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1 ? fn6154.3 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. copyright ? intersil americas inc. 2006, 2007. all rights reserved. all other trademarks mentioned are the property of their respective owners. isl28156, ISL28256 39a micropower single and dual precision rail-to-rail input-output (rrio) low input bias current op amps the isl28156 and ISL28256 are micropower precision operational amplifiers optimized for single supply operation at 5v and can operated down to 2.4v. these devices feature an input range enhancement circuit (irec) which enables them to maintain cmrr performance for input voltages greater than the positive supply. the input signal is capable of swinging 0.5v above a 5.0v supply (0.25 for a 2.5v supply) and to within 10mv from ground. the output operation is rail-to-rail. the 1/f corner of the voltage no ise spectrum is at 1khz. this results in low frequency noise performance which can only be found on devices with an order of magnitude higher supply current. isl28156 and ISL28256 can be operated from one lithium cell or two ni-cd batteries. the input range includes both positive and negative rail. the ou tput swings to both rails. features ? 39a typical supply current ? 5na max input bias current ? 250khz gain bandwidth product (a v = 1) ? 2.4v to 5.5v single supply voltage range ? rail-to-rail input and output ? enable pin (isl28156 only) ? pb-free plus anneal available (rohs compliant) applications ? battery- or solar-powered systems ? 4ma to 20ma current loops ? handheld consumer products ? medical devices ? sensor amplifiers ? adc buffers ? dac output amplifiers ordering information part number (note) part marking tape and reel package (pb-free) pkg. dwg. # isl28156fhz-t7 gabv 7? (3k pcs) 6 ld sot-23 mdp0038 isl28156fbz 28156fbz 97/tube 8 ld soic mdp0027 isl28156fbz-t7 28156fbz 7? (1k pcs) 8 ld soic mdp0027 coming soon ISL28256faz-t7 7? (1k pcs) 8 ld soic mdp0027 coming soon ISL28256faz-t7 7? 8 ld msop mdp0043 note: intersil pb-free plus anneal products employ special pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish , which are rohs compliant and compatible with both snpb and pb-free soldering operations. intersil pb-free products are msl classi fied at pb-free peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. pinouts isl28156 (6 ld sot-23) top view isl28156 (8 ld soic) top view ISL28256 (8 ld soic) top view ISL28256 coming soon (8 ld msop) top view 1 2 3 6 4 5 +- out v- in+ v+ enable in- 1 2 3 4 8 7 6 5 - + nc in- in+ enable v+ out v- nc 1 2 3 4 8 7 6 5 out_a in-_a in+_a v+ out_ b in-_b v- in+_b + - +- 1 2 3 4 8 7 6 5 out_a in-_a in+_a v+ out_b in-_b v- in+_b + - +- data sheet august 9, 2007
2 fn6154.3 august 9, 2007 absolute maxi mum ratings (t a = +25c) thermal information supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5v supply turn on voltage slew rate . . . . . . . . . . . . . . . . . . . . . 1v/ s differential input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5ma differential input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5v input voltage . . . . . . . . . . . . . . . . . . . . . . . . . v- - 0.5v to v+ + 0.5v esd tolerance, human body model . . . . . . . . . . . . . . . . . . . . . .3kv esd tolerance, machine model . . . . . . . . . . . . . . . . . . . . . . . . .300v thermal resistance ja (c/w) 6 ld sot-23 package . . . . . . . . . . . . . . . . . . . . . . . 230 6 ld so package . . . . . . . . . . . . . . . . . . . . . . . . . . 110 8 ld msop package . . . . . . . . . . . . . . . . . . . . . . . . 115 output short-circuit duration . . . . . . . . . . . . . . . . . . . . . . .indefinite ambient operating temperature range . . . . . . . . .-40c to +125c storage temperature range . . . . . . . . . . . . . . . . . .-65c to +150c operating junction temperature . . . . . . . . . . . . . . . . . . . . . +125c caution: do not operate at or near the maximum ratings listed fo r extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. important note: all parameters having min/max specifications are guaranteed. typical values are for information purposes only. u nless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a electrical specifications v + = 5v, v - = 0v,v cm = 2.5v, t a = +25c unless otherwise specified. boldface limits apply over the operating temperature r ange, -40c to +125c, temperature data established by characterization parameter description conditions min typ max unit v os input offset voltage 8 ld so -120 -200 -7 120 250 v 6 ld sot-23 -400 -450 -7 400 450 v input offset drive vs temperature 1.5 v/c i os input offset current -1.5 -5 0.34 1.2 2.5 na i b input bias current -2 -3.5 1.14 5 5 na e n input noise voltage density f o = 1khz 46 nv/ hz i n input noise current density f o = 1khz 0.14 pa/ hz cmir input common-mode voltage range 0 5 v cmrr common-mode rejection ratio v cm = 0v to 5v 80 75 110 db psrr power supply rejection ratio v s = 2.4v to 5v 90 75 104 db a vol large signal voltage gain v o = 0.5v to 4.5v, r l = 100k 200 175 412 v/mv v o = 0.5v to 4.5v, r l = 1k 35 30 70 v/mv v out maximum output voltage swing output low, r l = 100k 36 8 mv output low, r l = 1k 130 150 200 mv output high, r l = 100k 4.992 4.99 4.985 v output high, r l = 1k 4.85 4.8 4.88 v sr slew rate 0.05 v/s gbw gain bandwidth product a v = 1 250 khz i s,on supply current, enabled 29 18 39 47 56 a i s,off supply current, disabled 10 14 16 a v os time ------------------ isl28156, ISL28256
3 fn6154.3 august 9, 2007 i o + short-circuit output current r l = 10 28 23 31 ma i o - short-circuit output current r l = 10 24 18 26 ma v supply supply operating range guaranteed by psrr test 2.4 5 v v enh enable pin high level 2 v v enl enable pin low level 0.8 v i enh enable pin input current v en = 5v 0.7 1 1.2 1.2 a i enl enable pin input current v en = 0v 10 16 25 30 na t en enable to output on-state delay time (isl28156) v out = 1v (enable state); v en = high to low 10.8 s t en enable to output off-state delay time (isl28156) v out = ov (disabled state) v en = low to high 0.1 s electrical specifications v + = 5v, v - = 0v,v cm = 2.5v, t a = +25c unless otherwise specified. boldface limits apply over the operating temperature r ange, -40c to +125c, temperature data established by characterization (continued) parameter description conditions min typ max unit typical performance curves figure 1. gain vs frequency vs rl figure 2. gain vs frequency vs c l figure 3. closed loop gain vs frequency figure 4. gain vs frequency vs v s -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 1k 10k 100k 1m frequency (hz) normalized gain (db) r l = 1k r l = 10k r l = 100k a v = 1 c l = 16.3pf v out = 10mv pp -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 frequency (hz) normalized gain (db) c l = 63.3pf c l = 55.3pf c l = 49.3pf c l = 43.3pf c l = 38.3pf c l = 34.3pf a v = 1 r l = 10k v out = 10mv pp 1k 10k 100k 1m -10 0 10 20 30 40 50 60 70 frequency (hz) gain (db) rf = 1m, rg = 1k, r l = 10k rf = 9.09, rg = 1k, r l = inf rf = 0, rg = inf, r l = 10k r l = 10k c l = 16.3pf v out = 10mv pp rf = 100k, rg = 1k, r l = 10k 1k 10k 100k 1m 100 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 1k 10k 100k 1m frequency (hz) normalized gain (db) v s = 2.4v v s = 5v a v = 1 r l = 10k v out = 10mv pp isl28156, ISL28256
4 fn6154.3 august 9, 2007 figure 5. gain vs frequency vs v out figure 6. gain vs frequency vs v out figure 7. gain vs frequency vs v out figure 8. cmrr vs frequency figure 9. psrr vs frequency; v s = 2.4v figure 10. psrr vs frequency; v s = 5v typical performance curves (continued) -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 frequency (hz) normalized gain (db) v out = 100mv v out = 10mv v out = 50mv v out = 1v a v = 1 r l = 1k c l = 16.3pf 1k 10k 100k 1m -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 frequency (hz) normalized gain (db) v out = 100mv v out = 10mv v out = 50mv v out = 1v a v = 1 r l = 10k c l = 16.3pf 1k 10k 100k 1m -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 frequency (hz) normalized gain (db) v out = 100mv v out = 10mv v out = 50mv v out = 1v a v = 1 r l = 100k c l = 16.3pf 1k 10k 100k 1m -70 -60 -50 -40 -30 -20 -10 0 10 frequency (hz) cmrr (db) v s = 5v a v = 1 r l = 10k v cm = 1v pp v s = 2.4v c l = 16.3pf a v = 1 r l = 10k v cm = 1v pp c l = 16.3pf 1k 10k 100k 1m 100 -80 -70 -60 -50 -40 -30 -20 -10 0 10 frequency (hz) psrr (db) psrr- psrr+ a v = 1 r l = 1k v out = 1v pp c l = 16.3pf v s = 2.4v 1k 10k 100k 1m 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 frequency (hz) psrr (db) psrr- psrr+ a v = 1 r l = 1k v out = 1v pp c l = 16.3pf v s =5v 1k 10k 100k 1m 100 isl28156, ISL28256
5 fn6154.3 august 9, 2007 figure 11. input voltage no ise vs frequency figure 12. in put current noise vs frequency figure 13. 1 to 10hz input noise figure 14. small signal step response figure 15. large signal step response figure 16. enable to output delay typical performance curves (continued) 0 20 40 60 80 100 120 140 160 1 10 100 1k 10k frequency (hz) input voltage noise (nv/ hz) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1 10 100 1k 10k frequency (hz) input current noise (pa/ hz) -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 10 time (s) input noise ( v) 9 8 7 6 5 4 3 2 1 0 a v = 1000 r f = 100k r l = 10k r i = 100 10 12 14 16 18 20 22 24 0 50 100 150 200 250 300 350 400 time ( s) small signal (mv) r f = r i =r l = 10k a v = 2 v out = 10mv pp c l = 16.3pf -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0 100 200 300 400 time ( s) large signal (v) r f = r i =r l = 10k a v = 2 v out = 1v pp c l = 16.3pf -1 0 1 2 3 4 5 6 0 102030405060708090100 time ( s) enable (v) -0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 output (v) v out v-enable r f = r i =r l = 10k a v = 2 v out = 10mv pp c l = 16.3pf isl28156, ISL28256
6 fn6154.3 august 9, 2007 figure 17. supply current enabled vs temperature v s = 2.5v figure 18. supply current disabled vs temperature v s = 2.5v figure 19. vio so8 package vs temperature v s = 2.5v figure 20. vio so8 package vs temperature v s = 1.2v figure 21. vio sot-23 package vs temperature v s = 2.5v figure 22. vio sot-23 package vs temperature v s = 1.2v typical performance curves (continued) 23 28 33 38 43 48 53 58 -40 -20 0 20 40 60 80 100 120 temperature ( c) current ( a) n = 1000 median min max 6.5 7.5 8.5 9.5 10.5 11.5 12.5 13.5 14.5 -40 -20 0 20 40 60 80 100 120 temperature ( c) current ( a) n = 1000 median min max -420 -320 -220 -120 -20 80 180 280 380 -40 -20 0 20 40 60 80 100 120 temperature ( c) vio ( v) n = 1000 median min max -400 -300 -200 -100 0 100 200 300 400 -40 -20 0 20 40 60 80 100 120 temperature ( c) vio ( v) n = 1000 median min max -420 -320 -220 -120 -20 80 180 280 380 -40 -20 0 20 40 60 80 100 120 temperature (c) n = 1000 median min max vio ( v) -400 -300 -200 -100 0 100 200 300 400 -40 -20 0 20 40 60 80 100 120 temperature (c) n = 1000 median min max vio ( v) isl28156, ISL28256
7 fn6154.3 august 9, 2007 figure 23. i bias+ vs temperature v s = 2.5v figure 24. i bias- vs temperature v s = 2.5v figure 25. i bias+ vs temperature v s = 1.5v figure 26. i bias- vs temperature v s = 1.2v figure 27. ios vs temperature v s = 2.5v figure 28. ios vs temperature v s = 1.5v typical performance curves (continued) -3 -2 -1 0 1 2 3 4 5 -40-200 20406080100120 temperature ( c) i bias+ (na) n = 1000 median min max -1 0 1 2 3 4 5 -40 -20 0 20 40 60 80 100 120 i bias- (na) temperature ( c) n = 1000 median min max -4 -3 -2 -1 0 1 2 -40 -20 0 20 40 60 80 100 120 i bias+ (na) temperature ( c) n = 1000 median min max -4 -2 0 2 4 6 8 10 -40 -20 0 20 40 60 80 100 120 i bias- (na) temperature ( c) n = 1000 median min max -6 -5 -4 -3 -2 -1 0 1 2 3 4 -40-200 20406080100120 ios (na) temperature ( c) n = 1000 median min max -10 -8 -6 -4 -2 0 2 4 ios (na) -40 -20 0 20 40 60 80 100 120 temperature ( c) n = 1000 median min max isl28156, ISL28256
8 fn6154.3 august 9, 2007 figure 29. cmrr vs temperature v+ = 2.5v, 1.5 v figure 30. psrr vs temperature 1.2v to 2.5v figure 31. v out high vs temperature v s = 2.5v, r l = 1k figure 32. v out high v s = 2.5v, r l = 100k figure 33. v out low v s = 2.5v, r l = 1k figure 34. v out low v s = 2.5v, r l = 100k typical performance curves (continued) 90 95 100 105 110 115 120 125 130 135 cmrr (db) -40 -20 0 20 40 60 80 100 120 n = 1000 median max min temperature ( c) -40 -20 0 20 40 60 80 100 120 temperature ( c) n = 1000 median min max 85 90 95 100 105 110 115 120 125 130 psrr (db) 4.850 4.855 4.860 4.865 4.870 4.875 4.880 4.885 4.890 4.895 4.900 v out (v) -40 -20 0 20 40 60 80 100 120 temperature ( c) n = 1000 median min max 4.9968 4.9970 4.9972 4.9974 4.9976 4.9978 4.9980 4.9982 4.9984 v out (v) -40 -20 0 20 40 60 80 100 120 temperature ( c) n = 1000 median min max 4.9968 4.9970 4.9972 4.9974 4.9976 4.9978 4.9980 4.9982 4.9984 v out (v) -40 -20 0 20 40 60 80 100 120 temperature ( c) n = 1000 median min max 2.5 3 3.5 4 4.5 5 v out (mv) -40 -20 0 20 40 60 80 100 120 temperature ( c) n = 1000 median min max isl28156, ISL28256
9 fn6154.3 august 9, 2007 applications information introduction the isl28156 is a single bimos rail-to-rail input, output (rrio) operational amplifier with an enable feature. the ISL28256 is a dual version wit hout the enable feature. both devices are designed to operate from single supply (2.4v to 5.0v) or dual supplies (1.2v to 2.5v) while drawing only 39 a of supply current per amplif ier. this combination of low power and precision performance makes this device suitable for a variety of low power applications including battery powered systems. rail-to-rail input/output these devices feature bipolar inputs which have an input common mode range that extends up to 0.5v beyond the v+ rail, and to within 10mv of the v- rail. the cmos outputs typically swing to within about 4mv of the supply rails with a 100k load. the nmos sinks current to swing the output in the negative direction. the pmos sources current to swing the output in the positive direction. input protection all input terminals have internal esd protection diodes to both positive and negative supply rails, limiting the input voltage to within one diode beyond the supply rails. they also contain back-to-back diodes across the input terminals. for applications where the input differ ential voltage is expected to exceed 0.5v, external series re sistors must be used to ensure the input currents never exceed 5ma (figure 35). enable/disable feature the isl28156 offers an en pin that disables the device when pulled up to at least 2.0v. in the disabled state (output in a high impedance state), t he part consumes typically 10a. by disabling the part, multiple isl28156 parts can be connected together as a mux. in this configuration, the outputs are tied together in parallel and a channel can be selected by the en pin. the en pin also has an internal pull down. if left open, the en pin will pull to the negative rail and the device will be enabled by default. pin descriptions isl28156 (6 ld sot-23) isl28156 (8 ld so) ISL28256 (8 ld msop) pin name function equivalent circuit 1, 5 nc not connected 422 (a) 6 (b) in- inverting input circuit 1 333 (a) 5 (b) in+ non-inverting input (see circuit 1) 2 4 4 v- negative supply 161 (a) 7 (b) out output circuit 2 6 7 8 v+ positive supply 5 8 enable chip enable circuit 3 in- v+ v- in+ v + v- out v + v- ce figure 35. input current limiting - + r in r l v in v out isl28156, ISL28256
10 fn6154.3 august 9, 2007 the loading effects of the feedback resistors of the disabled amplifier must be considered when multiple amplifier outputs are connected together. using only one channel the ISL28256 is a dual op amp. if the application only requires one channel, the user must configure the unused channel to prevent it from o scillating. the unused channel will oscillate if the input and output pins are floating. this will result in higher than expected supply currents and possible noise injection into the channel being used. the proper way to prevent this oscillation is to short the output to the negative input and ground the positive input (as shown in figure 36). current limiting these devices have no internal current-limiting circuitry. if the output is shorted, it is possible to exceed the absolute maximum rating for output current or power dissipation, potentially resulting in the destruction of the device. power dissipation it is possible to exceed the +125c maximum junction temperatures under certain load and power-supply conditions. it is therefore important to calculate the maximum junction temperature (t jmax ) for all applications to determine if power supply voltages, load conditions, or package type need to be modified to remain in the safe operating area. these parameters are related as follows: where: ?p dmaxtotal is the sum of the maximum power dissipation of each amplifier in the package (pd max ) ?pd max for each amplifier can be calculated as follows: where: ?t max = maximum ambient temperature ? ja = thermal resistance of the package ?pd max = maximum power dissipation of 1 amplifier ?v s = supply voltage ?i max = maximum supply current of 1 amplifier ?v outmax = maximum output voltage swing of the application ?r l = load resistance figure 36. preventing oscillations in unused channels - + t jmax t max ja xpd maxtotal () + = (eq. 1) pd max 2*v s i smax v s ( - v outmax ) v outmax r l ---------------------------- + = (eq. 2) isl28156, ISL28256
11 fn6154.3 august 9, 2007 isl28156, ISL28256 sot-23 package family e1 n a d e 4 3 2 1 e1 0.15 d c 2x 0.20 c 2x e b 0.20 m d c a-b b nx 6 2 3 5 seating plane 0.10 c nx 1 3 c d 0.15 a-b c 2x a2 a1 h c (l1) l 0.25 0 +3 -0 gauge plane a mdp0038 sot-23 package family symbol millimeters tolerance sot23-5 sot23-6 a 1.45 1.45 max a1 0.10 0.10 0.05 a2 1.14 1.14 0.15 b 0.40 0.40 0.05 c 0.14 0.14 0.06 d 2.90 2.90 basic e 2.80 2.80 basic e1 1.60 1.60 basic e 0.95 0.95 basic e1 1.90 1.90 basic l 0.45 0.45 0.10 l1 0.60 0.60 reference n 5 6 reference rev. f 2/07 notes: 1. plastic or metal protrusions of 0.25mm maximum per side are not included. 2. plastic interlead protrusions of 0.25mm maximum per side are not included. 3. this dimension is measured at datum plane ?h?. 4. dimensioning and tolerancing per asme y14.5m-1994. 5. index area - pin #1 i.d. will be located within the indicated zone (sot23-6 only). 6. sot23-5 version has no center lead (shown as a dashed line).
12 fn6154.3 august 9, 2007 isl28156, ISL28256 small outline package family (so) gauge plane a2 a1 l l1 detail x 4 4 seating plane e h b c 0.010 b m ca 0.004 c 0.010 b m ca b d (n/2) 1 e1 e n n (n/2)+1 a pin #1 i.d. mark h x 45 a see detail ?x? c 0.010 mdp0027 small outline package family (so) symbol inches tolerance notes so-8 so-14 so16 (0.150?) so16 (0.300?) (sol-16) so20 (sol-20) so24 (sol-24) so28 (sol-28) a 0.068 0.068 0.068 0.104 0.104 0.104 0.104 max - a1 0.006 0.006 0.006 0.007 0.007 0.007 0.007 0.003 - a2 0.057 0.057 0.057 0.092 0.092 0.092 0.092 0.002 - b 0.017 0.017 0.017 0.017 0.017 0.017 0.017 0.003 - c 0.009 0.009 0.009 0.011 0.011 0.011 0.011 0.001 - d 0.193 0.341 0.390 0.406 0.504 0.606 0.704 0.004 1, 3 e 0.236 0.236 0.236 0.406 0.406 0.406 0.406 0.008 - e1 0.154 0.154 0.154 0.295 0.295 0.295 0.295 0.004 2, 3 e 0.050 0.050 0.050 0.050 0.050 0.050 0.050 basic - l 0.025 0.025 0.025 0.030 0.030 0.030 0.030 0.009 - l1 0.041 0.041 0.041 0.056 0.056 0.056 0.056 basic - h 0.013 0.013 0.013 0.020 0.020 0.020 0.020 reference - n 8 14 16 16 20 24 28 reference - rev. m 2/07 notes: 1. plastic or metal protrusions of 0.006? maximum per side are not included. 2. plastic interlead protrusions of 0.010? maximum per side are not included. 3. dimensions ?d? and ?e1? are measured at datum plane ?h?. 4. dimensioning and tolerancing per asme y14.5m - 1994
13 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com fn6154.3 august 9, 2007 isl28156, ISL28256 mini so package family (msop) 1 (n/2) (n/2)+1 n plane seating n leads 0.10 c pin #1 i.d. e1 e b detail x 3 3 gauge plane see detail "x" c a 0.25 a2 a1 l 0.25 c a b d a m b e c 0.08 c a b m h l1 mdp0043 mini so package family symbol millimeters tolerance notes msop8 msop10 a1.101.10 max. - a1 0.10 0.10 0.05 - a2 0.86 0.86 0.09 - b 0.33 0.23 +0.07/-0.08 - c0.180.18 0.05 - d 3.00 3.00 0.10 1, 3 e4.904.90 0.15 - e1 3.00 3.00 0.10 2, 3 e0.650.50 basic - l0.550.55 0.15 - l1 0.95 0.95 basic - n 8 10 reference - rev. d 2/07 notes: 1. plastic or metal protrusions of 0.15mm maximum per side are not included. 2. plastic interlead protrusions of 0.25mm maximum per side are not included. 3. dimensions ?d? and ?e1? are measured at datum plane ?h?. 4. dimensioning and tolerancing per asme y14.5m-1994.

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