View ISL2828811_5780324.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 dual and quad micropower single supply rail-to-rail input and output (rrio) op amp isl28288, isl28488 the isl28288 and isl28488 are dual and quad channel micropower operational amplifiers optimized for single supply operation over the 2.4v to 5.5v range. they can be operated from one lithium cell or two ni-cd batteries. for equivalent performance in a single channel op amp, reference el8188. these devices feature an input range enhancement circuit (irec) which enables them to maintain cmrr performance for input voltages 10% above the positive supply rail and to 100mv below the negative supp ly. the output operation is rail-to-rail. the isl28288 and isl28488 draw minimal supply current while meeting excellent dc-accuracy, ac-performance, noise and output drive specifications. the isl28288 (10 ld msop only) contains a power-down enable pin that reduces the power supply current to typically less than 4a in the disabled state. related literature an1344 : isl2828xeval1z evaluation board user?s guide features ? low power 60a typical su pply current per amplifier ? 1.5mv max offset voltage ? 30pa max input bias current ? 250khz typical gain-bandwidth product ? 105db typical psrr ? 100db typical cmrr ? single supply operation down to 2.4v ? input is capable of swinging above v + and below v - (ground sensing) ? rail-to-rail input and output (rrio) ? enable pin - isl28288 10 ld msop package option only ? pb-free (rohs compliant) applications ? battery- or solar-powered systems ? 4ma to 25ma current loops ? handheld consumer products ?medical devices ? thermocouple amplifiers ? photodiode pre-amps ? ph probe amplifiers figure 1. typical application circuit + - r1 10k 158 + - cf1 4.7f r3 12.4k r4 2.21k v + v + c1 0.1f c3 0.082f vout u1a 1/2 isl28x88 u1b 1/2 isl28x88 rf1 680k r2 vin bandpass amplifier (0.05hz to 159hz) gain=425 vref caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas inc. 2006-2008, 2011. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners. july 26, 2011 fn6339.4
isl28288, isl28488 2 fn6339.4 july 26, 2011 pin configurations isl28288 (8 ld soic) top view isl28488 (14 ld tssop) top view isl28288 (10 ld msop) top view isl28488 (16 ld qsop) top view 1 2 3 4 8 7 6 5 out_a in-_a in+_a v + out_b in-_b v - in+_b + - +- out_a in-_a in+_a v + in+_b in-_b out_b out_d in-_d in+_d v - in+_c in-_c out_c 1 2 3 4 5 6 7 14 13 12 11 10 9 8 + - +- + - +- - + - + in+_a en _a v - en _b in-_a out_a v + out_b in+_b in-_b 1 2 3 4 10 9 8 7 5 6 1 2 3 4 16 15 14 13 5 6 7 12 11 10 8 9 out_a in-_a in+_a v + out_d in-_d in+_d v - in+_b in+_c in-_b out_b in-_c out_c nc nc - + - + - + - + ordering information part number (notes 1, 2, 3) part marking package (pb-free) pkg. dwg. # isl28288fuz 8288z 10 ld msop m10.118a isl28288fbz 28288 fbz 8 ld soic m8.15e isl28488faz (note 4) 28488 faz 16 ld qsop mdp0040 isl28488fvz 28488 fvz 14 ld tssop m14.173 isl28288eval1z evaluation board - 10 ld msop isl28488eval1z evaluation board - 16 ld qsop notes: 1. add ?-t*? suffix for tape and reel. please refer to tb347 for details on reel specifications. 2. these intersil pb-free plastic packaged products employ spec ial pb-free material sets, molding compounds/die attach materials , and 100% matte tin plate plus anneal (e3 termination finish , which is rohs compliant and compatible wi th both snpb and pb-free soldering opera tions). intersil pb-free products are msl classified at pb-fr ee peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jed ec j std-020. 3. for moisture sensitivity level (msl), please see device information page for isl28288, isl28488 . for more information on msl please see techbrief tb363 4. not recommended for new designs.
isl28288, isl28488 3 fn6339.4 july 26, 2011 absolute maximum ratings (t a = +25 c) thermal information supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.75v differential input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5ma differential input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5v input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v - - 0.5v to v + + 0.5v esd tolerance human body model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kv machine model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300v charged device model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200v thermal resistance (typical) ja (c/w) jc (c/w) 8 ld soic package (note5) . . . . . . . . . . . . 125 n/a 10 ld msop package (notes 5, 6) . . . . . . . 160 60 14 ld tssop package (note 5) . . . . . . . . . 115 n/a 16 ld qsop package (note 5) . . . . . . . . . . 100 n/a output short-circuit duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . indefinite storage temperature range. . . . . . . . . . . . . . . . . . . . . . . .-65c to +150c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/ pbfree/pb-freereflow.asp operating conditions ambient operating temperature range . . . . . . . . . . . . . .-40c to +125c maximum operating junction temperature . . . . . . . . . . . . . . . . . .+125c supply voltage . . . . . . . . . . . . . . . . . . . . . . . . 2.4v (1.2v) to 5.5v (2.75v) caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 5. ja is measured with the component mounted on a high effective thermal conductivity test board in free air. see tech brief tb379 for details. 6. for jc , the ?case temp? location is taken at the package top center. 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, r l = open, t a = +25c unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. parameter description conditions min (note 7) typ max (note 7) unit dc specifications v os input offset voltage -1.5 -2 0.05 1.5 2 mv long term input offset voltage stability isl28288 1.2 v/mo input offset voltage vs temperature 0.9 v/c i os input offset current -40c to +85c -30 -80 530 80 pa i b input bias current -40c to +85c -30 -80 10 30 80 pa cmir common-mode voltage range guaranteed by cmrr 05 v cmrr common-mode rejection ratio v cm = 0v to 5v 80 75 100 db psrr power supply rejection ratio v + = 2.4v to 5.5v 85 80 105 db a vol large signal voltage gain v o = 0.5v to 4.5v, r l = 100k 103 102 109 db v o = 0.5v to 4.5v, r l = 1k 95 db v ol output voltage swing, low v out - v - r l = 100k 36 30 mv r l = 1k 130 175 225 mv v os time ----------------- - v os t ------------- -
isl28288, isl28488 4 fn6339.4 july 26, 2011 v oh output voltage swing, high v + - v out r l = 100k 410 30 mv r l = 1k 120 200 250 mv i s,on quiescent supply current, enabled isl28288 per channel, all channels enabled. 60 78 87.5 a isl28488 per channel. 60 79 87.5 a i s,off quiescent supply current, disabled (isl28288 msop) all channels disabled. 4 7 9 a i o + short circuit sourcing capability r l = 10 24 20 31 ma i o - short circuit sinking capability r l = 10 -26 -24 -20 ma v supply supply operating range v + to v - 2.4 5.5 v v en h en pin high level (isl28288 10 ld. msop) 2 v v en l en pin low level (isl28288 10 ld. msop) 0.8 v i en h en pin input high current (isl28288 10 ld. msop) ven = v + 0.8 1 1.5 a i en l en pin input low current (isl28288 10 ld. msop) ven = v - 0 +0.1 a ac specifications gbw gain bandwidth product a v = 100, r f = 100k , r g = 1k , r l = 10k to v cm 250 khz e n input noise voltage peak-to-peak f = 0.1hz to 10hz 3 v p-p input noise voltage density f o = 1khz 48 nv / hz i n input noise current density f o = 1khz 9 fa/ hz cmrr @ 60hz input common mode rejection ratio v cm = 1v p-p , r l = 10k to v cm -70 db psrr+ @ 120hz power supply rejection ratio (v + )v + , v - = 1.2v and 2.5v, v source = 1v p-p , r l = 10k to v cm -80 db psrr- @ 120hz power supply rejection ratio (v - )v + , v - = 1.2v and 2.5v v source = 1v p-p , r l = 10k to v cm -60 db transient response sr slew rate 0.15 v/s t en enable to output turn-on delay time, 10% en to 10% vout (isl28288 10 ld. msop) ven = 5v to 0v, a v = -1, r g = r f = r l = 1k to v cm 2s enable to output turn-off delay time, 10% en to 10% vout (isl28288 10 ld. msop) ven = 0v to 5v, a v = -1, r g = r f = r l = 1k to v cm 0.1 s note: 7. compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design. electrical specifications v + = 5v, v - = 0v, v cm = 2.5v, r l = open, t a = +25c unless otherwise specified. boldface limits apply over the operating temperature range, -40c to +125c. (continued) parameter description conditions min (note 7) typ max (note 7) unit
isl28288, isl28488 5 fn6339.4 july 26, 2011 typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open figure 2. frequency response vs supply voltage figure 3. frequency response vs supply voltage figure 4. a vol vs frequency @ 100k load figure 5. a vol vs frequency @ 1k load figure 6. psrr vs frequency figure 7. cmrr vs frequency v out = 50mv p-p a v = 1 c l = 3pf r f = 0, r g = inf 8 gain (db) -5 -4 -3 0 +1 -2 -1 -7 -6 10k 100k 1m frequency (hz) 1k v + , v - = 2.5v rl = 10k 5m v + , v - = 1.2v r l = 10k v + , v - = 2.5v r l = 1k v + , v - = 1.2v r l = 1k a v = 100 r l = 10k c l = 3pf r f = 100k r g = 1k 0 gain (db) 15 20 25 40 45 30 35 5 10 100 10k 100k 1m frequency (hz ) 1k v + , v - = 1.0v v + , v - = 1.2v v + , v - = 2.5v -80 gain (db) 40 120 80 -40 0 11k100k10m frequency (hz) 10 - 120 phase () 80 40 0 - 40 - 80 10k 1m 100 - 20 gain (db) 0 20 80 100 40 60 10 10k 1m frequency (hz) 100 - 150 phase () 200 150 100 50 0 - 50 - 100 100k 1k phase gain 10 100 1k 10k 100k 1m p s r r ( d b ) frequency (hz) -10 0 10 20 30 40 50 60 70 80 90 100 v s = 2.5v c l = 27.9pf v cm = 1v p-p r l = 10k a v = 1 psrr- psrr+ -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 10 frequency (hz) cmrr (db) 0 v source = 1v p-p r l = 10k v + , v - = 2.5vdc 10 100 1k 10k 100k 1m
isl28288, isl28488 6 fn6339.4 july 26, 2011 figure 8. frequency response vs closed loop gain figure 9. crosstalk vs frequency figure 10. current noise vs frequency figure 11. voltage noise vs frequency figure 12. 0.1hz to 10hz input voltage nois e figure 13. small signal transient response typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open (continued) -10 0 10 20 30 40 50 60 70 1k 10k 100k 1m 10m g a i n ( d b ) frequency (hz) 10 100 a cl = 1 a cl = 10 a cl = 1000 v s = 2.5v c l = 26.9pf v out = 10mv p-p r l = 10k a cl = 100 r f = 100k ? , r g = 10k r f = 0, r g = r f = 100k ? , r g = 1k r f = 100k ? , r g = 100 10 100 1k 10k 100k 1m frequency (hz) 30 40 50 60 70 80 90 100 110 120 130 140 v s = 2.5v c l = 29.6pf v cm = 1v p-p r l _ transmit = r l _ receive = 10k r l _ transmit = 10k r l _ receive = 10k crosstalk (db) 0.1 1 10 100 1k 10k 100k frequency (hz) 1 10 100 1000 v s = 2.5v input noise current (fa/ hz) 0.1 1 10 100 1k 10k 100k frequency (hz) 10 100 1000 10000 v s = 2.5v input noise voltage (nv/ hz) 012345678910 time (s) -5 -4 -3 -2 -1 0 1 2 3 4 5 v s = 2.5v a v = 10k input noise voltage (v) 2.44 2.46 2.48 2.50 2.52 2.54 2.56 0 20 40 60 80 100 120 140 160 180 200 small signal (v) time (s) v + = 5v a v = 1 r l = 1k v out = 0.1v p-p
isl28288, isl28488 7 fn6339.4 july 26, 2011 figure 14. large signal transient response figure 15. enable to output delay time figure 16. input offset voltage vs common mode input voltage figure 17. input bias current vs common-mode input voltage figure 18. isl28488 supply current for all channels vs temperature v + , v - = 2.5v enabled, r l = inf figure 19. isl28288 supply current vs temperature v + , v - = 2.5v disabled, r l = inf typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open (continued) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 20 40 60 80 100 120 140 160 180 200 large signal (v) time (s) v + = 5v a v = -2 r l = 1k v out = 4v p-p 1v/div 0.1v/div 10s/div 0 0 v out en input a v = -1 v in = 200mv p-p v + = 5v v - = 0v -1000 -800 -600 -400 -200 0 200 400 600 800 1000 -10123456 v cm (v) v os (v) v + = 5v r l = open a v = +1000 r f = 100k, r g = 100 -100 -80 -60 -40 -20 0 20 40 60 80 100 -10123456 v cm (v) i bias (pa) v + = 5v r l = open a v = +1000 r f = 100k, r g = 100 -40-200 20406080100120 temperature (c) 170 190 210 230 250 270 290 310 330 350 current (a) min max n = 1000 median 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 -40 -20 0 20 40 60 80 100 120 temperature (c) current (a) n = 12 max min median
isl28288, isl28488 8 fn6339.4 july 26, 2011 figure 20. v os vs temperature, v in = 0v, v + , v - = 2.5v figure 21. v os vs temperature v in = 0v, v + , v - = 1.2v figure 22. i bias+ vs temperature v + , v - = 2.5v figure 23. i bias - vs temperature v + , v - = 2.5v figure 24. i bias + vs temperature v + , v - = 1.2v figure 25. i bias - vs temperature v + , v - = -1.2v typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open (continued) -40-200 20406080100120 temperature (c) -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 v os (mv) min median max n = 1000 -40 -20 0 20 40 60 80 100 120 temperature (c) -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 v os (mv) n = 1000 min median max -40-200 20406080100120 temperature (c) -2500 -2000 -1500 -1000 -500 0 500 n = 1000 i bias+ (pa) min median max -40 -20 0 20 40 60 80 100 120 temperature (c) -1400 -1200 -1000 -800 -600 -400 -200 0 200 i bias- (pa) n = 1000 min median max -40-20 0 20406080100120 temperature (c) -2500 -2000 -1500 -1000 -500 0 500 n = 1000 i bias+ (pa) min median max -40 -20 0 20 40 60 80 100 120 temperature (c) -1200 -1000 -800 -600 -400 -200 0 200 n = 1000 i bias- (pa) min median max
isl28288, isl28488 9 fn6339.4 july 26, 2011 figure 26. i os vs temperature v + , v - = 2.5v figure 27. a vol vs temperature v + , v - = 2.5v, r l = 100k figure 28. a vol vs temperature, v + , v - = 2.5v, r l =1k figure 29. cmrr vs temperature v cm = +2.5v to -2.5v, v + ,v - = 2.5v figure 30. psrr vs temperature, v +, v - = 1.2v to 2.75v figure 31. v out high vs temperature, v +, v - = 2.5v, r l = 1k typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open (continued) -40 -20 0 20 40 60 80 100 120 temperature (c) -1400 -1200 -1000 -800 -600 -400 -200 0 200 i os (pa) n = 1000 min median max -40 -20 0 20 40 60 80 100 120 temperature (c) 150 200 250 300 350 400 450 500 550 600 650 a vol (v/mv) n = 1000 min median max -40 -20 0 20 40 60 80 100 120 temperature (c) 30 40 50 60 70 80 90 a vol (v/mv) n = 1000 min median max -40 -20 0 20 40 60 80 100 120 temperature (c) 75 85 95 105 115 125 135 cmrr (db) n = 1000 min median max -40 -20 0 20 40 60 80 100 120 temperature (c) 80 90 100 110 120 130 140 psrr (db) n = 1000 min median max -40 -20 0 20 40 60 80 100 120 temperature (c) 4.84 4.85 4.86 4.87 4.88 4.89 4.90 4.91 v out (v) n = 1000 min median max
isl28288, isl28488 10 fn6339.4 july 26, 2011 figure 32. v out high vs temperature, v +, v - = 2.5v, r l = 100k figure 33. v out low vs temperature, v +, v - = 2.5v, r l = 1k figure 34. v out low vs temperature, v +, v - = 2.5v, r l = 100k figure 35. +output short circuit current vs temperature v in = +2.5v, r l = 10, v +, v - = 2.5v figure 36. -output short circuit current vs temperature v in = -2.5v, r l = 10, v +, v - = 2.5v typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open (continued) 4.9964 4.9966 4.9968 4.9970 4.9972 4.9974 4.9976 4.9978 4.9980 4.9982 4.9984 -40 -20 0 20 40 60 80 100 120 temperature (c) vout (v) n = 12 min median max -40 -20 0 20 40 60 80 100 120 temperature (c) 100 110 120 130 140 150 160 170 v out (mv) n = 1000 min median max 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 -40 -20 0 20 40 60 80 100 120 temperature (c) v out (mv) n = 12 min median max -40-20 0 20406080100120 temperature (c) 25 27 29 31 33 35 37 39 +output short circuit current n = 1000 (ma) min median max -40-200 20406080100120 temperature (c) -output short circuit current (ma) -33 -31 -29 -27 -25 -23 -21 n = 1000 min median max
isl28288, isl28488 11 fn6339.4 july 26, 2011 applications information introduction the isl28288 and isl28488 are dual and quad cmos rail-to-rail input, output (rrio) micropower operational amplifiers. these devices are designed to operate from a single supply (2.4v to 5.5v) or dual supplies (1.2v to 2.75v) while drawing only 60a of supply current per amplifier. this combination of low power and precision performance makes these devices suitable for solar and battery power applications. rail-to-rail input many rail-to-rail input stages use two differential input pairs, a long-tail pnp (or pfet) and an npn (or nfet). severe penalties have to be paid for this circuit topology. as the input signal moves from one supply rail to anothe r, the operational amplifier switches from one input pair to the other causing drastic changes in input offset voltage and an undesired change in magnitude and polarity of input offset current. these amplifiers achieve rail-to-rail input operation without sacrificing important precision specifications and degrading distortion performance. the devices? input offset voltage exhibits a smooth behavior throughout the entire common-mode input range. the input bias current vs the common-mode voltage range gives us an undistorted behavior from typically 100mv below the negative rail and 10% higher than the v + rail (0.5v higher than v + when v + equals 5.5v). 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 suppl y rails. there is an additional pair of back-to-back diodes ac ross the input terminals. for applications where the input differential voltage is expected to pin descriptions isl28288 (8 ld soic) isl28288 (10 ld msop) isl28488 (14 ld tssop) isl28488 (16 ld qsop) pin name equivalent circuit description 3 1 3 3 in+_a circuit 1 amplifier a non-inverting input -2 - -en _a circuit 2 amplifier a enable pin internal pull-down; logic ?1? selects the disabled state; logic ?0? selects the enabled state. 4 3 11 13 v - circuit 4 negative power supply -4 - -en _b circuit 2 amplifier b enable pin with internal pull-down; logic ?1? selects the disabled state; logic ?0? selects the enabled state. 5 5 5 5 in+_b circuit 1 amplifier b non-inverting input 6 6 6 6 in-_b circuit 1 amplifier b inverting input 7 7 7 7 out_b circuit 3 amplifier b output 88 4 4v + circuit 4 positive power supply 1 9 1 1 out_a circuit 3 amplifier a output 2 10 2 2 in-_a circuit 1 amplifier a inverting input - - 8 10 out_c circuit 3 amplifier c output - - 9 11 in-_c circuit 1 amplifier c inverting input - - 10 12 in+_c circuit 1 amplifier c non-inverting input - - 12 14 in+_d circuit 1 amplifier d non-inverting input - - 13 15 in-_d circuit 1 amplifier d inverting input - - 14 16 out_d circuit 3 amplifier d output -- -8, 9nc-no internal connection en v + v - v + v - out circuit 3 circuit 1 circuit 2 v + v - circuit 4 in- v + v - in+ capacitively coupled
isl28288, isl28488 12 fn6339.4 july 26, 2011 exceed 0.5v, external series resist ors must be used to ensure the input currents never exceed 5ma (as shown in figure 37). rail-to-rail output a pair of complementary mosfet devices are used to achieve the rail-to-rail output swing. the nmos sinks current to swing the output in the negative direction. the pmos sources current to swing the output in the positive direction. with a 100k load they will swing to within 4mv of the positive supply rail and within 3mv of the negative supply rail. enable/disable feature the isl28288 (only msop pack age option), offers an en pin that disables the device when pulled up to at least 2.0v. in the disabled state (output in a hi gh impedance state), the part consumes typically 4a. by disabling the part, multiple isl28288 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 loading effects of the feedback resistors of the disabled amplifier must be considered when multiple amplifier outputs are connected together. the en pin also has an internal pull-down. if left open, the en pin will pull to the negative rail and the devi ce will be enabled by default. using only one channel if the application only requires one channel, the user must configure the unused channel to prevent it from oscillating. the unused channel will oscillate if the input and output pins are floating. this will result in high er 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 38). proper layout maximizes performance to achieve the maximum performance of the high input impedance and low offset voltage, care should be taken in the circuit board layout. the pc board surface must remain clean and free of moisture to avoid leakage currents between adjacent traces. surface coating of the ci rcuit board will reduce surface moisture and provide a humidity barrier, reducing parasitic resistance on the board. current limiting the isl28288 has no internal current-limiting circuitry. if the output is shorted, it is possibl e to exceed the absolute maximum rating for output current or power dissipation, potentially resulting in the destru ction of the device. power dissipation it is possible to exceed the +150c maximum junction temperatures under certain load and power-supply conditions. it is therefore important to ca lculate 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 in equation 1: where: ?p dmaxtotal is the sum of the maximum power dissipation of each amplifier in the package (pd max ) ?pd max for each amplifier is calculated in equation 2: where: ?t max = maximum ambient temperature ? ja = thermal resistance of the package ?pd max = maximum power dissipation of 1 amplifier ?v s = supply voltage (magnitude of v + and v - ) ?i max = maximum supply current of 1 amplifier ?v outmax = maximum output voltage swing of the application ?r l = load resistance application circuits thermocouple amplifier thermocouples are the most popular temperature-sensing device because of their low cost, interchangeability, and ability to measure a wide range of temperatures. the isl28x88 (see figure 39) is used to convert the differential thermocouple voltage into single-ended signal with 10x gain. the amplifier?s rail-to-rail input characteristic allows the thermocouple to be biased at ground and the amplif ier to run from a single 5v supply. figure 37. input esd diode current limiting - unity gain - + r in r l v in v out v+ v- figure 38. preventing oscillations in unused channels - + isl28288 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)
isl28288, isl28488 13 fn6339.4 july 26, 2011 ecg amplifier ecg amplifiers must extract millivolt low frequency ac signals from the skin of the patient wh ile rejecting ac common mode interference and static dc potentials created at the electrode-to- skin interface. in figure 40, the isl28288 (u1) forms one of the multiple high gain ac band-pass amplifiers using active feedback. amplifier u1b and rc rf1, cf1 form a high gain lp filtered amplifier with the corner frequency given by equation 3: inserting the low pass amplifier, u1b, in u1a?s feedback loop results in an overall high-pa ss frequency response. voltage divider pairs r1-r2 and r3-r4 set the overall amplifier pass- band gain. the dc input offset is cancelled by u1b at u1a?s inverting input. resistor divider pair, r3-r4 define the maximum input dc level that is cancelle d, and is given by equation 4: in the passband range, u1b?s gain is +1 and the total signal gain is defined by the divider ratios according to equation 5: at frequencies greater than the lpf corner, the r1-c1 and r3-c3 networks roll off u1a's gain to unity. setting both r-c time constants to the same value simplifies to equation 6: right leg drive and reference amplifiers u2a and u2b form a dc feedback loop that applies a co rrection voltage at the right leg electrode to cancel out dc and low frequency body interference. the voltage at the v cm sense electrode is maintained at the reference voltage set by rf1-rf2. with the values shown in figure 40, the ecg circuit performance parameters are: 1. supply voltage range = +2.4v to +5.5v 2. total supply current draw @ +5v = 500a (typ) 3. common-mode reference voltage (v cm ) = v + /2 4. max dc input offset voltage = v cm 0.18v to 0.41v 5. passband gain = 425v/v 6. lower -3db frequency = 0.05hz 7. upper -3db frequency = 159hz - + 5v + v + v - isl28x88 10k r 3 10k r 2 r 4 100k r 1 100k 410v/c figure 39. thermocouple amplifier cold junction compensation k type thermocouple f-hpf -3db 1 2pi rf1 cf1 ------------------------------------------------- - = (eq. 3) v in dc v + r 4 r 3 r 4 + -------------------- ?? ?? ?? = (eq. 4) v out u1 gain v out v in ------------ - r 1 r 2 + r 2 -------------------- ?? ?? ?? r 3 r 4 + r 4 -------------------- ?? ?? ?? = = (eq. 5) f-lpf -3db 1 2pi r 1 c 1 ----------------------------------------- = (eq. 6)
isl28288, isl28488 14 intersil products are manufactured, assembled and tested utilizing iso9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality intersil products are sold by description only. intersil corporat ion 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 furnished by intersil is believed to be accurate and reliable. however, no responsi bility is assumed by intersil or its subsid iaries for its use; nor for any infringem ents of patents 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 i ntersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com fn6339.4 july 26, 2011 for additional products, see www.intersil.com/product_tree vref input rl drive v + r 500k r 5k v cm sense + - r1 10k 158 + - cf1 4.7f r3 12.4k r4 2.21k v + v + c1 0.1f c3 0.082f r 1k vout(u1) u1a 1/2 isl28288 u1b 1/2 isl28288 vout+ vout- vin+ v cm reference to other channels v + protection circuit c 0.01f supply common +2.4 to 5.5v supply v + 0.47 f 4.7f + u2a 1/2 isl28288 v + v + u2b 1/2 isl28288 ca 1nf cb 1nf - + v + v cm rfb 10k rfa 10k r 10k patient electrode pads dc offset rf1 680k figure 40. ecg amplifier r2 - (v + /2) patient lead connector r 10k r 10k
isl28288, isl28488 15 fn6339.4 july 26, 2011 revision history the revision history provided is for inform ational purposes only and is believed to be accurate, but not warranted. please go t o web to make sure you have the latest revision. date revision change 7/12/11 fn6339.4 page 1 features changed: "low power 120ua?" to "low power 60ua?" page 4 electrical spec table is,on changed conditions and values from: isl28288, all channels enabled typ 120, max 156, 175 isl28488, all channels enabled typ 240, max 315, 350 to: isl28288, per channel, all channels enabled typ 60, max 78, 87.5 isl28488, per channel typ 60, max 79, 87.5 page 4 electrical spec table is,off updated description by adding msop to isl28288 page 11 first paragraph second sentence of the app lications information introduction section changed "?while drawing only 120ua of supply current." to "?wh ile drawing only 60ua of supply current per amplifier." 6/16/11 features on page 1 changed gain bw from 300 to 250khz added related literature added typ app circuit updated pkg dwg number to ordering information on page 2 for: isl28288fbz from mdp0027 to m8.15e, matching intrepid isl28288fuz from mdp0043 to m10.118a added note "not recommended for new designs" for isl28488faz (at prenotification) removed "supply turn on voltage slew rate . . . . . . . . . . . . . . . . . . . . . 1v/s" from abs max on page 3 added "supply voltage under operating conditions. . . . . . . . . . . . . . . . . . 2.4v (1.2v) to 5.5v (2.75v)" avol room temp on page 3 min changed from 200v/mv to 103db; over temp min changed from 190v/mv to 102db; typ changed from 300v/mv to 109db. for rl = 1kohm, changed typ from 60v/mv to 95db vout split into 2 parameters; vol and voh beginning onpage 3. for output voltage swing, high, removed min specs, changed typs from 4.996v & 4.880v to 4 & 120mv; added max specs added tjc note on page 3 changed gbw typ from 300khz to 250khz page 4 removed min/max limits for sr page 4. chan ged typ from +/-0.14v/us to +/-0.15v/us changed note in electrical spec table page 4 from: parts are 100% tested at +25c. temperature limits established by characterization and are not production tested. to: compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design revised figure 6. psrr vs frequency on page 5 added figures 8-11 frequency curves beginning on page 6 updated proper layout maximizes performance sectionpage 12 by removing last part of paragraph and figure replaced mdp0027 pod with updated m8.15e to meet new standard replaced m14.173 pod with updated version - updated drawing to remove table and added land pattern replaced mdp0043 pod with m10.118a to meet new standard 5-22-08 fn6339.3 removed "coming soon" in ordering information, updated pb-free lead finish note to latest revision. 3-17-08 fn6339.2 1. added 8ld. so, 14 ld t ssop package, pinout, and pin description. 2. changed io+, io- specs 3. updated abs max supply voltage, theta jas, added cdm esd spec 4. changed spec. table noise current typ from 0.1pa to 9fa 5. updated noise plots (fig.7, 8, 9) 6. updated transient response plots (fig 10, 11) 7. added ecg circuit to applications section 6-28-07 fn6339.1 applied all intersil standards. added new part to datasheet. changed caution statement per legal's suggested verbiage. ordering information updated - added tape and reel note. added note 1 to spec table for min and max. updated pod's. 6/25/07 following edits completed: 1) datasheet description 3rd paragraph, last sentence. changed "less than 10a max" to "typically 4a" 2) datasheet description 3rd paragraph, last sentence. change "the reduces the power" to "that reduces the power". 3) features change "60a to 120a typ supply current" remove per amplifier. 4) change to "30pa max". 5) change to 105 typical psrr. 6) add 100 typical cmrr. 7) pa ge 2, iio 80pa max limit for hot/cold temp 9-20-06 fn6339.0 initial release
isl28288, isl28488 16 fn6339.4 july 26, 2011 products intersil corporation is a leader in the design and manufacture of high-performance analog semico nductors. the company's product s address some of the industry's fastest growing markets, such as , flat panel displays, cell phones, handheld products, and noteb ooks. intersil's product families address power management and analog sign al processing functions. go to www.intersil.com/products for a complete list of intersil product families. *for a complete listing of applications, related documentation an d related parts, please see the respective device information page on intersil.com: isl28288, isl28488 to report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff fits are available from our website at: http://rel.intersil.co m/reports/search.php
isl28288, isl28488 17 fn6339.4 july 26, 2011 quarter size outline plast ic packages family (qsop) 0.010 c a b seating plane detail x e e1 1 (n/2) (n/2)+1 n pin #1 i.d. mark b 0.004 c c a see detail "x" a2 44 gauge plane 0.010 l a1 d b h c e a 0.007 c a b l1 mdp0040 quarter size outline plastic packages family symbol inches tolerance notes qsop16 qsop24 qsop28 a 0.068 0.068 0.068 max. - a1 0.006 0.006 0.006 0.002 - a2 0.056 0.056 0.056 0.004 - b 0.010 0.010 0.010 0.002 - c 0.008 0.008 0.008 0.001 - d 0.193 0.341 0.390 0.004 1, 3 e 0.236 0.236 0.236 0.008 - e1 0.154 0.154 0.154 0.004 2, 3 e 0.025 0.025 0.025 basic - l 0.025 0.025 0.025 0.009 - l1 0.041 0.041 0.041 basic - n 16 24 28 reference - rev. f 2/07 notes: 1. plastic or metal protrusions of 0.006? maximum per side are not in- cluded. 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.
isl28288, isl28488 18 fn6339.4 july 26, 2011 package outline drawing m8.15e 8 lead narrow body small outline plastic package rev 0, 08/09 unless otherwise specified, tolerance : decimal 0.05 the pin #1 identifier may be either a mold or mark feature. interlead flash or protrusions shall not exceed 0.25mm per side. dimension does not include interlead flash or protrusions. dimensions in ( ) for reference only. dimensioning and tolerancing conform to amse y14.5m-1994. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: detail "a" side view ?a typical recommended land pattern top view a b 4 4 0.25 a mc b c 0.10 c 5 id mark pin no.1 (0.35) x 45 seating plane gauge plane 0.25 (5.40) (1.50) 4.90 0.10 3.90 0.10 1.27 0.43 0.076 0.63 0.23 4 4 detail "a" 0.22 0.03 0.175 0.075 1.45 0.1 1.75 max (1.27) (0.60) 6.0 0.20 reference to jedec ms-012. 6. side view ?b?
isl28288, isl28488 19 fn6339.4 july 26, 2011 package outline drawing m14.173 14 lead thin shrink small outline package (tssop) rev 3, 10/09 detail "x" side view typical recommended land pattern top view b a 17 8 14 c plane seating 0.10 c 0.10 c b a h pin #1 i.d. mark 5.00 0.10 4.40 0.10 0.25 +0.05/-0.06 6.40 0.20 c b a 0.05 0-8 gauge plane see 0.90 +0.15/-0.10 0.60 0.15 0.09-0.20 5 2 3 1 3 1.00 ref 0.65 1.20 max 0.25 0.05 min 0.15 max (1.45) (5.65) (0.65 typ) (0.35 typ) detail "x" 1. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 per side. 2. dimension does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 per side. 3. dimensions are measured at datum plane h. 4. dimensioning and tolerancing per asme y14.5m-1994. 5. dimension does not include dambar protrusion. allowable protrusion shall be 0.80mm total in excess of dimension at maximum material condition. minimum space between protrusion and adjacent lead is 0.07mm. 6. dimension in ( ) are for reference only. 7. conforms to jedec mo-153, variation ab-1. notes: end view
isl28288, isl28488 20 fn6339.4 july 26, 2011 package outline drawing m10.118a (jedec mo-187-ba) 10 lead mini small outline plastic package (msop) rev 0, 9/09 plastic or metal protrusions of 0.15mm max per side are not dimensions ?d? and ?e1? are measured at datum plane ?h?. this replaces existing drawing # mdp0043 msop10l. plastic interlead protrusions of 0.25mm max per side are not dimensioning and tolerancing conform to amse y14.5m-1994. 6. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: detail "x" side view 1 typical recommended land pattern top view gauge plane 33 0.25 0.25 c a b a b 0.10 c 0.08 c a b 0.55 0.15 0.95 bsc 0.18 0.05 1.10 max c h 5.80 3.00 4.40 0.50 0.30 1.40 pin# 1 id 1 2 10 detail "x" seating plane 0.5 bsc 0.23 +0.07/ -0.08 3.0 0.1 4.9 0.15 3.0 0.1 0.10 0.05 0.86 0.09 side view 2 included. included.

▲Up To Search▲

Price & Availability of ISL2828811

	To Download ISL2828811 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .