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general description the single max4036/max4037 and dual max4038/max4039 operational amplifiers operate from a single +1.4v to +3.6v (without reference) or +1.8v to +3.6v (with reference) supply and consume only 800na of supply current per amplifier, and 1.1? for the optional refer- ence. the max4036/max4038 feature a common-mode input voltage range from 0v to v dd - 0.4v at v dd = 1.4v. the max4037/max4039 feature a 1.232v voltage refer-ence capable of sourcing 100? and sinking 20?. the max4036?ax4039s?rail-to-rail outputs drive 5k loads to within 25mv of the rails. ultra-low supply current,low operating voltage, and rail-to-rail outputs make the max4036?ax4039 ideal for use in single-cell lithium-ion (li+), or two-cell nicd/nimh/alkaline battery-powered applications. the max4036 is available in an sc70 package, the max4037 in a sot23 package, and the max4038/ max4039 in ucsp, ?ax , and tdfn packages. applications battery-powered/solar-powered systemsportable medical instrumentation pagers and cell phones micropower thermostats and potentiostats electrometer amplifiers remote sensor amplifiers active badges ph meters features ? ultra-low 800na per amplifier supply current ? ultra-low 1.4v supply voltage operation (1.8v for max4037/max4039) ? rail-to-rail outputs drive 5k and 5000pf load ? 1.232v 0.5%, 120ppm/c (max) reference (max4037/max4039) ? no external reference bypass capacitor required ? no phase reversal for overdriven inputs ? low 1.0pa (typ) input bias current ? low 200 v input offset voltage ? unity-gain stable ? available in tiny ucsp, sc70, sot23, tdfn, and max packages ? available in -40c to +125c temperature range (max4036a/max4038a) max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ___________________________________________________ _____________ maxim integrated products 1 ina+ sensor ref three-electrode potentiostat application inb+ outa inb- outb ina- v dd v ss max4039 3v adc typical operating circuit ordering information max4039 outa ref ina-ina+ v ss outb inb- inb+ v dd ref functional diagram 19-3142; rev 5; 11/09 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. + denotes a lead(pb)-free/rohs-compliant package. - denotes a package containing lead. * ep = exposed pad. ordering information continued at end of data sheet. ?ax is a registered trademark and ucsp is a trademark of maxim integrated products, inc. part temp range pin-package top mark max4036 exk-t -40? to +85? 5 sc70 afr max4036aaxk+t -40? to +125? 5 sc70 asn max4037 eut-t -40? to +85? 6 sot23 abrx max4038 eta-t -40? to +85? 8 tdfn-ep* ago max4038eua -40? to +85? 8 ?ax max4038ebl-t -40? to +85? 9 ucsp aeg max4038aaua -40? to +125? 8 ?ax pin configurations and selector guide appear at end of data sheet. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 2 __________________________________________________ _____________________________________ absolute maximum ratings electrical characteristics (v dd = +3v, v ss = v cm = 0v, v out_ = v dd /2, r l to v dd /2, c l = 15pf, t a = +25c , unless otherwise specified.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v dd to v ss .............................................................-0.3v to +4.0v ina+, inb+, ina-, inb-, in+, in-, outa, outb, out, ref .........................(v ss - 0.3v) to (v dd + 0.3v) outa, outb, out, ref shorted to v ss or v dd .......continuous maximum continuous power dissipation (t a = +70?) 5-pin sc70 (derate 3.1mw/? above +70?) ..............247mw 6-pin sot23 (derate 8.7mw/? above +70?)............696mw 8-pin ?ax (derate 4.5mw/? above +70?) .............362mw 8-pin tdfn (derate 24.4mw/? above +70?) .........1951mw 9-bump ucsp (derate 5.2mw/? above +70?).........412mw 10-pin ?ax (derate 5.6mw/? above +70?) ...........444mw 10-pin tdfn (derate 24.4mw/? above +70?) .......1951mw operating temperature range max403_e_ _...................................................-40? to +85? max403_a_ _ ................................................-40? to +125? junction temperature .....................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units max4036/max4038, guaranteed by psrrtests 1.4 3.6 supply voltage range v dd max4037/max4039, guaranteed by psrrand line regulation tests 1.8 3.6 v v dd = 1.4v 0.8 1.2 max4036 v dd = 3.6v 0.9 1.3 v dd = 1.8v 1.9 2.4 max4037 v dd = 3.6v 2.0 2.5 v dd = 1.4v 1.7 2.3 max4038 v dd = 3.6v 1.9 2.5 v dd = 1.8v 2.8 4.0 supply current i dd max4039 v dd = 3.6v 3.0 4.1 ? operational amplifiers input offset voltage v os ?.2 ?.0 mv input bias current i b (note 1) ?.0 ?0 pa input offset current i os (note 1) ?.3 ?0 pa v d d = 1.4v ( m ax 4036/m ax 4038 onl y) v ss v dd - 0.4 v dd = 1.8v v ss v dd - 0.3 input common-mode voltagerange v cm guaranteed bycmrr test v dd = 3.3v v ss v dd - 0.2 v v dd = 1.4v, v ss v cm (v dd - 0.4v) (max4036/max4038 only) 50 70 v dd = 1.8v, v ss v cm (v dd - 0.3v) 50 70 common-mode rejection ratio cmrr v dd = 3.3v, v ss v cm (v dd - 0.2v) 56 76 db 1.4v v dd 3.6v (max4036/max4038 only) 62 82 power-supply rejection ratio psrr 1.8v v dd 3.6v 62 84 db downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ___________________________________________________ ____________________________________ 3 electrical characteristics (continued) (v dd = +3v, v ss = v cm = 0v, v out_ = v dd /2, r l to v dd /2, c l = 15pf, t a = +25c , unless otherwise specified.) parameter symbol conditions min typ max units r l = 100k , 50mv v out (v dd - 50mv) 80 108 large-signal voltage gain a vol r l = 5k , 150mv v out (v dd - 150mv) 78 105 db r l = 100k 25 output voltage swing high v dd - v oh r l = 5k 25 50 mv r l = 100k 25 output voltage swing low v ol - v ss r l = 5k 25 50 mv output short-circuit current i sco to v dd or v ss ?3 ma gain-bandwidth product gbw 4 khz phase margin m 90 degrees slew rate sr 4 v/ms power-on time t on (note 3) 0.25 ms input noise-voltage density e n f = 1khz 500 nv/ hz capacitive-load stability c load a vcl = 1v/v, no sustained oscillations 5000 pf reference (max4037/max4039) reference voltage v ref 1.226 1.232 1.238 v line regulation ? v ref / ? v dd v dd = +1.8v to +3.6v 0.3 %/v 0 i load 100?, sourcing 0.0015 load regulation ? v ref / ? i load -20? i load 0, sinking 0.0075 %/? reference output voltage noise e n 0.1hz to 10hz 60 ? p-p short to v dd 0.25 output short-circuit current i scr short to v ss 1.9 ma capacitive-load stability range c load (note 1) 0 250 pf electrical characteristics (v dd = +3v, v ss = v cm = 0v, v out_ = v dd /2, r l to v dd /2, c l = 15pf, t a = t min to t max , unless otherwise specified.) (note 2) parameter symbol conditions min typ max units max4036/max4038, guaranteed by psrrtest 1.4 3.6 supply voltage range v dd max4037/max4039, guaranteed by psrrand line regulation tests 1.8 3.6 v v dd = 1.4v 1.7 max4036 v dd = 3.6v 1.8 v dd = 1.4v 2.0 max4036a v dd = 3.6v 2.1 v dd = 1.8v 3.1 supply current i dd max4037 v dd = 3.6v 3.2 ? downloaded from: http:///
electrical characteristics (continued) (v dd = +3v, v ss = v cm = 0v, v out_ = v dd /2, r l to v dd /2, c l = 15pf, t a = t min to t max , unless otherwise specified.) (note 2) parameter symbol conditions min typ max units v dd = 1.4v 2.9 max4038 v dd = 3.6v 3.2 v dd = 1.4v 3.4 max4038a v dd = 3.6v 3.7 v dd = 1.8v 5.2 supply current i dd max4039 v dd = 3.6v 5.3 ? operational amplifiers input offset voltage v os ? mv input offset voltage temperaturecoefficient tcv os ? ?/? input bias current i b ?00 pa input offset current i os ?00 pa v dd = 1.4v (max4036/max4038 only) v ss v dd - 0.4 v dd = 1.8v v ss v dd - 0.4 input common-mode voltagerange v cm guaranteed bycmrr test v dd = 3.3v v ss v dd - 0.2 v v dd = 1.4v, v ss v cm (v dd - 0.5v) (max4036/max4038 only) 44 v dd = 1.8v, v ss v cm (v dd - 0.4v) 50 common-mode rejection ratio cmrr v dd = 3.3v, v ss v cm (v dd - 0.3v) 52 db 1.4v v dd 3.6v (max4036/max4038 only) 60 power-supply rejection ratio psrr 1.8v v dd 3.6v 60 db r l = 100k , 50mv v out (v dd - 50mv) 75 large-signal voltage gain a vol r l = 5k , 150mv v out (v dd - 150mv) 73 db r l = 100k 10 output voltage swing high v dd - v oh r l = 5k 100 mv r l = 100k 10 output voltage swing low v ol - v ss r l = 5k 100 mv reference (max4037/max4039) max4037eut-t, max4039etb,max4039eub 25 120 reference voltage temperaturecoefficient tcv ref (note 1) max4039ebl-t 35 200 ppm/? line regulation ? v ref / ? v dd v dd = 1.8v to 3.6v 0.6 %/v 0 i load 100?, sourcing 0.003 load regulation ? v ref / ? i load -20? i load 0, sinking 0.015 %/? capacitive-load stability range c load (note 1) 0 250 pf note 1: guaranteed by design. note 2: all devices are production tested at t a = +25?. all temperature limits are guaranteed by design. note 3: output settles within 1% of final value. max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 4 __________________________________________________ _____________________________________ downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference _______________________________________________________________________________________ 5 max4036 supply current vs. supply voltage and temperature max4036 toc01 supply voltage (v) supply current ( a) 3.0 2.6 2.2 1.8 0.4 0.8 1.2 1.6 0 1.4 3.4 t a = +85 c t a = -40 c t a = +25 c max4037 supply current vs. supply voltage and temperature max4036 toc02 supply voltage (v) supply current ( a) 3.3 3.0 2.7 2.4 2.1 0.5 1.0 1.5 2.0 2.5 3.0 0 1.8 3.6 t a = +85 c t a = -40 c t a = +25 c max4038 supply current vs. supply voltage and temperature max4036 toc03 supply voltage (v) supply current ( a) 3.0 2.6 2.2 1.8 0.5 1.51.0 2.0 2.5 3.0 0 1.4 3.4 t a = +85 c t a = -40 c t a = +25 c max4039 supply current vs. supply voltage and temperature max4036 toc04 supply voltage (v) supply current ( a) 3.3 3.0 2.7 2.4 2.1 1 2 43 50 1.8 3.6 t a = +85 c t a = -40 c t a = +25 c offset voltage vs. common-mode voltage max4036 toc05 common-mode voltage (v) offset voltage (mv) 2 1 0.2 0.4 0.6 0.8 1.0 0 03 v dd = 1.4v v dd = 1.8v v dd = 3.0v offset voltage vs. temperature max4036 toc06 temperature ( c) offset voltage (mv) 60 35 10 -15 -0.20 -0.10 0 0.10 0.20 0.30 -0.30 -40 85 input bias current vs. temperature max4036 toc07 temperature ( c) input bias current (pa) 60 35 10 -15 0 10 20 30 40 -10 -40 85 v cm = 3v v cm = 0v input bias current vs. common-mode voltage max4036 toc08 common-mode voltage (v) input bias current (pa) 2.5 2.0 1.5 1.0 0.5 10 20 30 40 0 0 3.0 t a = +25 c t a = +85 c -10 -100 10 10k 1k 100 op amp power-supply rejection ratio vs. frequency -70 -90 -30 -50 0 -60 -80 -20 -40 max4036 toc09 frequency (hz) psrr (db) a v = 1v/v typical operating characteristics (v dd = 3v, v ss = v cm = 0v, r l to v dd /2, t a = +25?, unless otherwise noted.) downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 6 __________________________________________________ _____________________________________ output voltage swing high vs. temperature max4036 toc10 temperature ( c) v dd - v oh (mv) 60 35 10 -15 5 10 15 20 25 30 0 -40 85 r l = 5k r l = 100k output voltage swing low vs. temperature max4036 toc11 temperature ( c) v ol - v ss (mv) 60 35 10 -15 5 10 15 20 25 30 35 0 -40 85 r l = 100k r l = 5k a v vs. output swing low max4036 toc12 v ol (mv) a v (db) 400 300 100 200 60 80 100 120 140 40 0 500 r l = 5k r l = 100k a v vs. output swing high max4036 toc13 v dd - v oh (mv) a v (db) 400 300 100 200 60 80 100 120 140 40 0 500 r l = 5k r l = 100k a v vs. temperature max4036 toc14 temperature ( c ) a vol (db) 60 35 10 -15 20 40 60 80 100 120 140 0 -40 85 r l = 100k r l = 5k 0 -100 0 0.1 10k 100k crosstalk vs. frequency -60 -80 -40 -20 max4036 toc15 fre q uency ( hz ) crosstalk (db) 1k r l = 5k r l = 100k a v = 1v/v max4038/max4039 100 0.01 0.01 0.1 10 100 total harmonic distortion plus nois e vs. frequency 0.1 1 10 max4036 toc16 frequency (khz) thd+n (%) 1 a v = 1v/v v in_ = v dd /2 v out = 2.5v p-p r l = 100k to v ss v out = 2.5v p-p r l = 5k to v ss 100,000 100 10k 100k 1m op amp stability vs. capacitive and resistive loads max4036 toc17 resistive load ( ) capacitive load (pf) 1000 10,000 stableregion r l to v ss unstableregion op amp sink current vs. output voltage max4036 toc18 v out_ (v) sink current (ma) 2.4 1.8 1.2 0.6 2 4 6 8 10 12 14 0 0 3.0 v dd = 3.0v v dd = 1.8v v id = -100mv typical operating characteristics (continued) (v dd = 3v, v ss = v cm = 0v, r l to v dd /2, t a = +25?, unless otherwise noted.) downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ________________________________________________________________________________________ 7 op amp source current vs. output voltage max4036 toc19 v out_ (v) source current (ma) 2.4 1.8 1.2 0.6 2 4 6 8 10 12 14 16 18 0 0 3.0 v dd = 3.0v v dd = 1.8v v id = +100mv input voltage noise density vs. frequency max4036 toc20 frequency (hz) input voltage noise (nv/ hz) 1k 100 10 1 500 1000 1500 2000 2500 3000 3500 0 0.1 10k op amp small-signal transient response max4036 toc21 2.55v2.45v 2.55v 2.45v v in + v out_ a v = 1v/v c l = 12pf to v ss r l = 1m to v ss op amp small-signal transient response max4036 toc22 40 s/div a v = 1v/v c l = 250pf to v ss r l = 1m to v ss v in + v out_ 2.55v2.45v 2.55v 2.45v op amp large-signal transient response max4036 toc23 100 s/div a v = 1v/v c l = 12pf to v ss r l = 1m to v ss v in + v out_ 500mv/div 2.5v1.5v op amp turn-on transient response max4036 toc24 100 s/div 3.0v 0v v out_ 50mv/div a v = 1v/v c l = 12pf to gnd r l = 1m to gnd v in + = v dd / 2 v dd typical operating characteristics (continued) (v dd = 3v, v ss = v cm = 0v, r l to v dd /2, t a = +25?, unless otherwise noted.) downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 8 __________________________________________________ _____________________________________ 8070 60 50 40 30 20 10 0 -10-20 -30 -40 1 10 100 1k 10k 100k gain and phase vs. frequency max4036 toc25 frequency (hz) gain (db) 180135 90 45 0 -45 -90 -135 phase (degrees) a v = 1000v/v v in_ = 1mv p-p gain phase 2 -30 100 10k 100k large-signal gain vs. frequency -22-26 -18 -14 -10 -6 -2 max4036 toc26 frequency (hz) gain (db) 1k r l = 1m a v = 1 v out_ = 1v p-p c l = 12pf r l = 100k r l = 5k reference voltage vs. temperature max4036 toc27 temperature ( c) v ref (v) 60 35 10 -15 1.228 1.230 1.232 1.234 1.2361.226 -40 85 max4037/max4039 reference voltage change vs. time max4036 toc28 time (hr) v ref (v) 500 400 300 200 100 1.231 1.232 1.233 1.2341.230 0 600 max4037 max4039 reference voltage change vs. load current max4036 toc29 load current ( a ) normalized v ref 400 300 200 100 0 0.99 1.00 1.01 1.020.98 -100 500 t a = +85 c t a = +25 c t a = -40 c reference voltage change vs. supply voltage max4036 toc30 v dd (v) normalized v ref 3.3 3.0 2.1 2.4 2.7 0.9996 0.9997 0.9998 0.9999 1.0000 1.0001 1.0002 1.00030.9995 1.8 3.6 t a = +85 c t a = +25 c t a = -40 c typical operating characteristics (continued) (v dd = 3v, v ss = v cm = 0v, r l to v dd /2, t a = +25?, unless otherwise noted.) reference line-transient response max4036 toc31 1ms/div v dd v ref ac-coupled 50mv/div 0v 1.8v 3.6v downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference _______________________________________________________________________________________ 9 reference load-transient response (sinking current) max4036 toc32 2.5ms/div 0 v ref 500mv/div 0 2 a i ref max4036 toc33 2.5ms/div 00 20 a i ref v ref 500mv/div reference load-transient response (sinking current) reference load-transient response (sourcing current) max4036 toc34 1ms/div 00 i ref 10 a v ref 500mv/div max4036 toc35 1ms/div 00 i ref 100 a v ref 500mv/div reference load-transient response (sourcing current) reference turn-on transient response max4036 toc36 1ms/div v dd 0v 3v0v v ref 0.1hz to 10hz reference noise max4036 toc37 1s/div 20 v/div typical operating characteristics (continued) (v dd = 3v, v ss = v cm = 0v, r l to v dd /2, t a = +25?, unless otherwise noted.) downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 10 _________________________________________________ _____________________________________ detailed description the max4036?ax4039 consume an ultra-low supplycurrent and have rail-to-rail output stages specifically designed for low-voltage operation. the input common- mode voltage range extends from v dd - 0.4v to v ss , although full rail-to-rail input range is possible withdegraded performance when operating from a supply voltage above 3.0v. the input offset voltage is typically 200?. low-operating supply voltage, low supply current, and rail-to-rail outputs make the max4036?ax4039 an excellent choice for precision or general-purpose low- voltage, battery-powered systems. rail-to-rail outputs the max4036?ax4039 output stages can drive a 5k load and still swing to within 40mv of the rails. figure 1shows the output voltage swing of the max4036 max4039 configured as a unity-gain buffer, powered from a single 2.4v supply. the output for this setup typi- cally swings from 5mv to v dd - 5mv with a 100k load. pin max4038/ max4038a max4039 max4036/ max4036a max4037 ?ax*/tdfn ucsp ?ax/tdf ucsp name function 1 3 in+ noninverting amplifier input 2 2 4 a2 5 a2 v ss negative power-supply voltage 3 4 in- inverting amplifier input 4 1 out amplifier output 56 8c 21 0c 2v dd positive power-supply voltage 5 6 b2 ref reference voltage output 1 c1 1 c1 outa amplifier output (channel a) 2 b1 2 b1 ina- inverting amplifier input (channel a) 3 a1 3 a1 ina+ noninverting amplifier input (channel a) 5 a3 7 a3 inb+ noninverting amplifier input (channel b) 6 b3 8 b3 inb- inverting amplifier input (channel b) 7 c3 9 c3 outb amplifier output (channel b) b2 4 n.c. no connection. not internally connected. ep (tdfn only) exposed paddle. solder ep to v ss or leave unconnected (tdfn packages only). 2ms/div 1v/div v in_+ 1.5v1.5v v out+ a v = 1v/v figure 1. rail-to-rail input/output voltage range * both max4038/max4038a available in ?ax package only. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ___________________________________________________ ___________________________________ 11 applications information power-supply considerations the max4036?ax4039 operate from a single 1.4v(max4036/max4038) or 1.8v (max4037/max4039) to 3.6v supply. a high amplifier power-supply rejection ratio of 82db and the excellent reference line regulation allow the devices to be powered directly from a decay- ing battery voltage, simplifying design and extending battery life. the max4036?ax4039 are ideally suited for low-voltage battery-powered systems. the typical operating characteristics show the changes in supply current and reference output as a function of supplyvoltage. power-up settling time the max4036?ax4039 typically require 0.25ms topower-up. during this startup time, the output is inde- terminate. the application circuit should allow for this initial delay. see the typical operating characteristics for amplifier and reference settling time curves. driving capacitive loads: op amps the max4036?ax4039 amplifier(s) require no outputcapacitor for stability, and are unity-gain stable for loads up to 5000pf. applications that require greater capacitive-drive capability should use an isolation resistor between the output and the capacitive load (figure 2). note that this solution reduces the gain and output voltage swing because r iso forms a voltage- divider with the load resistor. crossover distortion the max4036?ax4039 output stages are capable ofsourcing and sinking currents with orders of magnitude greater than the stages?quiescent current, which is less than 1?. this ability to drive heavy loads with such a small quiescent current introduces crossover distortion as the output stage passes between sinkingand sourcing. in the crossover regions, the output impedance of the max4036?ax4039 increases sub- stantially, thereby changing the load-driving character- istics. the distortion can be greatly reduced by increasing the load resistance. for applications where low load resistance is required, bias the load such that the output current is always in one direction, to avoid crossover distortion. reference bypassing the max4037/max4039 reference requires no externalcapacitors. using the max4036?ax4039 as a comparator although optimized for use as an operational amplifier,the max4036?ax4039 can be used as a rail-to-rail i/o comparator (figures 3, 4). external hysteresis can be used to minimize the risk of output oscillation. the positive feedback circuit, shown in figure 4, causes the input threshold to change when the output voltage changes state. battery monitoring using the max4037/max4039 and hysteresis the internal reference and low operating voltage of themax4037/max4039 make the devices ideal for battery- monitoring applications. hysteresis can be set using resistors as shown in figure 4, and the following design procedure: 1) choose r3. the input bias current of in_+ is under 100pa over temperature, so a current through r3around 100na maintains accuracy. the current through r3 at the trip point is v ref / r3, or 100na for r3 = 12m . 10m is a good practical value. 2) choose the hysteresis voltage (v hb ), the voltage between the upper and lower thresholds. in thisexample, choose v hb = 50mv (see figure 3). max4038 r iso r l c l r l r l + r iso a v = = 1 figure 2. using a resistor to isolate a capacitive load from the op amp v hb v oh v ol v thr v thf input output figure 3. hysteresis downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 12 _________________________________________________ _____________________________________ 3) calculate r1: 4) choose the threshold voltage for v in rising (v thr ). in this example, choose v thr = 2.0v. 5) calculate r2: 6) verify the threshold voltages with these formulas: v in rising: v in falling: in this application, the max4036?ax4039 supply cur-rent will vary, depending on the output state of the comparator. power supplies and layout the max4036?ax4039 operate from a single 1.4v(max4036/max4038) or 1.8v (max4037/max4039) to 3.6v power supply. bypass v dd with a 0.1? capacitor to ground to minimize noise.good layout techniques optimize performance by decreasing the amount of stray capacitance to the op amp? inputs and outputs. to decrease stray capaci- tance, minimize trace lengths by placing external com- ponents close to the device. the exposed paddle (ep) on the tdfn packages of the max4038 and max4039 is internally connected to the device substrate, v ss . connect the exposed paddle to v ss or leave ep unconnected. running traces below the exposed paddle is not recommended. chip information max4036 transistor count: 49max4037 transistor count: 119 max4038 transistor count: 146 max4039 transistor count: 146 process: bicmos vv rv r thf thr dd = ? ? ? ? ? ? 1 3 vvr rr r thr ref =++ ? ? ? ? ? ? 1 1 1 1 2 1 3 r v vrrr v vk k m k thr ref 2 1 1 1 1 1 3 1 20 1 2 210 1 210 1 10 325 . . = ? ? ? ? ? ? ? ? ? ? ? ? ? ? = ? ? ? ? ? ? ? ? ? ? ? ? = ?? rr vv m v v k hbdd 13 10 05 24 210 . . = = = v ref r3 r1r2 v batt v bgood v ss v ss v dd v dd in+ref in- out max4037 figure 4. battery monitoring selector guide part no. of amplifiers reference max4036 1 max4037 1 max4038 2 max4039 2 ordering information (continued) part temp range pin-package top mark max4039 ebl-t -40? to +85? 9 ucsp aeh max4039etb-t -40? to +85? 10 tdfn-ep* aan max4039eub -40? to +85? 10 ?ax - denotes a package containing lead. * ep = exposed pad. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ___________________________________________________ ___________________________________ 13 pin configurations inb- outbinb+ v ss 12 8 7 v dd ina- ina+ outa max 3 4 6 5 1 23 45 10 98 7 6 v dd outbinb- inb+ n.c. ina+ ina- outa max ref v ss out in+ 12 3 64 in- v ss v ss v ss v dd v dd v dd sot23 5 ref in+ in- 12 3 54 out v ss v dd sc70 top view outa ina- ina+ n.c. outbinb- inb+ ref 3mm x 3mm x 0.8mm tdfn outa ina- ina+ 12 3 4 1 2 3 4 5 outbinb- inb+ 87 6 5 8 7 6 9 10 3mm x 3mm x 0.8mm tdfn max4036 max4036a max4037 max4038 max4038a max4038 max4039 max4039 c ab ucsp max4038 inb+ v ss ina+ inb- ina- n.c. v dd outb outa 123 c ab ucsp max4039 inb+ v ss ina+ inb- ina- ref v dd outb outa 123 (bump side down) tdfn exposed pad connected to v ss . tdfn exposed pad connected to v ss . (bump side down) downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 14 _________________________________________________ _____________________________________ sc70, 5l.eps package outline, 5l sc70 21-0076 1 1 e package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ___________________________________________________ ___________________________________ 15 6lsot.eps package outline, sot 6l body 21-0058 2 1 i package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 16 _________________________________________________ _____________________________________ package outline, sot 6l body 21-0058 2 2 i package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ___________________________________________________ ___________________________________ 17 package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 18 _________________________________________________ _____________________________________ package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ___________________________________________________ ___________________________________ 19 common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l0 . 2 0 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref 2.300.10 mo229 / weed-3 2.00 ref 0.250.05 0.50 bsc 1.500.10 10 t1033-2 0.250.05 2.00 ref 10 0.50 bsc mo229 / weed-3 2.300.10 1.500.10 t1033mk-1 0.40 bsc - - - - 0.200.05 2.40 ref t1433-3f 14 2.300.10 1.700.10 package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference 20 _________________________________________________ _____________________________________ 10lumax.eps package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference ___________________________________________________ ___________________________________ 21 9lucsp, 3x3.eps package outline, 3x3 ucsp 21-0093 1 1 l package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max4036?ax4039 low i bias , +1.4v/800na, rail-to-rail op amps with +1.2v buffered reference maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 5 11 /09 updated toc 20 7 downloaded from: http:///

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