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1 lt1 101 1101fa gain error: 0.04% max gain nonlinearity: 0.0008% (8ppm) max gain drift: 4ppm/ c max supply current: 105 a max offset voltage: 160 v max offset voltage drift: 0.4 v/ c typ offset current: 600pa max cmrr, g = 100: 100db min 0.1hz to 10hz noise: 0.9 vp-p typ 2.3pap-p typ gain bandwidth product: 250khz min single or dual supply operation surface mount package available the lt 1101 establishes the following milestones: (1) it is the first micropower instrumentation amplifier,(2) it is the first single supply instrumentation amplifier, (3) it is the first instrumentation amplifier to feature fixed gains of 10 and/or 100 in low cost, space-saving 8-lead packages. the lt1101 is completely self-contained: no external gain setting resistor is required. the lt1101 combines its micropower operation (75 a supply current) with a gain error of 0.008%, gain linearity of 3ppm, gain drift of1ppm/ c. the output is guaranteed to drive a 2k load to 10v with excellent gain accuracy. other precision specifications are also outstanding:50 v input offset voltage, 130pa input offset current, and low drift (0.4 v/ c and 0.7pa/ c). in addition, unlike other instrumentation amplifiers, there is no output offsetvoltage contribution to total error. a full set of specifications are provided with 15v dual supplies and for single 5v supply operation. the lt1101can be operated from a single lithium cell or two ni-cad batteries. battery voltage can drop as low as 1.8v, yet the lt1101 still maintains its gain accuracy. in single supply applications, both input and output voltages swing to within a few millivolts of ground. the output sinks current while swinging to ground?o external, power consuming pull down resistors are needed. precision, micropower, single supply instrumentation amplifier (fixed gain = 10 or 100) features applicatio s u descriptio u differential signal amplification in presence ofcommon mode voltage micropower bridge transducer amplifier?thermocouples ?strain gauges ?thermistors differential voltage-to-current converter transformer coupled amplifier 4ma to 20ma bridge transmitter , ltc and lt are registered trademarks of linear technology corporation. gain error distribution gain error (%) ?.04 0 percent of units 5 10 15 20 ?.02 0 0.02 0.04 25 30 ?.03 ?.01 0.01 0.03 lt1101 ?ta02 930 unitstested in all packages g = 100r l = 50k t a = 25 c typical applicatio u + + lt1101 ?ta01 output 90r9r 90r 9r r ab r 9.2k r v + v inverting input ground pin 1, output at pin 8 g = 100: no additional connections g = 10: short pin 2 to pin 1, short pin 7 to pin 8 short to 1, g = 10 n.c. g = 100 ground (ref) 87 6 5 4 3 2 1 short to 8 g = 10 n.c. g = 100 noninverting input downloaded from: http:///
2 lt1 101 1101fa absolute axi u rati gs w ww u supply voltage ...................................................... 22v differential input voltage ....................................... 36v input voltage ............... equal to positive supply voltage ..........10v below negative supply voltage output short circuit duration .......................... indefinite (note 1) operating temperature range lt1101am/lt1101m (obsolete) ... 55 c to 125 c lt1101ai/lt1101i .............................. 40 c to 85 c lt1101ac/lt1101c ................................ 0 c to 70 c storage temperature range ................. 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c package/order i for atio uu w consult ltc marketing for parts specified with wider operating temperature ranges. lt1101ain8lt1101in8 lt1101acn8 lt1101cn8 lt1101swlt1101isw obsolete packages consider the n8 as an alternate source lt1101amhlt1101mh lt1101ach lt1101ch order part number order part number order part number outg = 10 ref g = 10 12 3 4 5 6 7 8 top view 1615 14 13 12 11 10 9 nc gnd (ref) nc ?n nc v nc ncnc nc v + nc output +in + + r 9.2k 90r9r 90r 9r rr sw package 16-lead plastic so t jmax = 150 c, ja = 100 c/w + + 1 2 3 4 5 6 7 8 top view v ?n outputout g = 10 ref g = 10 ground (ref) +in r 9.2k 90r9r 90r 9r rr v + t jmax = 150 c, ja = 130 c/w top view outg = 10 output ref g = 10 +in 90r 90r r r 9r 9r v + ?n v (case) ground (ref) 8 7 6 5 3 2 1 4 h package 8-lead to-5 metal can + + t jmax = 150 c, ja = 150 c/w, jc = 45 c/w lt1101amj8lt1101mj8 lt1101acj8 lt1101cj8 t jmax = 150 c, ja = 100 c/w n package 8-lead pdip j package 8-lead cerdip electrical characteristics lt11o1am/ai/ac lt1101m/i/c symbol parameter conditions min typ max min typ max units g e gain error g = 100, v 0 = 0.1v to 3.5v, r l = 50k 0.010 0.050 0.011 0.075 % g = 10, v 0 = 0.1v to 3.5v, r l = 50k 0009 0.040 0.010 0.060 % g nl gain nonlinearity g = 100, r l = 50k 20 60 20 75 ppm g = 10, r l = 50k (note 2) 3 7 3 8 ppm v os input offset voltage 50 160 60 220 v lt1101sw 250 600 v l os input offset current 0.13 0.60 0.15 0.90 na i b input bias current 6 8 6 10 na i s supply current 75 105 78 120 a v s = 5v, 0v, v cm = 0.1v, v ref(pin 1) = 0.1v, g = 10 or 100, t a = 25 c, unless otherwise noted. (note 4) downloaded from: http:///
3 lt1 101 1101fa lt1101am/ai/ac lt1101m/i/c symbol parameter conditions min typ max min typ max units g e gain error g = 100, v o = 10v, r l = 50k 0.008 0.040 0.009 0.060 % g = 100, v o = 10v, r l = 2k 0.011 0.055 0.012 0.070 % g = 100, v o = 10v, r l = 50k or 2k 0.008 0.040 0.009 0.060 % g nl gain nonlinearity g = 100, r l = 50k 7 16 8 20 ppm g = 100, r l = 2k 24 45 25 60 ppm g = 10, r l = 50k or 2k 3 8 3 9 ppm v os input offset voltage 50 160 60 220 v lt1101sw 250 600 v l os input offset current 0.13 0.60 0.15 0.90 na i b input bias current 6 8 6 10 na input resistance common mode (note 2) 4 7 3 7 g ? differential mode (note 2) 7 12 5 12 g ? e n input noise voltage 0.1hz to 10hz (note 3) 0.9 1.8 0.9 vp-p input noise voltage f o = 10hz (note 3) 45 64 45 nv/ hz density f o = 1000hz (note 3) 43 54 43 nv/ hz i n input noise current 0.1hz to 10hz (note 3) 2.3 4.0 2.3 pap-p input noise current f o =10hz (note 3) 0.06 0.10 0.06 pa/ hz density f o = 1000hz 0.02 0.02 pa/ hz lnput voltage range g = 100 13.0 13.8 13.0 13.8 v 14.4 14.7 14.4 14.7 v g = 10 11.5 12.5 11.5 12.5 v 13.0 13.3 13.0 13.3 v cmrr common mode 1k source imbalance rejection ratio g = 100, over cm range 100 112 98 112 db g = 10, over cm range 84 100 82 99 db psrr power supply v s = + 2.2v, 0.1v to 18v 102 114 100 114 db rejection ratio i s supply current 92 130 94 150 a electrical characteristics lt11o1am/ai/ac lt1101m/i/c symbol parameter conditions min typ max min typ max units cmrr common mode 1k source imbalance rejection ratio g = 100, v cm = 0.07v to 3.4v 95 106 92 105 db g = 10, v cm = 0.07v to 3.1v 84 100 82 99 db minimum supply voltage (note 5) 1.8 2.3 1.8 2.3 v v o maximum 0utput output high, 50k to gnd 4.1 4.3 4.1 4.3 v voltage swing output high, 2k to gnd 3.5 3.9 3.5 3.9 v output low, v ref = 0, no load 3.3 6 3.3 6 mv output low, v ref = 0, 2k to gnd 0.5 1 0.5 1 mv output low, v ref = 0, l sink = 100 a9 0 130 90 130 mv bw bandwidth g = 100 (note 2) 2.0 3.0 2.0 3.0 khz g = 10 (note 2) 22 33 22 33 khz sr slew rate (note 2) 0.04 0.07 0.04 0.07 v/ s v s = 5v, 0v, v cm = 0.1v, v ref(pin 1) = 0.1v, g = 10 or 100, t a = 25 c, unless otherwise noted. (note 4)v s = 15v, v cm = 0v, t a = 25 c, gain = 10 or 100, unless otherwise noted. downloaded from: http:///
4 lt1 101 1101fa electrical characteristics lt1101am/ai lt1101m/i symbol parameter conditions min typ max min typ max units v o maximum 0utput r l = 50k 13.0 14.2 13.0 14.2 v voltage swing r l = 2k 11.0 13.2 11.0 13.2 v bw bandwidth g = 100 (note 2) 2.3 3.5 2.3 3.5 khz g = 10 (note 2) 25 37 25 37 khz sr slew rate 0.06 0.10 0.06 0.10 v/ s v s = 15v, v cm = 0v, t a = 25 c, gain = 10 or 100, unless otherwise noted. lt1101am/ai lt1101m/i symbol parameter conditions min typ max min typ max units g e gain error g = 100, v o = 10v, r l = 50k 0.024 0.070 0.026 0.100 % g = 100, v o = 10v, r l = 5k 0.030 0.100 0.035 0.130 % g = 10, v o = 10v, r l = 50k or 5k 0.015 0.070 0.018 0.100 % tcg e gain error drift g = 100, r l = 50k 2 4 2 5 ppm/ c (note 2) g = 100, r l = 5k 2 7 2 8 ppm/ c g = 10, r l = 50k or 5k 1 4 1 5 ppm/ c g nl gain nonlinearity g = 100, r l = 50k 24 70 26 90 ppm g = 100, r l = 5k 70 300 75 500 ppm g = 10, r l = 50k 4 13 5 15 ppm g = 10, r l = 5k 10 40 12 60 ppm v os input offset voltage 90 350 110 500 v lt1101isw 110 950 v ? v os / ? t input offset voltage drift (note 2) 0.4 2.0 0.5 2.8 v/ c lt1101isw 0.5 4.8 mv/ c l os input offset current 0.16 0.80 0.19 1.30 na ? l os / ? t input offset current drift (note 2) 0.5 4.0 0.8 7.0 pa/ c i b input bias current 7 10 7 12 na ? i b / ? t input bias current drift (note 2) 10 25 10 30 pa/ c cmrr common mode g = 100, v cm = 14.4v to 13v 96 111 94 111 db rejection ratio g = 100, v cm = 13v to 11.5v 80 99 78 98 db psrr power supply v s = 3.0, 0.1v to 18v 98 110 94 110 db rejection ratio i s supply current 105 165 108 190 a v o maximum 0utput r l = 50k 12.5 14.0 12.5 14.0 v voltage swing r l = 5k 11.0 13.5 11.0 13.5 v electrical characteristics v s = 15v, v cm = 0v, gain = 10 or 100, 55 c t a 125 c for am/m grades, 40 c t a 85 c for ai/i grades, unless otherwise noted. downloaded from: http:///
5 lt1 101 1101fa electrical characteristics v s = 15v, v cm = 0v, gain = 10 or 100, 0 c t a 70 c, unless otherwise noted. lt1101ac lt1101c/s symbol parameter conditions min typ max min typ max units g e gain error g = 100, v o = 10v, r l = 50k 0.012 0.055 0.014 0.080 % g = 100, v o = 10v, r l = 2k 0.018 0.085 0.020 0.100 % g = 10, v o = 10v, r l = 50k or 2k 0.009 0.055 0.010 0.080 % tcg e gain error drift g = 100, r l = 50k 1 4 1 5 ppm/ c (note 2) g = 100, r l = 2k 2 7 2 9 ppm/ c g = 10, r l = 50k or 5k 1 4 1 5 ppm/ c g nl gain nonlinearity g = 100, r l = 50k 9 25 10 35 ppm g = 100, r l = 2k 33 75 36 100 ppm g = 10, r l = 50k or 2k 4 10 4 11 ppm v os input offset voltage 70 250 85 350 v lt1101sw 300 800 v ? v os / ? t input offset voltage drift (note 2) 0.4 2.0 0.5 2.8 v/ c lt1101sw 1.2 4.5 v/ c l os input offset current 0.14 0.70 0.17 1.10 na ? i os / ? t input offset current drift (note 2) 0.5 4.0 0.8 7.0 pa/ c i b input bias current 6 9 6 11 na ? i b / ? t input bias current drift (note 2) 10 25 10 30 pa/ c cmrr common mode g = 100, v cm = 14.4v to 13v 98 112 96 112 db rejection ratio g = 100, v cm = 13v to 11.5v 82 100 80 99 db psrr power supply v s = 2.5, 0.1v to 18v 100 112 97 112 db rejection ratio i s supply current 98 148 100 170 a v o maximum 0utput r l = 50k 12.5 14.1 12.5 14.1 v voltage swing r l = 2k 10.5 13.0 10.5 13.0 v downloaded from: http:///
6 lt1 101 1101fa lt1101am/ai lt1101m/i symbol parameter conditions min typ max min typ max units g e gain error g = 100, v 0 = 0.1v to 3.5v, r l = 50k 0.026 0.080 0.028 0.120 % g = 10, v cm = 0.15, r l = 50k 0.011 0.070 0.014 0.100 % tcg e gain error drift r l = 50k (note 2) 1 4 1 5 ppm/ c g nl gain nonlinearity g = 100, r l = 50k 45 110 48 140 ppm g = 10, r l = 50k (note 2) 4 13 5 15 ppm v os input offset voltage 90 350 110 500 v lt1101isw 110 950 v ? v os / ? t input offset voltage drift (note 2) 0.4 2.0 0.5 2.8 v/ c lt1101isw 0.5 4.8 v/ c l os input offset current 0.16 0.80 0.19 1.30 na ? v os / ? t input offset current drift (note 2) 0.5 4.0 0.8 7.0 pa/ c i b input bias current 7 10 7 12 na ? i b / ? t input bias current drift (note 2) 10 25 10 30 pa/ c cmrr common mode g = 100, v cm = 0.1v to 3.2v 91 105 88 104 db rejection ratio g = 10, v cm = 0.1v to 2.9v, v ref = 0.15v 80 98 77 97 db i s supply current 88 135 92 160 a v 0 maximum 0utput output high, 50k to gnd 3.8 4.1 3.8 4.1 v voltage swing output high, 2k to gnd 3.0 3.7 3.0 3.7 v output low, v ref = 0, no load 4.5 8 4.5 8 mv output low, v ref = 0, 2k to gnd 0.7 1.5 0.7 1.5 mv output low, v ref = 0, i sink = 100 a 125 170 125 170 mv v s = 5v, 0v, v cm = 0.1v, v ref(pin 1) = 0.1v, gain = 10 or 100, ?0 c t a 85 c for ai/i grades, unless otherwise noted (note 4). electrical characteristics downloaded from: http:///
7 lt1 101 1101fa lt1101ac lt1101c/s symbol parameter conditions min typ max min typ max units g e gain error g = 100, v o = 0.1v to 3.5v, r l = 50k 0.017 0.065 0.018 0.095 % g = 10, v cm = 0.15v, r l = 50k 0.010 0.060 0.012 0.080 % tcg e gain error drift r l = 50k (note 2) 1 4 1 5 ppm/ c g nl gain nonlinearity g = 100, r l = 50k 25 80 25 100 ppm g = 10, r l = 50k (note 2) 4 10 4 11 ppm v os input offset voltage 70 250 85 350 v lt1101sw 300 800 v ? v os / ? t input offset voltage drift (note 2) 0.4 2.0 0.5 2.8 v/ c lt1101sw 1.2 4.5 v/ c l os input offset current 0.14 0.70 0.17 1.10 na ? i os / ? t input offset current drift (note 2) 0.5 4.0 0.8 7 pa/ c i b input bias current 6 9 6 11 na ? i b / ? t input bias current drift (note 2) 10 25 10 30 pa/ c cmrr common mode g = 100, v cm = 0.07v to 3.3v 93 105 90 104 db rejection ratio g = 10, v cm = 0.07v to 3v, v ref = 0.15v 82 99 80 98 db i s supply current 80 120 85 145 a v o maximum 0utput output high, 50k to gnd 4.0 4.2 4.0 4.2 v voltage swing output high, 2k to gnd 3.3 3.8 3.3 3.8 v output low, v ref = 0, no load 4 7 4 7 mv output low, v ref = 0, 2k to gnd 0.6 1.2 0.6 1.2 mv output low, v ref = 0, i sink = 100 a 100 150 100 150 mv v s = 5v, 0v, v cm = 0.1v, v ref(pin 1) = 0.1v, gain = 10 or 100, 0 c t a 70 c, unless otherwise noted (note 4). electrical characteristics note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired.note 2: this parameter is not tested. it is guaranteed by design and by inference from other tests.note 3: this parameter is tested on a sample basis only. note 4: these test conditions are equivalent to v s = 4.9v, 0.1v, v cm = 0v, v ref(pin1) = 0v. note 5: minimum supply voltage is guaranteed by the power supply rejection test. the lt1101 actually works at 1.8v supply with minimaldegradation in performance. downloaded from: http:///
8 lt1 101 1101fa typical perfor a ce characteristics uw gain = 100 nonlinearitydistribution gain nonlinearity (ppm) 0 0 percent of units 5 15 20 25 4 8 10 18 10 26 12 14 16 30 lt1101 ?tpc01 v s = 15v t a = 25 c r l 50k ? 708 unitstested in all packages gain = 10 nonlinearitydistribution gain nonlinearity (ppm) 0 percent of units 30 40 50 8 20 10 0 2 4 6 10 lt1101 ?tpc02 v s = 15v t a = 25 c r l 2k ? 708 unitstested in all packages lt1101 ?tpc03 frequency (hz) ?.5 gain error (%) gain (db) 0 ?.0 0 10 1k 10k 1m 4030 20 10 ?.0 100 100k ?.5?.5 ?.5 v s = 15v t a = 25 c g = 100 g = 10 gain vs frequency gain error over temperature input offset voltage ( v) ?00 0 0 percent of units 10 20 100 ?00 200 30 lt1101 ?tpc06 t a = 25 c 746 units measured in all packages each unit measured at v s = 15v, 0v and at v s = 15v input offset voltage distribution gain nonlinearity temperature input bias and offset currents vstemperature temperature ( c) ?0 ? offset current (pa) bias current (na) ? 200 0 50 75 ? 150100 ?5 25 100 125 lt1101 ?tpc08 v s = 5v, 0v to 15v i os i b supply current vs temperature temperature ( c) ?0 supply current ( a) 90 100 110 25 75 80 70 ?5 0 50 100 125 60 50 lt1101 ?tpc07 v s = 5v, 0v v s = 15v common mode voltage (v) ? ?2 input bias current (na) ?0 ? ? ? ? 0 0123 4 lt1101 ?tpc09 t a = ?5 c t a = 125 c v s = 5v, 0v t a = 25 c input bias current vscommon mode voltage voltage 1 6 5 temperature ( c) ?0 25 0 gain error (%) 0.02 0.05 0 50 75 0.01 0.04 0.03 25 100 125 lt1101 ?tpc04 2 13 6 57 4 4 7 g = 100, v s = 15v, r l = 2k g = 10, v s = 15v, r l = 2k g = 100, v s = 15v, r l = 5k g = 100, v s = 5v, 0v, r l = 50k g = 100, v s = 15v, r l = 50k g = 10, v s = 15v, r l = 5k g = 10, v s = 15v or 5v, 0v, r l = 50k 3 2 see gain vs tfor definitions temperature ( c) ?0 gain nonlinearity (ppm) 40 50 60 25 75 30 20 ?5 0 50 100 125 10 0 lt1101 ?tpc05 2 1 6 5 4 7 3 downloaded from: http:///
9 lt1 101 1101fa typical perfor a ce characteristics uw common mode range vs supplyvoltage power supply rejection ratio vsfrequency lt1101 ?tpc12 frequency (hz) 40 power supply rejection ratio (db) 80 120 20 60 100 10 1k 10k 100k 0 100 t a = 25 c negative supply positive supply common mode rejection ratio vsfrequency short-circuit current vs time output voltage swing vs loadcurrent lt1101 ?tpc14 sourcing or sinking load current (ma) 0.01 output voltage swing (v) 0.1 1 10 v v ?1 v + ? v + ? v ? 2 v + 125 c ?5 c ?5 c 125 c 25 c 25 c output saturation vs temperaturevs sink current lt1101 ?tpc13 temperature ( c) ?0 ?5 saturation voltage (mv) 10 100 1000 0255075 100 125 1 i sink = 2ma i sink = 1ma i sink = 100 a i sink = 10 a i sink = 1 a no load v s = 5v, 0v r l = 5k to ground undistorted output swing vsfrequency output impedance vs frequency frequency (hz) output impedance ( ? ) 10 100 1k 1 0.1 10 100 10k 100k 1k lt1101 ?tpc18 g = 100 g = 10 lt1101 ?tpc16 capacitive load (nf) 0.1 0 overshoot (%) 80 100 120 11 0 100 6040 20 v s = 2.0v to 15v t a = 25 c g = 100 g = 10 capacitive load handling frequency (hz) 0.1 0 common mode rejection ratio (db) 20 40 60 80 120 1 10 100 1k 10k 100k 100 lt1101 ?tpc10 v s = 15v t a = 25 c g = 10 g = 100c = 82pf pin 1 to pin 2 g = 100 supply voltage (v) 0 v common mode range (v) v ? 1 v + ? v + ? v + ? 4 8 10 18 v ? 2 2 6 12 14 16 v + lt1101 ?tpc11 g = 100 g = 10 25 c 125 c ?5 c 125 c ?5 c 25 c g = 100 g = 10 alltemperatures time from output short to ground (minutes) 0 sinking sourcing short-circuit current (ma) ?0 0 10 ?0 ?0 ?0 12 20 30 40 3 lt1101 ?tpc15 t a = 125 c, v s = 5v, 0v t a = 25 c, v s = 15v t a = 5 c, v s = 15v t a = 125 c, v s = 15v t a = 125 c, v s = 15v t a = 25 c, v s = 5v, 0v lt1101 ?tpc17 frequency (hz) 100 peak-to-peak output swing, v s = 15v (v) peak-to-peak output swing, v s = 5v, 0v (v) 1k 10k 100 0 2010 30 54 3 2 1 0 v s = 5v, 0v, r l 1k v s = 5v, 0v, r l 100k v s = 15v r l 30k v s = 15v r l 100k t a = 25 c load, r l , to ground downloaded from: http:///
10 lt1 101 1101fa typical perfor a ce characteristics uw warm-up drift noise spectrum large signal transient responseg = 10, v s = 5v, 0v frequency (hz) 0.1 10 voltage noise density (nv/ hz) voltage noise density (fa/ hz) 100 1000 300 30 10 1000 100 1 lt1101 ?tpc19 currentnoise voltage noise v s = 2.5v to 15v t a = 25 c 1/f corner0.6hz time after power on (minutes) 0 change in offset voltage ( v) 0.40.2 12 0 0.8 0.6 3 lt1101 ?tpc20 v s = 15v t a = 25 c warm up drift at v s = 5v, 0v is immeasurably low 1v/div 50 s/div output from 0v to 4.5v, no load large signal transient responseg = 10, v s = 15v 5v/div 200 s/div no load large signal transient responseg = 100, v s = 15v 5v/div 200 s/div no load large signal transient responseg = 100, v s = 5v, 0v 1v/div 100 s/div output from 0v to 4.5v, no load small signal transient responseg = 10, v s = 5v, 0v 20mv/div 20 s/div output from 0.05v to 0.15v, no load small signal transient responseg = 10, v s = 15v 20mv/div 20 s/div small signal transient responseg = 100, v s = 5v, 0v 20v/div 200 s/div output from 0.05v to 0.15v, no load (response with v s = 15v, g = 100 is identical) lt1101 ?tpc20.1 lt1101 ?tpc20.4 lt1101 ?tpc20.2 lt1101 ?tpc20.3 lt1101 ?tpc20.5 lt1101 ?tpc20.6 lt1101 ?tpc20.7 downloaded from: http:///
11 lt1 101 1101fa single supply: minimum outputvoltage vs common mode voltage single supply: minimumcommon mode voltage vs output voltage minimum supply voltage vstemperature typical perfor a ce characteristics uw applicatio s i for atio wu uu single supply applicationsthe lt1101 is the first instrumentation amplifier which is fully specified for single supply operation, (i.e. when the negative supply is 0v). both the input common mode range and the output swing are within a few millivolts of ground. probably the most common application for instrumenta- tion amplifiers is amplifying a differential signal from a transducer or sensor resistance bridge. all competitive instrumentation amplifiers have a minimum required common mode voltage which is 3v to 5v above the negative supply. this means that the voltage across the bridge has to be 6v to 10v or dual supplies have to be used (i.e., micropower) single battery usage is not attainable on competitive devices. the minimum output voltage obtainable on the lt1101 is a function of the input common mode voltage. when the common mode voltage is high and the output is low, current will flow from the output of amplifier a into the output of amplifier b. see the minimum output voltage vs common mode voltage plot. similarly, the single supply minimum common mode voltage vs output voltage plot specifies the expected common mode range. when the output is high and input common mode is low,the output of amplifier a has to sink current coming from the output of amplifier b. since amplifier a is effectively in unity gain, its input is limited by its output. common mode rejection vs frequency the common mode rejection ratio (cmrr) of the lt1101 starts to roll off at a relatively low frequency. however, as shown on the common mode rejection ratio vs fre- quency plot, cmrr can be enhanced significantly by connecting an 82pf capacitor between pins 1 and 2. this improvement is only available in the gain 100 configura- tion, and it is in excess of 30db at 60hz. offset nulling the lt1101 is not equipped with dedicated offset null terminals. in many bridge transducer or sensor applica- tions, calibrating the bridge simultaneously eliminates the instrumentation amplifier? offset as a source of error. for example, in the micropower remote temperature sensor application shown, one adjustment removes the offset errors due to the temperature sensor, voltage reference and the lt1101. output voltage (v) 0 0 minimum common mode voltage (v) 20 40 60 80 120 2 468 10 12 100 lt1101 ?tpc21 g = 10 g = 100 v + = 1.8v to 15v v = ov ?5 c ?5 c 125 c 125 c 25 c 25 c lt1101 ?tpc22 minimum output voltage (mv) 0 common mode voltage (v) 6 8 10 97 5 3 80 42 1 0 20 10 40 30 60 70 90 50 100 g = 10 g = 100 125 c 125 c 25 c ?5 c ?5 c v + = 1.8v to 15v v = ov no load 25 c temperature ( c) ?0 0 minimum supply, output swing, common mode range (v) 1.0 2.5 0 50 75 lt1101 ?tpc23 0.5 2.0 1.5 ?5 25 100 125 common-mode rangeat minimum supply minimumsupply voltage v = 0v output swingat minimum supply downloaded from: http:///
12 lt1 101 1101fa a simple resistive offset adjust procedure is shown below.if r = 5 ? for g = 10, and r = 50 ? for g = 100, then the effect of r on gain error is approximately 0.006%.unfortunately, about 450 a has to flow through r to bias the reference terminal (pin 1) and to null out the worst-case offset voltage. the total current through the resistor network can exceed 1ma, and the micropower advantage of the lt1101 is lost. applicatio s i for atio wu uu another offset adjust scheme uses the lt1077 micropowerop amp to drive the reference pin 1. gain error and common mode rejection are unaffected, the total current increase is 45 a. the offset of the lt1077 is trimmed and amplified to match and cancel the offset voltage of thelt1101. output offset null range is 25mv. lt1101 ?ai01 15v 10k10k 20k out lt1101 10k ?15v 36 5 8 1 r 4 + + lt1101 ?ai02 out lt1101 1.2v to 18v ?.2v to ?8v 100k 3.3k 5k pot 3 3 6 6 7 8 8 1 4 4 2 5 1 + lt1077 gains between 10 and 100 gains between 10 and 100 can be achieved by connecting two equal resistors (= r x ) between pins 1 and 2 and pins 7 and 8.the nominal value of r is 9.2k ? . the usefulness of this method is limited by the fact that r is not controlled tobetter than 10% absolute accuracy in production. however, on any specific unit, 90r can be measuredbetween pins 1 and 2. input protection instrumentation amplifiers are often used in harsh environments where overload conditions can occur. the lt1101 employs pnp input transistors, consequently the differential input voltage can be 30v (with 15v supplies, 36v with 18v supplies) without an increase in input bias current. competitive instrumentation amplifiershave npn inputs which are protected by back-to-back diodes. when the differential input voltage exceeds 1.3v on these competitive devices, input current increases tothe milliampere level; more than 10v differential voltage can cause permanent damage.when the lt1101? inputs are pulled above the positive supply, the inputs will clamp a diode voltage above the positive supply. no damage will occur if the input current is limited to 20ma. 500 ? resistors in series with the inputs protect the lt1101 when the inputs are pulled as much as 10v below thenegative supply. gain = 10 + r x r+r x /90 downloaded from: http:///
13 lt1 101 1101fa applicatio s i for atio wu uu lt1101 ?ai04 75k output i loop 5k 5 63 1 2 4 8 7 18k 390k 12v 62.5 ? lt1004-1.2 4ma to 20ma in ?ov to 10v out trim output to 5v at 12ma in + lt1101 lt1101 ?ai05 5 63 1 2 4 8 2k 7 v + = 15v v = 15v out gain = 10, degraded by 0.01% due to lt1010 output = 10v into 75 ? (to 1.5khz) drives any capacitive load single supply application (v + = 5v, v = ov): v out min = 120mv, v out max = 3.4v l t1101 + l t1010 + lt1101 ?ai06 5 63 1 r r 100v in ?.5v i out = i out r l v in 4 8 9v lt11 01 i out = 0ma to 5ma voltage compliance = 6.4v (r 200 ? ) micropower, battery operated remote temperature sensor 4ma to 20ma loop receiver instrumentation amplifier with 150ma output current voltage controlled current source lt1101 ?ai03 + l t1101 g = 10 remote temp sensor 75k 100na k 20k 62 ? 2210 ? 10k 75k 3v 2k pot 6 3 5 1 2 4 7 8 lm134-3 out 10mv/ c trim output to 250mv at 25 c temperature range = 2.5 c to 150 c accuracy = 0.5 c l t1004-1.2 downloaded from: http:///
14 lt1 101 1101fa applicatio s i for atio wu uu + lt1101 ?ai07 5 63 4 r shield minimum voltage across bridge = 20mv minimum supply voltage = 1.8v r rr resistance bridge transducer or sensor 1 8 v + out lt 1101 g = 100 differential voltage amplification from a resistance bridge gain = 20, 110 or 200 instrumentation amplifier differential output single ended output lt1101 ?ai08 8 63 8 1 63 out + in gain = 200, as shown gain = 20, short pin 1 to pin 2, pin 7 to pin 8 on both devices gain = 110, short pin 1 to pin 2, pin 7 to pin 8 on one device, not on the other input referred noise is reduced by 2 (g = 200 or 20) + lt1101 + lt1101 8 1 63 8 1 63 + lt1101 + in + out + lt1101 1 downloaded from: http:///
15 lt1 101 1101fa information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. u package descriptio h package 8-lead to-5 metal can (.200 inch pcd) (reference ltc dwg # 05-08-1320) .050 (1.270) max .016 ?.021** (0.406 ?0.533) .010 ?.045* (0.254 ?1.143) seating plane .040 (1.016) max .165 ?.185 (4.191 ?4.699) gaugeplane referenceplane .500 ?.750 (12.700 ?19.050) .305 ?.335 (7.747 ?8.509) .335 ?.370 (8.509 ?9.398) dia .200 (5.080) typ .027 ?.045 (0.686 ?1.143) .028 ?.034 (0.711 ?0.864) .110 ?.160 (2.794 ?4.064) insulating standoff 45 typ h8(to-5) 0.200 pcd 0801 lead diameter is uncontrolled between the reference plane and the seating plane for solder dip lead finish, lead diameter is .016 ?.024 (0.406 ?0.610) * ** pin 1 obsolete packages j8 0801 .014 ?.026 (0.360 ?0.660) .200 (5.080) max .015 ?.060 (0.381 ?1.524) .125 3.175 min .100 (2.54) bsc .300 bsc (7.62 bsc) .008 ?.018 (0.203 ?0.457) 0 ?15 .005 (0.127) min .405 (10.287) max .220 ?.310 (5.588 ?7.874) 12 3 4 87 65 .025 (0.635) rad typ .045 ?.068 (1.143 ?1.650) full lead option .023 ?.045 (0.584 ?1.143) half lead option corner leads option (4 plcs) .045 ?.065 (1.143 ?1.651) note: lead dimensions apply to solder dip/plate or tin plate leads j8 package 8-lead cerdip (narrow .300 inch, hermetic) (reference ltc dwg # 05-08-1110) downloaded from: http:///
16 lt1 101 1101fa u package descriptio linear technology corporation 1 630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com lw/tp 1002 1k rev a ? printed in usa ? l inear technology corporation 1989 sw package 16-lead plastic small outline (wide .300 inch) (reference ltc dwg # 05-08-1620) s16 (wide) 0502 note 3 .398 ?.413 (10.109 ?10.490) note 4 16 15 14 13 12 11 10 9 1 n 23 4 5 6 78 n/2 .394 ?.419 (10.007 ?10.643) .037 ?.045 (0.940 ?1.143) .004 ?.012 (0.102 ?0.305) .093 ?.104 (2.362 ?2.642) .050 (1.270) bsc .014 ?.019 (0.356 ?0.482) typ 0 ?8 typ note 3 .009 ?.013 (0.229 ?0.330) .005 (0.127) rad min .016 ?.050 (0.406 ?1.270) .291 ?.299 (7.391 ?7.595) note 4 45 .010 ?.029 (0.254 ?0.737) inches (millimeters) note:1. dimensions in 2. drawing not to scale 3. pin 1 ident, notch on top and cavities on the bottom of packages are the manufacturing options. the part may be supplied with or without any of the options 4. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) .420 min .325 .005 recommended solder pad layout .045 .005 n 123 n/2 .050 bsc .030 .005 typ n8 package 8-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) n8 0502 .100 (2.54) bsc .065 (1.651) typ .045 ?.065 (1.143 ?1.651) .130 .005 (3.302 0.127) .020 (0.508) min .018 .003 (0.457 0.076) .125 (3.175) min 12 3 4 87 6 5 .255 .015* (6.477 0.381) .400* (10.160) max .009 ?.015 (0.229 ?0.381) .300 ?.325 (7.620 ?8.255) .325 +.035?015 +0.889 0.381 8.255 () note:1. dimensions are inches millimeters *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010 inch (0.254mm) downloaded from: http:///

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