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19-6375; rev 5; 1/14 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX44246.related. typical operating circuit max is a registered trademark of maxim integrated products, inc. general description the max44241/max44243/MAX44246 are 36v, ultra- precision, low-noise, low-drift, single/quad/dual opera - tional amplifiers that offer near-zero dc offset and drift through the use of patented chopper stabilized and auto-zeroing techniques. this method constantly mea - sures and compensates the input offset, eliminating drift over time and temperature and the effect of 1/f noise. these single/quad/dual devices feature rail-to-rail out- puts, operate from a single 2.7v to 36v supply or dual 1.35v to 18v supplies, and consume only 0.42ma per channel, with only 9nv/ hz input-referred voltage noise. the ics are unity-gain stable with a gain-bandwidth product of 5mhz. with excellent specifications such as offset voltage of 5fv (max), drift of 20nv/nc (max), and 117nv p-p noise in 0.1hz to 10hz, these ics are ideally suited for applications requiring ultra-low noise, and dc precision such as interfacing with pressure sensors, strain gauges, precision weight scales, and medical instrumentation. the ics are available in 8-pin fmaxm or so packages and are rated over the -40nc to +125nc temperature range. applications features s 2.7v to 36v power-supply range s ultra-low input v os : 5v (max) s low 20nv/c (max) of offset drift s low 9nv/ hz noise at 1khz s 1s fast settling time s 5mhz gain-bandwidth product s rail-to-rail output s integrated emi filter s low 0.55ma per channel (max) quiescent current s 8-pin max/so package battery-powered equipment plc analog i/o modules transducer amplifiers load cell amplifiers precision instrumentation 15v 15v 15v 3.3v 3v v dd micro- processor v out 50r g 50r g r g v ref v dd v ss v in- v in+ c 1 buffer buffer ? ma x44246 ? ma x44246 max11211 max6126 r r 15v 1.5v buffer r r r 1 output ? ma x44246 -15v -15v -15v max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maximintegrated.com.
2 supply voltage (v dd to gnd) ............................. -0.3v to +40v all other pins ................................ (gnd - 0.3v) to (v dd + 0.3v) short-circuit duration, outa, outb to either supply rail ............. 1s continuous input current (any pin) .................................. 20ma differential input current ................................................. q20ma differential input voltage (note 1) ....................................... .q6v continuous power dissipation (t a = +70nc) 5-pin sot23 (derate 3.9mw/ nc above +70nc) ....... 312.6mw 8-pin fmax (derate 4.8mw/nc above +70nc) ........ 387.8mw 8-pin so (derate 7.60mw/ nc above +70nc) ........... 606.1mw 14-pin so (derate 12.30mw/ nc above +70nc) ....... 987.7mw 14-pin tssop (derate 10mw/ nc above +70nc) ..... 796.8mw operating temperature range ........................ -40nc to +125nc junction temperature .................................................... +150nc storage temperature range ............................ -65nc to +150nc lead temperature (soldering,10s) ................................. +300nc soldering temperature (reflow) ...................................... +260nc absolute maximum ratings note 2: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. note 1: the amplifier inputs are connected by internal back-to-back clamp diodes. in order to minimize noise in the input stage, current-limiting resistors are not used. if differential input voltages exceeding 1v are applied, limit input current to 20ma. stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion 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. max junction-to-ambient thermal resistance ( q ja ) ..... 206.3nc/w junction-to-case thermal resistance ( q jc ) .............. 42nc/w so-8 junction-to-ambient thermal resistance ( q ja ) ........ 132nc/w junction-to-case thermal resistance ( q jc ) .............. 38nc/w so-14 junction-to-ambient thermal resistance ( q ja ) .......... 81nc/w junction-to-case thermal resistance ( q jc ) .............. 32nc/w sot23 junction-to-ambient thermal resistance ( q ja ) ..... 255.9nc/w junction-to-case thermal resistance ( q jc ) .............. 81nc/w tssop junction-to-ambient thermal resistance ( q ja ) ..... 100.4nc/w junction-to-case thermal resistance ( q jc ) .............. 30nc/w package thermal characteristics (note 2) electrical characteristics (v dd = 30v, v gnd = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values at t a = +25c.) (note 3) parameter symbol conditions min typ max units supply voltage range v dd guaranteed by psrr 2.7 36 v power-supply rejection ratio (note 4) psrr v dd = 2.7v to 36v, t a = +25nc 148 166 db v dd = 2.7v to 36v, -40 nc < t a < +125nc 146 quiescent current per amplifier i dd r l = j t a = +25nc 0.42 0.55 ma -40n c < t a < +125n c 0.60 power-up time t on 20 fs dc specifications input common-mode range v cm guaranteed by cmrr test (v gnd - 0.05) (v dd - 1.5) v common-mode rejection ratio (note 4) cmrr v cm = (v gnd - 0.05v) to (v dd - 1.5v) 146 166 db input offset voltage (note 4) v os 1 5 f v maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
3 electrical characteristics (continued) (v dd = 30v, v gnd = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values at t a = +25c.) (note 3) electrical characteristics (v dd = 10v, v gnd = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values at t a = +25c.) (note 3) parameter symbol conditions min typ max units input offset voltage drift (note 4) tc v os 1 20 nv/nc input bias current (note 4) i b t a = +25nc 300 600 pa -40n c < t a < +125n c 1250 input offset current (note 4) i os t a = +25nc 600 1200 pa -40n c < t a < +125n c 2500 open-loop gain (note 4) a vol (v gnd + 0.5v) p v out p (v dd C 0.5v) 154 168 db output short-circuit current noncontinuous sinking 40 ma sourcing 30 output voltage low v ol t a = +25nc 90 115 mv -40n c < t a < +125n c 180 output voltage high v oh t a = +25nc (v dd - 0.17) (v dd - 0.13) v -40n c < t a < +125n c (v dd - 0.25) ac specifications input voltage-noise density e n f = 1khz 9 nv/ hz input voltage noise 0.1hz < f < 10hz 117 nv p-p input capacitance c in 2 pf gain-bandwidth product gbw 5 mhz phase margin pm c l = 20pf 60 degrees slew rate sr a v = 1v/v, v out = 4v p-p 3.8 v/fs capacitive loading c l no sustained oscillation, a v = 1v/v 300 pf total harmonic distortion thd v out = 4v p-p , a v = +1v/v f = 1khz -96 db f = 20khz -77 v out = 2v p-p , a v = +1v/v f = 1khz -91 db f = 20khz -76 parameter symbol conditions min typ max units power supply quiescent current per amplifier i dd r l = j t a = +25nc 0.42 0.55 ma -40n c < t a < +125n c 0.60 power-up time t on 20 fs maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
4 electrical characteristics (continued) (v dd = 10v, v gnd = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values at t a = +25c.) (note 3) note 3: all devices are 100% production tested at t a = +25c. temperature limits are guaranteed by design. note 4: guaranteed by design. parameter symbol conditions min typ max units dc specifications input common-mode range v cm guaranteed by cmrr test (v gnd - 0.05) (v dd C 1.5) v common-mode rejection ratio (note 4) cmrr v cm = (v gnd - 0.05v) to (v dd - 1.5v) 140 158 db input offset voltage (note 4) v os 1 5 fv input offset voltage drift (note 4) tc v os 2.4 20 nv/nc input bias current (note 4) i b t a = +25nc 300 600 pa -40n c < t a < +125n c 1100 input offset current (note 4) i os t a = +25nc 600 1200 pa -40n c < t a < +125n c 2200 open-loop gain (note 4) a vol ( v gnd + 0.5v) v out (v dd - 0.5v) 144 164 db output short-circuit current noncontinuous sinking 40 ma sourcing 30 output voltage low v ol t a = +25nc 30 40 mv -40n c < t a < +125n c 60 output voltage high v oh t a = +25nc (v dd - 0.06) (v dd - 0.05) v -40n c < t a < +125n c (v dd - 0.09) ac specifications input voltage-noise density e n f = 1khz 9 nv/ hz input voltage noise 0.1hz < f < 10hz 117 nv p-p input capacitance c in 2 pf gain-bandwidth product gbw 5 mhz phase margin pm c l = 20pf 60 degrees slew rate sr a v = +1v/v, v out = 2v p-p , 10% to 90% 3.8 v/s capacitive loading c l no sustained oscillation, a v = 1v/v 300 pf total harmonic distortion thd v out = 2v p-p , a v = 1v/v f = 1khz -92 db f = 20khz -76 settling time to 0.01%, v out = 2v step, a v = 1v/v 1 s maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
5 typical operating characteristics (v dd = 10v, v gnd = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at t a = +25c.) (note 3) input offset voltage histogram max44241 toc01 offset voltage (v) percent occurence (%) 1.0 0 0.5 -0.5-1.0 5 10 15 20 25 30 35 0 -1.5 1.5 input offset voltage drift histogram max44241 toc02 offset voltage drift (v/c) percent occurrence (%) 0.003 0 0.002 -0.004 -0.002 -0.006 5 10 15 20 25 30 35 40 45 0 0.005 supply current per amplifier vs. supply voltage max44241 toc03 supply voltage (v) supply current (a) 35 30 20 25 10 15 5 04 0 50 100 150 200 250 300 350 400 450 500 v in = v dd /2 no load supply current per amplifier vs. temperature max44241 toc04 temperature (c) supply current (a) 100 75 50 25 0 -25 -50 125 400 410 420 430 440 450 460 470 390 v in = v dd /2 no load input bias current vs. v cm vs. temperature max44241 toc07 v cm (v) input bias current (pa) 8 7 5 6 1 2 3 4 0 -800 -600 -400 -200 0 200 400 600 800 1000 1200 1400 1600 1800 2000 -1000 -1 9 ib- ( t a = -40c) ib+ ( t a = +125c) ib- ( t a = +125c) ib+ ( t a = -40c) ib- ( t a = +25c) ib+ ( t a = +25c) input offset voltage vs. input common-mode voltage max44241 toc05 v cm (v) input offset voltage (v) 8 7 6 5 4 3 2 1 -2 -1 0 1 2 3 -3 09 -300 -200 -100 0 100 200 300 400 500 600 700 -50 0 50 100 150 input bias current (pa) temperature ( c) input bias current vs. temperature toc08 i b- i b+ input offset voltage vs. temperature max44241 toc06 input offset voltage (v) 5 -5 temperature (c) 1007550250-25-50 125 0 90 100 110 120 140 150 160 170 130 common-mode rejection ratio vs. temperature max44241 toc09 cmrr (db) 180 80 temperature (c) 1007550250-25-50 125 maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
6 typical operating characteristics (continued) (v dd = 10v, v gnd = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at t a = +25c.) (note 3) common-mode rejection ratio vs. frequency max44241 toc10 frequency (hz) magnitude (db) 1m100k 1k 10k 10 100 1 0 -20 20 40 60 80 100 120 140 160 -40 0.1 10m 100mv p-p 90 100 110 120 140 150 160 170 130 power-supply rejection ratio vs. temperature max44241 toc11 psrr (db) 180 80 temperature (c) 1007550250-25-50 125 open-loop gain vs. frequency max44241 toc12 frequency (hz) magnitude (db) 1m100k1k 10k 10 10010.01 0.1 10m100m 200 -50 0 50 100 150 v in = 100mv p-p output voltage low vs. temperature max44241 toc15 v ol (mv) 70 0 temperature (c) 1007550250-25-50 125 10 20 30 40 50 60 output voltage low vs. output sink current max44241 toc13 output sink current (ma) output voltage low (mv) 8 6 4 2 01 0 50 100 150 200 300 350 400 450 250 500 0 output voltage high vs. temperature max44241 toc16 output voltage high (v) 9.970 9.930 temperature (c) 1007550250-25-50 125 9.940 9.935 9.945 9.955 9.950 9.965 9.960 output voltage high vs. output source current max44241 toc14 output source current (ma) output voltage high (mv) 8 6 4 2 50 100 150 200 250 300 350 400 450 0 0 10 small-signal gain vs. frequency max44241 toc17 frequency (hz) magnitude (db) 1m100k 1k 10k 100 2 -20 10 100m10m -18 -16 -14 -12 -10 -8 -6 -4 -2 0 normalized gain, v in = 100mv p-p large-signal gain vs. frequency max44241 toc18 frequency (hz) magnitude (db) 10m1m 10k 100k 1k100 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 5 -50 10 100m normalized gain, v in = 2v p-p maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
7 typical operating characteristics (continued) (v dd = 10v, v gnd = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at t a = +25c.) (note 3) input voltage 0.1hz to 10hz noise max44241 toc20 1s /div 200nv/div small-signal (100mv p-p) step response vs. time max44241 toc21 1s /div v in 50mv/div v out 50mv/div 0.01 0.1 1 10 stability vs. capacitive and resistive load in parallel MAX44246 toc24 capacitive load (pf) resistive load (k i ) 1k 10k 100 0.001 100 100k unstable stable power-up time max44241 toc25 20s v in = v out = 0v v dd = v ss = 0v v dd = 10v 200mv/div 5v/div large-signal (2v p-p) step response vs. time max44241 toc22 1s /div v in 1v/div v out 1v/div stability vs. capacitive load and series isolation resistance max44241 toc23 capacitive load (pf) r iso ( i ) 1k 10k 1 10 100 0.1 100 100k unstable stable input voltage noise vs. frequency max44241 toc19 frequency (hz) input voltage noise (nv/hz) 10k1k10010 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 0 1 100k maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
8 typical operating characteristics (continued) (v dd = 10v, v gnd = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at t a = +25c.) (note 3) total harmonic distortion vs. frequency max44241 toc26 frequency (hz) thd (db) 10k 1k 100 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 10 100k 2v p-p output 4v p-p output total harmonic distortion vs. output amplitude max44241 toc27 output amplitude (v) thd (db) 9 8 7 6 5 4 3 2 1 -100 -80 -60 -40 -20 0 -120 0 10 crosstalk vs. frequency max44241 toc28 frequency (hz) crosstalk (db) 10k1k 1m 10 100 -120 -100 -80 -60 -40 -20 0 -160 -140 1 10m 100k total harmonic distortion vs. frequency max44241 toc29 frequency (hz) thd (db) 10k 1k 100 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 10 100k 2v p-p input v dd = 30v 4v p-p input emirr vs. frequency (v dd = 3.3v) MAX44246 toc30 frequency (mhz) emirr (db) 1000 100 10 1 10,000 10 20 30 40 50 60 70 80 90 100 0 maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
9 pin configurations inb- inb+ gnd 1 2 8 7 v dd outb ina- ina+ outa 3 4 6 5 MAX44246 max/so + ind+ v ss v dd 1 2 14 13 outd ind- ina- ina+ outa 3 4 12 11 inc- outc outb 5 10 inc+ inb+ inb- 6 7 9 8 + so max44243 max44241 sot-23 top view v ss ina+ 1outa 2 3 ina- 5 v dd 4 + 14 13 12 11 10 9 8 1 2 3 4 5 6 7 outd ind- ind+ v ss v dd ina+ ina- outa max44243 inc+ inc- outc outb inb- inb+ tssop + 1 2 3 4 8 7 6 5 n.c. v dd outa n.c. v ss ina+ ina- n.c. max + max44241 maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
10 pin descriptions pin name function max44241 max44243 MAX44246 sot23-5 max-8 so-14 tssop-14 so-8 max-8 1 6 1 1 1 1 outa channel a output 2 4 11 11 4 4 v ss negative supply voltage 3 3 3 3 3 3 ina+ channel a positive input 4 2 2 2 2 2 ina- channel a negative input 5 7 4 4 8 8 v dd positive supply voltage 5 5 5 5 inb+ channel b positive input 6 6 6 6 inb- channel b negative input 7 7 7 7 outb channel b output 8 8 outc channel c output 9 9 inc- channel c negative input 10 10 inc+ channel c positive input 12 12 ind+ channel d positive input 13 13 ind- channel d negative input 14 14 outd channel d output 1, 5, 8 n.c. no connection. not internally connected. maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
11 detailed description the max44241/max44243/MAX44246 are high-precision amplifiers that provide below 5v of maximum input- referred offset and low flicker noise. these characteris - tics are achieved by using a combination of proprietary auto-zeroing and chopper stabilized techniques. this combination of auto-zeroing and chopping ensures that these amplifiers give all the benefits of zero-drift ampli - fiers, while still ensuring low noise, minimizing chopper spikes, and providing wide bandwidth. offset voltages due to power ripple/spikes as well as common-mode variation, are corrected resulting in excellent psrr and cmrr specifications. noise suppression flicker noise, inherent in all active devices, is inverse - ly proportional to frequency present. charges at the oxide-silicon interface that are trapped-and-released by mosfet oxide occurs at low frequency more often. for this reason, flicker noise is also called 1/f noise. the max44241/max44243/MAX44246 eliminate the 1/f noise internally, thus making them ideal choices for dc or sub- hz precision applications. the 1/f noise appears as a slow varying offset voltage and is eliminated by the chop- ping technique used. electromagnetic interference (emi) noise occurs at higher frequency, resulting in malfunction or degradation of elec - trical equipment. the ics have an input emi filter to avoid the output being affected by radio frequency interference. the emi filter composed of passive devices, presents sig - nificant higher impedance to higher frequency. applications information adc buffer amplifier the max44241/max44243/MAX44246 have low input offset voltage, low noise, and fast settling time that make these amplifiers ideal for adc buffers. weight scales are one application that often requires a low-noise, high- voltage amplifier in front of an adc. the typical operating circuit details an example of a load cell and ampli - fier driven from the same 10v supplies, along with the max11211 18-bit delta sigma adc. load cells produce a very small voltage change at their outputs; therefore driv - ing the excitation source with a higher voltage produces a wider dynamic range that can be measured at the adc inputs. the max11211 adc operates from a single 2.7v to 3.6v analog supply, offers 18-bit noise-free resolution and 0.86mw power dissipation. the max11211 also offers > 100db rejection at 50hz and 60hz. this adc is part of a family of 16-, 18-, 20-, and 24-bit delta sigma adcs with high precision and < 1mw power dissipation. the low input offset voltage and low noise of max44241/ max44243/MAX44246 allow a gain circuit to precede the max11211 without losing any dynamic range at the adc. see the typical operating circuit . precision low-side current sensing the ics ultra-low offset voltage and drift make them ideal for precision current-sensing applications. figure 1 shows the ics in a low-side current-sense configuration. this circuit produces an accurate output voltage, v out equal to i load x r sense x (1 + r 2 /r 1 ). figure 1. low-side current sensing v supply out r2 r1 i load r sense ? ma x44246 maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
12 chip information process: bicmos package information for the latest package outline information and land patterns (foot - prints), go to www.maximintegrated.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 the package regardless of rohs status. layout guidelines the max44241/max44243/MAX44246 feature ultra-low offset voltage and noise. therefore, to get optimum per - formance follow the following layout guidelines. avoid temperature gradients at the junction of two dis - similar metals. the most common dissimilar metals used on a pcb are solder-to-component lead and solder-to- board trace. dissimilar metals create a local thermo - couple. a variation in temperature across the board can cause an additional offset due to seebeck effect at the solder junctions. to minimize the seebeck effect, place the amplifier away from potential heat sources on the board, if possible. orient the resistors such that both the ends are heated equally. it is a good practice to match the input signal path to ensure that the type and number of thermoelectric junctions remain the same. for example, consider using dummy 0 resistors oriented in such a way that the thermoelectric sources, due to the real resistors in the signal path, are cancelled. it is recommended to flood the pcb with ground plane. the ground plane ensures that heat is distributed uniformly reducing the potential offset voltage degradation due to seebeck effect. package type package code outline no. land pattern no. 5 sot23 u5+1 21-0057 90-0174 8 so s8+4 21-0041 90-0096 8 max u8+1 21-0036 90-0092 14 so s14m+4 21-0041 90-0112 14 tssop u14m+1 21-0066 90-0113 ordering information +denotes a lead(pb)-free/rohs-compliant package. part temp range pin- package top mark max44241aua+ -40nc to +125nc 8 fmax max44241auk+ -40nc to +125nc 5 sot23 afmr max44243asd+ -40nc to +125nc 14 so max44243aud+ -40nc to +125nc 14 tssop MAX44246asa+ -40nc to +125nc 8 so MAX44246aua+ -40nc to +125nc 8 fmax maxim integrated max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 13 ? 2014 maxim integrated the maxim logo and maxim integrated are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 7/12 initial release 1 9/12 revised the electrical characteristics and the typical operating characteristics . 1, 2, 3, 5 2 2/13 revised the typical operating characteristics. 8 3 5/13 updated general description, typical application circuit , and pin description. 1, 9 4 9/13 added the max44241/max44243 to the data sheet. revised the typical operating circuit. 1C13 5 1/14 revised electrical characteristics and the typical operating characteristics . 2, 5 max44241/max44243/MAX44246 36v, low-noise, precision, single/quad/dual op amps

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