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typical operating circuit 19-6367; rev 2; 9/13 general description the MAX44244/max44245/max44248 family of parts provide ultra-precision, low-noise, zero-drift single/quad/ dual operational amplifiers featuring very low-power operation with a wide supply range. the devices incor - porate a patented auto-zero circuit that constantly mea - sures and compensates the input offset to eliminate drift over time and temperature as well as the effect of 1/f noise. these devices also feature integrated emi filters to reduce high-frequency signal demodulation on the output. the op amps operate from either a single 2.7v to 36v supply or dual 1.35v to 18v supply. the devices are unity-gain stable with a 1mhz gain-bandwidth prod - uct and a low 90a supply current per amplifier. the low offset and noise specifications and high supply range make the devices ideal for sensor interfaces and transmitters. the devices are available in fmaxm, so, sot23, and tssop packages and are specified over the -40nc to +125nc automotive operating temperature range. applications sensors interfaces 4-20ma and 0 to10v transmitters plc analog i/o modules weight scales portable medical devices features s very low input voltage offset 7.5v (max) s low 30nv/nc offset drift (max) s low 90a quiescent current per amplifier s low input noise 50nv/hz at 1khz 0.5v p-p from 0.1hz to 10hz s 1mhz gain-bandwidth product s emi suppression circuitry s rail-to-rail output s 2.7v to 36v supply range s max, so, sot23, tssop packages ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX44244.related. max is a registered trademark of maxim integrated products, inc. max5216 dac max6033 ref r1 r sense r3 r2 v ref lp+ lp- i sig (4-20ma) MAX44244 MAX44244/max44245/max44248 36v, precision, low-power, 90a, 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 absolute maximum ratings 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. package thermal characteristics (note 1) v dd to v ss ............................................................ -0.3v to +40v common-mode input voltage ........ (v ss - 0.3v) to (v dd + 0.3v) differential input voltage in_+, in_- ...................................... 6v continuous input current into any pin ........................... q20ma output voltage to v ss (out_) ................ C 0.3v to (v dd + 0.3v) output short-circuit duration (out_) ..................................... 1s operating temperature range ........................ -40nc to +125nc storage temperature ....................................... -65nc to +150nc junction temperature ..................................................... +150nc lead temperature (soldering, 10s) ................................ +300nc soldering temperature (reflow) ...................................... +260nc note 1: 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. electrical characteristics (v dd = 10v, v ss = 0v, v in+ = v in- = v dd /2, r l = 5ki to v dd /2, t a = -40nc to +125nc, unless otherwise noted. typical values are at +25nc.) (note 2) so-8 junction-to-ambient thermal resistance ( b ja ) ........ 132nc/w junction-to-case thermal resistance ( b jc ) ............... 38nc/w so-14 junction-to-ambient thermal resistance ( b ja ) ........ 120nc/w junction-to-case thermal resistance ( b jc ) ............... 37nc/w sot23 junction-to-ambient thermal resistance ( b ja ) ..... 324.3nc/w junction-to-case thermal resistance ( b jc ) ............... 82nc/w tssop junction-to-ambient thermal resistance ( b ja ) ........ 110nc/w junction-to-case thermal resistance ( b jc ) ............... 30nc/w fmax junction-to-ambient thermal resistance ( b ja ) ..... 206.3nc/w junction-to-case thermal resistance ( b jc ) ............... 42nc/w parameter symbol conditions min typ max units power supply supply voltage range v dd guaranteed by psrr 2.7 36 v power-supply rejection ratio (note 3) psrr t a = +25nc, v in+ = v in- = v dd /2 - 1v 140 148 db -40nc < t a < +125nc 133 quiescent current per amplifier (max4244 only) i dd t a = +25nc 100 160 fa -40nc < t a < +125nc 190 quiescent current per amplifier (max44245/max44248 only) i dd t a = +25nc 90 130 fa -40nc < t a < +125nc 145 dc specifications input common-mode range v cm guaranteed by cmrr test v ss - 0.05 v dd - 1.5 v maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
3 electrical characteristics (continued) (v dd = 10v, v ss = 0v, v in+ = v in- = v dd /2, r l = 5ki to v dd /2, t a = -40nc to +125nc, unless otherwise noted. typical values are at +25nc.) (note 2) parameter symbol conditions min typ max units common-mode rejection ratio (note 3) cmrr t a = +25nc, v cm = v ss - 0.05v to v dd - 1.5v 126 130 db -40nc < t a < +125nc, v cm = v ss - 0.05v to v dd - 1.5v 120 input offset voltage (note 3) v os t a = +25nc 2 7.5 fv -40nc < t a < +125nc 10 input offset voltage drift (note 3) tc v os 10 30 nv/nc input bias current (note 3) i b t a = +25nc 150 300 pa -40nc < t a < +125nc 700 input offset current (note 3) i os t a = +25nc 300 600 pa -40nc < t a < +125nc 1400 open-loop gain (note 3) a vol v ss + 0.5v p v out p v dd - 0.5v t a = +25nc 140 150 db -40nc < t a < +125nc 135 output short-circuit current to v dd or v ss , noncontinuous 40 ma output voltage swing v dd - v out t a = +25nc 80 mv -40nc < t a < +125nc 110 v out - v ss t a = +25nc 50 -40nc < t a < +125nc 75 ac specifications input voltage-noise density e n f = 1khz 50 nv/ hz input voltage noise 0.1hz < f < 10hz 500 nv p-p input current-noise density i n f = 1khz 0.1 pa/ hz gain-bandwidth product gbw 1 mhz slew rate sr a v = 1v/v, v out = 2v p-p 0.7 v/fs capacitive loading c l no sustained oscillation, a v = 1v/v 400 pf total harmonic distortion plus noise thd+n v out = 2v p-p , a v = +1v/v, f = 1khz -100 db emi rejection ratio emirr v rf_peak = 100mv f = 400mhz 75 db f = 900mhz 78 f = 1800mhz 80 f = 2400mhz 90 maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
4 electrical characteristics (v dd = 30v, v ss = 0v, v in+ = v in- = v dd /2, r l = 5ki to v dd /2, t a = -40nc to +125nc, unless otherwise noted. typical values are at +25nc.) (note 2) parameter symbol conditions min typ max units power supply quiescent current per amplifier (MAX44244 only) i dd t a = +25nc 100 160 fa -40nc < t a < +125nc 190 quiescent current per amplifier (max44245/max44248 only) i dd t a = +25nc 90 130 fa -40nc < t a < +125nc 145 dc specifications input common-mode range v cm guaranteed by cmrr test v ss - 0.05 v dd - 1.5 v common-mode rejection ratio (note 3) cmrr t a = +25nc, v cm = v ss - 0.05v to v dd - 1.5v 130 140 db -40n c < t a < +125n c, v cm = v ss - 0.05v to v dd - 1.5v 126 input offset voltage (note 3) v os t a = +25nc 2 7.5 fv -40nc < t a < +125nc 10 input offset voltage drift (note 3) tc v os 10 30 nv/c input bias current (note 3) i b t a = +25nc 150 300 pa -40nc < t a < +125nc 700 input offset current (note 3) i os t a = +25nc 300 600 pa -40nc < t a < +125nc 1400 open-loop gain (note 3) a vol v ss + 0.5v p v out p v dd - 0.5v t a = +25nc 146 150 db -40n c < t a < +125n c 140 output short-circuit current to v dd or v ss , noncontinuous 40 ma output voltage swing v dd - v out t a = +25nc 200 mv -40nc < t a < +125nc 270 v out - v ss t a = +25nc 140 -40nc < t a < +125nc 220 ac specifications input voltage-noise density e n f = 1khz 50 nv/hz input voltage noise 0.1hz < f < 10hz 500 nv p-p input current-noise density i n f = 1khz 0.1 pa/hz gain-bandwidth product gbw 1 mhz maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
5 typical operating characteristics (t a = +25c, unless otherwise noted.) electrical characteristics (continued) (v dd = 30v, v ss = 0v, v in+ = v in- = v dd /2, r l = 5ki to v dd /2, t a = -40nc to +125nc, unless otherwise noted. typical values are at +25nc.) (note 2) note 2: all devices are 100% production tested at t a = +25nc. temperature limits are guaranteed by design. note 3: guaranteed by design. note 4: at in+ and in-. defined as 20log (v rf_peak /v os ). typical operating characteristics (v dd = 10v, v ss = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2. typical values are at t a = +25c.) parameter symbol conditions min typ max units slew rate sr a v = 1v/v, v out = 2v p-p 0.7 v/fs capacitive loading c l no sustained oscillation, a v = 1v/v 400 pf total harmonic distortion plus noise thd+n v out = 2v p-p , a v = +1v/v, f = 1khz -100 db emi rejection ratio emirr v rf_peak = 100mv f = 400mhz 75 db f = 900mhz 78 f = 1800mhz 80 f = 2400mhz 90 input offset voltage histogram max44248 toc01 input offset voltage (v) occurance (%) 3.0 2.5 1.51.0 2.0 0.5 0 5 10 15 20 25 30 35 40 45 0 3.5 input offset voltage drift max44248 toc02 input offset voltage drift (nv/c) occurance (%) 14 13 12 11 10 9 8 7 6 5 5 10 15 20 25 30 35 0 4 supply current vs. supply voltage max44248 toc03 supply voltage (v) supply current (a) 30 20 10 82 84 86 88 90 92 94 96 98 100 80 04 0 maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
6 typical operating characteristics (continued) (v dd = 10v, v ss = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2. typical values are at t a = +25c.) supply current vs. temperature max44248 toc04 temperature (c) supply current (a) 100 75 25 50 0 -25 82 84 86 88 90 92 94 96 98 100 80 -50 125 input offset voltage vs. common-mode voltage max44248 toc05 common-mode voltage (v) offset voltage (v) 24 0-2-4 -3 -2 -1 0 1 2 -4 -6 6 input offset voltage vs . temperature max44248 toc06 temperature (c) offset voltage (v) 100 75 -25 0 25 50 -4 -3 -2 -1 0 1 2 3 -5 -50 125 input bias current vs . common-mode voltage max44248 toc07 common-mode voltage (v) input bias current (pa) 8 6 4 2 20 40 60 80 100 120 140 160 180 0 01 0 common-mode rejection ratio vs. frequency max44248 toc09 frequency (hz) cmrr (db) 100k 10k1k100 -120 -100 -80 -60 -40 -20 0 -140 10 1m input bias current vs. temperature max44248 toc08 temperature (c) input bias current (pa) 100 75 50 25 0 -25 -200 0 200 400 600 800 -400 -50 125 common-mode rejection ratio vs. temperature max44248 toc10 temperature (c) cmrr (db) 100 75 50 25 0 -25 -130 -125 -120 -115 -110 -105 -100 -135 -50 125 maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
7 power-supply rejection ratio vs. frequency max44248 toc11 frequency (hz) psrr (db) 100k 10k 100 1k -140 -120 -100 -80 -60 -40 -20 0 -160 10 1m output voltage high vs. temperature max44248 toc12 temperature (c) v dd - v out (mv) 100 75 25 50 0 -25 10 20 30 40 50 60 70 80 0 -50 125 output voltage low vs. temperature max44248 toc13 temperature (c) v out - v ss (mv) 100 75 50 25 0 -25 10 20 30 40 50 60 0 -50 125 output voltage high vs. source current max44248 toc14 source current (ma) v dd - v out (mv) 1 10 100 1000 1 0.1 10 input voltage noise vs. frequency max44248 toc16 frequency (hz) input voltage noise (nv/hz) 10k 1k 100 20 40 60 80 100 120 140 160 180 200 0 10 100k output voltage low vs. sink current max44248 toc15 sink current (ma) v out - v ss (mv) 1 10 100 1000 1 0.1 10 input voltage 0.1hz to 10hz noise max44248 toc17 400nv/div 1s/div typical operating characteristics (continued) (v dd 10v, v ss 0v, v in v in- v dd 2, r l 5k to v dd 2 typical values are at t a 25c) maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
8 typical operating characteristics (continued) (v dd = 10v, v ss = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2. typical values are at t a = +25c.) input current noise vs. frequency max44248 toc18 frequency (hz) input-current noise (pa/ hz) 10k 1k 100 1 2 3 4 5 6 7 8 9 10 0 10 100k large-signal gain vs. frequency max44248 toc20 frequency (hz) large-signal gain (db) 100k10k 100 1k 101 -20 0 20 40 60 80 100 120 140 -40 0.1 1m small-signal gain vs. frequency max44248 toc19 frequency (hz) small-signal gain (db) 100k10k 100 1k 101 -20 0 20 40 60 80 100 120 140 -40 0.1 1m power-up time max44248 toc23 v out 2v/div v dd 10v/div 20s/div total harmonic distortion vs. frequency max44248 toc24 frequency (hz) thd (db) 10k 1k 100 -120 -100 -80 -60 -40 -20 0 -140 10 100k r load = 600i r load = 1ki r load = 5ki large-signal step response max44248 toc22 v out 500mv/div v in 2v/div 4s/div small-signal step response max44248 toc21 v out 50mv/div v in 100mv/div 4s/div maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
9 typical operating characteristics (continued) (v dd = 10v, v ss = 0v, v in+ = v in- = v dd /2, r l = 5k to v dd /2. typical values are at t a = +25c.) output stability vs. capacitive load max44248 toc25 capacitive load (pf) resistive load (i) 10,000 1000 10 100 1k 10k 1 100 100,000 unstable stable output stability vs. isolation resistance max44248 toc26 capacitive load (pf) isolation resistance (i) 10,000 1000 10 100 1k 10k 1 100 100,000 unstable stable crosstalk vs. frequency max44248 toc27 frequency (hz) crosstalk (db) 100k 10k 1k -120 -100 -80 -60 -40 -20 0 -140 100 1m output impedance vs. frequency max44248 toc28 frequency (hz) output impedance ( i ) 100k 10k 1k 10 20 30 40 50 60 70 80 90 100 0 100 1m emirr vs. frequency max44248 toc29 frequency (mhz) emirr (db) 1,000 100 20 40 60 80 100 120 0 10 10,000 maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
10 pin configurations outa + ina- ina+ 1 2 3 4 8 7 6 5 v ss v dd outb inb- inb+ so-8 max44248 1 2 3 4 8 7 6 5 v dd outb inb- inb+ v ss ina+ ina- outa max + max44248 MAX44244 sot23 top view v ss ina+ 1outa 2 3 ina- 5v dd 4 + 1 2 3 4 8 7 6 5 n.c. v dd outa n.c. v ss ina+ ina- n.c. max + MAX44244 14 13 12 11 10 9 8 1 2 3 4 5 6 7 outd ind- ind+ v ss v dd ina+ ina- outa max44245 inc+ inc- outc outb inb- inb+ tssop + ind+ v ss v dd 1 2 14 13 outd ind- ina- ina+ outa 3 4 12 11 inc- outc outb 51 0 inc+ inb+ inb- 6 7 9 8 + so-14 max44245 maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
11 pin description detailed description the MAX44244/max44245/max44248 are high-precision amplifiers with less than 2 f v (typ) input-referred offset and low input voltage-noise density at 10hz. 1/f noise, in fact, is eliminated to improve the performance in low-frequency applications. these characteristics are achieved through an auto-zeroing technique that cancels the input offset voltage and 1/f noise of the amplifier. external noise suppression in emi form these devices have input emi filters to prevent effects of radio frequency interference on the output. the emi filters comprise passive devices that present significant higher impedance to higher frequency signals. see the emirr vs. frequency graph in the typical operating characteristics section for details. high supply voltage range the devices feature 90a current consumption per chan - nel and a voltage supply range from either 2.7v to 36v single supply or 1.35v to 18v split supply. applications information the devices feature ultra-high precision operational amplifiers with a high supply voltage range designed for load cell, medical instrumentation, and precision instrument applications. 4C20ma current-loop communication industrial environments typically have a large amount of broadcast electromagnetic interference (emi) from high- voltage transients and switching motors. this combined with long cables for sensor communication leads to high-voltage noise on communication lines. current-loop communication is resistant to this noise because the emi induced current is low. this configuration also allows for low-power sensor applications to be powered from the communication lines. the typical operating circuit shows how the device can be used to make a current loop driver. the circuit uses low-power components such as the MAX44244 op amp, the 16-bit max5216 dac, and the high-precision 60a-only max6033 reference. in this pin name function MAX44244 max44245 max44248 sot23 max so-14 tssop so-8 max 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 MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
12 circuit, both the dac and the reference are referred to the local ground. the MAX44244 op-amp inputs are capable of swinging to the negative supply (which is the local ground in this case). r3 acts as a current mirror with r sense . therefore, if r sense = 50 (i.e. 20ma will drop 1v) and if the current through r3 is 10 a when i out is 20ma (0.05% error) then r3 = 100k. r1 is chosen along with the reference voltage to provide the 4ma offset. r2 = 512k for 20ma full scale or r2 = 614k for 20% over- range. r sense is ratiometric with r3, r1 independently sets the offset current and r2 independently sets the dac scaling. driving high-performance adcs the MAX44244/max44245/max44248s low input offset voltage and low noise make these amplifiers ideal for adc buffering. weight scale applications require a low- noise, precision amplifier in front of an adc. figure 1 details an example of a load cell and amplifier driven from the same 5v supply, along with a 16-bit delta sigma adc such as the max11205. the max11205 is an ultra-low-power (< 300 f a, max active current), high-resolution, serial output adc. it provides the highest resolution per unit power in the industry and is optimized for applications that require very high dynamic range with low power such as sensors on a 4C20ma industrial control loop. the devices provide a high-accuracy internal oscillator that requires no external components. layout guidelines the MAX44244/max44245/max44248 feature ultra-low input offset voltage and noise. therefore, to get optimum performance follow the layout guidelines. avoid temperature tradients at the junction of two dissimilar 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 thermocouple. 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 juntions remain the same. for example, consider using dummy 0 resistors oriented in such a way that the thermoelectric source, 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. weight application 5v 5v v dd micro controller output r f r f r g v dd v ss v in- v in+ amp a amp b max11205 ? max44248 ? ma x44248 5v maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps
13 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. part temp range pin- package top mark MAX44244auk+ -40c to +125c 5 sot23 afmr MAX44244aua+ -40c to +125c 8 max max44245asd+ -40c to +125c 14 so max44245aud+ -40c to +125c 14 tssop max44248aua+ -40c to +125c 8 max max44248asa+ -40c to +125c 8 so package type package code outline no. land pat- tern 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 maxim integrated MAX44244/max44245/max44248 36v, precision, low-power, 90a, 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 14 ? 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 6/13 added the MAX44244/max44245 to data sheet. updated the electrical characteristics, absolute maximum ratings, pin description, and pin configurations. 1C13 2 9/13 released the MAX44244 for introduction. revised the electrical characteristics 2C5, 13 MAX44244/max44245/max44248 36v, precision, low-power, 90a, single/quad/dual op amps

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