ANALOG DEVICES Next Generation OP07, Ultralow Offset Voltage Operational Amplifier OP77 FEATURES * Outstanding Gain Linearity Ultra High Gain ...csssee een 5000V/mV Min * Low Vos Over Temperature ....ssscssecscsesnssrssescees 60uV Max Excellent TOV 9g. sesscsscssssssssssmenenessesneoeeanees 0.3u.V/C Max High PSRR 3u.V/V Max * Low Power Consumption ........cccseceserseeeees 60mW Max Fits OP-07, 725, 108A/308A, 741 Sockets * Available in Die Form ORDERING INFORMATION ' PACKAGE OPERATING CERDIP PLASTIC Lec TEMPERATURE TO-99 8-PIN 8-PIN 20-PIN RANGE OP77AJ" OP77Az" - - MIL OP77EJ OP77EZ - - IND - - OP77EP - COM OP77BJ* OP77B2* - OP77BRC/883 MIL OP77FJ OP77FZ - - IND - - OP77FP - COM - - OP77GP - COM - - op77Gs" - COM - - OP77HP - XIND - - OP77HStt - XIND For devices processed in total compliance to MIL-SDT-883, add /883 after part number. Consult factory for 883 data sheet. t Burn-in is available on commercial and industrial temperature range parts In CerDIP, plastic DIP, and TO-can packages. tt For availability and burn-in information on SO and PLCC packages, contact your local sales office. superior performance in high closed-loop-gain applications. Low initial V,,, drift and rapid stabilization time, combined with only 50mW power consumption, are significant improvements over previous designs. These characteristics, plus the excep- tional TCV, . of 0.3nV/C maximum and the low V,. of 25uV maximum, eliminates the need for V,, adjustment and in- creases system accuracy over temperature. PSRR of 3uV/V (110dB) and CMRR of 1.0uV/V maximum virtu- ally eliminiate errors caused by power supply drifts and com- mon-mode signals. This combination of outstanding character- istics makes the OP-77 ideally suited for high-resolution instru- mentation and other tight error budget systems. Continued PIN CONNECTIONS Vog TRIM chen, Vog TRIM IN{2 | [7 | Vv+ 8 Vos TRIM +N atv 18 jout Vos TRIM 4 7+ v-[4] 5 | NAC. -IN2 6 OUT EPOXY MINI-DIP (P-Sufflx) 8-PIN HERMETIC DIP aN 3 BNC. (Z-Suffix) 3 V~ (CASE) 8-PIN SO TO-99 (J-Suffix) (S-Suffix) GENERAL DESCRIPTION OP 77BRC/E83 The OP-77 significantly advances the state-of-the-art in preci- (RC-Suffix) sion op amps. The OP-77's outstanding gain of 10,000,000 or more is maintained over the full +10V output range. This excep- tional gain-linearity eliminates incorrectable system nonlineari- ties common in previous monolithic op amps, and provides SIMPLIFIED SCHEMATIC V+ 7 2R7 *NOTE: 4 R24 AND R28 ARE ELECTRONICALLY q aig ADJUSTED ON CHIP AT FACTORY. R9 OUTPUT O6 NON- 017 R10 INVERTING ate INPUT Q20 2 R4 O15 [AVERTING oWM, ate 4 R6 R8 V- OP77 This product is available in six standard grades and five stan- dard packages: the TO-99 can, the 8-pin mini-DIP in ceramic, SO or epoxy, and the 20-contact LCC. The OP-77 is a direct or upgrade replacement forthe OP-07, 05, . 725, or 108A op amps. 741-types can be replaced by eliminat- ing the V,,, adjust pot. For higher precision performance refer to OP-177. ABSOLUTE MAXIMUM RATINGS (Note 2) Supply Voltage Differential input Voltage Input Voltage (Note 1) Output Short-Circuit Duration Storage Temperature Range J, Z, and RC Packages ........seseenscesecsenees -65C to +150C P PACKAGE .....cscscecscccssssessscceressserecsteceeesenses 65C to +125C Operating Temperature Range OP-77A, OP-77B (J, Z, RC) .....ccccsssesseeeveeee -55C to +125C OP-77E, OPP-77F (J, Z) .ssssccccssssrvensererssseee 25C to +85C OP-77E, OP-77F, OP-77G (P, S) .....--cccesceseecceeeee 0C to 70 OP-77H (P, S) ...csssccsesscecsecscseseneesenesseeeensenees 40C to +85C Junction Temperature (T,) .......cccssssecccetssseee 65C to +1506 Lead Temperature (Soldering, 6O S@C.) .........:sssesecee +300C PACKAGE TYPE 8, (Note 3) QW UNITS TO-99 (J) 150 18 CW 8-Pin Hermetic DIP (Z) 148 16 C/W 8-Pin Plastic DIP (P) 103 43 sCwW 20-Contact LCC (RC, TC) 98 38 CiW 8-Pin SO(S) 158 43 CW NOTES: 1. For supply voltages less than +22V, the absolute maximum input voltage is equal to the supply voltage. 2. Absolute maximum ratings apply to both DICE and packaged parts, unless otherwise noted. @,, is specified for worst case mounting conditions, i.e., @,, is specified for device in socket for TO, CerDIP, P-DIP, and LCC packages; iF ,'8 specified for device soldered to printed circuit board for SO package. 3. ELECTRICAL CHARACTERISTICS at V, =+15V, T, = +25C, unless otherwise noted. . OP-77A OP-77B PARAMETER SYMBOL CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Input Offset Voltage Vo 8 - 10 25 - 20 60 uv Long-Term Input Offset : Voltage Stability AVo,/Time (Note 1) - 0.2 - - 0.2 - pV/Mo input Offset Current los - 0.3 15 - 0.3 28 nA Input Bias Current le 0.2 1.2 2.0 0.2 1.2 28 nA Input Noise Voltage enp.p 0.1Hz to 10Hz (Note 2) - 0.35 0.6 - 0.35 0.6 pVp-p fo = 10Hz (Note 2) - 10.3 18.0 ~- 10.3 18.0 Input Noise Voltage Density e, fo = 100Hz (Note 2) ~ 10.0 13.0 - 10.0 13.0 Wi Hz fg = 1000Hz (Note 2) - 9.6 11.0 - 96 11.0 input Noise Current hp p 0.1Hz to 10Hz (Note 2) - 14 30 - 14 30 pAp-p fo = 10Hz (Note 2) - 032 0.80 - 0.32 0.80 Input Noise Current Density i, fy = 100Hz (Note 2) - 0.14 0.23 - 0.14 0.23 pA//Hz fo = 1000Hz (Note 2) - 012 0.17 - 0.12 0.17 Input Resistance Differential-Mod Rix (Note 3) 26 45 - 18.5 45 - MQ Input Resistance Common-Mode Pincm - 200 - - 200 - Ga Input Voltage Range IVA +13 +14 - +13 +14 - Vv Common-Mode Rejection Ratio CMRR Vom ti3V - 0.1 1.0 - 0.1 1.0 pviv Power Supply Rejection Ratio PSRR V, =23V to 18V - 0.7 - 0.7 pV Large-Signa! Voltage Gain Avo R, 22ka, VO =+10V 5000 12000 - 2000 8000 - VimV R, = 10kQ 419.5 414.0 - 413.5 14.0 - Output Voltage Swing Vo R, 22kQ 125 13.0 - #125 413.0 - V R, 21kQ 2120 412.5 - 4120 12.5 - Slew Rate SR. R, 22kn (Note 2) 0.1 0.3 - 0.41 0.3 - Vips Closed-Loop Bandwidth BW Ayo. = +1 (Note 2). 0.4 0.6 - 04 0.6 - MHz Open-Loop Output Resistance Ro - 60 - - 60 - a . V,. =:15V, No Load - 50 60 - 50 60 s , Power Consumption Ps V, = #3V, No Load - 35 45 - 35 45 mW Offset Adjustment Range Ry = 20kQ - +3 - - +3 - mV NOTES: 1, Long-Term Input Offset Voltage Stability refers to the averaged trend line of Vog S Time over extended periods after the first30 days of operation. Excluding the initial hour of operation, changes in V,, , during the first 30 oper- ating days are typically 2.5pV. 2. Sample tested. 3. Guaranteed by design.OP77 ELECTRICAL CHARACTERISTICS at Vs = + 15V, -55C < Ta = + 125C, unless otherwise noted. OP-77A OP-77B PARAMETER SYMBOL CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Input Offset Voltage Vos - 25 60 _ 45- 120 BV Average Input Offset 5g - 0.1 0.3 _ 2 . Vie Voltage Dritt TCVgg (Note 1) 0 0.6 W/o Input Offset Current log _ 0.5 2.2 _ 0.5 4.6 nA t nen input Offset Current TClog (Note 2) 18 285 15 60 parc Input Bias Current Ig -0.2 2.4 4 ~0.2 2.4 6 nA Average Input Bias Current TCls (Note 2) _ 8 25 _ 45 35 pAeC Drift Input Voltage Range IVR +13 413.5 _ +13 413.5 Vv Common-Mods Rejection Ratio CMRR Vom = 13V _ 0.1 1.0 - 0.1 3 BV/V Power Supply Rejection Ratio PSRR Vg = +3V to +18V _ 1 3 - 1 5 BIN Large-Signa! Voltage Gain Avo R, 2 2kQ, Vg = 10V 2000 6000 - 1000 = 4000 _- vimv Output Voltage Swing Vo R, 2 2kn 412 413.0 _- +120 413.0 _ v Power Consumption Py Vg = +15V, No Load _ 60 75 _ 60 75 mw NOTES: 1. OP-77A: TCVog is 100% tested. 2. Guaranteed by end-point limits. TYPICAL OFFSET VOLTAGE TEST CIRCUIT TYPICAL LOW-FREQUENCY NOISE TEST CIRCUIT > 200k VVV 50: wy 3.3k2. Teen OP-77 ' vo Vv 4.7uF Vos a5 I =" (8 10Hz FILTER) = INPUT REFERRED NOISE = 3205 OPTIONAL OFFSET NULLING CIRCUIT BURN-IN CIRCUIT 100k WA +18VOP77 ELECTRICAL CHARACTERISTICS at Vs = +15V, Ta = 25C, unless otherwise noted. OP-77E OP-77F OP-77G/H PARAMETER SYMBOL CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS Input Offset Voltage Vos - 10 25 _ 20 60 _ 50 100 uv Long-Term Vog . Vv _ . 0.4 _ A _ Stability os/Time (Note 1) 0.3 0. uV/Mo Input Offset Current log 0.3 1.5 _ 0.3 2.8 _ 0.3 28 nA Input Bias Current Ip ~0.2 1.2 2.0 -0.2 1.2 28 -0.2 1.2 28 nA 0.1Hz to 10Hz j _ 0.35 0.6 _ 0.38 0.65 _ 0.38 0.65 Vv Input Noise Voltage = Enp.p (Note 2) BV p-p Input Noise lo= 10Hz 8 18.0 105 20.0 105 20.0 Nota e Densit en fo = 100Hz (Note 2) 10.0 13.0 _ 10.2 13.5 _ 10.2 13.5 nV//Hz 9 {= 1000Hz 96 110 98 15 - 98 115 : 0.1Hz to 10Hz input Noise Current inp-p (Note 2) _ 14 30 _ 15 35 _ 15 35 PAp-p Input Noise fo = 10Hz _ 0.32 0.80 _ 0.35 0.90 _ 0.35 0.90 Current Densit in fo = 100Hz (Note 2) _ 0.14 0.23 _ 0.15 0.27 _ 0.15 0.27 pA//Hz y fo = 1000Hz _ 0.12 0.17 _ 0.13 0.18 _ 013 0.18 input Resistance (Note 3) 26245 _ 185 45 _ 185 45 _ Ma Differential-Mode IN . Input Resistance R _ 20 _ _ 200 _ _ 2 Common-Mode INCM 00 Gn Input Voltage Range IVR +13 +14 _ #13 +14 _ #13 +14 _ Vv Common-Mode =t _ 0.1 1.0 _ 0.1 16 _ 0.4 1.6 V/V Rejection Ratio CMRR Vom = =18V wv! Power Supply oer . PSRR Vg =+3V to +18V _ 0.7 3.0 _ 0.7 3.0 0.7 3.0 uV/V Rejection Ratio Large-Signai R, = 2k, A 5000 12000 _ 2000 6000 _ 2000 6000 _ V/mv Voltage Gain vO Vo =+10V Output Voltage R, = 10k9. +13.5 +140 _ +13.5 +140 _ 413.56 +14.0 _ Sue g Vo R, 2 2ka #125 +130 #125 +130 #126 130 V g R, = tka 412.0 +12.5 _ 412.0 +125 _ 12.00 +12.5 _ Siew Rate SR R, & 2k (Note 2) 01 0.3 _ 01 0.3 _ 0.4 0.3 _ V/us Closed-Loop AvcL = +1 B 0.4 . _ 0.4 0.6 _ 0.4 0.6 MH; Bandwidth Ww (Note 2) 0.6 2 Open-Loop Output Ro _ 60 _ _ 60 _ _ 60 a 0 Resistance . Vg = +15V, No Load _ 50 60 _ 50 60 _ 50 60 Ww Power Consumption Pa Vg = +3V, No Load 35 45 35 45 35 45 Offset Adjustment Rp = 20k _ +3 _ _ +3 _ _ 43 _ mv Range NOTES: 1. Long-Term input Offset Voitage Stability refers to the averaged trend line of Vog vs. Time over extended periods after the first 30 days of operation. Excluding the initial hour of operation, changes in Vog during the first 30 operating days are typically 2.5uV. 2. Sample tested. 3. Guaranteed by design.OP77 ELECTRICAL CHARACTERISTICS at Vg = +1 SV, -25C = T, s +85C for OP-77E/FJ and OP-77E/FZ,0C sT, s +70C for OP-77E/F/GP/GS, 40C < TA <= +85C for OP-77HP/HS, unless otherwise noted. OP-77E OP-77F OP-77G/H PARAMETER SYMBOL CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS J, Z Packages ~ 10 45 - 20 100 - - - v Input Offset Voltage = Vog P Package - 10 55 - 20 100 - 80 150 4 Average Input Offset J, Z Packages - 0.1 0.3 - 0.2 0.6 - ~ - 0 Voltage Drift TVEg5 PPackage Note) 0.3 0.6 - 04 10 - 07 642 BvPS Input Offset Current los - 0.5 2.2 = 0.5 45 - 0.5 45 nA Average Input Offset Current Drift TClog (Note 2) - 15 40 1.5 85 1.5 85 pAPC Input Bias Current | E, F, G Grades 02 24 4.0 0.2 2.4 6.0 ~0.2 2.4 6.0 nA A B H Grade - = - _ - - - 24 +6.0 Average Input Bias o Current Drift TCl, (Note 2) - 8 40 - 15 60 - 15 60 pArC Input Voltage Range IVR 213.0 213.5 - #13.0 135 - 13.0 13.5 - Vv Common-Mode Rejection Ratio CMRR Vom = #18V ~ Of 1.0 ~ 0.1 3.0 - 0.1 3.0 pV/V Power Supply _ _ _ Rejection Ratio PSRR Vg = #3V to 18V - 1.0 3.0 1.0 5.0 1.0 5.0 uviV Large-Signal R, = 2kQ _ - - Vv Voltage Gain Avo Ve = #10V 2000 6000 1000 4000 1000 4000 mv Output Voltage Vo R, = 2k #12 213.0 - 212 213.0 - #12 13.0 ~ v Swing Power Consumption Ps Vg =+15V, No Load - 60 75 - 60 75 - 60 75 mw NOTES: 1. OP-77E: TCV, is 100% tested on J and Z packages. 2. Guaranteed by end-point limits. OPEN-LOOP GAIN LINEARITY Vy TYPICAL h YY OP-77 PRECISION OP AMP vy Vin = t10V ~ Vy _ >. 108 [ =10V_ [OV RT T-10v ov T+t0v Vx ct F = = = Avo = 650V/mV - 7 OF f - Ry = 2k NOTES: 1. GAIN NOT CONSTANT CAUSES NONLINEAR ERRORS. 2. Avo SPEC IS ONLY PART OF THE SOLUTION. A o 40,000V/mV 3. CHECK YOUR OP AMP PERFORMANCE, ESPECIALLY AT TEMPERATURES. Aye 2k Actual open-loop voltage gain can vary greatly at various output This is the output gain linearity trace for the new OP-77. The voltages. All automated testers use end-point testing and there- output trace is virtually horizontal at all points, assuring ex- fore only show the average gain. This causes errors in high tremely high gain accuracy. The average open-loop gain is truly closed-loop gain circuits. Since this is so difficult for manufac- impressive approximately 10,000,000. turers to test, you should make your own evaluation. This simple test circuit makes it easy. An ideal op amp would show a hori- zontal scope trace.OP77 DICE CHARACTERISTICS Tee.) je tf am 1. BALANCE 2. INVERTING INPUT 3. NONINVERTING INPUT 4. V- 6. OUTPUT 7% V+ 8. BALANCE DIE SIZE 0.093 x 0.057 inch, 5301 sq. mils (2.36 X 1.45 mm, 3.42 sq. mm) WAFER TEST LIMITS at Vg = +15V, Ta = 25C for OP-77N/G devices. OP-77N OP-77G PARAMETER SYMBOL CONDITIONS LIMIT LIMIT UNITS Input Offset Voltage Vos 40 75 uV MAX Input Offset Current los 2.0 2.8 nA MAX Input Bias Current lp t2 +2.8 nA MAX Input Resistance Differential-Mode Pin (Note 1) 26 Ma MIN Input Voltage Range IVR +13 13 V MIN Common-Mode =t Rejection Ratio CMRR Vom = =13V 1 1.6 uV/V MAX Power Supply + =+3V to 18V 3 Rejection Ratio PSRR Vg = 38V to 18 3 pV/V MAX R, = 10k 413.5 13.65 Output Voltage Swing Vo R, =2kn 412.5 125 V MIN R,_=1ka +12.0 12.0 Large-Signal RL = 2ka > Voltage Gain Avo Vo = #10V 2000 1000 V/mV MIN Differential Input +30 +30 V MAX Voltage Power Consumption Pg Vout = OV 60 60 mW MAX NOTES: 1. Guaranteed by design. Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed for standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing. TYPICAL ELECTRICAL CHARACTERISTICS at Vg = t15V, Ta = +25C, unless otherwise noted. OP-77N OP-77G PARAMETER SYMBOL CONDITIONS TYPICAL TYPICAL UNITS Average Input Offset = 1 : Voltage Drift TCVos Rg =500 0 0.2 wV/C Nulled input Offset _ = Voltage Drift TCVosn Rg = 500, Rp = 20kN 0.1 0.2 uVv/C Average Input Offset 0.5 0.5 Current Drift TClos pane Slew Rate SR R, 22kn 0.3 0.3 V/ps Closed-Loop _ Bandwidth BW Avo. = +1 0.6 0.6 MHzOP77 TYPICAL PERFORMANCE CHARACTERISTICS GAIN LINEARITY (INPUT VOLTAGE vs OUTPUT VOLTAGE) Vg = #15V Ta = 425C Ry = 10k2 (INPUT VOLTAGE (uz) [NULLED TO OnV @ Voy = OV) oO =10 5 0 5 10 OUTPUT VOLTAGE (VOLTS) UNTRIMMED OFFSET VOLTAGE vs TEMPERATURE 30 Toy J, Z PACKAGES ,, +0.3nV/ C >| 20 CHANGE IN OFFSET VOLTAGE (xV} ne cr N N -30 55 -35 -15 5 25 45 65 TEMPERATURE (C} 85 105 125 CLOSED-LOOP RESPONSE FOR VARIOUS GAIN CONFIGURATIONS 100 t Vg = #15V Ta = 425C 2 3 Q \ i o AN ~ ny So CLOSED-LOOP GAIN (dB) \ ~ \ 10 100 1k 10k 100k IM 10M FREQUENCY (Hz) OPEN-LOOP GAIN (V/uV) CHANGE IN INPUT OFFSET VOLTAGE(zV) OPEN-LOOP GAIN (dB} OPEN-LOOP GAIN vs TEMPERATURE 25 T_T Vg= #15V 20 | L | 15 ra 10 a 5 0 55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (C) WARM-UP DRIFT Vg = 18 Ta = 425C oO 0.5 1 5 2 2.5 3 3.5 TIME AFTER POWER SUPPLY TURN-ON (MINUTES) OPEN-LOOP GAIN/PHASE RESPONSE Vg = T15V Ty = 428C 0 0.01 0.1 1 10 100 1k FREQUENCY (Hz) 4s o o e an 180 10k 100k 1M PHASE SHIFT (DEGREES) OPEN-LOOP GAIN vs POWER SUPPLY VOLTAGE Ta = 425C Ry = 2kQ OPEN-LOOP GAIN (V/nV} 0 +5 +10 415 +20 POWER SUPPLY VOLTAGE (VOLTS) OFFSET VOLTAGE CHANGE DUE TO THERMAL SHOCK Vg 2 15V DEVICE IMMERSED IN 70C OIL BATH (20 UNITS) ABSOLUTE CHANGE IN INPUT OFFSET VOLTAGE (uV} 0 70 20 30 40 50 60 70 TIME (SEC) CMRR vs FREQUENCY Ta= CMRR (dB) 100 1k 10k FREQUENCY (Hz) 100kOP77 TYPICAL PERFORMANCE CHARACTERISTICS RMS NOISE (V) PSRR (dB} POWER CONSUMPTION (mW) 0.1 100 1 100 1k 0 PSRR vs FREQUENCY Taat 1.0 10 100 1k FREQUENCY (Hz) 10k INPUT WIDEBAND NOISE vs BANDWIDTH (0.1Hz TO FREQUENCY INDICATED) Vg = 15V Ty = +25C 70k BANDWIDTH (Hz) 100k POWER CONSUMPTION vs POWER SUPPLY Tp = 426C 10 20 30 40 TOTAL SUPPLY VOLTAGE, V+ TO V- (VOLTS) INPUT BIAS CURRENT (nA) 1 jz) INPUT NOISE VOLTAGE (nvA MAXIMUM OUTPUT (VOLTS) INPUT BIAS CURRENT vs TEMPERATURE Vg=+15V -50 0 50 TEMPERATURE (C) 100 TOTAL INPUT NOISE VOLTAGE vs FREQUENCY 000 Rgq = Rgg = 200kS2 THERMAL NOISE itt 1 EXCLUDED 100 1 10 FREQUENCY (Hz) 700 MAXIMUM OUTPUT VOLTAGE vs LOAD RESISTANCE 20 Vg = +18V Ty = 425C Vin = #10mV 15 POSITIVE SWING NEGATIVE SWING 0 100 1k LOAD RESISTANCE TO GROUND (2) 10k PEAK-TO-PEAK AMPLITUDE (VOLTS) INPUT OFFSET CURRENT (nA) OUTPUT SHORT-CIRCUIT CURRENT (mA) 2.0 0.5 0 1k 10k 40 35 30 25 20 15 INPUT OFFSET CURRENT vs TEMPERATURE Vg = 415V 50 6 50 TEMPERATURE (C) 100 MAXIMUM OUTPUT SWING vs FREQUENCY Vg = 18 Ty = 425C 100k 1M FREQUENCY (Hz) OUTPUT SHORT-CIRCUIT CURRENT vs TIME Vg = +15V Ta = 425C 0 4 2 3 4 TIME FROM OUTPUT BEING SHORTED (MINUTES)OP77 APPLICATIONS INFORMATION PRECISION HIGH-GAIN DIFFERENTIAL BILATERAL CURRENT SOURCE AMPLIFIER BASIC CURRENT SOURCE R2 R3 wae en" +15V R1 Vin \ 100kQ. R2 RY 2 v MMA 100k 1k2. a) R3 3 R4 1kQ. = WN lout < 18mA va ey = 100mA CURRENT SOURCE a Ww +1BV Vin We 2 2N2222 The high gain, gain linearity, CMRR, and low TCVg5 of the OP-77 make it possible to obtain performance not Re 3 previously available in single stage very high-gain 22907 So amplifier applications. R4 -18V = WA ee Igy < 100mA For best CMR, C4 must equal AS .In this example, R3 R2 R4 fout= Yin Ar-nS with a 10mV differential signal, the maximum errors are GIVEN R3= R4 + AG, RI = R2 as listed. These current sources will supply both positive and TYPE AMOUNT negative current into a grounded load. COMMON-MODE VOLTAGE 0.01%/V R4 GAIN LINEARITY, WORST CASE 0.02% RS ( Ro | ) TCVos 0.003%/C Note that Zo~ aOR TClos ____0,0089%6/2C R2 ORT and that for Zo to be infinite, R5+R4 _ R38 ISOLATING LARGE CAPACITIVE LOADS R2 must = Ri 1002 pourra T CLoap This circuit reduces maximum slew-rate but allows driving capacitive loads of any size without instability. Because the 1000 resistor is inside the feedback loop, its effect on output impedance is reduced to insig- nificance by the high open-loop gain of the OP-77.OP77 PRECISION CURRENT SINKS HIGH STABILITY VOLTAGE REFERENCE POSITIVE CURRENT SINK RL Io Vin + 2000 OP-77 IRF520 i.< VIN O-RT Vin 20V Ig = 1A/V Ri Ww POSITIVE CURRENT SOURCE RI a AAA L 2000 | oP-77 IRF520 vine_]- I' Vin Ig= RT Ry, Vin SOV These simple high current sinks require that the load float between the power supply and the sink. In these circuits, OP-77s high gain, high CMRR, and low TCVos assure high accuracy. FULL SCALE OF iv, bp0 E, = 10V $ R2 3.6k2, 1n4579A 2! : 6.4v 15% JN +5ppm/C Sra 3 64K0 This simple bootstrapped voltage reference provides a precise 10 volts virtually independent of changes in power supply voltage, ambient temperature, and output loading. Correct zener operating current of exactly 2mA is maintained by R1, a selected 5ppm/C resistor, connected to the regulated output. Accuracy is primar- ily determined by three factors: the 5ppm/C tempera- ture coefficient of D1, 1ppm/C ratio tracking of R2 and R3, and operational amplifier Vos errors. Voserrors, amplified by 1.6 (Ayc_L), appear at the output and can be significant with most monolithic amplifiers. For example: an ordinary amplifier with TCVog of SuV/C contributes 0.8ppm/C of output error while the OP-77, with TCVog of 0.3nV/C, contributes but 0.05ppm/C of output error, thus effectively eliminating TCVogs as an error consideration. PRECISION ABSOLUTE VALUE AMPLIFIER C1 [- 30pF $0 Vout -16V The high gain and low TCVog assure accurate opera- tion with inputs from microvolts to volts. In this circuit, the signal always appears as a common-mode signal to 0<Voyr < tov 15V the op amps. The OP-77E CMRR of 1.V/V assures errors of less than 2ppm. -10-OP77 LOW NOISE PRECISION REFERENCE +15V O 1 buffering of the averaged REF-01 voltage outputs. + 2 2 2 104F REF-01 6 REF-01 6 REF-01 6 = Yo Vo Vo o Vv F T EF Lge ms 10022 yy 1002 Fem 0.1nF This circuit relies upon OP-77's low TCVos and noise aL combined with very high CMRR to provide precision ~ PRECISION POSITIVE PEAK DETECTOR 1k2Q Cy must be of polystyrene, Teflon, or polyethylene to minimize dielectric absorption and leakage. The droop +15V -15V IL RESET TkQ | rate is determined by the size of C,jand the bias current of the OP-41. Teflon is a registered trademark of the Dupont Company. -11-OP77 PRECISION THRESHOLD DETECTOR/ AMPLIFIER Se | i Re 100k2 +75V Rg 2 D1 VTH OA 1N4148 1k2Q Vv Rt ; *o Vout ViN OWA >t 2k ~16V > When Vin < VrH, amplifier output swings negative, re- verse biasing diode D1. Voy7 = Vin if RL = @&. When Viv 2 Vrp, the loop closes, Re Vout = VtH + (Vin = VtH) { 1+ s . Ccis selected to smooth the response of the loop. -12- PRECISION TEMPERATURE SENSOR +15V t O.1KF At 1K | 2 VIN Ra Re Vol WA TRIM pa 50k m REF-02 Rot oP-77 Vout Is 1.5kO, TEMP A + GND 4 O.1yF Rop 6 t -15V RESISTOR VALUES TCVoy7 SLOPE (8) 1OmVv/So 100mv/C 10mV/? F TEMPERATURE -55C to -55C to -67F to RANGE +126C +125C +257C OUTPUT VOLTAGE -0.55V to -$.5V to -0.67V to RANGE +1.25V +12.5V +2.57V ZERO-SCALE ov @o0rc ov @0s OV @ OF Rag (+1% Resistor) 9.09k0 15k 7.6kQ Rp1 (41% Resistor) 1.5kQ 1,82k0. 4.21k0 Rbp (Potentiometer) 2002) 5000 2000 R, (1% Resistor) 5.11kQ 84.5k0 8.25ki)