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max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps ????????????????????????????????????????????????????????????????? maxim integrated products 1 general description the max44260/max44261 offer a unique combination of high speed, precision, low noise, and low-voltage opera - tion making them ideally suited for a large number of signal processing functions such as filtering and ampli - fication of signals in portable and industrial equipment. the amplifiers feature an input offset of less than 50 fv and a high-gain bandwidth product of 15mhz while maintaining a low 1.8v supply rail. the devices rail-to- rail input/outputs and low noise guarantee maximum dynamic range in demanding applications such as 12- to 14-bit sar adc drivers. unlike traditional rail-to-rail input structures, input crossover distortion is absent due to an optimized input stage with an ultra-quiet charge pump. the max44260 includes a fast-power-on shutdown mode for further power savings. the max44261 offers a unique on-demand calibration pin where the user can invoke self-trimming of the input offset voltage. the family of parts operates from a supply range of 1.8v to 5.5v over the -40 n c to +125 n c temperature range and can operate down to 1.7v over the 0 n c to +70 n c tem- perature range. the max44260/max44261 are available in small, 6-pin sc70 packages. the max44260 is also available in a 1mm x 1.5mm thin dfn (ultra-thin lga) package. features s low 1.8v supply rail over the -4 0 c to +125c range 1.7v supply rail over the 0 c to +70 c range s 15mhz unity-gain bandwidth s low 12.7nv/ hz input voltage-noise density s low 1.2fa/ hz input current-noise density s low 50v (max) v os at +25 c s on-demand v os self-calibration (max44261) s 500fa low input bias current s 750a quiescent current per amplifier s < 1a supply current in shutdown s small, 2mm x 2mm sc70 and 1mm x 1.5mm thin dfn (max44260) packages s low 110db total harmonic distortion applications notebooks 3g/4g handsets portable media players portable medical instruments battery-operated devices analog-to-digital converter buffers transimpedance amplifiers general-purpose signal processing 19-5873; rev 1; 8/11 ordering information appears at end of data sheet. typical a pplicati on circuit for related parts and recommended products to use with this part, refer to: www.maxim-ic.com/max44260.related e v a l u a t i o n k i t a v a i l a b l e max44260 15nf +3.3v 330pf 3.3nf sallen-key filter corner frequency = 10khz 22ki 2.4ki 10ki adc max11645 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
????????????????????????????????????????????????????????????????? maxim integrated products 2 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps in+, in-, out ................................. (v ss - 0.3v) to (v dd + 0.3v) v dd to v ss ............................................................... -0.3v to +6v shdn, cal ............................................................. -0.3v to +6v output to short-circuit ground duration .............................. 10s continuous input current into any pin ............................ q20ma continuous power dissipation ( t a = +70 nc) sc70 (derate 3.1mw/ n c above +70nc) ...................... 245mw 6-pin thin dfn (ultra-thin lga) (derate 2.1mw/ n c above +70nc) ............................. 110.2mw operating temperature range ........................ -40n c to +125nc junction temperature ..................................................... +150nc lead temperature (soldering, 10s) ................................ +300nc soldering temperature (reflow) ...................................... +260nc 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. sc70 junction-to-ambient thermal resistance ( b ja ) .... 326.5 nc/w junction-to-case thermal resistance ( b jc ) ............. 115nc/w thin dfn (ultra-thin lga) junction-to-ambient thermal resistance ( b ja ) ....... 470 nc/w package thermal characteristics (note 1) electrical characteristics (v dd = 3.3v, v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, v cal = v shdn = v dd , t a = -40 n c to +125n c. typical values are at t a = +25 n c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units dc characteristics input voltage range v in+ v in- guaranteed by cmrr test -0.1 v dd + 0.1 v input offset voltage v os t a = +25nc 10 50 fv t a = -40c to +125c after calibration 100 t a = -40c to +125c 500 input offset voltage drift v os - tc 0.8 5 fv/nc input bias current i b t a = +25nc 0.01 0.5 pa t a = -40nc to +85nc 10 t a = -40nc to +125nc 100 input capacitance c in 4 pf common-mode rejection ratio cmrr v cm = -0.1v to (v dd + 0.1v) 75 90 db open-loop gain a ol 0.4v p v out p v dd - 0.4v, r out = 10ki 100 115 db 0.4v p v out p v dd - 0.4v, r out = 600i 91 100 0.4v p v out p v dd - 0.4v, r out = 32i 80 output short-circuit current i sc to v dd or v ss 50 ma
????????????????????????????????????????????????????????????????? maxim integrated products 3 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps note 2: all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design. 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, v cal = v shdn = v dd , t a = -40 n c to +125n c. typical values are at t a = +25 n c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units output voltage swing v ol - v ss r out = 10ki 20 mv r out = 600i 50 r out = 32i 400 700 v dd - v oh r out = 10ki 10 r out = 600i 40 r out = 32i 400 800 ac characteristics input voltage-noise density e n f = 10khz 12.7 nv/hz input current-noise density i n f = 10khz 1.2 fa/hz gain-bandwidth product gbwp 15 mhz slew rate sr 7 v/fs settling time v out = 2v p-p , v dd = 3.3v, a v = 1v/v, c l = 30pf (load), settle to 0.01% 1.7 s capacitive loading c load no sustained oscillation 300 pf total harmonic distortion thd f = 10khz, v o = 2v p-p , a v = 1, r out = 10k i -110 db output transient recovery time dv out = 0.2v, v dd = 3.3v , a v = 1v/v; r s = 20?, c l = 1nf (load) 1 s power-supply characteristics power-supply range v dd guaranteed by psrr 1.8 5.5 v t a = 0nc to +70nc 1.7 5.5 power-supply rejection ratio psrr v cm = v dd /2 82 95 db quiescent current i dd 750 1200 a shutdown supply current i shdn max44260/max44261 only 1 a shutdown input low v il 0.7 v shutdown input high v ih 1.3 v output leakage current in shutdown i shdn 100 pa shutdown input bias current i il /i ih max44260 1 a max44261 0.1 shutdown turn-on time t shdn 15 s turn-on time t on 10 ms
????????????????????????????????????????????????????????????????? maxim integrated products 4 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps typical operating characteristics (v dd = 3.3v, v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, v cal = v shdn = v dd , t a = -40 n c to +125 n c. typical values are at t a = +25 n c, unless otherwise noted. all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design.) input offset voltage vs. common-mode voltage max44260 toc01 common-mode voltage (v) input offset voltage (v) 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 -20 0 20 40 60 -60 -0.5 3.5 t a = +125c t a = +25c t a = -40c input offset drift histogram max44260 toc04 input offset drift (v/c) percent occurrence (%) 2 4 6 8 10 12 14 16 18 0 -2 -1.8 -1.5 -1.3 -1 -0.8 -0.5 -0.3 0 0.25 0.50 0.75 1.00 1.25 input offset voltage vs. supply voltage max44260 toc02 supply voltage (v) input offset voltage (v) 5.0 4.5 3.5 4.0 2.5 3.0 2.0 -80 -60 -40 -20 0 20 40 60 80 100 -100 1.5 5.5 t a = +125c t a = +25c t a = -40c input bias current vs. common-mode voltage max44260 toc05 common-mode voltage (v) input bias current (pa) 3.0 2.5 1.5 2.0 0.5 1.0 0 -80 -60 -40 -20 0 20 40 60 80 100 -100 -0.5 3.5 t a = +85c t a = -40c t a = +125c t a = +25c input v os histogram max44260 toc03 input offset voltage (v) percent occurrence (%) 5 10 15 20 25 0 -15 -10 -5 0 5 10 15 20 25 output-voltage low vs. output sink current (v ol - v ee , v cc = 1.8v) max44260 toc06 output sink current (ma) output-voltage low (mv) 10 1 20 40 60 80 100 120 140 160 180 200 0 0.1 100 t a = +125c t a = +25c t a = -40c
????????????????????????????????????????????????????????????????? maxim integrated products 5 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps typical operating characteristics (continued) (v dd = 3.3v, v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, v cal = v shdn = v dd , t a = -40 n c to +125 n c. typical values are at t a = +25 n c, unless otherwise noted. all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design.) output-voltage low vs. output sink current (v ol - v ee , v cc = 3.3v) max44260 toc07 output sink current (ma) output-voltage low (mv) 10 1 20 40 60 80 100 120 140 160 180 200 0 0.1 100 t a = +125c t a = +25c t a = -40c output-voltage high vs. output source current (v cc - v oh , v cc = 3.3v) max44260 toc10 output source current (ma) output-voltage high (mv) 10 1 20 40 60 80 100 120 140 160 180 200 0 0.1 100 t a = +25c t a = +125c t a = -40c output-voltage low vs. output sink current (v ol - v ee , v cc = 5v) max44260 toc08 output sink current (ma) output-voltage low (mv) 10 1 20 40 60 80 100 120 140 160 180 200 0 0.1 100 t a = +125c t a = -40c t a = +25c output-voltage high vs. output source current (v cc - v oh , v cc = 5v) max44260 toc11 output source current (ma) output-voltage high (mv) 10 1 20 40 60 80 100 120 140 160 180 200 0 0.1 100 t a = +25c t a = +125c t a = -40c output-voltage high vs. output source current (v cc - v oh , v cc = 1.8v) max44260 toc09 output source current (ma) output-voltage high (mv) 10 1 20 40 60 80 100 120 140 160 180 200 0 0.1 100 t a = +25c t a = +125c t a = -40c supply current vs. supply voltage max44260 toc12 supply voltage (v) supply current (a) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 650 700 750 800 850 900 600 1.5 5.5 t a = -40c t a = +125c t a = +25c
????????????????????????????????????????????????????????????????? maxim integrated products 6 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps typical operating characteristics (continued) (v dd = 3.3v, v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, v cal = v shdn = v dd , t a = -40 n c to +125 n c. typical values are at t a = +25 n c, unless otherwise noted. all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design.) shutdown supply current vs. supply voltage (v shdn = v ee ) max44260 toc13 supply voltage (v) shutdown supply current (a) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 5.04.54.03.53.02.52.01.5 5.5 t a = -40c t a = +125c t a = +25c power-supply rejection ratio vs. frequency max44260 toc16 frequency (khz) psrr (db) 10k1k1001010.1 -100 -80 -60 -40 -20 0 -120 0.01 100k open-loop gain vs. frequency max44260 toc14 frequency (khz) open-loop gain (db) 10k1k10010100.01 20 40 60 80 100 120 0 0.001 100k dc cmrr and psrr vs. temperature max44260 toc17 temperature (c) rejection ratio (db) 100 75 50 25 0 -25 -98 -96 -94 -92 -90 -100 -50 125 dc cmrr dc psrr common-mode rejection ratio vs. frequency max44260 toc15 frequency (khz) cmrr (db) -100 -80 -60 -40 -20 0 -120 10k1k10010100.01 100k input voltage-noise density vs. frequency max44260 toc18 frequency (khz) input-voltage noise density (nv/hz) 1k1001010.1 50 100 150 200 250 300 350 400 450 500 0 0.01 10k
????????????????????????????????????????????????????????????????? maxim integrated products 7 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps typical operating characteristics (continued) (v dd = 3.3v, v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, v cal = v shdn = v dd , t a = -40 n c to +125 n c. typical values are at t a = +25 n c, unless otherwise noted. all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design.) 0.1hz to 10hz output-voltage noise max44260 toc19 0.5v/div 4s/div total harmonic distortion vs. frequency (v in = 2v p-p ) max44260 toc22 frequency (hz) thd (db) 10k1k 10 100 -115 -110 -105 -100 -95 -90 -85 -80 -120 1 100k v cc = 5.5v v cc = 3.3v input current-noise density vs. frequency max44260 toc20 frequency (hz) input-current noise density (fa/hz) 10k 1000 100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 10 100k small-signal transient response max44260 toc23 input 50mv/div v cc /2 output 50mv/div v cc /2 200ns/div total harmonic distortion vs. input amplitude (f = 10khz, v cc = 5.5v, a v = 1v/v) max44260 toc21 input amplitude (v) thd (db) 4.5 4.0 0.5 1.0 1.5 2.5 3.0 2.0 3.5 85 90 95 100 105 110 115 120 80 0 5.0 large-signal transient response max44260 toc24 input 1v/div v cc /2 output 500mv/div v cc /2 100ns/div
????????????????????????????????????????????????????????????????? maxim integrated products 8 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps typical operating characteristics (continued) (v dd = 3.3v, v ss = 0v, v in+ = v in- = v dd /2, r l = 10k i to v dd /2, v cal = v shdn = v dd , t a = -40 n c to +125 n c. typical values are at t a = +25 n c, unless otherwise noted. all devices are 100% production tested at t a = +25 n c. temperature limits are guaranteed by design.) percent overshoot vs. load resistance (v in = 100mv p-p ) max44260 toc25 load resistance (i) overshoot (%) 10k 1k 2 4 6 8 10 12 14 16 18 20 0 100 100k power-up time max44260 toc28 v cc 2v/div output 500mv/div gnd gnd 4ms/div turn-on time from shutdown max44260 toc29 output 500mv/div v ss v ss 10s/div shdn 2v/div stability vs. capacitive load and isolation resistance max44260 toc26 capacitive load (pf) isolation resistance (i) 3500 3000 2000 2500 1000 1500 500 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 0 0 4000 stable unstable stability vs. capacitive and resistive load max44260 toc27 capacitive load (pf) resistive load (i) 10k 1k 10 100 1k 10k 100k 1 100 100k stable unstable
????????????????????????????????????????????????????????????????? maxim integrated products 9 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps pin description pin configurations pin name function max44260 max44261 1 1 in+ positive input ina+ positive input a inb+ positive input b 2 2 v ss negative power supply. bypass with a 0.1 f f capacitor to ground. 3 3 in- negative input ina- negative input a inb- negative input b 4 4 out output outa output a outb output b 5 cal active-low calibrate input 5 shdn active-low shutdown 6 6 v dd positive power supply. bypass with a 0.1 f f capacitor to ground. top view not to scale sc70 v ss 2 in+ 1 in- 3 shdn 5 v dd 6 out 4 max44260 sc70 v ss 2 in+ 1 in- 3 cal 5 v dd + + 6 out 4 max44261 1 2 3 6 5 4 v dd out shdn in+ + in- v ss thin dfn (ultra-thin lga) max44260
???????????????????????????????????????????????????????????????? maxim integrated products 10 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps detailed description the max44260/max44261 are high-speed low-power op amps ideal for signal processing applications due to the devices high precision and low-noise cmos inputs. the devices self-calibrate on power-up to eliminate effects of temperature and power-supply variation. the max44260 also features a low-power shutdown mode that greatly reduces quiescent current while the device is not operational and recovers in 30s. the max44261 features a user-selectable self-calibration input that shuts down the device and allows it to be reca - librated at any time. the calibration routine takes 10ms. crossover distortion these op amps feature a low-noise integrated charge pump that creates an internal voltage rail 1v above v dd, which is used to power the input differential pair of pmos transistors as shown in figure 1 . such a unique architecture eliminates crossover distor - tion common in traditional cmos input architecture ( figure 2 ), especially when used in a noninverting configuration, such as for sallen-key filters. the charge pumps operating frequency lies well above the unity-gain frequency of the amplifier. thanks to its high- frequency operation and ultra-quiet circuitry, the charge pump generates little noise, does not require external components, and is entirely transparent to the user. figure 1. comparing the input structure of the max44260 to standard op-amp inputs figure 2. crossover distortion of typical amplifiers standard input structure max44260 inputs structure internal charge pump crossover distortion max44261 time amplifier output
???????????????????????????????????????????????????????????????? maxim integrated products 11 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps applications information power-up autotrim the ics feature an automatic trim that self-calibrates the v os of these devices to less than 100 f v of input offset voltage on power-up. this self-calibration feature allows the device to eliminate input offset voltage effects due to power supply and operating temperature variation simply by cycling its power. the autotrim sequence takes approximately 10ms to complete and is triggered by an internal power-on-reset (por) circuitry. during this time, the inputs and outputs are put into high impedance and left unconnected. the max44261 can also be forced into a self-calibration cycle by pulling the cal input low for 1ms. this input also puts the part into shutdown mode. shutdown operation the max44260 features an active-low shutdown mode that puts both inputs and outputs into high impedance and substantially lowers the quiescent current to less than 1 f a. putting the output into high impedance allows multiple outputs to be multiplexed onto a single output line without the additional external buffers. the device does not self-calibrate when exiting shutdown mode and retains its power-up trim settings. figure 3 shows that the device also recovers from shutdown in under 30fs. the max44261 features a recalibrate input that acts the same as the shutdown mode of the max44260. however, when the input is pulled low, the device goes through a self-calibration sequence again ( figure 3 ). the shutdown logic levels of the devices are indepen - dent of supply, allowing the shutdown feature of the device to operate off of a 1.8v or 3.3v microcontroller, regardless of supply voltage. rail-to-rail input/output the input voltage range of the ics extends 100mv above v dd and below v ss . the wide input common- mode voltage range allows the op amp to be used as a buffer and as a differential amplifier in a wide-variety of signal processing applications. output voltage high/ low is designed to be only 50mv above v ss and below v dd allowing maximum dynamic range in single-supply applications. the high output current and capacitance drive capability of the devices make them ideal as an adc driver and a line driver. figure 3. cal vs. shdn input operation. v dd /2 0v 0v v shdn /v cal max44261 output 30s 10ms autotrim sequence recalibrated amplifier active max44260 output v dd /2 0v v dd fast recovery amplifier active
???????????????????????????????????????????????????????????????? maxim integrated products 12 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps input bias current the ics feature a high-impedance cmos input stage and a specialized esd structure that allows low-input bias current operation at low-input, common-mode volt - ages. low-input bias current is useful when interfacing with high-ohmic sensors. it is also beneficial for design - ing transimpedance amplifiers for photodiode sensors. this makes these devices ideal for ground-referenced medical and industrial sensor applications. active filters the max44260/max44261 are ideal for a wide variety of active filter circuits that make use of their wide band - width, rail-to-rail input/output stages and high-impedance cmos inputs. the typical application circuit shows an example sallen-key active filter circuit with a corner frequency of 10khz. at low frequencies, the amplifier behaves like a simple low-distortion noninverting buf - fer, while its high bandwidth gives excellent stopband attenuation above its corner frequency. see the typical application circuit . driver for interfacing with the max11645 adc the ics tiny size and low noise makes them a good fit for driving 12- to 16-bit resolution adcs in space-constrained applications. the typical application circuit shows the max44260 amplifier output connected to a lowpass filter driving the max11645 adc. the max11645 is part of a family of 3v and 5v, 12-bit and 10-bit, 2-channel adcs. the max11645 offers sample rates up to 94ksps and measures two single-ended inputs or one differential input. these adcs dissipate 670 f a at the maximum sampling rate, but just 6 f a at 1ksps and 0.5f a in shut- down. offered in the ultra-tiny, 1.9mm x 2.2mm wlp and f max-8 packages, the max11645 adcs are an ideal fit to pair with the max44260/max44261 amplifiers in por - table applications. where higher resolution is required, refer to the max1069 (14-bit) and max1169 (16-bit) adc families. ordering information + denotes a lead(pb)-free/rohs-compliant package. *future productcontact factory for availability. chip information process: bicmos part temp range pin- package top mark max44260 axt+ -40 n c to +125 n c 6 sc70 +aeb max44260ayt+ * -40 n c to +125 n c 6 thin fdfn (ultra-thin lga) +ay max44261 axt+ -40 n c to +125 n c 6 sc70 +aec
???????????????????????????????????????????????????????????????? maxim integrated products 13 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o 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 no. 6 sc70 x6sn+1 21-0077 90-0189 6 thin fdfn (ultra-thin lga) y61a1+1 21-0190 90-0233
???????????????????????????????????????????????????????????????? maxim integrated products 14 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o 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. 6l ultra thinlga.eps table 2 table 1
???????????????????????????????????????????????????????????????? maxim integrated products 15 max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps 6l ultra thinlga.eps table 2 table 1 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.
max44260/max44261 1.8v 15mhz low-offset, low-power, rail-to-rail i/o op amps 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. 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 products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 16 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 6/11 initial release 1 8/11 added thin m dfn (ultra-thin lga) package and updated slew rate and toc 29 1, 2, 3, 8, 9, 12

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