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1 ? fn6339.3 isl28288, isl28488 dual and quad micr opower single supply rail-to-rail input a nd output (rrio) op amp the isl28288 and isl28488 are dual and quad channel micropower operational amplif iers 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 suppl y. 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. features ? low power 120a typical supply current ? 1.5mv max offset voltage ? 30pa max input bias current ? 300khz 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 ordering information part number (note) part marking package (pb-free) pkg. dwg. # isl28288fuz 8288z 10 ld msop mdp0043 isl28288fuz-t7* 8288z 10 ld msop tape and reel mdp0043 isl28288fbz 28288 fbz 8 ld soic mdp0027 ISL28288FBZ-T7* 28288 fbz 8 ld soic mdp0027 isl28488faz 28488 faz 16 ld qsop mdp0040 isl28488faz-t7* 28488 faz 16 ld qsop tape and reel mdp0040 isl28488fvz 28488 fvz 14 ld tssop m14.173 isl28488fvz-t7* 28488 fvz 14 ld tssop tape and reel m14.173 isl28288eval1z evaluation board - 10 ld msop isl28488eval1z evaluation board - 16 ld qsop *please refer to tb347 for detai ls on reel specifications. note: these intersil pb-free pl astic packaged products employ special 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 with both snpb and pb-free soldering operations). intersil pb-free products are msl classified at pb-free peak reflow te mperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. data sheet may 22, 2008 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. 2006-2008. all rights reserved all other trademarks mentioned are the property of their respective owners.
2 fn6339.3 may 22, 2008 pinouts 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 - + - + - + - + isl28288, isl28488
3 fn6339.3 may 22, 2008 operating junction absolute maxi mum ratings (t a = +25c) thermal information supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.75v 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 machine model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300v charged device model. . . . . . . . . . . . . . . . . . . . . . . . . . . . .1200v thermal resistance (typical, note 1) ja (c/w) 10 ld msop package . . . . . . . . . . . . . . . . . . . . . . . 160 16 ld qsop package . . . . . . . . . . . . . . . . . . . . . . . 100 8 ld so package . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 14 ld tssop package . . . . . . . . . . . . . . . . . . . . . . 115 output short-circuit duration . . . . . . . . . . . . . . . . . . . . . . .indefinite ambient operating temperature range . . . . . . . . .-40c to +125c storage temperature range . . . . . . . . . . . . . . . . . .-65c to +150c operating junction temperature . . . . . . . . . . . . . . . . . . . . . +125c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/pb-freereflow.asp 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. note: 1. ja is measured with the component mounted on a high effective therma l conductivity test board in free air. see tech brief tb379 f or details. 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. temperature data established by characterization parameter description conditions min (note 2) typ max (note 2) 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 200 190 300 v/mv v o = 0.5v to 4.5v, r l = 1k 60 v/mv v out maximum output voltage swing output low, r l = 100k 36 30 mv output low, r l = 1k 130 175 225 mv output high, r l = 100k 4.990 4.970 4.996 v output high, r l = 1k 4.800 4.750 4.880 v v os time ------------------ v os t --------------- - isl28288, isl28488
4 fn6339.3 may 22, 2008 i s,on quiescent supply current, enabled isl28288, all channels enabled. 120 156 175 a isl28488, all channels enabled. 240 315 350 a i s,off quiescent supply current, disabled (isl28288) 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 300 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 0.12 0.09 0.14 0.16 0.21 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: 2. parts are 100% tested at +25c. temperature limits established by characterizati on and are not production tested. 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. temperature data established by characterization (continued) parameter description conditions min (note 2) typ max (note 2) unit isl28288, isl28488
5 fn6339.3 may 22, 2008 typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open figure 1. frequency response vs supply voltage figure 2. frequency response vs supply voltage figure 3. a vol vs frequency @ 100k load figure 4. a vol vs frequency @ 1k load figure 5. psrr vs frequency f igure 6. 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 rl = 10k v + , v - = 2.5v rl = 1k v + , v - = 1.2v rl = 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 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 10 100 1k 10k 100k frequency (hz) psrr (db) psrr + psrr - v source = 1v p-p r l = 10k v + = 5vdc a v = +1 1m -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 fn6339.3 may 22, 2008 figure 7. current noise vs frequency fi gure 8. voltage noise vs frequency figure 9. 0.1hz to 10hz input voltage nois e figure 10. small signal transient response figure 11. large signal transient response figure 12. enable to output delay time typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open (continued) 0.001 0.01 0.1 1 10 100 1k 10k 100k frequency (hz) input current noise (pa/ hz) 1 0.1 10 100 1k 10k 100k frequency (hz) input voltage noise (nv/ hz) 100 1000 1 10 10000 0.1 -5 -4 -3 -2 -1 0 1 2 3 4 5 012345678910 time (s) 0.1 to 10hz voltage noise (uv) 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 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 isl28288, isl28488
7 fn6339.3 may 22, 2008 figure 13. input offset voltage vs common mode input voltage figure 14. input bias current vs common-mode input voltage figure 15. isl28488 supply current vs temperature v + , v - = 2.5v enabled, r l = inf figure 16. isl28288 supply current vs temperature v + , v - = 2.5v disabled, r l = inf figure 17. v os vs temperature, v in = 0v, v + , v - = 2.5v figure 18. v os vs temperature v in = 0v, v + , v - = 1.2v typical performance curves v + = 5v, v - = 0v, v cm = 2.5v, r l = open (continued) -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 -20 0 20 40 60 80 100 120 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 4.2 4.4 4.6 4.8 -40-200 20406080100120 temperature (c) current (a) n = 12 max min median -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 isl28288, isl28488
8 fn6339.3 may 22, 2008 figure 19. i bias+ vs temperature v + , v - = 2.5v figure 20. i bias - vs temperature v + , v - = 2.5v figure 21. i bias + vs temperature v + , v - = 1.2v figure 22. i bias - vs temperature v + , v - = -1.2v figure 23. i os vs temperature v + , v - = 2.5v figure 24. a vol vs temperature v + , v - = 2.5v, r l = 100k 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) -2500 -2000 -1500 -1000 -500 0 500 n = 1000 min median max i bias+ (pa) -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 max median min -40 -20 0 20 40 60 80 100 120 temperature (c) -2500 -2000 -1500 -1000 -500 0 500 n = 1000 min median max i bias+ (pa) -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 -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 isl28288, isl28488
9 fn6339.3 may 22, 2008 figure 25. a vol vs temperature, v + , v - = 2.5v, r l =1k figure 26. cmrr vs temperature v cm = +2.5v to -2.5v, v + , v - = 2.5v figure 27. psrr vs temperature, v +, v - = 1.2v to 2.75v figure 28. v out high vs temperature, v +, v - = 2.5v, r l = 1k figure 29. v out high vs temperature, v +, v - = 2.5v, r l = 100k figure 30. v out low 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) 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 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 max median -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 max median isl28288, isl28488
10 fn6339.3 may 22, 2008 figure 31. v out low vs temperature, v +, v - = 2.5v, r l = 100k figure 32. +output short circuit current vs temperature v in = +2.5v, r l = 10, v +, v - = 2.5v figure 33. -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) 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 median max min -40 -20 0 20 40 60 80 100 120 temperature (c) 25 27 29 31 33 35 37 39 +output short circuit current n = 1000 min max median (ma) -40-200 20406080100120 temperature (c) -output short circuit current (ma) -33 -31 -29 -27 -25 -23 -21 n = 1000 min max median 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 pi n internal pull-down; logic ?1? selects the disabled state; logic ?0? selects the enabled state. 43 11 13v - 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 isl28288, isl28488
11 fn6339.3 may 22, 2008 applications information introduction the isl28288 and isl28488 are dual and quad cmos rail-to-rail input, output (rri o) 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 120a of supply current. 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 us e 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 another, 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-t o-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 supply rails. there is an additional pair of back-to- back diodes across the input terminals. for applications where the input differential voltage is expected to exceed 0.5v, exte rnal series resistors must be used to ensure the input currents never exceed 5ma. 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 direct ion. 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 package option), 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), 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 amp lifier 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 device will be enabled by default. 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, 9 nc - no internal connection pin descriptions (continued) isl28288 (8 ld soic) isl28288 (10 ld msop) isl28488 (14 ld tssop) isl28488 (16 ld qsop) pin name equivalent circuit description en v + v - v + v - out circuit 3 circuit 1 circuit 2 v + v - circuit 4 in- v + v - in+ capacitively coupled esd clamp isl28288, isl28488
12 fn6339.3 may 22, 2008 using only one channel if the application only require s 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 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 34). 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 circuit board will reduce surface moisture and provide a humidity barrier, reducing parasitic resistance on the board. when input leakage current is a concern, the use of guard rings around the amplifier inputs will further reduce leakage currents. figure 35 shows a guard ring example for a unity gain amplifier that uses the low imp edance amplifier output at the same voltage as the high impedance input to eliminate surface leakage. the guard ring does not need to be a specific width, but it should form a continuous loop around both inputs. for further reduction of leakage currents, components can be mounted to the pc board using teflon standoff insulators. current limiting the isl28288 has no internal current-limiting circuitry. if the output is shorted, it is po ssible 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 +150c 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 paramete rs 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 36) 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 amplifier to run from a single 5v supply. figure 34. preventing oscillations in unused channels - + isl28288 in v + figure 35. guard ring example for unity gain amplifier high impedance input 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) - + 5v + v + v - isl28x88 k type thermocouple 10k r 3 10k r 2 r 4 100k r 1 100k 410v/c figure 36. thermocouple amplifier isl28288, isl28488
13 fn6339.3 may 22, 2008 ecg amplifier ecg amplifiers must extrac t millivolt low frequency ac signals from the skin of the patient while rejecting ac common mode interference and static dc potentials created at the electrode-to-skin interface. in figure 37, 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 amp lifier with the corner frequency given by equation 3: inserting the low pass amplifier, u1b, in u1a?s feedback loop results in an overall high-pass 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 cancelled, 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 correction 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 37, 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 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) 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 37. ecg amplifier r2 - (v + /2) patient lead connector r 10k r 10k isl28288, isl28488
14 fn6339.3 may 22, 2008 isl28288, isl28488 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 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.
15 fn6339.3 may 22, 2008 isl28288, isl28488 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
16 fn6339.3 may 22, 2008 isl28288, isl28488 thin shrink small outlin e plastic packages (tssop) index area e1 d n 123 -b- 0.10(0.004) c a m bs e -a- b m -c- a1 a seating plane 0.10(0.004) c e 0.25(0.010) b m m l 0.25 0.010 gauge plane a2 notes: 1. these package dimensions are wi thin allowable dimensions of jedec mo-153-ac, issue e. 2. dimensioning and tolerancing per ansi y14.5m - 1982. 3. dimension ?d? does not include mold flash, protrusions or gate burrs. mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 4. dimension ?e1? does not include in terlead flash or protrusions. inter- lead flash and protrusions shall not exceed 0.15mm (0.006 inch) per side. 5. the chamfer on the body is optional. if it is not present, a visual index feature must be located within the crosshatched area. 6. ?l? is the length of terminal for soldering to a substrate. 7. ?n? is the number of terminal positions. 8. terminal numbers are shown for reference only. 9. dimension ?b? does not include dam bar protrusion. allowable dambar protrusion shall be 0.08mm (0.003 inch) total in excess of ?b? dimen- sion at maximum material conditi on. minimum space between protru- sion and adjacent lead is 0.07mm (0.0027 inch). 10. controlling dimension: millimete r. converted inch dimensions are not necessarily exact. (angles in degrees) 0.05(0.002) m14.173 14 lead thin shrink small outline plastic package symbol inches millimeters notes min max min max a - 0.047 - 1.20 - a1 0.002 0.006 0.05 0.15 - a2 0.031 0.041 0.80 1.05 - b 0.0075 0.0118 0.19 0.30 9 c 0.0035 0.0079 0.09 0.20 - d 0.195 0.199 4.95 5.05 3 e1 0.169 0.177 4.30 4.50 4 e 0.026 bsc 0.65 bsc - e 0.246 0.256 6.25 6.50 - l 0.0177 0.0295 0.45 0.75 6 n14 147 0 o 8 o 0 o 8 o - rev. 2 4/06
17 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 fn6339.3 may 22, 2008 isl28288, isl28488 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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