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pin connections rev. c information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. a ultraprecision operational amplifier OP177 features ultralow offset voltage: t a = 25 c: 25 v max outstanding offset voltage drift: 0.1 v/ c max excellent open-loop gain and gain linearity: 12 v/ v typ cmrr: 130 db min psrr: 115 db min low supply current: 2.0 ma max fits industry standard precision op amp sockets (op07/op77) general description the OP177 features the highest precision performance of any op amp currently available. offset voltage of the OP177 is only 25 v max at room temperature. the ultralow v os of the OP177 combines with its exceptional offset voltage drift (tcv os ) of 0.1 v/ c max to eliminate the need for external v os adjustment and increases system accuracy over temperature. the OP177s open-loop gain of 12 v/ v is maintained over the full 10 v output range. cmrr of 130 db min, psrr of 120 db min, and maximum supply current of 2 ma are just a few examples of the excellent performance of this operational amplifier. the OP177s combination of outstanding specifications ensures accurate performance in high closed-loop gain applications. this low noise bipolar input op amp is also a cost effective alte rnative to chopper-stabilized amplifiers. the OP177 provides chopper-type performance without the usual problems of high noise, low frequency chopper spikes, large physical size, limited common-mode input voltage range, and bulky external storage capacitors. the OP177 is offered in the C40 c to +85 c extended industrial temperature ranges. this product is available in 8-pin epoxy dips, as well as the space saving 8-pin small- outline (so). 2b c1 r7 (optiona l null) q19 r2b * r2a * r1b r1a r9 r10 output r8 r6 c3 c2 q13 q17 r5 q27 q26 q25 q8 q7 q23 q24 q21 q22 q9 q4 q6 q3 q5 r3 r4 q1 q2 q11 q12 q14 q10 q16 q15 q18 q20 v+ v noninverting input inverting input * note: r2a and r2b are electronically adjusted on chip at factory. figure 1. simplified schematic epoxy mini-dip (p suffix) 8-pin so (s-suffix) 8 7 6 5 1 2 3 4 nc = no connect v os trim in +in v os tri m v+ out nc v one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 www.analog.com fax: 781/326-8703 ? analog devices, inc., 2002
OP177 %&% OP177f OP177g parameter symbol conditions min typ max min typ max unit input offset voltage v os 10 25 20 60 v long-term input offset voltage stability v os /time 0.3 0.4 v/mo input offset 1 current i os 0.3 1.5 0.3 2.8 na input bias current i b e0.2 1.2 2 e0.2 1.2 2.8 na input noise voltage e n f o = 1 hz to 100 hz 2 118 150 118 150 nv rms input noise current i n f o = 1 hz to 100 hz 2 38 38 pa rms input resistance differential- mode 3 r in 26 45 18.5 45 m input resistance common-mode r incm 200 200 g input voltage range 4 ivr 13 14 13 14 v common-mode rejection ratio cmrr v cm = 13 v 130 140 115 140 db power supply rejection ratio psrr v s = 3 v to 18 v 115 125 110 120 db large signal voltage gain a vo r l 2 k , 5000 12000 2000 6000 v/mv v o = 610 v 5 output voltage swing v o r l 10 k 13.5 14.0 13.5 14.0 v r l 2 k 12.5 13.0 12.5 13.0 v r l 1 k 12.0 12.5 12.0 12.5 v slew rate 2 sr r l 2 k 0.1 0.3 0.1 0.3 v/ s closed-loop bandwidth 2 bw a vcl = 1 0.4 0.6 0.4 0.6 mhz open-loop output resistance r o 60 60 electrical characteristics (@ v s = 15 v, t a = 25 c, unless otherwise noted.)
OP177 %'% power consumption p d v s = 15 v, no load 50 60 50 60 mw vs = 3 v, no load 3.5 4.5 3.5 4.5 mw supply current i sy v s = 15 v, no load 1.6 2 1.6 2 ma offset adjustment range r p = 20 k 3 3mv notes 1 long-term input offset voltage stability refers to the averaged trend line of v os versus time over extended periods after the first 30 days of operation. excluding the initial hour of operation, changes in v os during the first 30 operating days are typically less than 2.0 v. 2 sample tested. 3 guaranteed by design. 4 guaranteed by cmrr test condition. 5 to ensure high open-loop gain throughout the 10 v output range, a vo is tested at e10 v v o 0 v, 0 v v o +10 v, and e10 v v o +10 v. specifications subject to change without notice.
OP177especifications %(% electrical characteristics OP177f OP177g parameter symbol conditions min typ max min typ max uni t input offset voltage v os 15 40 20 100 v average input offset voltage drift 1 tcv os 0.1 0.3 0.7 1.2 v/ c input offset current i os 0.5 2.2 0.5 4.5 na average input offset current drift 2 tci os 1.5 40 1.5 85 pa/ c input bias current i b e0.2 2.4 4 2.4 6na average input bias current drift 2 tci b 8 40 15 60 pa/ c input voltage range 3 ivr 13 13.5 13 13.5 v common-mode rejection ratio cmrr v cm = 13 v 120 140 110 140 db power supply rejection ratio pssr v s = 3 v to 18 v 110 120 106 115 db large-signal voltage gain 4 a vo r l 2 k , v o = 10 v 2000 6000 1000 4000 v/mv output voltage swing v o r l 2/k 12 13 12 13 v power consumption p d v s = 15 v, no load 60 75 60 75 mw supply current i sy v s = 15 v, no load 20 2.5 2 2.5 ma notes 1 OP177tcv os is sample tested. 2 guaranteed by endpoint limits. 3 guaranteed by cmrr test condition. 4 to ensure high open-loop gain throughout the 10 v output range, a vo is tested at e10 v v o 0 v, 0 v v o +10 v, and e10 v v o +10 v. specifications subject to change without notice. OP177 200k 50 v o v os = vo 4000 e + "
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OP177 20k v+ output e + e + input v os trim range is typically 3.0mv v e "
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(@ v s = 15 v, e40 c t a 85 c, unless otherwise noted.)
OP177 %+% absolute maximum ratings supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 v internal power dissipation 1 . . . . . . . . . . . . . . . . . . . 500 mw differential input voltage . . . . . . . . . . . . . . . . . . . . . . 30 v input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 v output short-circuit duration . . . . . . . . . . . . . . . . indefinite storage temperature range s, p package . . . . . . . . . . . . . . . . . . . . . . . e65 c to +125 c operating temperature range OP177f, OP177g . . . . . . . . . . . . . . . . . . e40 c to +85 c lead temperature range (soldering, 60 sec) . . . . . . . 300 c dice junction temperature (t j ) . . . . . . . . e65 c to +150 c package type ja 2 jc unit 8-pin plastic dip (p) 103 43 c/w 8-pin so (s) 158 43 c/w notes 1 for supply voltages less than 22 v, the absolute maximum input voltage is equal to the supply voltage. 2 ja is specified for worst-case mounting conditions, i.e., ja is specified for device in socket for p-dip; ja is specified for device soldered to printed circuit board for so package. ordering guide temperature package package model range description option OP177fp e40 c to +85 c 8-pin plastic dip n-8 OP177gp e40 c to +85 c 8-pin plastic dip n-8 OP177fs e40 c to +85 c 8-pin so so-8 OP177gs e40 c to +85 c 8-pin so so-8 OP177 20k e + pinouts shown for p and z packages e 20v +20v null "
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OP177 %2% application information gain linearity the actual open-loop gain of most monolithic op amps varies at different output voltages. this nonlinearity causes errors in high closed-loop gain circuits. it is important to know that the manufacturer?s a vo specifi- cation is only a part of the solution, since all automated testers use endpoint testing and, therefore, show only the average gain. for example, figure 5 shows a typical precision op amp with a respectable open-loop gain of 650 v/mv. however, the gain is not constant through the output voltage range, causing nonlinear errors. an ideal op amp would show a horizontal scope trace. v y v x e 10v 0v +10v "
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OP177 e + v y v x 10k 10k 1m 10 r l v in = 10v "
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figure 6 shows the OP177?s output gain linearity trace with its truly impressive average a vo of 12000 v/mv. the output trace is virtually horizontal at all points, assuring extremely high gain accuracy. adi also performs additional testing to ensure consistent high open-loop gain at various output voltages. figure 7 is a simple open-loop gain test circuit for your own evaluation. thermocouple amplifier with cold-junction compensation an example of a precision circuit is a thermocouple amplifier that must amplify very low level signals accurately without introducing linearity and offset errors to the circuit. in this circuit, an s-type thermocouple, which has a seebeck coef- ficient of 10.3 v/ c, produces 10.3 mv of output voltage at a temperature of 1000 c. the amplifier gain is set at 973.16. thus, it will produce an output voltage of 10.024 v. extended temperature ranges to beyond 1500 c can be accomplished by reducing the amplifier gain. the circuit uses a low-cost diode to sense the temperature at the terminating junctions and, in turn, compensates for any ambient temperature change. the OP177, with its high open-loop gain, plus low offset voltage and drift combines to yield a very precision temperature sensing circuit. circuit values for other thermocouple types are shown in table i. table i. thermo- seebeck couple type coefficient r1 r2 r7 r9 k 39.2 v/ c 110 5.76 k 102 k 269 k j 50.2 v/ c 100 4.02 k 80.6 k 200 k s 10.3 v/ c 100 20.5 k 392 k 1.07 m OP177 v out e + e 15v 10 f 0.1 f +15v 10 f 0.1 f r 9 1.07m 0.05% r 4 50 1% r 5 100 (zero adjust- ment) analog ground analog ground r 7 392k 1% 10 f r 8 1.0k 0.05% r 1 100 1% r 2 20.5k 1% + 10 f copper copper isothermal block cold-junction compensation r 3 47k 1% ref01 2.2 f + +15v 6 4 2 10.000v e + types isothermal cold- junctions "
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@ precision high gain differential amplifier the high gain, gain linearity, cmrr, and low tcv os of the OP177 make it possible to obtain performance not previously available in single stage, very high gain amplifier applications. see figure 9. for best cmr, r 1 r 2 must equal r 3 r 4 . in this example, with a 10 mv differential signal, the maximum errors are as listed in table ii.
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table ii. high gain differential amp performance type amount common-mode voltage 0.1%/v gain linearity, worst case 0.02% tcv os 0.0003%/ c tci os 0.008%/ c isolating large capacitive loads the circuit in figure 10 reduces maximum slew rate but allows driving capacitive loads of any size without instability. because the 100 resistor is inside the feedback loop, its effect on output impedance is reduced to insignificance by the high open- loop gain of the OP177. "
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OP177 %#>% bilateral current source the current sources shown in figure 11 will supply both positive and negative current into a grounded load. note that z o r 5 r 4 r 2 1
r 5 r 4 r 2 e r 3 r 1 and that for z o to be infinite, r 5 r 4 r 2 must r 3 r 1 precision absolute value amplifier the high gain and low tcv os assure accurate operation with inputs from microvolts to volts. in this circuit, the signal always appears as a common-mode signal to the op amps. see figure 12. precision positive peak detector in figure 13, the c h must be of polystyrene, teflon, 4 or polyethylene to minimize dielectric absorption and leakage. the droop rate is determined by the size of c h and the bias current of the op41. precision threshold detector/amplifier in figure 14, when v in < v th , amplifier output swings nega- tive, reverse biasing diode d 1 . v out = v th if r l = . when v in v th , the loop closes, v out v th v in e v th 1 r f r s
c c is selected to smooth the response of the loop. 4 teflon is a registered trademark of dupont. "
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OP177 %##% outline dimensions dimensions shown in inches and (mm). 8-pin plastic dip (n-8) pin 1 0.280 (7.11) 0.240 (6.10) 4 5 8 1 seating plane 0.060 (1.52) 0.015 (0.38) 0.130 (3.30) min 0.210 (5.33) max 0.160 (4.06) 0.115 (2.93) 0.430 (10.92) 0.348 (8.84) 0.022 (0.558) 0.014 (0.356) 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) bsc 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) 8-pin so (so-08) 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 ? 0 ? 0.0196 (0.50) 0.0099 (0.25) x 45 ? pin 1 0.1574 (4.00) 0.1497 (3.80) 0.2440 (6.20) 0.2284 (5.80) 4 5 1 8 0.0192 (0.49) 0.0138 (0.35) 0.0500 (1.27) bsc 0.0688 (1.75) 0.0532 (1.35) 0.0098 (0.25) 0.0040 (0.10) 0.1968 (5.00) 0.1890 (4.80) revision history location page 01/30?data sheet changed from rev. b to rev. c. edits to features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 edits to general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 edits to pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 edits to electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 3 global deletion of references to OP177e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 4, 10 edits to absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 edits to package type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 edits to ordering guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 edit to outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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