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19-6375; rev 3; 5/13 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 max44246 is a 36v, ultra-precision, low-noise, low- drift, dual operational amplifier that offers near-zero dc offset and drift through the use of patented chopper stabilized and auto-zeroing techniques. this method constantly measures and compensates the input offset, eliminating drift over time and temperature and the effect of 1/f noise. this dual device features rail-to-rail outputs, operates from a single 2.7v to 36v supply or dual 1.35v to 18v supplies, and consumes only 0.42ma per chan - nel, with only 9nv/ hz input-referred voltage noise. the ic is unity-gain stable with a gain-bandwidth product of 5mhz. with excellent specifications such as offset voltage of 5 f v (max), drift of 20nv/ n c (max), and 117nv p-p noise in 0.1hz to 10hz, the ic is 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 ic is available in 8-pin f max m or so packages and is rated over the -40 n c to +125 n c 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 max44246 max44246 max11211 max6126 r r 15v 1.5v buffer r r r 1 output max44246 -15v -15v -15v max44246 36v, low-noise, precision, dual op amp 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 ................................................. q 20ma differential input voltage (note 1) ....................................... . q 6v continuous power dissipation (t a = +70 n c) 8-pin f max (derate 4.8mw/c above +70 n c) ......... 387.8mw 8-pin so (derate 4.8mw/c above +70 n c) .............. 470.6mw operating temperature range ........................ -40 n c to +125 n c junction temperature .................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering,10s) ................................. +300 n c soldering temperature (reflow) ...................................... +260 n c 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 ) ........ 221 n c/w junction-to-case thermal resistance ( q jc ) .............. 42 n c/w so junction-to-ambient thermal resistance ( q ja ) ........ 120 n c/w junction-to-case thermal resistance ( q jc ) .............. 37 n c/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 = +25 n c 148 166 db v dd = 2.7v to 36v, -40 n c < t a < +125 n c 146 quiescent current per amplifier i dd r l = j t a = +25 n c 0.42 0.55 ma -40 n c < t a < +125 n c 0.60 power-up time t on 20 f s 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 input offset voltage drift (note 4) tc v os 1 20 nv/ n c input bias current (note 4) i b t a = +25 n c 300 600 pa -40 n c < t a < +125 n c 1250 maxim integrated max44246 36v, low-noise, precision, dual op amp
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 current (note 4) i os t a = +25 n c 600 1200 pa -40 n c < t a < +125 n 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 = +25 n c 90 115 mv -40 n c < t a < +125 n c 180 output voltage high v oh t a = +25 n c (v dd - 0.17) (v dd - 0.13) v -40 n c < t a < +125 n 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/ f s 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 = +25 n c 0.42 0.55 ma -40 n c < t a < +125 n c 0.60 power-up time t on 20 f s dc specifications input common-mode range v cm guaranteed by cmrr test (gnd - 0.05) (v dd C 1.5) v maxim integrated max44246 36v, low-noise, precision, dual op amp
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 common-mode rejection ratio (note 4) cmrr t a = +25 n c , v cm = (v gnd - 0.05v) to (v dd - 1.5v) 142 158 db -40 n c < t a < +125 n c, v cm = (v gnd - 0.05v) to (v dd - 1.5v) 140 input offset voltage (note 4) v os 1 5 f v input offset voltage drift (note 4) tc v os 2.4 20 nv/ n c input bias current (note 4) i b t a = +25 n c 300 600 pa -40 n c < t a < +125 n c 1100 input offset current (note 4) i os t a = +25 n c 600 1200 pa -40 n c < t a < +125 n 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 = +25 n c 30 40 mv -40 n c < t a < +125 n c 60 output voltage high v oh t a = +25 n c (v dd - 0.06) (v dd - 0.05) v -40 n c < t a < +125 n 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 max44246 36v, low-noise, precision, dual op amp
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 max44246 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 max44246 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 max44246 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 max44246 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 max44246 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 max44246 toc05 v cm (v) input offset voltage (v) 8 7 6 5 4 3 2 1 -2 -1 0 1 2 3 -3 09 -800 -600 -400 -200 200 400 600 800 0 input bias current vs. temperature max44246 toc08 input bias current (pa) 1000 -1000 temperature (c) 100 75 50 25 0 -25 -50 125 ib+ ib- input offset voltage vs. temperature max44246 toc06 input offset voltage (v) 5 -5 temperature (c) 100 75 50 25 0 -25 -50 125 0 90 100 110 120 140 150 160 170 130 common-mode rejection ratio vs. temperature max44246 toc09 cmrr (db) 180 80 temperature (c) 100 75 50 25 0 -25 -50 125 maxim integrated max44246 36v, low-noise, precision, dual op amp
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 max44246 toc10 frequency (hz) magnitude (db) 1m 100k 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 max44246 toc11 psrr (db) 180 80 temperature (c) 100 75 50 25 0 -25 -50 125 open-loop gain vs. frequency max44246 toc12 frequency (hz) magnitude (db) 1m 100k 1k 10k 10 100 1 0.01 0.1 10m 100m 200 -50 0 50 100 150 v in = 100mv p-p output voltage low vs. temperature max44246 toc15 v ol (mv) 70 0 temperature (c) 100 75 50 25 0 -25 -50 125 10 20 30 40 50 60 output voltage low vs. output sink current max44246 toc13 output sink current (ma) output voltage high (mv) 8 6 4 2 01 0 50 100 150 200 300 350 400 450 250 500 0 output voltage high vs. temperature max44246 toc16 output voltage high (v) 9.970 9.930 temperature (c) 100 75 50 25 0 -25 -50 125 9.940 9.935 9.945 9.955 9.950 9.965 9.960 output voltage high vs. output sink current max44246 toc14 output sink current (ma) output voltage high (mv) 8 6 4 2 01 0 9.60 9.55 9.65 9.70 9.75 9.85 9.90 9.95 10.00 9.80 10.05 9.50 small-signal gain vs. frequency max44246 toc17 frequency (hz) magnitude (db) 1m 100k 1k 10k 100 2 -20 10 100m 10m -18 -16 -14 -12 -10 -8 -6 -4 -2 0 normalized gain, v in = 100mv p-p large-signal gain vs. frequency max44246 toc18 frequency (hz) magnitude (db) 10m 1m 10k 100k 1k 100 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 5 -50 10 100m normalized gain, v in = 2v p-p maxim integrated max44246 36v, low-noise, precision, dual op amp
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 max44246 toc20 1s / div 200nv/div small-signal (100mv p-p) step response vs. time max44246 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 max44246 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 max44246 toc22 1s / div v in 1v/div v out 1v/div stability vs. capacitive load and series isolation resistance max44246 toc23 capacitive load (pf) r iso ( i ) 1k 10k 1 10 100 0.1 100 100k unstable stable input voltage noise vs. frequency max44246 toc19 frequency (hz) input voltage noise (nv/hz) 10k 1k 100 10 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 0 1 100k maxim integrated max44246 36v, low-noise, precision, dual op amp
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 max44246 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 max44246 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 max44246 toc28 frequency (hz) crosstalk (db) 10k 1k 1m 10 100 -120 -100 -80 -60 -40 -20 0 -160 -140 1 10m 100k total harmonic distortion vs. frequency max44246 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 max44246 36v, low-noise, precision, dual op amp
9 pin description detailed description the max44246 is a high-precision amplifier that provides below 5v of maximum input-referred offset and low flicker noise. these characteristics 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 amplifiers, 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 max44246 eliminates the 1/f noise internally, thus making it an ideal choice for dc or sub-hz precision applications. the 1/f noise appears as a slow varying offset voltage and is eliminated by the chopping 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 max44246 has low input offset voltage, low noise, and fast settling time that make this amplifier 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 amplifier 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 driving the excitation source with a higher voltage produces a wider dynamic range that can be measured at the adc inputs. pin configuration pin name function 1 outa channel-a output 2 ina- channel-a negative input 3 ina+ channel-a positive input 4 gnd negative supply voltage 5 inb+ channel-b positive input 6 inb- channel-b negative input 7 outb channel-b output 8 v dd positive supply voltage inb- inb+ gnd 1 2 8 7 v dd outb ina- ina+ outa top view 3 4 6 5 max44246 max/so + maxim integrated max44246 36v, low-noise, precision, dual op amp
10 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 max44246 allows 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 ). layout guidelines the max44246 features ultra-low offset voltage and noise. therefore, to get optimum performance 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. figure 1. low-side current sensing v supply out r2 r1 i load r sense max44246 maxim integrated max44246 36v, low-noise, precision, dual op amp
11 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. ordering information + denotes a lead(pb)-free/rohs-compliant package. package type package code outline no. land pattern no. 8 max u8+3 21-0036 90-0092 8 so s8+4 21-0041 90-0096 part temp range pin-package MAX44246ASA+ -40 n c to +125 n c 8 so max44246aua+ -40 n c to +125 n c 8 f max maxim integrated max44246 36v, low-noise, precision, dual op amp
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 12 ? 2013 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 max44246 36v, low-noise, precision, dual op amp

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