 max4165-16 temperature (?) v out - v ee (mv) -20 0 20 40 60 80 80 60 v cc = +6.5v, r l = 100 w r l to v cc v cc = +2.7v, r l = 100 w v cc = +6.5v, r l = 100k w v cc = +2.7v, r l = 100k w
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown _______________________________________________________________________________________ 7 0.05 0 10 1k 100 10k 100k total harmonic distortion and noise vs. frequency 0.01 max4165-18 frequency (hz) thd + noise (%) 0.02 0.03 0.04 v out = 2vp-p 500khz lowpass filter r l = 10k w to v cc / 2 1 0.001 4.0 4.6 4.8 5.0 total harmonic distortion and noise vs. peak-to-peak output voltage 0.01 0.1 max4165-19 peak-to-peak output (v) thd + noise (%) 4.2 4.4 r l = 250 w r l = 2k w r l = 100k w r l = 25 w f = 10khz r l to v cc / 2 in (50mv/div) out (50mv/div) small-signal transient response (noninverting) max4165-20 time (500ns/div) a vcl = +1v/v 130 80 1k 100k 1m 10k 10m channel-to-channel isolation vs. frequency 90 85 max4165-19a frequency (hz) channel-to-channel isolation (db) 100 95 110 105 120 125 115 in (50mv/div) out (50mv/div) small-signal transient response (inverting) max4165-21 time (500ns/div) a vcl = -1v/v in (2v/div) out (2v/div) large-signal transient response (noninverting) max4165-22 time (5 m s/div) a vcl = +1v/v in (2v/div) out (2v/div) large-signal transient response (inverting) max4165-23 time (5 m s/div) a vcl = -1v/v 300 0 50 -40 100 output voltage high vs. temperature 250 max4165-17 temperature (?) output voltage high (mv) -20 0 20 40 60 80 200 150 100 v cc = +6.5v, r l = 100 w v cc = +2.7v, r l = 100 w v cc = +6.5v or + 2.7v, r l = 100k w r l to v ee ____________________________ t ypical operating characteristics (continued) (v cc = +5.0v, v ee = 0v, r l = 100k , t a = +25 c, unless otherwise noted.)
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown 8 _______________________________________________________________________________________ pin description no connection. not internally connected. 1, 5 negative supply. ground for single- supply operation. 4 2 outputs for amplifiers 1 and 2 inverting inputs for amplifiers 1 and 2 noninverting inputs for amplifiers 1 and 2 inverting input 2 4 noninverting input 3 3 active-low shutdown inputs for amplifiers 1 and 2. drive low for shut - down mode. drive high or connect to v cc for normal operation. positive supply 7 5 outputs for amplifiers 3 and 4 noninverting inputs for amplifiers 3 and 4 pin inverting inputs for amplifiers 3 and 4 output 6 1 max4168 max4165 active-low shutdown input. drive low for shutdown mode. drive high or con - nect to v cc for normal operation. 8 4 1, 7 2, 6 3, 5 8 function 5, 7, 8, 10 4 1, 13 2, 12 3, 11 6, 9 14 max4166 4 1, 9 2, 8 3, 7 5, 6 10 max4167 11 1, 7 2, 6 3, 5 4 8, 14 10, 12 9, 13 n.c. v ee out1, out2 in1-, in2- in1+, in2+ in- in+ shdn1 , shdn2 v cc out3, out4 in3+, in4+ in3-, in4- out dip/so shdn max max4169 name
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown _______________________________________________________________________________________ 9 applications infor mation package power dissipation warning: due to the high output current drive, this op amp can exceed the absolute maximum power-dissi - pation rating. as a general rule, as long as the peak cur - rent is less than or equal to 80ma, the maximum package power dissipation will not be exceeded for any of the package types offered. there are some exceptions to this rule, however. the absolute maximum power-dissipation rating of each package should always be verified using the following equations. the following equation gives an approximation of the package power dissipation: where: v rms = the rms voltage from v cc to v out when sourcing current = the rms voltage from v out to v ee when sinking current i rms = the rms current flowing out of or into the op amp and the load q = the phase difference between the voltage and the current. for resistive loads, cos q = 1. for example, the circuit in figure 1 has a package power dissipation of 157mw. therefore, p ic(diss) = v rms i rms cos q = 157mw adding a coupling capacitor improves the package power dissipation because there is no dc current to the load, as shown in figure 2. therefore, p ic(diss) = v rms i rms cos q = 38.6mw the absolute maximum power-dissipation rating of this package would be exceeded if the configuration in figure 1 were used with all four of the max4169esd? amplifiers at a high ambient temperature of +75 c (157mw x 4 amplifiers = 628mw + a derating of 8.33mw/ c x 5 c = 669mw). note that 669mw just exceeds the absolute maximum power dissipation of 667mw for the 14-pin so package (see the absolute maximum ratings section). v v v i + i 2 rms cc dc rms peak @ - ( ) - = - - = @ = + = . . . . . / . v v v v v i a v ma peak rms dc rms 2 6 5 3 25 1 5 2 2 189 0 1 5 60 2 17 67 w v v v i + i 2 rms cc dc rms peak @ - ( ) - = - - = @ = + = . . . . . . / . v v v v v i v v ma peak rms dc rms 2 6 5 3 25 1 5 2 2 189 3 25 60 1 5 60 2 71 84 w w p v i cos ic diss rms rms ( ) @ q 6.5v v in = 3vp-p r c 60 w r max4165 max4166 figure 1. a circuit example where the max4165/max4166 is being used in single-supply operation 6.5v v in = 3vp-p r 60 w r c c c c c = 1 2 p r l f l max4165 max4166 figure 2. a circuit example where adding a coupling capacitor greatly reduces the power dissipation of its package
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown 10 ______________________________________________________________________________________ single-supply speaker driver the max4165/max4166 can be used as a single-sup - ply speaker driver, as shown in the typical operating circuit . capacitor c1 is used for blocking dc (a 0.1 f ceramic capacitor can be used). when choosing resis - tors r3 and r4, take into consideration the input bias current as well as how much supply current can be tol - erated. choose resistors r1 and r2 according to the amount of gain and current desired. capacitor c3 ensures unity gain for dc. a 10 f electrolytic capacitor is suitable for most applications. the coupling capaci - tor c2 sets a low-frequency pole and is fairly large in value. for a 32 load, a 100 f coupling capacitor gives a low-frequency pole at 50hz. the low-frequency pole can be set according to the following equation: | = 1 / 2 p (r l c2) bridge amplifier the circuit shown in figure 3 uses a dual max4167/ max4168 to implement a 3v, 200mw amplifier suitable for use in size-constrained applications. this configura - tion eliminates the need for the large coupling capaci - tor required by the single op-amp speaker driver when single-supply operation is a must. voltage gain is set to +10v/v; however, it can be changed by adjusting the 900k resistor value. dc voltage at the speaker is limit - ed to 10mv. the 47 and 0.1 f capacitors across the speaker maintain a low impedance at the load as fre - quency increases. rail-to-rail input stage devices in the max4165?ax4169 family of high-out - put-current amplifiers have rail-to-rail input and output stages designed for low-voltage, single-supply opera - tion. the input stage consists of separate npn and pnp differential stages that combine to provide an input common-mode range that extends 0.25v beyond the supply rails. the pnp stage is active for input volt - ages close to the negative rail, and the npn stage is active for input voltages near the positive rail. the switchover transition region, which occurs near v cc / 2, has been extended to minimize the slight degradation in common-mode rejection ratio caused by mismatch of the input pairs. v cc = +3v 900k v cc = +3v v cc = +3v 47 w 4.7k 4.7k 0.1 m f 1 m f 0.1 m f input 0.25vp-p 32 w 100k 100k 100k 100k 100k 100k 1/2 max4167 1/2 max4168 1/2 max4167 1/2 max4168 figure 3. dual max4167/max4168 bridge amplifier for 200mw at 3v r3 r3 = r1 r2 r1 r2 max4165 max4166 max4167 max4168 max4169 figure 4. reducing offset error due to bias current (noninverting) r3 r3 = r1 r2 r1 r2 max4165 max4166 max4167 max4168 max4169 figure 5. reducing offset error due to bias current (inverting)
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown ______________________________________________________________________________________ 11 since the input stage switches between the npn and pnp pairs, the input bias current changes polarity as the input voltage passes through the transition region. match the effective impedance seen by each input to reduce the offset error caused by input bias currents flowing through external source impedances (figures 4 and 5). high source impedances, together with input capaci - tance, can create a parasitic pole that produces an underdamped signal response. reducing the input impedance or placing a small (2pf to 10pf) capacitor across the feedback resistor improves response. the max4165?ax4169? inputs are protected from large differential input voltages by 1k series resistors and back-to-back triple diodes across the inputs (figure 6). for differential voltages less than 1.8v, input resistance is typically 500k . for differential input voltages greater than 1.8v, input resistance is approximately 2k . the input bias current is given by the following equation: i bias = (v diff - 1.8v) / 2k rail-to-rail output stage the minimum output is within millivolts of ground for single-supply operation, where the load is referenced to ground (v ee ). figure 7 shows the input voltage range and the output voltage swing of a max4165 connected as a voltage follower. the maximum output voltage swing is load dependent; however, it is guaranteed to be within 430mv of the positive rail (v cc = 5v) even with maximum load (25 to ground). driving capacitive loads the max4165?ax4169 have a high tolerance for capacitive loads. they are stable with capacitive loads up to 250pf. figure 8 is a graph of the stable operating region for various capacitive loads vs. resistive loads. figures 9 and 10 show the transient response with excessive capacitive loads (1500pf), with and without the addition of an isolation resistor in series with the output. figure 11 shows a typical noninverting capaci - tive-load-driving circuit in the unity-gain configuration. the resistor improves the circuit? phase margin by iso - lating the load capacitor from the op amp? output. 1k 1k figure 6. input protection circuit in (1v/div) out (1v/div) max4165-fig07 time (5 m s/div) v cc = +3.0v r l = 100k w figure 7. rail-to-rail input/output range
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown 12 ______________________________________________________________________________________ power-up and shutdown modes the max4166/max4168 have a shutdown option. when the shutdown pin ( shdn ) is pulled low, supply current drops to 58 a per amplifier (v cc = +5v), the amplifiers are disabled, and their outputs are placed in a high-impedance state. pulling shdn high or leaving it floating enables the amplifier. in the dual max4168, the two amplifiers shut down independently. figures 12 and 13 show the max4166? output voltage and sup - ply-current responses to a shutdown pulse. the max4166?ax4169 typically settle within 5 s after power-up (figure 14). power supplies and layout the max4165?ax4169 can operate from a single +2.7v to +6.5v supply, or from dual 1.35v to 3.25v supplies. for single-supply operation, bypass the power supply with a 0.1 f ceramic capacitor in parallel with at least 1 f. for dual-supply operation, bypass each supply to ground. good layout improves performance by decreasing the amount of stray capac - itance at the op amps?inputs and outputs. decrease stray capacitance by placing external components close to the op amps?pins, minimizing trace and lead lengths. 1300 0 10 100k 100 200 300 400 1100 1200 max4165-fig08 resistive load (k w ) capacitive load (pf) 100 1k 10k 1000 900 800 700 600 500 stable region v cc = +5.0v r l to v cc / 2 unstable region figure 8. capacitive load stability in (20mv/div) out (20mv/div) max4165-fig09 time (1 m s/div) v cc = +3.0v, c l = 1500pf r l = 100k w , r iso = 0 w figure 9. small-signal transient response with excessive capacitive load in (20mv/div) out (20mv/div) max4165-fig10 time (1 m s/div) v cc = +3.0v, c l = 1500pf r l = 100k w , r iso = 39 w figure 10. small-signal transient response with excessive capacitive load with isolation resistor r iso c l figure 11. capacitive-load-driving circuit
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown ______________________________________________________________________________________ 13 shdn (1v/div) out (1v/div) max4165-fig12 time (5 m s/div) figure 12. shutdown output voltage enable/disable shdn (1v/div) i cc (1ma/div) max4165-fig13 time (50 m s/div) figure 13. shutdown enable/disable supply current v cc (1v/div) out (2v/div) max4165-fig14 time (5 m s/div) figure 14. power-up/down output voltage v cc (1v/div) i ee (1ma/div) max4165-fig15 time (5 m s/div) figure 15. power-up/down supply current
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown 14 ______________________________________________________________________________________ pin configurations (continued) out n.c. v ee 1 2 8 7 shdn v cc in- in+ n.c. dip/so/ m max top view 3 4 6 5 max4166 in2- in2+ v ee 1 2 8 7 v cc out2 in1- in1+ out1 dip/so 3 4 6 5 max4167 1 2 3 4 5 10 9 8 7 6 v cc out2 in2- in2+ v ee in1+ in1- out1 max4168 m max shdn2 shdn1 14 13 12 11 10 9 8 1 2 3 4 5 6 7 v cc out2 in2- in2+ v ee in1+ in1- out1 max4168 n.c. shdn2 n.c. n.c. shdn1 n.c. dip/so 14 13 12 11 10 9 8 1 2 3 4 5 6 7 out4 in4- in4+ v ee v cc in1+ in1- out1 max4169 in3+ in3- out3 out2 in2- in2+ dip/so
max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown ______________________________________________________________________________________ 15 t ypical operating cir cuit ___________________ chip infor mation or dering infor mation (continued) v cc r2 c2 c1 v in 32 w r4 r1 c3 r3 max4165 max4166 max4165 transistor count: 230 max4166 transistor count: 230 max4167 transistor count: 462 max4168 transistor count: 462 max4169 transistor count: 924 part max4167 epa max4167esa max4168 epd -40 c to +85 c -40 c to +85 c -40 c to +85 c temp. range pin- package 8 plastic dip 8 so 14 plastic dip max4168esd -40 c to +85 c 14 so sot top mark max4168eub max4169 epd -40 c to +85 c -40 c to +85 c 10 max 14 plastic dip max4169esd -40 c to +85 c 14 so package infor mation 8lumaxd.eps
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. 16 ____________________ maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 1997 maxim integrated products printed usa is a registered trademark of maxim integrated products. max4165?ax4169 high-output-drive, pr ecision, low-power , single- supply , rail-to-rail i/o op amps with shutdown package infor mation (continued) sot5l.eps 10lumaxb.eps

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