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1 lt1097 low cost, low power precision op amp features descriptio n u n offset voltage 50 m v max n offset voltage drift 1 m v/ c max n bias current 250pa max n offset current 250pa max n bias and offset current drift 4pa/ c max n supply current 560 m a max n 0.1hz to 10hz noise 0.5 m vp-p, 2.2pap-p n cmrr 115db min n voltage gain 117db min n psrr 114db min n guaranteed operation on two nicad batteries applicatio n s u n replaces op-07/op-77/op-97/op-177/ad707/ lt1001 with improved price/performance n high impedance difference amplifiers n logarithmic amplifiers (wide dynamic range) n thermocouple amplifiers n precision instrumentation n active filters (with small capacitors) typical applicatio n u , ltc and lt are registered trademarks of linear technology corporation. lt ? 1097 achieves a new standard in combining low price and outstanding precision performance. on all operational amplifier data sheets, the specifications listed on the front page are for highly selected, expensive grades, while the specs for the low cost grades are buried deep in the data sheet. the lt1097 does not have any selected grades, the outstanding specifications shown in the features section are for its only grade. the design effort of the lt1097 concentrated on optimiz- ing the performance of all precision specsat only 350 m a of supply current. typical values are 10 m v offset voltage, 40pa bias and offset currents, 0.2 m v/ c and 0.4pa/ c drift. common mode and power supply rejections, voltage gain are typically in excess of 128db. all parameters that are important for precision, low power op amps have been optimized. consequently, using the lt1097 error budget calculations in most applications is unnecessary. + 9v out = 1.1v to 8.0v as 1.8k r2 135k lt1097?a01 4 2 3 7 6 r1 20k r2 1.018235v 2n3609 saturated standard cell #101 eppley labs newport, r. i. the typical 40pa bias current of the lt1097 will degrade the standard cell by only 1ppm/year. noise is a fraction of a ppm. unprotected gate mosfet isolates standard cell on power down. + lt1097 input offset voltage ( m v) ?0 ?0 ?0 ?0 ?0 0 10 20 30 40 50 percent of units lt1097 ?g01 50 40 30 20 10 0 v s = 15v t a = 25 c 6,500 units in so package 6,680 units in plastic dip 13,180 units tested input offset voltage distribution saturated standard cell amplifier
2 lt1097 absolute m axi m u m ratings w ww u package/order i n for m atio n w u u order part number lt1097cn8 supply voltage ...................................................... 20v differential input current (note 1) ...................... 10ma input voltage ......................................................... 20v output short circuit duration .......................... indefinite 1 2 3 4 8 7 6 5 top view v os trim ?n +in v v os trim v + out over comp n8 package 8-lead plastic dip 1 2 3 4 8 7 6 5 top view s8 package 8-lead plastic so v os trim ?n +in v v os trim v + out over comp order part number lt1097s8 electrical characteristics v s = 15v, v cm = 0v, t a = 25 c, unless otherwise noted. lt1097cn8 lt1097s8 symbol parameter conditions min typ max min typ max units v os input offset voltage 10 50 10 60 m v d v os long term input offset 0.3 0.3 m v/mo d time voltage stability i os input offset current 40 250 60 350 pa i b input bias current 40 250 50 350 pa e n input noise voltage 0.1hz to 10hz 0.5 0.5 m vp-p input noise voltage density f o = 10hz 16 16 nv/ ? hz f o = 1000hz 14 14 nv/ ? hz i n input noise current 0.1hz to 10hz 2.2 2.4 pap-p input noise current density f o = 10hz 0.03 0.035 pa/ ? hz f o = 1000hz 0.008 0.008 pa/ ? hz input resistance (note 2) differential mode 30 80 25 70 m w common mode 10 12 8?10 11 w input voltage range 13.5 14.3 13.5 14.3 v cmrr common mode rejection ratio v cm = 13.5v 115 130 115 130 db psrr power supply rejection ratio v s = 1.2v to 20v 114 130 114 130 db a vol large signal voltage gain v o = 12v, r l = 10k 700 2500 700 2500 v/mv v o = 10v, r l = 2k 250 1000 250 1000 v/mv v out output voltage swing r l = 10k 13 13.8 13 13.8 v r l = 2k 11.5 13 11.5 13 v sr slew rate 0.1 0.2 0.1 0.2 v/ m s gbw gain bandwidth product 700 700 khz i s supply current 350 560 350 560 m a offset adjustment range r pot = 10k, wiper to v + 600 600 m v minimum supply voltage (note 3) 1.2 1.2 v operating temperature range .................C40 c to 85 c storage temperature range ..................C65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c
3 lt1097 electrical characteristics v s = 15v, v cm = 0v, 0 c t a 70 c, unless otherwise noted. lt1097cn8 lt1097s8 symbol parameter conditions min typ max min typ max units v os input offset voltage l 20 100 20 130 m v average temperature coefficient of (note 4) l 0.2 1 0.2 1.4 m v/ c input offset voltage i os input offset current l 60 430 75 570 pa average temperature coefficient of (note 4) l 0.4 4 0.5 5 pa/ c input offset current i b input bias current l 60 430 75 570 pa average temperature coefficient of (note 4) l 0.4 4 0.5 5 pa/ c input bias current a vol large signal voltage gain v out = 12v, r l 3 10k l 450 2000 450 2000 v/mv v out = 10v, r l 3 2k l 180 800 180 800 v/mv cmrr common mode rejection ratio v cm = 13.5v l 112 128 112 128 db psrr power supply rejection ratio v s = 1.3v to 20v l 111 128 111 128 db input voltage range l 13.5 14.2 13.5 14.2 v v out output voltage swing r l = 10k l 13 13.7 13 13.7 v i s supply current l 380 700 380 700 m a electrical characteristics v s = 15v, v cm = 0v, C40 c t a 85 c, unless otherwise noted. (note 5) lt1097cn8 lt1097s8 symbol parameter conditions min typ max min typ max units v os input offset voltage l 25 130 30 170 m v average temperature coefficient of l 0.3 1.2 0.3 1.6 m v/ c input offset voltage i os input offset current l 70 600 85 750 pa average temperature coefficient of l 0.5 5 0.6 6 pa/ c input offset current i b input bias current l 70 600 85 750 pa average temperature coefficient of l 0.5 5 0.6 6 pa/ c input bias current a vol large signal voltage gain v out = 12v, r l 3 10k l 300 1700 300 1700 v/mv v out = 10v, r l 3 2k l 700 700 v/mv cmrr common mode rejection ratio v cm = 13.5v l 108 127 108 127 db psrr power supply rejection ratio v s = 1.5v to 20v l 108 127 108 127 db input voltage range l 13.5 14 13.5 14 v v out output voltage swing r l = 10k l 13 13.6 13 13.6 v i s supply current l 400 800 400 800 m a the l denotes specifications which apply over the full operating temperature range. note 1: differential input voltages greater than 1v will cause excessive current to flow through the input protection diodes unless limiting resistance is used. note 2: this parameter is guaranteed by design and is not tested. note 3: power supply rejection ratio is measured at the minimum supply voltage. note 4: this parameter is not 100% tested. note 5: the lt1097 is designed, characterized and expected to meet these extended temperature limits, but is not tested at C40 c and 85 c. guaranteed i grade parts are available; consult factory.
4 lt1097 typical perfor m a n ce characteristics u w distribution to offset voltage drift with temperature input bias current vs temperature minimum supply voltage, common mode range and voltage swing at v min warm-up drift input bias current over common mode range offset voltage drift with temperature ( m v/ c) ?.5 ?.2 ?.9 ?.6 ?.3 0 0.3 0.6 0.9 1.2 1.5 percent of units lt1097 ?g02 50 40 30 20 10 0 v s = 15v 240 units tested in n8 packages from six runs time after power on (minutes) 012345 change in offset voltage ( m v) 1097 ?g05 5 4 3 2 1 0 v s = 15v t a = 25 c plastic-in-line package plastic (n) or so (s) temperature ( c) ?0 0 50 ?5 25 75 100 input bias current (pa) 1097 ?g03 200 100 0 ?00 ?00 ?00 undercancelled unit overcancelled unit temperature ( c) ?0 ?0 20 50 80 110 common mode range or output swing (v) 1097 ?g04 minimum supply voltage, v min (v) v + v + ?.2 v + ?.4 v + ?.6 v + ?.8 v +0.8 v +0.6 v +0.4 v +0.2 v 1.4 1.2 1.0 0.8 cm range cm range swing r l = 10k swing common mode input voltage ?5 ? 5 ?0 0 10 15 input bias current (pa) 1097 ?g06 120 80 40 0 ?0 ?0 ?20 v s = 15v t a = 25 c r in cm = 10 12 w device with positive input current device with negative input current v cm i b +
5 lt1097 output short circuit current vs time typical perfor m a n ce characteristics u w 0.1hz to 10hz noise 0.01hz to 10hz noise noise spectrum time (seconds) 0246810 noise voltage (0.4 m v/div) 1097 ?g08 v s = 1.2v to 20v t a = 25 c time from output short (minutes) 0123 short circuit current (ma) sinking sourcing 1097 ?g07 20 15 10 5 0 ? ?0 ?5 ?0 v s = 15v t a = 25 c time (seconds) 0 20406080100 noise voltage (0.4 m v/div) 0.4 m v 1097 ?g09 v s = 1.2v to 20v t a = 25 c frequency (hz) 1 1 10 100 1000 10 100 1000 1097 ?g10 voltage noise density (nv ? hz) current noise density (fa ? hz) t a = 25 c v s = 1.2v to 20v voltage noise 1/f corner 2.5hz 1/f corner 140hz current noise output voltage (v) ?5 ? 5 ?0 0 10 15 change in offset voltage ( m v) 1097 ?g11 ?0 ?0 ?0 0 10 20 30 v s = 15 v t a = 25 c r l = 10k r l = 10k r l = 2k r l = 2k voltage gain
6 lt1097 frequency (hz) 0.01 0.1 1 10 100 1k 10k 100k 1m 10m voltage gain (db) 1097 ?g12 140 120 100 80 60 40 20 0 ?0 v s = 15v t a = 25 c frequency (mhz) 0.01 gain (db) 40 30 20 10 0 ?0 phase shift (degrees) 100 120 140 160 180 200 0.1 1 10 1097 ?g13 v s = 15v t a = 25 c phase gain phase margin = 70 c frequency (hz) 1 10 100 1k 10k 100k 1m common mode rejction ratio (db) 1097 ?g14 140 120 100 80 60 40 20 0 v s = 15v t a = 25 c frequency (hz) 0.1 1 10 100 1k 10k 100k 1m power supply rejection ratio (db) 1097 ?g15 140 120 100 80 60 40 20 v s = 15v t a = 25 c positive supply negative supply overcompensation capacitor (pf) slew rate (v/ m s) 1 100 1000 10000 1097 ?g16 10 1 0.1 0.01 0.001 gain bandwidth product (khz) 1000 100 10 1 v s = 15v t a = 25 c slew gbw voltage gain vs frequency gain, phase shift vs frequency common mode rejection vs frequency power supply rejection vs frequency slew rate, gain bandwidth product vs overcompensation capacitor typical perfor m a n ce characteristics u w
7 lt1097 capacitive load (pf) 10 overshoot (%) 70 60 50 40 30 20 10 0 100 1000 10,000 1097 g19 t a = 25 c v s = 15v c s : pin 5 to ground a v = 1 c s = 0 a v = 1 c s = 200pf a v = 10 c s = 0 a v = 1, c load = 100pf, 5 m s/div 20mv/div 1097 g17 a v = 1, 20 m s/div 2v/div 1097 g18 small signal transient response large signal transient response capacitive load handling typical perfor m a n ce characteristics u w
8 lt1097 q27 1.5k 2.5k 30pf 1 trim 800 w 30k 8 trim 5 over comp 6 out 800 w 30k 1.3k 35 a 20 a 80 a 2 in 3 + in 15 a sss q3 q1 q9 q10 q2 q5 q6 s 80 a 5 a 5 a q11 q24 q12 q21 q22 q20 q23 q4 q7 q8 q13 1.5k 50k 3k j1 q16 q17 q18 q15 3.7k 3.7k 3.7k 16k q14 q19 1.5k 40 w 40 w 1.5k q29 q33 q28 q31 q30 q26 40 w 330 w q1?4 are supergain transistors 1097 bd q32 100 w 7 v + q25 4 v sche m atic diagra m w w
9 lt1097 15v ?5v out lt1097?01 4 3 2 7 6 50k 50k 50k 50k +in ?n + lt1097 v out v+ lt1097?02 4 5 c s 1 3 2 10k pot 8 7 6 + lt1097 frequency compensation and optional offset nulling 27v common mode range difference amplifier applicatio n s i n for m atio n wu u u guaranteed perfomance, v s = 15v, t a = 25 c parameter lt1097cn8 op-77gp ad707jn op-177gp op-97fp units error terms v os max 50 100 90 60 75 m v i os max?25k 6 70 50 70 4 m v gain min, 10v out 14 5 3 5 50 m v cmrr, min, 25v in 22 20 13 22 39 m v psrr, min, v s = 15v 10% 69999 m v sum of all error terms 98 204 165 166 177 m v 0.1hz to 10hz noise voltage noise 0.5 0.38 0.23 0.38 0.5 m vp-p typ current noise?50k 0.11 0.75 0.7 0.75 0.1 m vp-p typ resistor noise 0.55 0.55 0.55 0.55 0.55 m vp-p typ rms sum 0.75 1 0.92 1 0.75 m vp-p drift with temp tcv os max 1 1.2 1 1.2 2 m v/ c tci os max?25k 0.1 2.1 1 2.1 0.2 m v/ c sum of drift terms 1.1 3.3 2 3.3 2.2 m v/ c supply current max 0.56 2 3 2 0.6 ma the lt1097 is pin compatible to and directly replaces such precision op amps as the op-07, op-77, ad707, op-97, op- 177, lm607 and lt1001 with improved price/performance. compatibility includes externally nulling the offset voltage, as all of the above devices are trimmed with a potentiometer between pin 1 and pin 8 and the wiper tied to v + . the simple difference amplifier can be used to illustrate the all-around excellence of the lt1097. the 50k input resistance is selected to be large enough compared to input signal source resistance. simultaneously, the 50k resistors should not dominate the precision and noise error budget. assuming perfect matching between the four resistors, the following table summarizes the input referred performance obtained using the lt1097 and other popular, low cost precision op amps. input offset voltage can be adjusted over a 600 m v range with a 10k potentiometer. the lt1097 is internally compensated for unity gain stability. as shown on the capacitive load handling plot, the lt1097 is stable with any capacitive load. however, the overcompensation capacitor, c s , can be used to re- duce overshoot with heavy capacitive loads, to narrow noise bandwidth or to stabilize circuits with gain in the feedback loop.
10 lt1097 applicatio n s i n for m atio n wu u u out lt1097?03 5 0.01 m f 3 in 2 6 50pf 10k 5k + lt1097 15v ?5v v o v o = 1000v os *resistors must have low thermoelectric potential lt1097?04 4 3 2 7 6 50k* 100 w * 50k* + lt1097 pulse response of feedforward compensation test circuit for offset voltage and its drift with temperature follower feedforward compensation 5 m s/div 5v/div 1097 g20 the availability of the compensation terminal permits the use of feedforward frequency compensation to enhance slew rate. the voltage follower feedforward scheme bypasses the amplifiers gain stages and slews at nearly 10v/ m s. the inputs of the lt1097 are protected with back-to-back diodes. in the voltage follower configuration, when the input is driven by a fast, large signal pulse (>1v), the input protection diodes effectively short the output to the input during slewing, and a current, limited only by the output short circuit protection will flow through the diodes. the use of a feedback resistor, as shown in the voltage follower feedforward diagram, is recommended because this resistor keeps the current below the short circuit limit, resulting in faster recovery and settling of the output. ?v out 2n3904 620k lt1097?a02 4 3 2 1 7 5v 6 1k 330k 100k 10k 10k ?n +in + lt1097 100k low power comparator with <10 m v hysteresis u typical applicatio
11 lt1097 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. package descriptio n u dimensions in inches (millimeters) unless otherwise noted. n8 1197 0.100 0.010 (2.540 0.254) 0.065 (1.651) typ 0.045 ?0.065 (1.143 ?1.651) 0.130 0.005 (3.302 0.127) 0.020 (0.508) min 0.018 0.003 (0.457 0.076) 0.125 (3.175) min 12 3 4 87 6 5 0.255 0.015* (6.477 0.381) 0.400* (10.160) max 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.035 0.015 +0.889 0.381 8.255 () *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm) 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) 0.016 ?0.050 0.406 ?1.270 0.010 ?0.020 (0.254 ?0.508) 45 0 ?8 typ 0.008 ?0.010 (0.203 ?0.254) so8 0996 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) typ dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side * ** n8 package 8-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510) s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610)
12 lt1097 1097fas sn1097 lt/tp 0398 2k rev a ? printed in usa ? linear technology corporation 1989 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 l (408) 432-1900 fax: (408) 434-0507 l telex: 499-3977 l www.linear-tech.com related parts part number description comments lt1490/lt1491 dual/quad general purpose micropower rail-to-rail op amps over-the-top tm inputs, 50 m a supply current per amplifier, 2v to 44v supply range, 180khz gbw lt1492/lt1493 dual/quad 5mhz low power single supply op amps 180 m v v os max, 3v/ m s slew rate, 550 m a supply per amplifier lt1077 single micropower low v os op amp 60 m v v os max, 68 m a supply current, 230khz gbw, optimized for 5v supplies ?v 1k* 1000pf lt1097?a03 4 5 3 2 7 6 9k* 15v 100k 5% 10k 90k 900k 9m 0.1v in 10v 1v 100v 1000v 0.1v 10v 1v 100v 1000v to 1v full scale analog digital converter *ratio match 0.01% fn507 allen bradley decade voltage divider this application requires low bias current and offset voltage, low noise, and low drift with time and temperature. + lt1097 input amplifier for 4 1/2 digit voltmeter u typical applicatio over-the-top is a trademark of linear technology corporation.

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