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1 ? fn6263.1 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. isl55191, isl55291 single and dual ultra- low noise, ultra-low distortion, rail-to-ra il, low power op amp the isl55191 and isl55291 are single and dual high speed operational amplifiers featuring low noise, low distortion, and rail-to-rail output drive capability. they are designed to operate with single and dual supplies from +5vdc (2.5vdc) down to +3vdc (1.5vdc). these amplifiers draw 6.1ma of quiescent supply current per amplifier. for power conservation, this family offers a low-power shutdown mode that reduces supply curr ent to 21a and places the amplifiers' output into a high impedance state. the isl55191 enable logic places the device in the shutdown mode with en = 0 and the isl55291 is placed in the shutdown mode with en = 1. these amplifiers have excellent input and output overload recovery times and outputs that swing rail-to-rail. their input common mode voltage range includes ground. the isl55191 and isl55291 are stable at gains as low as 10 with an input referred noise voltage of 1.3nv/ hz and harmonic distortion products -94dbc (2nd) and -104dbc (3rd) below a 1mhz 2v p-p signal. the isl55191 is available in space-saving 8 ld dfn and 8 ld soic packages. the isl55291 is available in a 10 ld msop package. features ? 1.3nv/ hz input voltage noise, f o = 1khz ? harmonic distortion -94dbc, -104dbc, f o = 1mhz ? stable at gains as low as 10 ? 800mhz gain bandwidth product (a v = 10) ? 260v/s slew rate ? 6.1ma supply current (21a in disable mode) ? 800v maximum offset voltage ? 12a input bias current ? 3v to 5.5v single supply voltage range ? rail-to-rail output ? pb-free plus anneal available (rohs compliant) applications ? high speed pulse applications ? low noise signal processing ? adc buffers ? dac output amplifiers ? radio systems ? portable equipment ordering information part number (note) part marking tape and reel package (pb-free) pkg. dwg. # isl55191ibz 55191 ibz - 8 ld soic mdp0027 isl55191ibz-t13 55191 ibz 13? (2,500 pcs) 8 ld soic tape and reel mdp0027 isl55191irz 191z - 8 ld dfn l8.3x3d isl55191irz-t13 191z 13? (2,500 pcs) 8 ld dfn tape and reel l8.3x3d ISL55291IUZ 5291z - 10 ld msop mdp0043 ISL55291IUZ-t13 5291z 13? (2,500 pcs) 10 ld msop tape and reel mdp0043 coming soon isl55191eval1z evaluation board coming soon isl55291eval1z evaluation board 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 classified at pb-f ree peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. table 1. enable logic enable disable isl55191 en = 1 en = 0 isl55291 en = 0 en = 1 data sheet march 30, 2007
2 fn6263.1 march 30, 2007 isl55191, isl55291 pinouts isl55191 (8 ld soic) top view isl55191 (8 ld dfn) top view isl55291 (10 ld msop) top view 1 2 3 4 8 7 6 5 - + feedback in- in+ v- en v+ out nc 2 3 4 1 7 6 5 8 en feedback in- in+ v + out nc v- - + 1 2 3 4 10 9 8 7 5 6 out_a in-_a in+_a v- v+ out_b in-_b in+_b en _a en _b - + 7 - +
3 fn6263.1 march 30, 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 esd rating human body model (per mil-std-883 method 3015.7) . . . . .3kv machine model (per eiaj ed-4701 method c-111) . . . . . . . .300v thermal resistance ja (c/w) 8 ld dfn package . . . . . . . . . . . . . . . . . . . . . . . . . tbd 8 ld so package . . . . . . . . . . . . . . . . . . . . . . . . . . 110 8 ld msop package . . . . . . . . . . . . . . . . . . . . . . . . 115 ambient operating temperature range . . . . . . . . . .-40c to +85c 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: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. 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- = gnd, r l = 1k , r g = 30 , r f = 270 . unless otherwise specified. parameters are per amplifier. all values are at v+ = 5v, t a = +25c. parameter description conditions min typ max unit dc specifications v os input offset voltage 170 800 v input offset drift vs temperature -40c to +85c 2.2 v/c i os input offset current 0.3 0.7 a i b input bias current -12 -19 a v cm common-mode voltage range 0 3.8 v cmrr common-mode rejection ratio v cm = 0v to 3.8v 85 100 db psrr power supply rejection ratio v+ = 3v to 5v 70 77 db a vol large signal voltage gain v o = 0.5v to 4v, r l = 1k 85 97 db v out maximum output voltage swing output low, r l = 1k connected to v+/2 23 40 mv output high, r l = 1k connected to v+/2 4.96 4.98 v i s,on supply current, enabled isl55191 6.1 9 ma isl55291 12 18 ma i s,off supply current, disabled 21 40 a i o + short-circuit output current r l = 10 connected to v+/2 110 132 ma i o - short-circuit output current r l = 10 connected to v+/2 110 132 ma v supply supply operating range v+ to v- 3 5 v v inh enable high level 2v v inl enable low level 0.8 v i enh enable input high current v en = v+ isl55191 (en) 20 80 na isl55291 (en )0.81.5a i enl enable input low current v en = v- isl55191 (en) 5 6.2 a isl55291 (en )2080na v os t --------------- - isl55191, isl55291
4 fn6263.1 march 30, 2007 ac specifications gbw gain bandwidth product a v = +10; v out = 100mv p-p ; r f /r g = 909 / 100 800 mhz hd (4mhz) 2nd harmonic distortion a v = +10; v out = 2v p-p ; r f /r g = 909 / 100 -94 dbc 3rd harmonic distortion -104 dbc iso off-state isolation; en = 1 isl55291; en = 0 isl55191 f o = 10mhz; a v = +10; v in = 640mv p-p ; r f /r g = 909 / 100 ; c l = 1.2pf -65 db x-talk isl55291 channel to channel crosstalk f o = 10mhz; a v = +10; v out (driven channel) = 640mv p-p ; r f /r g = 909 / 100 ; c l = 1.2pf -75 db v n input referred voltage noise f o = 1khz 1.2 nv/ hz in input referred current noise f o = 10khz 3.8 pa/ hz transient response sr slew rate 150 260 v/us t r , t f large signal rise time, t r 10% to 90% a v = +10; v out = 3.5v p-p ; r f /r g = 909 /100 c l = 1.2pf 6.6 ns fall time, t f 10% to 90% 5.7 ns rise time, t r 10% to 90% a v = +10; v out = 1v p-p ; r f /r g = 909 / 100 c l = 1.2pf 5ns fall time, t f 10% to 90% 4ns t r , t f , small signal rise time, t r 10% to 90% a v = +10; v out = 100mv p-p ; r f /r g = 909 / 100 c l = 1.2pf 3ns fall time, t f 10% to 90% 3ns t pd propagation delay 10% v in to 10% v out a v = +10; v out = 100mv p-p ; r f /r g = 909 / 100 c l = 1.2pf 1.6 ns t iol positive input overload recovery time, t iol+ ; 10% v in to 10% v out v s = 2.5v; a v = +10; v in = +v cm +0.5v; r f /r g = 909 / 100 ; c l = 1.2pf 50 ns negative input overload recovery time, t iol- ; 10% v in to 10% v out v s = 2.5v; a v = +10; v in = -v -0.5v; r f /r g = 909 / 100 ; c l = 1.2pf 30 ns t ool positive output overload recovery time, t ool+ ; 10% v in to 10% v out v s = 2.5v; a v = +10; v in = 2.3v p-p ; r f /r g = 909 / 100 ; c l = 1.2pf 40 ns negative output overload recovery time, t ool- ; 10% v in to 10% v out v s = 2.5v; a v = +10; v in = 2.3v p-p ; r f /r g = 909 / 100 ; c l = 1.2pf 30 ns t en isl55191 enable to output turn-on delay time; 10% en to 10% v out a v = +10; v in = 500mv p-p ; r f /r g = 909 / 100 c l = 1.2pf 540 ns enable to output turn-off delay time; 10% en to 10% v out a v = +10; v in = 500mv p-p ; r f /r g = 909 / 100 c l = 1.2pf 390 ns t en isl55291 enable to output turn-on delay time; 10% en to 10% v out a v = +10; v in = 500mv p-p ; r f /r g = 909 / 100 c l = 1.2pf 330 ns enable to output turn-off delay time;10% en to 10% v out a v = +10; v in = 500mv p-p ; r f /r g = 909 / 100 c l = 1.2pf 50 ns electrical specifications v + = 5v, v- = gnd, r l = 1k , r g = 30 , r f = 270 . unless otherwise specified. parameters are per amplifier. all values are at v+ = 5v, t a = +25c. parameter description conditions min typ max unit isl55191, isl55291
5 fn6263.1 march 30, 2007 typical performance curves figure 1. gain vs frequency for various r f vs r g figure 2. gain vs frequency vs v out figure 3. gain vs frequency for various r load figure 4. closed loop gain vs frequency figure 5. gain vs frequency vs v s figure 6. gain vs frequency for various c load -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 frequency (mhz) normalized gain (db) r f = 133, r g = 14.7 a v = 10 r l = 1k v out = 100mv p-p r f = 249, r g = 27.4 r f = 274, r g = 30.1 r f = 316, r g = 34.8 r f = 365, r g = 40.2 r f = 2.74k, r g = 301 r f = 909, r g = 100 .01 0.1 1.0 10 100 1k -8 -7 -6 -5 -4 -3 -2 -1 0 1 frequency (mhz) normalized gain (db) v out = 1v v out = 100mv v out = 200mv a v = 10 r l = 1k c l = 1.3pf r f = 909 r g = 100 1.0 10 100 1k 0.1 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 frequency (mhz) normalized gain (db) r l = 250 r l = 500 r l = 1k c l = 1.3pf v out = 100mv p-p a v = 10 r l = 100 .01 0.1 1.0 10 100 1k 0 5 10 15 20 25 30 35 40 45 50 55 60 65 frequency (mhz) gain (db) a v = 1000 r f /r i = 100k/100 a v = 10 r f /r i = 909/100 0.1 1.0 10 100 1k r l = 1k c l = 2.2pf v out = 100mv p-p a v = 100 r f /r i = 10k/100 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 normalized gain (db) frequency (mhz) v s = 1.2v v s = 2.5v c g = 0.5pf r f = 909 r g = 100 r l = 1k v out = 100mv p-p .01 0.1 1.0 10 100 1k -6 -5 -4 -3 -2 -1 0 1 2 3 4 frequency (mhz) normalized gain (db) c l = 23.2pf c l = 13.2pf c l = 2.2pf c l = 1.2pf c l = 8.0pf c l = 4.5pf a v = 10 v + = 5v r l = 1k v out = 100mv p-p 0.1 10 100 1k 0.1 isl55191, isl55291
6 fn6263.1 march 30, 2007 figure 7. isl55191 gain vs frequency for various c g figure 8. isl55291 gain vs frequency for various c g figure 9. disabled input impedance vs frequency figure 10. enabled input impedance vs frequency figure 11. disabled output impedance vs frequency figure 12. enabled output impedance vs frequency typical performance curves (continued) -5 -4 -3 -2 -1 0 1 2 3 4 5 frequency (mhz) normalized gain (db) .01 0.1 1.0 10 100 1k c g = 3.0pf c g = 5.5pf c g = 0.8pf c g = 10.8pf c g = 9.0pf c g = 7.6pf r f = 909 r g = 100 a v = 10 r l = 1k v out = 100mv p-p v s = 5v c g = 12.8pf frequency (mhz) normalized gain (db) c g = 8.7pf c g = 1.6pf c g = 2.7pf c g = 0.5pf c g = 7.3pf c g = 5.2pf c g = 3.8pf r f = 909 r g = 100 a v = 10 r l = 1k v out = 100mv p-p v s = 5v .01 0.1 1.0 10 100 1k -5 -4 -3 -2 -1 0 1 2 3 4 5 1 10 100 1k 10k 100k 1m frequency (mhz) disabled input impedance ( ) c g = 1.6pf c l = 1.2pf a v = 10 r f = 909 r g = 100 v source = 500mv p-p r l = 1k .01 0.1 1.0 10 100 1k frequency (mhz) enabled input impedance ( ) c g = 1.6pf c l = 1.2pf a v = 10 r f = 909 r g = 100 v source = 500mv p-p r l = 1k .01 0.1 1.0 10 100 1k 1 10 100 1k 10k 100k 1m 10 100 1k 10k impedance ( ) frequency (mhz) c g = 0.5pf r f = 909 r g = 100 a v = 10 v source = 1v p-p .01 0.1 1.0 10 100 1k 0.01 0.1 1 10 100 output impedance ( ) frequency (mhz) c g = 0.5pf r f = 909 r g = 100 a v = 10 v source = 1v p-p .01 0.1 1.0 10 100 1k isl55191, isl55291
7 fn6263.1 march 30, 2007 figure 13. cmrr vs frequency figure 14. psrr vs frequency figure 15. off isolation vs frequency figu re 16. isl55291 channel to channel crosstalk vs frequency figure 17. input voltage noise vs frequency figure 18. input current noise vs frequency typical performance curves (continued) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 frequency (mhz) cmrr (db) .01 0.1 1.0 10 100 1k a v = 10 c g = 0.8pf r l = 1k r g = 100 rf = 909 v p-p = 1v -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 frequency (mhz) psrr (db) psrr- psrr+ a v = 10 c g = 0.8pf r l = 1k r g = 100 rf = 909 v p-p = 1v .01 0.1 1.0 10 100 1k -140 -120 -100 -80 -60 -40 -20 0 frequency (mhz) off isolation (db) c g = 1.6pf c l = 1.2pf a v = 10 r f = 909 r i = 100 v in = 640mv p-p r l = 1k .01 0.1 1.0 10 100 1k -120 -100 -80 -60 -40 -20 0 frequency (mhz) crosstalk (db) .01 0.1 1.0 10 100 1k c g = 1.6pf c l = 1.2pf a v = 10 r f = 909 r i = 100 v out (driven channel) = 640mv p-p r l = 1k 1 10 100 0.1 1 10 100 1k 10k 100k frequency (hz) input noise voltage (nv/ hz) a v = 100 r f = 303 r g = 3.3 r i = 1k 1 10 100 1000 frequency (hz) input noise current (pa/ hz) a v = 100 r f = 303 r g = 3.3 r l = 1k 0.1 1 10 100 1k 10k 100k isl55191, isl55291
8 fn6263.1 march 30, 2007 figure 19. large signal step respons e figure 20. small signal step response figure 21. percent overshoot for various c load figure 22. isl55291 positive input recovery time figure 23. isl55291 negative input recovery recovery figure 24. output overload recovery typical performance curves (continued) -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0 20406080100 time (ns) large signal (v) a v = 10 r l = 1k r g = 100 r f = 909 v s = + 2.5v -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0 20406080100 time (ns) small signal (v) a v = 10 r l = 1k r g = 100 r f = 909 v s = + 2.5v 0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50 cl (pf) overshoot (%) v out = 0.5v v out = 1v v out = 3.5v v out = 0.1v a v = 10 r l = 1k r g = 100 r f = 909 v s = + 2.5v output (v) input (v) time (ns) 0 20 40 60 80 100 120 140 160 180 200 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 output a v = 10 r l = 10k r g = 100 r f = 909 v s = 2.5v v in = vcm +0.5v input output (v) input (v) -3.1 -3.0 -2.9 -2.8 -2.7 -2.6 -2.5 -2.4 -2.3 -2.2 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 input output a v = 10 r l = 10k r g = 100 r f = 909 v s = 2.5v v in = -v-0.5v time ( ns ) 0 20 40 60 80 100 120 140 160 180 200 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 time (ns) -3 -2 -1 0 1 2 3 0 20 40 60 80 100 120 140 160 180 200 output input a v = 10 r l = 10k r g = 100 r f = 909 v s = + 2.5v v in = 0.7v p-p output (v) input (v) isl55191, isl55291
9 fn6263.1 march 30, 2007 figure 25. enable to output delay figure 26. isl55291 positive slew rate vs v s figure 27. isl55291 negative slew rate vs v s figure 28. supply current enabled vs temperature v s = 2.5v figure 29. supply current disabled vs temperature v s = 2.5v typical performance curves (continued) output enable -0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 0 0.5 1 1.5 2 2.5 3 3.5 4 time (s) enable/output (v) output enable a v = 10 r f = 909 r g = 100 r l = 10k v in = 280mv -1.0 0 1.0 2.0 3.0 4.0 5.0 6.0 enable (v) 220 230 240 250 260 270 280 3.0 3.5 4.0 4.5 5.0 5.5 v s (v) slew rate (v/s) a v = 10 r f = 909 r l = 10k r i = 100 -320 -310 -300 -290 -280 -270 -260 3.0 3.5 4.0 4.5 5.0 5.5 v s (v) slew rate (v/s) 9 10 11 12 13 14 15 16 17 18 19 -40-200 20406080 temperature ( c) current (ma) n = 2000 median min max 14 18 22 26 30 34 -40 -20 0 20 40 60 80 temperature ( c) current (a) n = 2000 median min max isl55191, isl55291
10 fn6263.1 march 30, 2007 figure 30. supply current enabled vs temperature v s = 1.5v figure 31. supply current disabled vs temperature v s = 1.5v figure 32. vio vs temperature v s = 2.5v figure 33. vio vs temperature v s = 1.5v figure 34. i bias+ vs temperature v s = 2.5v figure 35. i bias- vs temperature v s = 2.5v typical performance curves (continued) 8 9 10 11 12 13 14 15 16 -40-200 20406080 temperature ( c) current (ma) n = 2000 median min max 4 6 8 10 12 14 16 18 20 -40-200 20406080 temperature ( c) current (a) n = 2000 median min max -400 -200 0 200 400 600 800 -40 -20 0 20 40 60 80 temperature ( c) vos (v) n = 2000 median min max -700 -500 -300 -100 100 300 500 -40-200 20406080 temperature ( c) vos (v) n = 2000 median min max -15 -14.5 -14 -13.5 -13 -12.5 -12 -11.5 -11 -10.5 -10 -40-20 0 20406080 temperature ( c) ibias + (a) n = 2000 median min max -15 -14.5 -14 -13.5 -13 -12.5 -12 -11.5 -11 -10.5 -10 -40-20 0 20406080 temperature ( c) ibias - (a) n = 2000 median min max isl55191, isl55291
11 fn6263.1 march 30, 2007 figure 36. i bias+ vs temperature v s = 1.5v figure 37. i bias- vs temperature v s = 1.5v figure 38. cmrr vs temperature v+ = 2.5v, 1.5v figure 39. psrr vs temperature 1.5v to 2.5v figure 40. v out high vs temperature v s = 2.5v, r l =1k figure 41. v out low vs temperature v s = 2.5v, r l =1k typical performance curves (continued) -15.0 -14.5 -14.0 -13.5 -13.0 -12.5 -12.0 -11.5 -11.0 -10.5 -10.0 -40-200 20406080 temperature ( c) ibias + (a) n = 2000 median min max -15 -14 -13 -12 -11 -10 -9 -40-200 20406080 temperature ( c) ibias - (a) n = 2000 median max min 91 93 95 97 99 101 103 105 -40-200 20406080 temperature (c) cmrr (db) n = 2000 v+ = 5v v+ = 3v 73 74 75 76 77 78 79 80 81 -40 -20 0 20 40 60 80 temperature ( c) psrr (db) n = 2000 median min max 4.972 4.974 4.976 4.978 4.98 4.982 4.984 4.986 -40-20 0 20406080 temperature (c) v out (v) n = 2000 median min max 18 20 22 24 26 28 30 32 34 36 38 -40-200 20406080 temperature (c) v out (mv) n = 2000 median min max isl55191, isl55291
12 fn6263.1 march 30, 2007 figure 42. v out high vs temperature v s = 1.5v, r l = 1k figure 43. v out low vs temperature v s = 1.5v, r l = 1k typical performance curves (continued) 2.976 2.978 2.980 2.982 2.984 2.986 2.988 2.990 -40-200 20406080 temperature ( c) v out (v) n = 2000 median max min median max 23 26 29 32 35 38 41 -40-200 20406080 temperature (c) v out (v) min n = 2000 isl55191, isl55291
13 fn6263.1 march 30, 2007 pin descriptions isl55191 (8 ld soic) isl55191 (8 ld dfn) isl55291 (10 ld msop) pin name function equivalent circuit 5 6 nc not connected 232 (a) 8 (b) in- inverting input circuit 1 343 (a) 7 (b) in+ non-inverting input (see circuit 1) 4 5 4 v- negative supply 671 (a) 9 (b) out output circuit 2 7 8 10 v+ positive supply 5 (a) 6 (b) en enable pin with internal pull- down referenced to the -v pin; logic ?1? selects the disabled state; logic ?0? selects the enabled state. circuit 3a 8 1 en enable pin with internal pull- down referenced to the -v pin; logic ?0? (-v) selects the disabled state; logic ?1? (+v) selects the enabled state. circuit 3b 1 2 feedback feedback pin to reduce in- capacitance circuit 4 in+ in- v+ v- v+ v- out en v+ v- en v+ v- feedback v+ v- out isl55191, isl55291
14 fn6263.1 march 30, 2007 applications information product description the isl55191 and isl55291 are voltage feedback operational amplifiers designed for communication and imaging applications requiring very low voltage and current noise. both parts features low distortion while drawing moderately low supply current. the isl55191 and isl55291 use a classical voltage-feedback topology which allows them to be used in a variety of applications where current- feedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier. enable/power-down both devices can be operated from a single supply with a voltage range of +3v to +5v, or from split 1.5v to 2.5v. the logic level input to the enable pins are ttl compatible and are referenced to the -v terminal in both single and split supply applications. the following discussion assumes single supply operation. the isl55191 uses a logic ?0? (<0.8v) to disable the amplifier and the isl55291 uses a logic ?1? (>2v) to disable its amplifiers. in this condition, the output(s) will be in a high impedance state and the amplifier(s) current will be reduced to 21a. the isl55191 has an internal pull-up on the en pin and is enabled by either floating or tying the en pin to a voltage >2v. the isl55291 has internal pull-downs on the en pins and are enabled by either floating or tying the en pins to a voltage <0.8v. the enable pins should be tied directly to their respective supply pins when not being used (en tied to -v for the isl55291 and en tied to +v for the isl55191). current limiting the isl55191 and isl55291 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 +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 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 power supply bypassing and printed circuit board layout as with any high frequency device, good printed circuit board layout is necessary for optimum performance. low impedance ground plane construction is essential. surface mount components are recommended, but if leaded components are used, lead lengths should be as short as possible. the power supply pins must be well bypassed to reduce the risk of oscillation. the combination of a 4.7f tantalum capacitor in parallel with a 0.01f capacitor has been shown to work well when placed at each supply pin. for good ac performance, parasitic capacitance should be kept to a minimum, especially at the inverting input. when ground plane construction is used, it should be removed from the area near the inverting input to minimize any stray capacitance at that node. carb on or metal-film resistors are acceptable with the metal-film resistors giving slightly less peaking and bandwidth because of additional series inductance. use of sockets (particularly for the soic package) should be avoided if possible. sockets add parasitic inductance and capacitance which will result in additional peaking and overshoot. for inverting gains, this parasiti c capacitance has little effect because the inverting input is a virtual ground, but for non- inverting gains, this capacitance (in conjunction with the feedback and gain resistors) creates a pole in the feedback path of the amplifier. this pole, if low enough in frequency, has the same destabilizing effect as a zero in the forward open-loop response. the use of large-value feedback and gain resistors exacerbates the problem by further lowering the pole frequency (increasing t he possibility of oscillation.). 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) isl55191, isl55291
15 fn6263.1 march 30, 2007 current sense application circuit the schematic in figure 44 pr ovides an example of utilizing the isl55191 high speed per formance with the ground sensing input capability to implement a single-supply, g = 10 differential low side current sense amplifier. the reference voltage applied to v ref (+2.5v) defines the amplifier output 0a current sense reference voltage at one half the supply voltage level (v s = +5vdc), and r sense sets the current sense gain and full scale values. in this example the current gain is 10a/v over a maximum current range of slightly less than 25a with r sense = 0.01 . the amplifier v io error (800v max) and input bias offset current i io error (0.7a) together contribute less than 10m v (100ma) at the output for better than 0.2% full scale accuracy. the amplifier?s high slew rate and fast pulse response make this circuit suitable for low-side current sensing in pmwm and motor control applications. the excellent input overload recovery response enables the circuit to maintain performance in the presence of parasitic inductance that cause fast rise and falling edge spikes that can momentarily overload the input stage of the amplifier. r sense 0.01 r f 10k in- in+ isl55191 r l r t out v- v+ feedback +5vdc parasitic l to r vout current input current input r g+ 100 r g- 100 r ref 10k figure 44. ground side current sense amplifier v ref +2.5v isl55191, isl55291
16 fn6263.1 march 30, 2007 isl55191, isl55291 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
17 fn6263.1 march 30, 2007 isl55191, isl55291 package outline drawing l8.3x3d 8 lead dual flat no-lead plastic package (dfn) rev 0, 9/06 c bottom view top view side view detail ?x? typical recommended land pattern 3.00 pin 1 index area (1.75) (1.45) (8x 0.25) (8x 0.60) (6x 0.50 bsc) see detail x'' 0.20 ref 0~0.05 5 pin 1 index area 8x 0.25 6x 0.50 bsc 1.75 1.50 ref 3.00 0.85 (2.20) 8x 0.40 2.20 4x a b 0.10 c a b 0.10 c seating plane 0.08 c c 1.45 notes: 1. controlling dimensions are in mm. dimensions in ( ) for reference only. 2. unless otherwise specified, tolerance : decimal 0.05 angular 2 3. dimensioning and tolerancing conform to jedec std mo220-d. 4. the configuration of the pin #1 identifier is optional, but must be located within the zone indicated. the pin #1 identifier may be either a mold or mark feature. 5. tiebar shown (if present) is a non-functional feature. 0.075 c m
18 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 fn6263.1 march 30, 2007 isl55191, isl55291 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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