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rev. b 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 op90 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700www.analog.com fax: 781/326-8703 ? analog devices, inc., 2002 precision low-voltage micropower operational amplifier pin connections 8-lead hermetic dip (z-suffix) 8-lead epoxy mini-dip (p-suffix) 8-lead so (s-suffix) 8 7 6 5 1 2 3 4 nc = no connect v os null ?n +in nc v+ out v os null v features single/dual supply operation: 1.6 v to 36 v, 0.8 v to 18 v true single-supply operation; input and output voltage ranges include ground low supply current: 20 a max high output drive: 5 ma min low input offset voltage: 150 v max high open-loop gain: 700 v/mv min outstanding psrr: 5.6 v/v max standard 741 pinout with nulling to vC general description the op90 is a high performance, micropower op amp that operates from a single supply of 1.6 v to 36 v or from dual supplies of 0.8 v to 18 v. the input voltage range includes the negative rail allowing the op90 to accommodate input signals down to ground in a single-supply operation. the o p90? output swing also includes a ground when operating from a single-supply, enabling ?ero-in, zero-out?operation. the op90 draws less than 20 a of quiescent supply current, while able to deliver over 5 ma of output current to a load. the input offset voltage is below 150 v eliminating the need for * electronically adjusted on chip for minimum offset voltage null null ?n +in v+ output v ** figure 1. simplied schematic external nulling. gain exceeds 700,000 and common-mode rejection is better than 100 db. the power supply rejection ratio of un der 5.6 v/v minimizes offset voltage changes experi- enced in bat tery-powered systems. the low offset voltage and high gain offered by the op90 bring precision performance to micropower applications. the minimal voltage and current requirements of the op90 suit it for battery and solar powered applications, such as portable instruments, remote sensors, and satellites.
rev. b ?2? op90 (v s = 1.5 v to 15 v, t a = 25 c, unless otherwise noted.) op90a/e op90g parameter symbol conditions min typ max min typ max unit input offset voltage v os 50 150 125 450 v input offset current i os v cm = 0 v 0.4 3 0.4 5 na input bias current i b v cm = 0 v 4.0 15 4.0 25 na large-signal v s = 15 v, v o = 10 v voltage gain a vo r l = 100 k 700 1200 400 800 v/mv a vo r l = 10 k 350 600 200 400 v/mv a vo r l = 2 k 125 250 100 200 v/mv v+ = 5 v, ve = 0 v, 1 v < v o < 4 v a vo r l = 100 k 200 400 100 250 v/mv a vo r l = 10 k 100 180 70 140 v/mv input voltage range 1 ivr v+ = 5 v, ve = 0 v 0/4 0/4 v v s = 15 v e15/13.5 e15/13.5 v output voltage swing v o v s = 15 v r l = 10 k 14 14.2 14 14.2 v r l = 2 k 11 12 11 12 v v oh v+ = 5 v, ve = 0 v r l = 2 k 4.0 4.2 4.0 4.2 v v ol v+ = 5 v, ve = 0 v r l = 10 k 100 500 100 500 v common-mode cmr v+ = 5 v, ve = 0 v, rejection 0 v < v cm < 4 v 90 110 80 100 db cmr v s = 15 v, e15 v < v cm < 13.5 v 100 130 90 120 db power supply rejection ratio psrr 1.0 5.6 3.2 10 v/v slew rate sr v s = 15 v 5 12 5 12 v/ms supply current i sy v s = 1.5 v 9 15 9 15 a i sy v s = 15 v 14 20 14 20 a capacitive load a v = 1 stability 2 no oscillations 250 650 250 650 pf input noise voltage e n p-p f o = 0.1 hz to 10 hz v s = 15 v 3 3 v p-p input resistance differential mode r in v s = 15 v 30 30 m input resistance common-mode r incm v s = 15 v 20 20 g notes 1 guaranteed by cmr test. 2 guaranteed but not 100% tested. specifications subject to change without notice. electrical characteristics especifications
rev. b ?3? op90 (v s = 1.5 v to 15 v, e55 c
rev. b ?4? op90 op9oe op9og parameter symbol conditions min typ max min typ max unit input offset voltage v os 70 270 180 675 v average input offset voltage drift tcv os 0.3 2 1.2 5 v/ c input offset current i os vcm = 0 v 0.8 3 1.3 7 na input bias current i b vcm = 0 v 4.0 15 4.0 25 na large-signal a vo v s = 15 v, v o = 10 v voltage gain r l = 100 k 500 800 300 600 v/mv r l = 10 k 250 400 150 250 v/mv r l = 2 k 100 200 75 125 v/mv a vo v+ = 5 v, ve = 0 v, 1 v < v o < 4 v r l = 100 k 150 280 80 160 v/mv r l = 10 k 75 140 40 90 v/mv input voltage range * ivr v+ = 5 v, ve = 0 v 0/3.5 0/3.5 v v s = 15 v e15/13.5 e15/13.5 v output voltage swing v o v s = 15 v r l = 10 k 13.5 14 13.5 14 v r l = 2 k 10.5 11.8 10.5 11.8 v v oh v+ = 5 v, ve = 0 v r l = 2 k 3.9 4.1 3.9 4.1 v v ol v+ = 5 v, ve = 0 v r l = 10 k 100 500 100 500 v common-mode cmr v+ = 5 v, ve = 0 v, rejection 0 v < v cm < 3.5 v 80 100 80 100 db v s = 15 v, e15 v < v cm < 13.5 v 100 120 90 110 db power supply rejection ratio psrr 10 5.6 5.6 17.8 v/v supply current i sy v s = 1.5 v 13 25 12 25 a v s = 15 v 17 30 16 30 a note * guaranteed by cmr test. electrical characteristics (v s = 1.5 v to 15 v, e25 c
rev. b op90 ?5? ordering guide package options t a = 25 c operating v os max cerdip plastic temperature (mv) 8-lead 8-lead range 150 op90az/883 * mil 150 op90ez * ind 450 op90gp xind 450 op90gs xind * not for new design, obsolete april 2002. absolute maximum ratings 1 supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 v differential input voltage . . . . [(ve) e 20 v] to [(v+) + 20 v] common-mode input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [(ve) e 20 v] to [(v+) + 20 v] output short-circuit duration . . . . . . . . . . . . . . . . indefinite storage temperature range z package . . . . . . . . . . . . . . . . . . . . . . . . . e65 c to +150 c p package . . . . . . . . . . . . . . . . . . . . . . . . . e65 c to +150 c operating temperature range op90a . . . . . . . . . . . . . . . . . . . . . . . . . . . e55 c to +125 c op90e . . . . . . . . . . . . . . . . . . . . . . . . . . . . e25 c to +85 c op90g . . . . . . . . . . . . . . . . . . . . . . . . . . . . e40 c to +85 c junction temperature (t j ) . . . . . . . . . . . . . e65 c to +150 c lead temperature (soldering 60 sec) . . . . . . . . . . . . . . 300 c caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although the op90 features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality. warning! esd sensitive device package type
rev. b op90 ?6? temperature e c input offset voltage e v 100 80 0 e75 e50 125 025 100 40 60 20 75 50 e25 v s = 15v tpc 1. input offset voltage vs. temperature temperature e c supply current e a 22 18 2 e75 e50 125 025 100 10 14 6 75 50 e25 no load v s = 1.5v 20 16 8 12 4 v s = 15v tpc 4. supply current vs. temperature frequency e hz closed-loop gain e db 60 40 e20 10 100k 1k 20 0 10k 100 v s = 15v t a = 25 c tpc 7. closed-loop gain vs. frequency et ypical performance characteristics temperature e c input offset current e na 1.6 0.2 e75 e50 125 025 100 0.8 1.0 0.4 75 50 e25 1.4 1.2 0.6 v s = 15v tpc 2. input offset current vs. temperature single-supply voltage e v open-loop gain e v/mv 600 0 030 10 15 25 300 100 20 5 500 400 200 r l = 10k t a = 25 c t a = 85 c t a = 125 c tpc 5. open-loop gain vs. single-supply voltage load resistance e output voltage swing e v 6 4 0 100 100k 1k 3 1 10k v+ = 5v, ve = 0v t a = 25 c 5 2 tpc 8. output voltage swing vs. load resistance temperature e c input bias current e na 4.2 4.0 3.0 e75 e50 125 025 100 3.6 3.8 3.4 75 50 e25 v s = 15v 3.2 tpc 3. input bias current vs. temperature frequency e hz open-loop gain e db 140 120 0 0.1 1 100k 10 100 10k 80 100 60 1k v s = 15v t a = 25 c r l = 100k 40 20 gain 45 0 90 135 180 phase shift e deg tpc 6. open-loop gain and phase shift vs. frequency load resistance e output swing e v 16 12 0 100 100k 1k 8 4 10k t a = 25 c v s = 15v 14 6 10 2 positive negative tpc 9. output voltage swing vs. load resistance
rev. b ?7? op90 +18v e18v 2 3 4 6 7 op90 figure 2. burn-in circuit application information battery-powered applications the op90 can be operated on a minimum supply voltage of 1.6 v, or with dual supplies 0.8 v, and draws only 14 pa of supply current. in many battery-powered circuits, the op90 can be continuously operated for thousands of hours before requiring battery replacement, reducing equipment down time and operating cost. high-performance portable equipment and instruments fre quently use lithium cells because of their long shelf-life, light weight, and high-energy density relative to older primary cells. most lithium cells have a nominal output voltage of 3 v and are noted for a flat discharge characteristic. the low-supply voltage requirement of the op90, combined with the flat discharge characteristic of the lithium cell, indicates that the op90 can be operated over the entire useful life of the cell. figure 1 shows the typical dis- charge characteristic of a 1ah lithium cell powering an op90 which, in turn, is driving full output swing into a 100 k load. frequency e hz power supply rejection e db 120 100 20 11k 10 100 t a = 25 c 60 80 40 positive supply negative supply tpc 10. power supply rejection vs. frequency frequency e hz current noise density e pa/ hz hz hz hz
rev. b op90 ?8? single-supply output voltage range in single-supply operation, the op90?s input and output ranges include ground. this allows true zero-in, zero-out operation. the output stage provides an active pull-down to around 0.8 v above ground. below this level, a load resistance of up to 1 m to ground is required to pull the output down to zero. in the region from ground to 0.8 v, the op90 has voltage gain equal to the data sheet specification. output current source capatibility is maintained over the entire voltage range includ- in g ground. applications battery-powered voltage reference the circuit of figure 6 is a battery-powered voltage reference that draws only 17 a of supply current. at this level, two aa cells can power this reference over 18 months. at an output voltage of 1.23 v @ 25 c, drift of the reference is only at 5.5 v/ c over the industrial temperature range. load regulation is 85 v/ma with line regulation at 120 v/v. design of the reference is based on the bandgap technique. scaling of resistors r1 and r2 produces unequal currents in q1 and q2. the resulting v be mismatch creates a temperature proportional voltage across r3 which, in turn, produces a larger temperature-proportional voltage across r4 and r5. this volt- age appears at the output added to the v be of q1, which has an opposite temperature coefficient. adjusting the output to l.23 v at 25 c produces minimum drift over temperature. bandgap references can have start-up problems. with no current in r1 and r2, the op90 is beyond its positive input range limit and has an undefined output state. shorting pin 5 (an offset adjust pin) to ground, forces the output high under these conditions and ensures reliable start-up without significantly degrading the op90?s offset drift. 4 2 3 5 6 7 op90 r1 240k r2 1.5m c1 1000pf v+ (2.5v to 36v) v out (1.23v @ 25 c) 6 5 7 3 2 1 r3 68k r4 130k r5 20k output adjust mat-01ah figure 6. battery-powered voltage reference hours lithium sulphur dioxide cell voltage e v 4 3 0 0 2000 7000 4000 2 1 1000 3000 6000 5000 figure 3. lithium sulphur dioxide cell discharge characteristic with op90 and 100 k load input voltage protection the op90 uses a pnp input stage with protection resistors in series with the inverting and noninverting inputs. the high breakdown of the pnp transistors coupled with the protection resistors provides a large amount of input protection, allowing the inputs to be taken 20 v beyond either supply without dam- aging the amplifier. offset nulling the offset null circuit of figure 4 provides 6 mv of offset ad just- ment range. a 100 k resistor placed in a series with the wiper of the offset null potentiometer, as shown in figure 5, reduces the offset adjustment range to 400 v and is recommended for ap plica tions requiring high null resolution. offset nulling does not affect tcv os performance. test circuits v+ 1 2 3 5 6 7 op90 4 100k ve figure 4. offset nulling circuit v+ 1 2 3 5 6 7 op90 4 100k ve 100k figure 5. high resolution offset nulling circuit
rev. b op90 ?9? single op amp full-wave rectifier figure 7 shows a full-wave rectifier circuit that provides the absolute value of input signals up to 2.5 v even though operated from a single 5 v supply. for negative inputs, the amplifier acts as a unity-gain inverter. positive signals force the op amp output to ground. the 1n914 diode becomes reversed-biased and the signal passes through r1 and r2 to the output. since output impedance is dependent on input polarity, load impedances cause an asymmetric output. for constant load im pedances, this can be corrected by reducing r2. varying or heavy loads can be buffered by a second op90. figure 8 shows the output of the full-wave rectifier with a 4 v p-p , 10 hz input signal. +5v 2 3 4 6 op90fz 7 r3 100k hp5082-2800 v in r1 10k r2 10k 1n914 v out figure 7. single op amp full-wave rectifier figure 8. output of full-wave rectifier with 4 v p-p , 10 hz input 2-wire 4 ma to 20 ma current transmitter the current transmitter of figure 9 provides an output of 4 ma to 20 ma that is linearly proportional to the input voltage. linearity of the transmitter exceeds 0.004% and line rejection is 0.0005%/volt. biasing for the current transmitter is provided by the ref-02ez. the op90ez regulates the output current to satisfy the current summation at the noninverting node: i r vr r vr r out in =+ 1 6 5 2 55 1 for the values shown in figure 9, ivma out in = + 16 100 4 giving a full-scale output of 20 ma with a 100 mv input. adjustment of r2 w ill provide an offset trim and adjustment of r1 will provide a gain trim. these trims do not interact since the noninverting input of the op90 is at virtual ground. the schottky d iode, d1, prevents input voltage spikes from pulling the noninverting input more than 300 mv below the inverting input. without the diode, such spikes could cause phase reversal of the op90 and possible latch-up of the transmitter. com pliance of this circuit is from 10 v to 40 v. the voltage reference output can provide up to 2 ma for transducer excitation. 2 3 4 6 7 i out = 16v in 100 + 4ma v in r2 5k 6 4 2 r6 100 r3 4.7k r4 100k r1 1m d1 hp 5082- 2800 r5 80k +5v reference 2ma max e + i out r l 2n1711 v+ (10v to 40v) op90ez ref-02ez figure 9. 2-wire 4 ma to 20ma transmitter
rev. b op90 ?10? micropower voltage-controlled oscillator two op90s in combination with an inexpensive quad cmos switch comprise the precision vco of figure 10. this circuit provides triangle and square wave outputs and draws only 50 a from a single 5 v supply. a1 acts as an integrator; s1 switches the charging current symmetrically to yield positive and negative ramps. the integrator is bounded by a2 which acts as a schmitt trigger with a precise hysteresis of 1.67 v, set by resistors r5, r6, and r7, and associated cmos switches. the resulting output of a1 is a triangular wave with upper and lower levels of 3.33 v and 1.67 v. the output of a2 is a square wave with almost rail-to-rail swing. with the components shown, frequency of operation is given by the equation: fv v hzv out control = () 10 / but this is easily changed by varying c1. the circuit operates well up to a few hundred hertz. micropower single-supply instrumentation amplifier the simple instrumentation amplifier of figure 11 provides over 110 db of common-mode rejection and draws only 15 a of supply current. feedback is to the trim pins rather than to the inverting input. this enables a single amplifier to provide differ- ential to single-ended conversion with excellent common-mode rejection. distortion of the instrumentation amplifier is that of a differential pair, so the circuit is restricted to high gain applica- 3 7 c1 75nf 6 4 2 r3 100k r4 200k r1 200k r2 200k v control +5v triangle out r8 200k +5v r5 200k 3 7 6 4 2 square out r6 200k r7 200k in/out out/in in/out cont cont cont 1 in/out in/out v ss +5v cont 2 3 4 5 6 7 14 13 12 11 10 9 8 cd4066 +5v +5v +5v v dd out/in out/in out/in op90ez a2 s1 s2 s3 s4 op90ez a1 figure 10. micropower voltage controlled oscillator tions. nonlinearity is less than 0.1% for gains of 500 to 1000 over a 2.5 v output range. resistors r3 and r4 set the voltage gain and, with the values shown, yield a gain of 1000. gain tempco of the instrumentation amplifier is only 50 ppm/ c. offset voltage is under 150 v with drift below 2 v/ c. the op90?s input and output voltage ranges include the negative rail which allows the instrumentation amplifier to provide true zero-in, zero-out operation. r1 4.3m r4 3.9m r3 1m r2 500k gain adjust v out 3 7 6 4 2 5 ein 1 +in 0.1 f +5v op90ez figure 11. micropower single-supply instrumentation amplifier
rev. b op90 ?11? single-supply current monitor current monitoring essentially consists of amplifying the voltage drop across a resistor placed in a series with the current to be measured. the difficulty is that only small voltage drops can be tolerated and with low precision op amps this greatly limits the overall resolution. the single supply current monitor of figure 12 has a resolution of 10 a and is capable of monitoring 30 ma of current. this range can be adjusted by changing the current sense resistor r1. when measuring total system current, it may be necessary to include the supply current of the current moni- tor, which bypasses the current sense resistor, in the final result. this current can be measured and calibrated (together with the residual offset) by adjustment of the offset trim potentiometer, r2. this produces a deliberate offset that is temperature dependent. however, the supply current of the op90 is also proportional to tem perature and the two effects tend to track. current in r4 and r5, which also bypasses r1, can be accounted for by a gain trim. r1 1 r4 9.9k r2 100k r3 100k 3 7 6 4 2 5 1 v+ r5 100 i test v out = 100mv/ma (i test ) to circuit under test e + op90ez figure 12. single-supply current monitor
?12? c00321?0?5/02(b) printed in u.s.a. outline dimensions dimensions shown in inches and (mm). revision history location page data sheet changed from rev. a to rev. b. edits to 8-lead soic package (r-8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9/01?data sheet changed from rev. 0 to rev. a. edits to pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 edits to electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 3, 4 edits to ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 edits to absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 edits to package type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 deleted op90 dice characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 deleted wafer test limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8-lead soic package (r-8) 0.25 (0.0098) 0.19 (0.0075) 1.27 (0.0500) 0.41 (0.0160) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 85 4 1 5.00 (0.1968) 4.80 (0.1890) pin 1 0.1574 (4.00) 0.1497 (3.80) 1.27 (0.0500) bsc 6.20 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.33 (0.0130) coplanarity controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design compliant to jedec standards ms-012 aa 8-lead pdip package (n-8) seating plane 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) max 0.022 (0.558) 0.014 (0.356) 0.160 (4.06) 0.115 (2.93) 0.070 (1.77) 0.045 (1.15) 0.130 (3.30) min 8 14 5 pin 1 0.280 (7.11) 0.240 (6.10) 0.100 (2.54) bsc 0.430 (10.92) 0.348 (8.84) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) 0.325 (8.25) 0.300 (7.62) 8-lead hermetic package (q-8) 1 4 85 0.310 (7.87) 0.220 (5.59) pin 1 0.005 (0.13) min 0.055 (1.4) max 0.100 (2.54) bsc 15? 0? 0.320 (8.13) 0.290 (7.37) 0.015 (0.38) 0.008 (0.20) seating plane 0.200 (5.08) max 0.405 (10.29) max 0.150 (3.81) min 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.070 (1.78) 0.030 (0.76) 0.060 (1.52) 0.015 (0.38)

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