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tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 copyright ? 1993, texas instruments incorporated 1 ? low input offset voltage . . . 0.5 mv max ? low power consumption ? wide common-mode and differential voltage ranges ? low input bias and offset currents ? high input impedance . . . jfet-input stage ? internal frequency compensation ? latch-up-free operation ? high slew rate . . . 18 v/ m s typ ? low total harmonic distortion 0.003% typ description these jfet-input operational amplifiers incorporate well-matched high-voltage jfet and bipolar transistors in a monolithic integrated circuit. they feature low input offset voltage, high slew rate, low input bias and offset currents, and low temperature coefficient of input offset voltage. offset-voltage adjustment is provided for the tl087 and tl088. the c-suffix devices are characterized for operation from 0 c to 70 c, and the i-suffix devices are characterized for operation from 40 c to 85 c. the m-suffix devices are characterized for operation over the full military temperature range of 55 c to 125 c. available options v io max package t a type v io max at 25 c small outline (d) ceramic dip (jg) plastic dip (p) flat (u) 0 c to single 0.5 mv 1 mv tl087cd tl088cd tl087cjg tl088cjg tl087cp tl088cp 70 c dual 0.5 mv 1 mv tl287cd tl288cd tl287cjg tl288cjg tl287cp tl288cp 40 c to single 0.5 mv 1 mv tl087id tl088id tl087ijg tl088ijg tl087ip tl088ip 85 c dual 0.5 mv 1 mv tl287id tl288id tl287ijg tl288ijg TL287IP tl288ip 55 c to single 1 mv tl088mjg tl088mu 125 c dual 1 mv tl288mjg tl288mu the d package is available taped and reeled. add the suffix r to the device type (e.g., tl087cdr). production data information is current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 2 1out 1in 1in+ v cc + out in + in nc no internal connection 1 2 3 4 8 7 6 5 offset n1 in in+ v cc nc v cc+ out offset n2 tl087, tl088 d, jg, or p package (top view) 1 2 3 4 5 10 9 8 7 6 nc offset n1 in in+ v cc nc nc v cc+ out offset n2 tl088m u package (top view) 1 2 3 4 8 7 6 5 v cc + 2out 2in 2in+ tl287, tl288 d, jg, or p package (top view) 1 2 3 4 5 10 9 8 7 6 nc 1out 1in 1in+ v cc nc v cc + 2out 2in 2in+ tl288m u package (top view) symbol (each amplifier)
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 3 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) tl088m tl288m tl087i tl088i tl287i tl288i tl087c tl088c tl287c tl288c unit supply voltage, vcc + (see note 1) 18 18 18 v supply voltage, v cc (see note 1) 18 18 18 v differential input voltage (see note 2) 30 30 30 v input voltage (see notes 1 and 3) 15 15 15 v input current, i i (each input ) 1 1 1 ma output current, i o (each output) 80 80 80 ma total v cc + terminal current 160 160 160 ma total v cc terminal current 160 160 160 ma duration of output short circuit (see note 4) unlimited unlimited unlimited continuous total dissipation see dissipation rating table operating free-air temperature range 55 to 125 25 to 85 0 to 70 c storage temperature range 65 to 150 65 to 150 65 to 150 c lead temperature 1,6 mm (1/16 inch) from case for 60 seconds jg or u package 300 300 300 c lead temperature 1,6 mm (1/16 inch) from case for 10 seconds d or p package 260 260 c notes: 1. all voltage values, except differential voltages, are with respect to the midpoint between v cc+ and v cc . 2. differential voltages are at the noninverting input terminal with respect to the inverting input terminal. 3. the magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 v, whichever is less. 4. the output may be shorted to ground or to either supply. temperature and/or supply voltages must be limited to ensure that th e dissipation rating is not exceeded. dissipation rating table package t a 25 c power rating derating factor above t a = 25 c t a = 70 c power rating t a = 85 c power rating t a = 125 c power rating d 725 mw 5.8 mw/ c 464 mw 377 mw n/a jg 1050 mw 8.4 mw/ c 672 mw 546 mw 210 mw p 1000 mw 8.0 mw/ c 640 mw 520 mw n/a u 675 mw 5.4 mw/ c 432 mw 351 mw 135 mw recommended operating conditions c-suffix i-suffix m-suffix unit min nom max min nom max min nom max unit supply voltage, v cc 5 5 5 5 5 15 v common mode in p ut voltage v ic v cc = 5 v 1 4 1 4 1 4 v common - mode inp u t v oltage , v ic v cc = 15 v 11 11 11 11 11 11 v in p ut voltage v i v cc = 5 v 1 4 1 4 1 4 v inp u t v oltage , v i v cc = 15 v 11 11 11 11 11 11 v operating free-air temperature, t a 0 70 40 85 55 125 c
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 4 post office box 655303 dallas, texas 75265 ? post office box 1443 houston, texas 77001 ? electrical characteristics, v cc = 15 v parameter test conditions 2 tl088m tl288m tl087i tl088i tl287i tl288i tl087c tl088c tl287c tl288c unit min typ max min typ max min typ max r s = 50 w , tl087, tl287 0.1 0.5 0.1 0.5 v o = 0 tl088 tl288 01 3 01 1 01 1 v input offset voltage t a = 25 c tl088 , tl288 0 . 1 3 0 . 1 1 0 . 1 1 mv v io i npu t o ff se t vo lt age r s = 50 w , tl087, tl287 2 1.5 m v v o = 0, tl088 tl288 6 3 25 t a = full range tl088 , tl288 6 3 2 . 5 a vio temperature coefficient r s =50 w t a =25 ctomax 10 8 8 m v/ 5 c a vio of input offset voltage r s = 50 w , t a = 25 c to max 10 8 8 m v/ c i io in p ut offset current t a = 25 c 5 5 100 5 100 pa i io inp u t offset c u rrent t a = full range 25 3 2 na i ib input bias current 3 t a = 25 c 30 30 200 30 200 pa t a = full range 100 20 7 na common mode input v cc + 4 v cc +4 v cc +4 v icr c ommon-mo d e i npu t voltage range t a = 25 c to to to v voltage range v cc + 4 v cc + 4 v cc + 4 maximum peak to peak t a = 25 c, r l = 10 k w 24 27 24 27 24 27 v o(pp) m ax i mum-pea k - t o-pea k out p ut voltage swing t a = full range r l 10 k w 24 24 24 v () out ut voltage swing t a = f u ll range r l 2 k w 20 20 20 r l 2 k w, v o = 10 v, 50 105 50 105 50 105 a vd large-signal differential t a = 25 c 50 105 50 105 50 105 v/mv a vd voltage amplification r l 2 k w, v o = 10 v, 25 25 25 v/mv t a = full range 25 25 25 b 1 unity-gain bandwidth t a = 25 c 3 3 3 mhz r i input resistance t a = 25 c 10 12 10 12 10 12 w cmrr commonmode rejection r s = 50 w, v o = 0 v, 80 93 80 93 80 93 db cmrr j ratio v ic = v icr min, t a = 25 c 80 93 80 93 80 93 db supply voltage rejection r s = 50 w, v o = 0 v, k svr s upp l y vo lt age re j ec ti on ratio ( d v cc / d v io ) v cc = 9 v to 15 v, 80 99 80 99 80 99 db ratio ( d v cc / d v io ) t a = 25 c i cc supply current no load, v o = 0 v, 26 28 26 28 26 28 ma i cc y (per amplifier) t a = 25 c 26 2 . 8 2 . 6 2 . 8 2 . 6 2 . 8 ma 2 all characteristics are measured under openloop conditions with zero common-mode input voltage unless otherwise specified. ful l range for t a is 55 c to 125 c for tl_88m; 40 c to 85 c for tl_8_i; and 0 c to 70 c for tl_8_c. 3 input bias currents of a fet-input operational amplifier are normal junction reverse currents, which are temperature sensitive. pulse techniques must be used that will maintain the junction temperature as close to the ambient temperature as possible.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 5 operating characteristics v cc = 15 v, t a = 25 c parameter test conditions tl088m, tl288m tl087i, tl087c tl088i, tl088c unit min typ max min typ max sr slew rate at unity gain v i = 10 v, c l = 100 pf, r l = 2 k w , a vd = 1 18 8 18 v/ m s t r rise time v i = 20 mv, r l = 2 k w , 55 55 ns overshoot factor c l = 100 pf, a vd = 1 25% 25% v n equivalent input noise voltage r s = 100 w , f = 1 khz 19 19 nv/ hz parameter measurement information v i + v cc + v cc v o c l (see note a) overshoot 10% 90% t r rise time r l note a: c l includes fixture capacitance. figure 1. slew rate, rise/fall time, figure 2. rise time and overshoot and overshoot test circuit waveform v cc v cc + v o c l v o v cc v cc + r s r s 10 k w r l v i 10 k w 100 note a: c l includes fixture capacitance. + + (see note a) figure 3. noise voltage test circuit figure 4. unity-gain brandwidth and phase margin test circuit pa v cc + v cc ground shield pa figure 5. input bias and offset current test circuit +
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 6 typical values typical values as presented in this data sheet represent the median (50% point) of device parametric performance. input bias and offset current at the picoamp bias current level typical of these jfet operational amplifiers, accurate measurement of the bias current becomes difficult. not only does this measurement require a picoammeter, but test socket leakages can easily exceed the actual device bias currents. to accurately measure these small currents, texas instruments uses a two-step process. the socket leakage is measured using picoammeters with bias voltages applied, but with no device in the socket. the device is then inserted in the socket and a second test that measures both the socket leakage and the device input bias current is performed. the two measurements are then subtracted algebraically to determine the bias current of the device.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 7 typical characteristics table of graphs figure a vio temperature coefficient of input offset voltage distribution 6, 7 i io input offset current vs temperature 8 i ib input bias current vs v ic vs temperature 9 8 v i common-mode input voltage range limits vs v cc vs temperature 10 11 v id differential input voltage vs output voltage 12 v om maximum peak output voltage swing vs v cc vs output current vs frequency vs temperature 13 17 14, 15, 16 18 a vd differential voltage amplification vs r l vs frequency vs temperature 19 20 21 z o output impedance vs frequency 24 cmrr common-mode rejection ratio vs frequency vs temperature 22 23 k svr supply-voltage rejection ratio vs temperature 25 i os short-circuit output current vs v cc vs time vs temperature 26 27 28 i cc supply current vs v cc vs temperature 29 30 sr slew rate vs r l vs temperature 31 32 overshoot factor vs c l 33 v n equivalent input noise voltage vs frequency 34 thd total harmonic distortion vs frequency 35 b 1 unity-gain bandwidth vs v cc vs temperature 36 37 f m phase margin vs v cc vs c l vs temperature 38 39 40 phase shift vs frequency 20 pulse response small-signal large-signal 41 42
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 8 typical characteristics 2 25 0 25 20 20 15 10 5 0 5 10 15 20 4 8 12 16 percentage of amplifiers % 30 0 a vio temperature coefficient m v/ c 30 20 20 10 0 10 20 5 10 15 120 units tested from 2 wafer lots v cc = 15 v t a = 25 c to 125 c p package 172 amplifiers tested from 2 wafer lots t a = 25 c to 125 c p package one unit at 34.6 m v/ c a vio temperature coefficient m v/ c distribution of tl088 input offset voltage temperature coefficient distribution of tl288 input offset voltage temperature coefficient percentage of units % v cc = 15 v figure 6 figure 7 t a free-air temperature c iib and iio bias and offset currents na 0.001 25 0.01 0.1 1 10 100 45 65 85 105 125 15 10 iib input bias current na v ic common-mode input voltage v 5 0 5 10 10 5 0 5 10 15 t a = 25 c input bias current and input offset current vs free-air temperature input bias current vs common-mode input voltage v cc = 15 v ib i io i io i ib i v o = 0 v ic = 0 v cc = 15 v ib i figure 8 figure 9 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 9 typical characteristics 2 0 16 vic common-mode input voltqge v | v cc | supply voltage v 75 20 t a free-air temperature c 8 4 0 4 8 12 16 2 4 6 8 10 12 14 16 negative limit positive limit 15 10 5 0 5 10 15 20 50 25 0 25 50 75 100 125 positive limit v cc = 15 v t a = 25 c common-mode input voltage range limits vs supply voltage common-mode input voltage range limits vs free-air temperature v ic 12 vic common-mode input voltqge v v ic ?????? negative limit figure 10 figure 11 400 15 vo output voltage v v id differential input voltage m v 10 5 0 5 10 15 200 0 200 400 v cc = 15 v t a = 25 c r l = 600 w r l = 1 k w r l = 2 k w r l = 10 k w 0 16 vom maximum peak output voltage v |v cc | supply voltage v 12 8 4 0 4 8 12 16 2 4 6 8 10 12 14 16 t a = 25 c v om + r l = 10 k w r l = 2 k w v om r l = 2 k w r l = 10 k w output voltage vs differential input voltage maximum peak output voltage vs supply voltage v o v om figure 12 figure 13 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 10 typical characteristics 2 0 10 k f frequency hz 0 10 k f frequency hz 5 10 15 20 25 30 100 k 1 m 10 m 5 10 15 20 25 30 100 k 1 m 10 m r l = 2 k w t a = 125 c v cc = 5 v t a = 55 c v cc = 15 v v cc = 5 v t a = 25 c r l = 2 k w maximum peak-to-peak output voltage vs frequency maximum peak-to-peak output voltage vs frequency ?????? ?????? v cc = 15 v vopp maximum peak-to-peak output voltage v v o(pp) vopp maximum peak-to-peak output voltage v v o(pp) figure 14 figure 15 maximum peak output voltage vs output current 20 25 30 15 10 5 0 10 k 100 k f frequency hz 1 m 10 m 0 0 vom maximum peak output voltage v | i o | output current ma 50 16 10 20 30 40 2 4 6 8 10 12 14 ???? ???? v om + maximum peak-to-peak output voltage vs frequency v om r l = 10 k w t a = 25 c ?????? ?????? v cc = 15 v ????? v cc = 5 v vopp maximum peak-to-peak output voltage v v o(pp) ??? v om 515253545 v cc = 15 v t a = 25 c figure 16 figure 17 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 11 typical characteristics 2 250 avd differential voltage amplification v/m v 0.4 0 r l load resistance k w 50 100 150 200 1 4 10 40 v o = 1 v t a = 25 c v cc = 15 v v cc = 5 v 75 16 vom maximum peak output voltage v t a free-air temperature c 125 16 50 25 0 25 50 75 100 12 8 4 0 4 8 12 r l = 2 k w r l = 10 k w r l = 10 k w v cc = 15 v ??? ??? v om + v om maximum peak output voltage vs free-air temperature large-signal voltage amplification vs load resistance 100 v om a vd ????? ????? r l = 2 k w figure 18 figure 19 10 f frequency hz 10 m 10 6 100 1 k 10 k 100 k 1 m 0.1 1 10 1 10 4 10 5 75 10 125 1000 50 25 0 25 50 75 100 40 100 400 10 2 10 3 a vd phase shift v cc = 15 v v o = 10 v r l = 2 k w t a free-air temperature c 0 30 60 90 120 150 180 phase shift ????? ????? r l = 10 k w large-signal differential voltage amplification and phase shift vs frequency large-signal voltage amplification vs free-air temperature avd differential voltage amplification v/mv a vd avd differential voltage amplification a vd v cc = 15 v r l = 2 k w c l = 25 pf t a = 25 c figure 20 figure 21 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 12 typical characteristics 2 90 80 70 60 50 40 30 20 10 100 cmrr common-mode rejection ratio db 0 1 m 100 k 10 k 1 k 100 10 m f frequency hz 10 v cc = 15 v t a = 25 c 75 70 t a free-air temperature c 125 100 75 80 85 90 95 50 25 0 25 50 75 100 ?????? ?????? v ic = v icr min v cc = 5 v v cc = 15 v common-mode rejection ratio vs frequency common-mode rejection ratio vs free-air temperature cmrr common-mode rejection ratio db figure 22 figure 23 1 k 0.1 z0 output inppedance 1 m 100 10 k 100 k 1 10 f frequency hz a vd = 100 a vd = 10 a vd = 1 v cc = 15 v t a = 25 c r o (open loop) 250 w 75 90 ksvr supply-voltage rejection ratio db t a free-air temperature c 125 110 50 25 0 25 50 75 100 94 98 102 106 output impedance vs frequency supply-voltage rejection ratio vs free-air temperature svr k w ??????? ??????? v cc = 5 v to 15 v z o figure 24 figure 25 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 13 typical characteristics 2 0 0 60 |v cc | supply voltage v 16 60 2 4 6 8 10 12 14 40 20 0 20 40 time seconds 40 20 20 40 60 60 60 50 40 30 20 10 0 v o = 0 t a = 25 c v id = 1 v t a = 25 c v id = 1 v v cc = 15 v v id = 1 v v id = 1 v ios short-circuit output current ma short-circuit output current vs supply voltage short-circuit output current vs time os i ios short-circuit output current ma os i figure 26 figure 27 0 t a free-air temperature c 40 20 20 40 60 60 100 75 50 25 0 25 50 125 75 v cc = 15 v v cc = 5 v v cc = 5 v v cc = 15 v v id = 1 v v id = 1 v v id = 1 v v id = 1 v v o = 0 short-circuit output current vs free-air temperature ios short-circuit output current ma os i figure 28 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 14 typical characteristics 2 0 0 icc supply current ma | v cc | supply voltage v 16 3 2 4 6 8 10 12 14 0.5 1 1.5 2 2.5 75 0 125 3 50 25 0 25 50 75 100 0.5 1 1.5 2 2.5 t a free-air temperature c t a = 25 c t a = 55 c ta = 125 c v o = 0 no load v cc = 5 v v cc = 15 v v o = 0 no load supply current vs free-air temperature supply current vs supply voltage cc i icc supply current ma cc i figure 29 figure 30 25 0 0.4 sr slew rate v/s r l load resistance k w 5 10 15 20 30 1 4 10 40 100 sr + sr 75 0 t a free-air temperature c 125 30 50 25 0 25 50 75 100 5 10 15 20 25 v cc = 15 v r l = 2 k w c l = 100 pf see figure 1 slew rate vs load resistance slew rate vs free-air temperature v cc = 15 v c l = 100 pf t a = 25 c see figure 1 sr + sr s m sr slew rate v/s s m figure 31 figure 32 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 15 typical characteristics 2 0 0 overshoot factor % c l load capacitance pf 300 50 50 100 150 200 250 10 20 30 40 f frequency hz 10 vn equivalent input noise voltage nv/hz 10 20 30 40 50 70 100 100 1 k 10 k 100 k see figure 1 t a = 25 c r l = 2 k w v i(pp) = 10 mv v cc = 5 v v cc = 15 v overshoot factor vs load capacitance equivalent input noise voltage vs frequency v cc = 15 v r s = 100 w t a = 25 c see figure 3 v n nv/ hz figure 33 figure 34 0 2.7 b1 unity-gain bandwidth mhz | v cc | supply voltage v 16 3.2 2 4 6 8 10 12 14 2.8 2.9 3 3.1 0.001 100 f frequency hz thd total harmonic distortion % 0.01 0.1 1 1 k 10 k 100 k v i = 10 mv r l = 2 k w c l = 25 pf t a = 25 c see figure 4 total harmonic distortion vs frequency unity-gain bandwidth vs supply voltage v cc = 15 v a vd = 1 v o(rms ) = 6 v t a = 25 c b 1 figure 35 figure 36 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 16 typical characteristics 2 75 0 t a free-air temperature c 125 4 50 25 0 25 50 75 100 1 2 3 0 55 m phase margin 16 65 2 4 6 8 10 12 14 57 59 61 63 |v cc | supply voltage v see figure 4 v i = 10 mv r l = 2 k w c l = 25 pf v cc = 15 v v cc = 5 v see figure 4 t a = 25 c c l = 25 pf r l = 2 k w v i = 10 mv unity-gain bandwidth vs free-air temperature phase margin vs supply voltage b1 unity-gain bandwidth mhz b 1 m f figure 37 figure 38 v i = 10 mv 0 40 c l load capacitance pf 100 70 10 20 30 40 50 60 70 80 90 45 50 55 60 65 75 55 t a free-air temperature c 125 65 50 25 0 25 50 75 100 57 59 61 63 v i = 10 mv r l = 2 k w t a = 25 c see figure 4 v cc = 15 v c l = 25 pf r l = 2 k w see figure 4 v cc = 15 v v cc = 5 v v cc = 5 v phase margin vs load capacitance phase margin vs free-air temperature m phase margin m f m phase margin m f figure 39 figure 40 2 data at high and low temperatures are applicable within the rated operating free-air temperature ranges of the various devices.
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 17 typical characteristics 8 t time m s 6 8 0 1 2 3 4 5 6 4 2 0 2 4 6 16 vo output voltage mv t time m s 1.2 16 0 0.2 0.4 0.6 0.8 1.0 12 8 4 0 4 8 12 v cc = 15 v r l = 2 k w c l = 100 pf t a = 25 c see figure 1 v cc = 15 v r l = 2 k w c l = 100 pf t a = 25 c see figure 1 voltage-follower small-signal pulse response voltage-follower large-signal pulse response v o vo output voltage mv v o figure 41 figure 42
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 18 typical application data output characteristics all operating characteristics are specified with 100-pf load capacitance. these amplifiers will drive higher capacitive loads; however, as the load capacitance increases, the resulting response pole occurs at lower frequencies, thereby causing ringing, peaking, or even oscillation. the value of the load capacitance at which oscillation occurs varies with production lots. if an application appears to be sensitive to oscillation due to load capacitance, adding a small resistance in series with the load should alleviate the problem. capacitive loads of 1000 pf and larger may be driven if enough resistance is added in series with the output (see figure 43). (a) c l = 100 pf, r = 0 (b) c l = 300 pf, r = 0 (c) c l = 350 pf, r = 0 (d) c l = 1000 pf, r = 0 (e) c l = 1000 pf, r = 50 w (f) c l = 1000 pf, r = 2 k w figure 43. effect of capacitive loads + 5 v 5 v 15 v 15 v 2 k w v o r note a: c l includes fixture capacitance c l (see note a) figure 44. test circuit for output characteristics
tl087, tl088, tl287, tl288 jfet-input operational amplifiers slos082a d2484, march 1979 revised january 1993 post office box 655303 ? dallas, texas 75265 19 typical application data input characteristics these amplifiers are specified with a minimum and a maximum input voltage that, if exceeded at either input, could cause the device to malfunction. because of the extremely high input impedance and resulting low bias current requirements, these amplifiers are well suited for low-level signal processing; however, leakage currents on printed circuit boards and sockets can easily exceed bias current requirements and cause degradation in system performance. it is good practice to include guard rings around inputs (see figure 45). these guards should be driven from a low-impedance source at the same voltage level as the common-mode input. + + + v o v o v o v i v i (a) noninverting amplifier (b) inverting amplifier (c) unitygain amplifier v i figure 45. use of guard rings noise performance the noise specifications in op amp circuits are greatly dependent on the current in the first-stage diflferential amplifier. the low input bias current requirments of these amplifiers result in a very low current noise. this feature makes the devices especially favorable over bipolar devices when using values of circuit impedance greater than 50 k w .
important notice texas instruments (ti) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current and complete. ti warrants performance of its semiconductor products and related software to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (acritical applicationso). ti semiconductor products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. inclusion of ti products in such applications is understood to be fully at the risk of the customer. use of ti products in such applications requires the written approval of an appropriate ti officer. questions concerning potential risk applications should be directed to ti through a local sc sales office. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. nor does ti warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. copyright ? 1998, texas instruments incorporated

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