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MAX44251/max44252 20v, ultra-precision, low-noise op amps ????????????????????????????????????????????????????????????????? maxim integrated products 1 typical operating circuit 19-6000; rev 0; 10/11 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX44251.related . max is a registered trademark of maxim integrated products, inc. functional diagrams appear at end of data sheet. general description the MAX44251/max44252 are 20v, ultra-precision, low- noise, low-drift amplifiers that offer near-zero dc offset and drift through the use of patented autocorrelating zeroing techniques. this method constantly measures and compensates the input offset, eliminating drift over time and temperature and the effect of 1/f noise. these dual and quad devices feature rail-to-rail outputs, oper - ate from a single 2.7v to 20v supply, and consume only 1.15ma per channel, while providing 5.9nv/ hz input- referred voltage noise. the ics are unity-gain stable with a gain-bandwidth product of 10mhz. with excellent specifications such as offset voltage of 6v (max), drift of 19nv/c (max), and 123nv p-p noise in 0.1hz to 10hz, the ics are ideally suited for applications requiring ultra-low noise and dc precision such as inter - facing with pressure sensors, strain gauges, precision weight scales, and medical instrumentation. the ics are available in 8-pin sot23, 8-pin max m , and 14-pin soic packages and are rated over the -40c to +125c temperature range. benefits and features s 2.7v to 20v power-supply range s integrated emi filter s 6v input offset voltage (max) at room temperature s tcv os of 19nv/ c (max) s low 5.9nv/ hz input-referred voltage noise s 123nv p-p in 0.1hz to 10hz s fast 400ns settling time s 10mhz gain-bandwidth product s rail-to-rail output s high accuracy enables precision signal chain acquisition applications strain gauges pressure transducers medical instrumentation precision instrumentation load cell and bridge transducer amplification 20v 20v 20v 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 MAX44251 MAX44251 max11211 max6126 MAX44251 r r 20v 1.5v buffer r r r 1 output for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. www.datasheet.co.kr datasheet pdf - http://www..net/
????????????????????????????????????????????????????????????????? maxim integrated products 2 MAX44251/max44252 20v, ultra-precision, low-noise op amps supply voltage (v dd to v ss ) ................................. -0.3v to +22v all other pins .................................. (v ss - 0.3v) to (v dd + 0.3v) short-circuit duration to either supply rail ............................ 1s continuous input current (any pin) ................................. 20ma differential input voltage ...................................................... 6v maximum power dissipation (t a = +70c) sot23 (derate 9.1 mw/c above +70c) ................... 727mw max (derate 4.5 mw/c above +70c) .................... 362mw soic (derate 8.3 mw/c above +70c) .................. 666.7mw operating temperature range ........................ -40c to +125 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65c to +150 n c lead temperature (soldering, 10s) .............................. +300 n c soldering temperature (reflow) .................................... +260 n c sot23 junction-to-ambient thermal resistance ( ja ) ....... 196c/w junction-to-case thermal resistance ( jc ) ............... 70c/w max junction-to-ambient thermal resistance ( ja ) ........ 221c/w junction-to-case thermal resistance ( jc ) ............... 42c/w soic junction-to-ambient thermal resistance ( ja ) ........ 120c/w junction-to-case thermal resistance ( jc ) ............... 37c/w absolute maximum ratings 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.maxim-ic.com/thermal-tutorial . 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) electrical characteristics ( v dd = 10v , v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at +25c.) (note 2) parameter symbol conditions min typ max units power supply supply voltage range v dd guaranteed by psrr 2.7 20 v power-supply rejection ratio (note 3) psrr v dd = 2.7v to 20v, v cm = 0v 140 145 db quiescent current per amplifier i dd r l = j t a = +25 n c 1.15 1.55 ma -40 n c < t a < +125 n c 1.75 power-up time t on 25 f s 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 = +25 n c, v cm = -0.05v to (v dd - 1.5v) 133 140 db -40 n c < t a < +125 n c 130 www.datasheet.co.kr datasheet pdf - http://www..net/
????????????????????????????????????????????????????????????????? maxim integrated products 3 MAX44251/max44252 20v, ultra-precision, low-noise op amps electrical characteristics (continued) ( v dd = 10v , v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at +25c.) (note 2) parameter symbol conditions min typ max units input offset voltage (note 3) v os t a = +25 n c 3 6 f v -40 n c < t a < +125 n c 7 input offset voltage drift (note 3) tc v os 5 19 nv/ n c input bias current (note 3) i b t a = +25 n c 200 1300 pa -40 n c < t a < +125 n c 2400 input offset current (note 3) i os 400 pa open-loop gain (note 3) a vol 250mv p v out p v dd - 250mv, r l = 10k i to v dd /2 t a = +25 n c 145 154 db -40 n c < t a < +125 n c 136 output short-circuit current to v dd or v ss noncontinuous 96 ma output voltage low v ol v out - v ss r l = 10k i to v dd /2 12 25 mv r l = 2k i to v dd /2 45 85 output voltage high v oh v dd - v out r l = 10k i to v dd /2 18 37 mv r l = 2k i to v dd /2 71 135 ac specifications input voltage-noise density e n f = 1khz 5.9 nv/ hz input voltage noise 0.1hz < f < 10hz 123 nv p-p input current-noise density i n f = 1khz 0.6 pa/ hz input capacitance c in 2 pf gain-bandwidth product gbw 10 mhz phase margin pm c l = 20pf 60 degrees slew rate sr a v = 1v/v, v out = 2v p-p 8 v/ f s capacitive loading c l no sustained oscillation, a v = 1v/v 500 pf total harmonic distortion thd v out = 2v p-p , a v = +1v/v, r l = 10k i to v dd /2 f = 1khz -124 db f = 20khz -119 settling time to 0.01%, v out = 2v step, a v = -1v/v 400 ns www.datasheet.co.kr datasheet pdf - http://www..net/
????????????????????????????????????????????????????????????????? maxim integrated products 4 MAX44251/max44252 20v, ultra-precision, low-noise op amps electrical characteristics ( v dd = 3.3v , v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at +25c.) (note 2) parameter symbol conditions min typ max units power supply quiescent current per amplifier i dd r l = j t a = +25 n c 1.1 1.5 ma -40 n c < t a < +125 n c 1.65 power-up time t on 25 f s 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 = +25 n c, v cm = -0.05v to (v dd - 1.5v) 120 129 db -40 n c < t a < +125 n c 117 input offset voltage (note 3) v os t a = +25 n c 3 5.5 f v -40 n c < t a < +125 n c 6.5 input offset voltage drift (note 3) tc v os 8 18 nv/ n c input bias current (note 3) i b t a = +25 n c 200 1100 pa -40 n c < t a < +125 n c 1200 input offset current (note 3) i os 400 pa open-loop gain (note 3) a vol 250mv p v out p v dd - 250mv, r l = 10k i to v dd /2 t a = +25 n c 136 151 db -40 n c < t a < +125 n c 133 output short-circuit current to v dd or v ss noncontinuous 58 ma output voltage low v ol v out - v ss r l = 10k i to v dd /2 5 22 mv r l = 2k i to v dd /2 17 42 output voltage high v oh v dd - v out r l = 10k i to v dd /2 9 22 mv r l = 2k i to v dd /2 29 52 ac specifications input voltage-noise density e n f = 1khz 6.2 nv/ hz input voltage noise 0.1hz < f < 10hz 123 nv p-p input current-noise density i n f = 1khz 0.3 pa/ hz input capacitance c in 2 pf gain-bandwidth product gbw 10 mhz www.datasheet.co.kr datasheet pdf - http://www..net/
????????????????????????????????????????????????????????????????? maxim integrated products 5 MAX44251/max44252 20v, ultra-precision, low-noise op amps electrical characteristics (continued) ( v dd = 3.3v , v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, t a = -40c to +125c, unless otherwise noted. typical values are at +25c.) (note 2) typical operating characteristics (v dd = 10v, v ss = 0v, outputs have r l = 10k i to v dd /2. t a = +25 n c, unless otherwise specified.) note 2: all devices are 100% production tested at t a = +25c. temperature limits are guaranteed by design. note 3: guaranteed by design. parameter symbol conditions min typ max units phase margin pm c l = 20pf 60 degrees slew rate sr a v = 1v/v, v out = 1v p-p , 10% to 90% 5 v/ f s capacitive loading c l no sustained oscillation, a v = 1v/v 500 pf total harmonic distortion thd v out = 1v p-p , a v = +1v/v, v cm = v dd /4, r l = 10k i to v dd /2 f = 1khz -124 db f = 20khz -100 settling time to 0.01%, v out = 1v step, a v = -1v/v 200 ns offset voltage histogram MAX44251 toc01 offset voltage (v) frequency (%) 5 10 15 20 25 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 input offset voltage drift histogram MAX44251 toc02 frequency (%) 2 4 6 8 10 12 14 16 0 -0.001 0 0.001 0.002 0.003 0.004 0.005 0.006 offset voltage drift (v/c) supply current vs. supply voltage MAX44251 toc03 supply voltage (v) supply current (ma) 20 15 10 5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 02 5 t a = +85c t a = +25c t a = 0c t a = -40c supply current per amplifier t a = +125c www.datasheet.co.kr datasheet pdf - http://www..net/
????????????????????????????????????????????????????????????????? maxim integrated products 6 MAX44251/max44252 20v, ultra-precision, low-noise op amps typical operating characteristics (continued) (v dd = 10v, v ss = 0v, outputs have r l = 10k i to v dd /2. t a = +25 n c, unless otherwise specified.) supply current vs. temperature MAX44251 toc04 temperature (c) supply current (ma) 125 100 50 75 0 25 -25 1.08 1.10 1.12 1.14 1.16 1.18 1.20 1.22 1.24 1.26 1.28 1.06 -50 150 supply current per amplifier input offset voltage vs. input common mode MAX44251 toc05 input common voltage (v) v os (v) 8 6 4 2 1 2 3 4 5 6 0 01 0 input offset voltage vs. temperature MAX44251 toc06 v os (v) 1 2 3 4 5 6 0 temperature (c) 100 50 75 02 5 -25 -50 125 input bias current vs. input common-mode voltage MAX44251 toc07 v cm (v) 8 6 4 2 01 0 i bias (pa) -200 -150 -100 -50 0 50 100 150 200 250 -250 negative i bias positive i bias input bias current vs. temperature MAX44251 toc08 i bias (pa) -1000 -750 -500 -250 0 250 500 750 1000 -1250 temperature (c) 125 100 50 75 02 5 -25 -50 150 negative i bias positive i bias common-mode rejection ratio vs. frequency MAX44251 toc09 frequency (hz) cmrr (db) 1m 100k 1k 10k 10 100 1 0 20 40 60 80 100 120 140 160 -20 0.1 100m 10m www.datasheet.co.kr datasheet pdf - http://www..net/
????????????????????????????????????????????????????????????????? maxim integrated products 7 MAX44251/max44252 20v, ultra-precision, low-noise op amps typical operating characteristics (continued) (v dd = 10v, v ss = 0v, outputs have r l = 10k i to v dd /2. t a = +25 n c, unless otherwise specified.) common-mode rejection ratio vs. temperature MAX44251 toc10 cmrr (db) 80 100 120 140 160 60 temperature (c) 100 50 75 02 5 -25 -50 125 power-supply rejection ratio vs. frequency MAX44251 toc11 frequency (hz) psrr (db) 1m 100k 1k 10k 10 100 1 -20 0 20 40 60 80 100 120 140 160 -40 0.1 100m 10m v cm = 0v output voltage swing high vs. temperature MAX44251 toc12 temperature (c) 125 100 50 75 02 5 -25 -50 150 v oh (mv) 5 10 15 20 25 30 35 0 r l = 10ki to v dd /2 2 4 6 8 10 12 14 16 18 0 output voltage swing low vs. temperature MAX44251 toc13 temperature (c) 125 100 50 75 02 5 -25 -50 150 v ol (mv) r l = 10ki to v dd /2 open-loop gain vs. frequency MAX44251 toc14 frequency (hz) open-loop gain (db) 1m 100k 1k 10k 10 100 1 0.1 10m 100m 160 180 140 120 100 80 60 40 20 0 -20 -40 -60 input voltage noise vs. frequency MAX44251 toc15 frequency (hz) input voltage noise (nv/hz) 10k 1k 100 5 10 15 20 25 30 0 10 100k input voltage 0.1hz to 10hz noise MAX44251 toc16 1s / div 0.2v/div input current noise vs. frequency MAX44251 toc17 frequency (hz) input current noise (pa/ hz) 1k 100 10 1 2 3 4 5 6 0 1 10k small-signal response MAX44251 toc18 frequency (hz) magnitude (db) 10m 1m 10k 100k 100 1k 10 -16 -14 -12 -10 -8 -6 -4 -2 0 2 -18 1 100m v in = 100mv p-p www.datasheet.co.kr datasheet pdf - http://www..net/
????????????????????????????????????????????????????????????????? maxim integrated products 8 MAX44251/max44252 20v, ultra-precision, low-noise op amps typical operating characteristics (continued) (v dd = 10v, v ss = 0v, outputs have r l = 10k i to v dd /2. t a = +25 n c, unless otherwise specified.) magnitude (db) -45 -40 -35 -30 -25 -20 -15 -10 -5 0 5 -50 large-signal response MAX44251 toc19 frequency (hz) 1m 100k 1k 10k 10 100 1 0.1 100m 10m v in = 2v p-p power-up time MAX44251 toc22 time (10s / div) 25s v dd = v ss = 0v v dd = 5v v ss = 5v voltage (1v/div) 0v 0v supply voltage (5v/div) v offset (10mv/div) 1k 100 10k stability vs. capacitive and resistive load in parallel with c l MAX44251 toc25 capacitive load (pf) resistive load (k i ) 10 20 30 40 50 60 70 80 90 100 0 stable unstable small-signal step response vs. time MAX44251 toc20 time (2s / div) a v = 1v/v v in = 100mv p-p input output voltage (100mv/div) total harmonic distortion vs. frequency MAX44251 toc23 frequency (hz) magnitude (db) 10k 1k -135 -130 -125 -120 -115 -110 -105 -100 -140 100 100k stability vs. capacitive and r iso in series with c load MAX44251 toc26 capacitive load (pf) r iso ( i ) 10k 1k 1 2 3 4 5 6 7 8 0 100 100k stable unstable large-signal step response vs. time MAX44251 toc21 time (2s / div) a v = 1v/v v in = 2v p-p input output voltage (1v/div) total harmonic distortion vs. input voltage MAX44251 toc24 input voltage (v) magnitude (db) 1.75 1.50 1.25 1.00 0.75 0.50 -120 -100 -80 -60 -40 -20 0 -140 0.25 2.00 v cc = 3.3v www.datasheet.co.kr datasheet pdf - http://www..net/
????????????????????????????????????????????????????????????????? maxim integrated products 9 MAX44251/max44252 20v, ultra-precision, low-noise op amps pin description pin configurations pin name function sot23 max soic 1 1 1 outa channel a output 2 2 2 ina- channel a negative input 3 3 3 ina+ channel a positive input 4 4 11 v ss negative supply voltage 5 5 5 inb+ channel b positive input 6 6 6 inb- channel b negative input 7 7 7 outb channel b output 8 8 4 v dd positive supply voltage 8 outc channel c output 9 inc- channel c negative input 10 inc+ channel c positive input 12 ind+ channel d positive input 13 ind- channel d negative input 14 outd channel b output top view 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 + 14 soic max44252 1 2 3 4 8 7 6 5 v dd outb inb- inb+ v ss ina+ ina- outa 8 max + MAX44251 8 sot23 MAX44251 v ss 1 2 ina- ina+ outa 3 4 inb- inb+ 8 7 v dd outb 6 5 + www.datasheet.co.kr datasheet pdf - http://www..net/
???????????????????????????????????????????????????????????????? maxim integrated products 10 MAX44251/max44252 20v, ultra-precision, low-noise op amps detailed description the MAX44251/max44252 are high-precision amplifiers that have less than 3 f v of typical input-referred offset and low flicker noise. these characteristics are achieved through an autozeroing technique that samples and finds repeating patterns of signal to cancel the input offset volt - age and 1/f noise of the amplifier. autozero the ics feature an autozero circuit that allows the devices to achieve less than 6 f v (max) of input offset voltage at room temperature and eliminate the 1/f noise. noise suppression flicker noise, inherent in all active devices, is inversely proportional to frequency presented. 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. electromagnetic interference (emi) noise occurs at high - er frequency that results in malfunction or degradation of electrical equipment. the ics have an input emi filter to avoid the output get - ting affected by radio frequency interference. the emi filter composed of passive devices presents significant higher impedance to higher frequency. high supply voltage range the ics feature 1.15ma current consumption per channel and a voltage supply range from either 2.7v to 20v single supply or 1.35v to 10v split supply. applications information the ics are ultra-high-precision operational amplifiers with a high supply voltage range designed for load cell, medi - cal instrumentation and precision instrument applications. these devices are also designed to interface with pres - sure transducers and are ideal for precision weight scale application as shown in figure 1. adc buffer amplifier the MAX44251/max44252's low input offset voltage, low noise, and fast settling time make these amplifiers ideal for adc buffers. weigh scales are one application that often require a low-noise, high-voltage amplifier in front of an adc. figure 1 details an example of a load cell and amplifier driven from the same q 10v supplies, along with the max11211 18-bit delta sigma adc. load cells pro - duce a very small voltage change at their outputs, there - fore driving 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 MAX44251/max44252's low input offset voltage and low noise allow a gain circuit prior to the max11211 with - out losing any dynamic range at the adc. figure 1. weight scale application circuit 20v 20v 20v 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 MAX44251 MAX44251 max11211 max6126 MAX44251 r r 20v 1.5v buffer r r r 1 output www.datasheet.co.kr datasheet pdf - http://www..net/
???????????????????????????????????????????????????????????????? maxim integrated products 11 MAX44251/max44252 20v, ultra-precision, low-noise op amps error budget example when using the ics as an adc buffer in strain gauge application, the temperature drift should be taken into consideration to determine maximum input signal. a typical strain gauge has sensitivity specification of just 2mv/v at rated out load. this means that when the strain gauge load cell is powered with 10v, the full-scale output voltage is 20mv. in this application, both offset voltage and drift are critical parameters that directly affect the accuracy of measurement. even though offset voltage could be calibrated out, its drift over temperature is still a problem. the ics, with a typical offset drift of 5nv/c, guarantee that the drift over a 10c range is only 50nv. setting this equal to 0.5 lsb in a 18-bit system yields a full-scale range of 13mv. with a single 10v supply, an acceptable closed-loop gain of 770v/v provides sufficient gain while maintaining headroom. precision low-side current sensing the ics autozero feature produces ultra-low offset voltage and drift, making them ideal for precision cur - rent-sensing applications. figure 2 shows the ics in a low-side current-sense configuration. this circuit pro - duces an accurate output voltage, v out equal to i load x r sense x r 2 /r 1 . figure 2. low-side current sensing ordering information + denotes a lead(pb)-free/rohs-compliant package. * future productcontact factory for availability. chip information process: bicmos functional diagrams part temp range pin- package top mark MAX44251 aka+ -40 n c to +125 n c 8 sot23 aerc MAX44251aua+ -40 n c to +125 n c 8 f max max44252 asd+* -40 n c to +125 n c 14 soic v supply out i load r sense r 1 r 2 MAX44251 max44252 5 6 7 10 9 8 inb- inb+ v ss 1 2 8 7 v dd outb ina- ina+ outa top view 3 4 6 5 MAX44251 + ind+ v ss v dd inb+ 1 2 14 13 outd ind- ina- ina+ inb- outb outa 3 4 12 11 inc+ inc- outc max44252 + www.datasheet.co.kr datasheet pdf - http://www..net/
???????????????????????????????????????????????????????????????? maxim integrated products 12 MAX44251/max44252 20v, ultra-precision, low-noise op amps package information for the latest package outline information and land patterns (footprints), 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 the package regardless of rohs status. package type package code outline no. land pattern 8 sot23 k8+5 21-0078 90-0176 8 f max u8+1 21-0036 90-0092 14 soic s14m+5 21-0041 9 0-0096 www.datasheet.co.kr datasheet pdf - http://www..net/
???????????????????????????????????????????????????????????????? maxim integrated products 13 MAX44251/max44252 20v, ultra-precision, low-noise op amps package information (continued) for the latest package outline information and land patterns (footprints), 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 the package regardless of rohs status. www.datasheet.co.kr datasheet pdf - http://www..net/
???????????????????????????????????????????????????????????????? maxim integrated products 14 MAX44251/max44252 20v, ultra-precision, low-noise op amps package information (continued) for the latest package outline information and land patterns (footprints), 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 the package regardless of rohs status. www.datasheet.co.kr datasheet pdf - http://www..net/
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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 15 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. MAX44251/max44252 20v, ultra-precision, low-noise op amps revision history revision number revision date description pages changed 0 10/11 initial release www.datasheet.co.kr datasheet pdf - http://www..net/

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