a Precision, Low Power, Micropower Dual Operational Amplifier OP290 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 (Per Amplifier), 20 A Max High Output Drive, 5 mA Min Low Input Offset Voltage, 200 V Max High Open-Loop Gain, 700 V/mV Min Outstanding PSRR, 5.6 V/V Max Industry Standard 8-Lead Dual Pinout Available in Die Form PIN CONNECTIONS PDIP (P-Suffix) OUT A 1 A B 8 V+ 7 OUT B -IN A 2 +IN A 3 6 -IN B V- 4 5 +IN B OP290 GENERAL DESCRIPTION The OP290 is a high performance micropower dual 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. Input voltage range includes the negative rail allowing the OP290 to accommodate input signals down to ground in single-supply operation. The OP290's output swing also includes ground when operating from a single supply, enabling "zero-in, zero-out" operation. The OP290 draws less than 20 A of quiescent supply current per amplifier, while able to deliver over 5 mA of output current to a load. Input offset voltage is below 200 V eliminating the need for external nulling. Gain exceeds 700,000 and common-mode rejection is better than 100 dB. The power supply rejection ratio of under 5.6 V/V minimizes offset voltage changes experienced in battery-powered systems. The low offset voltage and high gain offered by the OP290 bring precision performance to micropower applications. The minimal voltage and current requirements of the OP290 suit it for battery- and solar-powered applications, such as portable instruments, remote sensors, and satellites. For a single op amp, see the OP90; for a quad, see the OP490. V+ +IN OUTPUT -IN NULL NULL V ELECTRONICALLY ADJUSTED ON CHIP FOR MINIMUM OFFSET VOLTAGE Figure 1. Simplified Schematic (one of two amplifiers is shown) 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. Trademarks and registered trademarks are the property of their respective owners. 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 (c) 2003 Analog Devices, Inc. All rights reserved. OP290-SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter Symbol INPUT OFFSET VOLTAGE VOS INPUT OFFSET CURRENT IOS INPUT BIAS CURRENT LARGE-SIGNAL VOLTAGE GAIN (@ VS = 1.5 V to 15 V, TA = 25C, unless otherwise noted.) Conditions Min OP290G Typ Max Unit 125 500 V VCM = 0 V 0.1 5 nA IB VCM = 0 V 4.0 25 nA AVO VS = 15 V, VO = 10 V RL = 100 k RL = 10 k RL = 2 k V+ = 5 V, V- = 0 V, 1 V < VO < 4 V RL = 100 k RL = 10 k 400 200 100 600 400 200 V/mV V/mV V/mV 100 70 250 140 V/mV V/mV INPUT VOLTAGE RANGE1 IVR V+ = 5 V, V- = 0 V V S = 5 V1 0/4 -15/13.5 OUTPUT VOLTAGE SWING VO VS = 5 V RL = 10 k RL = 2 k V+ = 5 V, V- = 0 V RL = 10k 13.5 10.5 4.0 10 14.2 11.5 4.2 50 V V V V 80 100 dB 90 120 dB VOH, VOL COMMON-MODE REJECTION CMR POWER SUPPLY REJECTION RATIO PSRR SUPPLY CURRENT (All Amplifiers) ISY CAPACITIVE LOAD STABILITY V+ = 5 V, V- = 0 V 0 V < VCM < 4 V VS = 15 V, -15 V < VCM < +13.5 V V V 3.2 10 V/V VS = 1.5 V VS = 15 V 19 25 30 40 A A AV = +1 No Oscillations 650 pF INPUT NOISE VOLTAGE1 enp-p fO = 0.1 Hz to 10 Hz VS = 15 V 3 V p-p INPUT RESISTANCE DIFFERENTIAL-MODE RIN VS = 15 V 30 M INPUT RESISTANCE COMMON-MODE RINCM VS = 15 V 20 G SLEW RATE SR AV = +1 VS = 15 V 12 V/ms GAIN BANDWIDTH PRODUCT GBWP Vs = +15 V VS = 15 V 20 kHz CHANNEL SEPARATION2 CS fO = 10 Hz VO = 20 V p-p VS = 15 V2 150 dB 5 120 NOTES 1 Guaranteed by CMR test. 2 Guaranteed but not 100% tested. Specifications subject to change without notice. -2- REV. B OP290 ELECTRICAL CHARACTERISTICS (@ VS = 1.5 V to 15 V, -40C TA +85C for OP290G, unless otherwise noted.) Conditions Min OP290G Typ Max 200 750 Parameter Symbol INPUT OFFSET VOLTAGE VOS AVERAGE INPUT OFFSET VOLTAGE DRIFT TCVOS VS = 15 V 1.2 INPUT OFFSET CURRENT IOS VCM = 0 V 0.1 7 nA INPUT BIAS CURRENT IB VCM = 0 V 4.2 25 nA LARGE-SIGNAL VOLTAGE GAIN AVO VS = 5 V, VO = 0 V RL = 100 k RL = 10 k RL = 2 k V+ = 5 V, V- = 0 V, 1 V < VO < 4 V RL = 100 k RL = 10 k INPUT VOLTAGE RANGE* IVR V+ = 5 V, V- = 0 V VS = +15 V* OUTPUT VOLTAGE SWING VO VS = 15 V RL = 10 k RL = 2 k V+ = 5 V, V- = 0 V RL = 2 k V+ = 5 V, V- = 0 V RL = 10 k VOH VOL COMMON-MODE REJECTION CMR POWER SUPPLY REJECTION RATIO PSRR SUPPLY CURRENT (All Amplifiers) ISY V+ = 5 V, V- = 0 V, 0 V < VCM < 3.5 V VS = 15 V -15 V < VCM < 13.5 V VS = 1.5 V VS = 15 V *Guaranteed by CMR test. Specifications subject to change without notice. REV. B -3- Unit V V/C 300 150 75 600 250 125 V/mV V/mV V/mV 80 40 160 90 V/mV V/mV 0/3.5 -15/+13.5 V V 13 10 14 11 V V 3.9 4.1 V 10 100 V 80 100 dB 90 110 dB 5.6 15 V/V 24 31 50 60 A A OP290 ABSOLUTE MAXIMUM RATINGS 1 ORDERING GUIDE Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Differential Input Voltage . . . . [(V-) - 20 V] to [(V+) + 20 V] Common-Mode Input Voltage . [(V-) - 20 V] to [(V+) + 20 V] Output Short-Circuit Duration . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range P Package . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Operating Temperature Range OP290G . . . . . . . . . . . . . . . . . . . . . . . . . . . -40C to +85C Junction Temperature (TJ) . . . . . . . . . . . . . -65C to +150C Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300C Package Type JA2 JC Unit 8-Lead Plastic DIP (P) 96 37 C/W Model Temperature Range TA = 25C VOS Max (mV) Package Description OP290GP XIND 500 PDIP NOTES 1 Absolute Maximum Ratings applies to packaged part. 2 JA is specified for worst-case mounting conditions, i.e., JA is specified for device in socket for PDIP package. 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 OP290 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. -4- WARNING! ESD SENSITIVE DEVICE REV. B Typical Performance Characteristics-OP290 60 40 20 0.12 0.10 0.08 0.06 0 0 25 50 75 -75 -50 -25 TEMPERATURE - C 28 VS = 15V 20 16 VS = 1.5V 12 TA = 85 C 400 300 TA = 125 C 200 100 8 4 0 25 50 75 -75 -50 -25 TEMPERATURE - C 0 100 125 5 10 15 20 TEMPERATURE - C 25 20 0 100 GAIN 80 80 PHASE 60 60 40 40 20 20 0 5 100 1k 10k FREQUENCY - Hz 100k 4 3 2 1 TPC 7. Closed-Loop Gain vs. Frequency REV. B 0 100 5 10 15 20 FREQUENCY - Hz 25 0 30 14 12 10 8 6 4 2 -20 10 120 16 OUTPUT VOLTAGE SWING - V OUTPUT VOLTAGE SWING - V 40 140 TA = 25 C VS = 15V RL = 100k TPC 6. Open-Loop Gain and Phase Shift vs. Frequency TA = 25 C V+ = 5V, V- = 0V TA = 25 C VS = 15V 100 125 100 0 30 6 60 CLOSED-LOOP GAIN - dB 0 TPC 5. Open-Loop Gain vs. Single-Supply Voltage TPC 4. Supply Current vs. Temperature 3.7 120 OPEN-LOOP GAIN - dB OPEN-LOOP GAIN - V/mV SUPPLY CURRENT - A 32 3.9 3.8 140 TA = 25 C 500 36 4.0 TPC 3. Input Bias Current vs. Temperature RL = 10k NO LOAD 40 24 100 125 600 44 4.1 3.5 -75 -50 -25 0 25 50 75 TEMPERATURE - C TPC 2. Input Offset Current vs. Temperature TPC 1. Input Offset Voltage vs. Temperature 4.3 4.2 3.6 0 25 50 75 -75 -50 -25 TEMPERATURE - C 100 125 VS = 15V 4.4 INPUT BIAS CURRENT - nA 80 4.5 VS = 15V 0.14 1k 10k LOAD RESISTANCE - 100k TPC 8. Ouput Voltage Swing vs. Load Resistance -5- PHASE SHIFT - Degrees VS = 15V INPUT OFFSET CURRENT - nA INPUT OFFSET VOLTAGE - V 100 0 100 TA = 25 C VS = 15V 1k 10k LOAD RESISTANCE - 100k TPC 9. Output Voltage Swing vs. Load Resistance OP290 NEGATIVE SUPPLY 120 100 POSITIVE SUPPLY 80 60 120 100 60 40 1 10 100 FREQUENCY - Hz 1 1k TPC 10. Power Supply Rejection vs. Frequency CURRENT NOISE DESTINY- nV/ Hz 1,000 10 100 FREQUENCY - Hz 10 0.1 1k TPC 11. Common-Mode Rejection vs. Frequency 1 10 100 FREQUENCY - Hz 1k TPC 12. Noise Voltage Density vs. Frequency TA = 25 C VS = 15V 100 100 90 90 TA = 25 C VS = 15V AV = +1 RL = 10k CL = 500pF TA = 25 C VS = 15V AV = +1 RL = 10k CL = 500pF 1 10 10 0% 0% 20mV 0.1 0.1 TA = 25 C VS = 15V 100 80 40 10 TA = 25 C VS = 15V NOISE VOLTAGE DESTINY- nV/ Hz 140 TA = 25 C COMMON-MODE REJECTION - dB POWER SUPPLY REJECTION - dB 140 1 10 100 FREQUENCY - Hz TPC 13. Current Noise Density vs. Frequency 100s 5V 1ms 1k TPC 14. Small-Signal Transient Response -6- TPC 15. Large-Signal Transient Response REV. B OP290 +18V +15V +15V 8 100k 1/2 2 200 3 6 OP290 1/2 OP290 A 1k V2 OP37A 9k 1/2 OP290 100k 1 10k 100 7 -15V 5 -15V VIN 4 1/2 OP290 V1 20Vp-p @ 10Hz B V1 CHANNEL SEPARATION = 20 LOG V2/1000 -18V Figure 3. Channel Separation Test Circuit Figure 2. Burn-In Circuit The OP290 can be operated on a minimum supply voltage of 1.6 V, or with dual supplies of 0.8 V, and draws only 19 pA of supply current. In many battery-powered circuits, the OP290 can be continuously operated for thousands of hours before requiring battery replacement, reducing equipment downtime and operating cost. High-performance portable equipment and instruments frequently 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 OP290, combined with the flat discharge characteristic of the lithium cell, indicates that the OP290 can be operated over the entire useful life of the cell. Figure 1 shows the typical discharge characteristic of a 1 Ah lithium cell powering an OP290 with each amplifier, in turn, driving full output swing into a 100 k load. APPLICATIONS TEMPERATURE TO 4-20 mA TRANSMITTER A simple temperature to 4-20 mA transmitter is shown in Figure 5. After calibration, the transmitter is accurate to +0.5C over the -50C to +150C temperature range. The transmitter operates from 8 V to 40 V with supply rejection better than 3 ppm/V. One half of the OP290 is used to buffer the VTEMP pins while the other half regulates the output current to satisfy the current summation at its noninverting input. IOUT = INPUT VOLTAGE PROTECTION The OP290 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 provide a large amount of input protection, allowing the inputs to be taken 20 V beyond either supply without damaging the amplifier. 80 60 40 20 0 SINGLE-SUPPLY OUTPUT VOLTAGE RANGE In single-supply operation the OP290'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 OP290 has voltage gain equal to the data sheet specification. Output current source capability is maintained over the entire voltage range including ground. REV. B VTEMP ( R6 + R7) R2 R6 R7 - VSET R2 R10 R2 R10 100 LITHIUM SULPHUR DIOXIDE CELL VOLTAGE - V APPLICATIONS INFORMATION BATTERY-POWERED APPLICATIONS 0 500 1000 1500 2000 HOURS 2500 3000 3500 Figure 4. Lithium Sulphur Dioxide Cell Discharge Characteristic with OP290 and 100 k Loads The change in output current with temperature is the derivative of the transfer function: IOUT = T -7- VTEMP (R6 + R7) T R2 R10 OP290 VARIABLE SLEW RATE FILTER From the formulas, it can be seen that if the span trim is adjusted before the zero trim, the two trims are not interactive, which greatly simplifies the calibration procedure. The circuit shown in Figure 6 can be used to remove pulse noise from an input signal without limiting the response rate to a genuine signal. The nonlinear filter has use in applications where the input signal of interest is known to have physical limitations. An example of this is a transducer output where a change of temperature or pressure cannot exceed a certain rate due to physical limitations of the environment. The filter consists of a comparator which drives an integrator. The comparator compares the input voltage to the output voltage and forces the integrator output to equal the input voltage. A1 acts as a comparator with its output high or low. Diodes D1 and D2 clamp the voltage across R3 forcing a constant current to flow in or out of C2. R3, C2, and A2 form an integrator with A2's output slewing at a maximum rate of: Calibration of the transmitter is simple. First, the slope of the output current versus temperature is calibrated by adjusting the span trim, R7. A couple of iterations may be required to be sure the slope is correct. Once the span trim has been completed, the zero trim can be made. Remember that adjusting the offset trim will not affect the gain. The offset trim can be set at any known temperature by adjusting R5 until the output current equals: I FS IOUT = - TMIN ) + 4 mA (T TOPERATING AMBIENT 0.6 V VD R3 C 2 R3 C 2 For an input voltage slewing at a rate under this maximum slew rate, the output simply follows the input with A1 operating in its linear region. Maximum slew rate = Table I shows the values of R6 required for various temperature ranges. Table I. Temperature Range R6 (k) 0C to +70C -40C to +85C -55C to +150C 10 6.2 3 1N4002 V+ 8V TO 40V SPAN TRIM VIN REF-43BZ 2 2 1/2 VOUT 6 VTEMP GND 3 R1 4 10k R6 R4 20k 8 OP290GP 1 VTEMP R2 3k 6 1k 1/2 4 R3 100k R7 5k R5 5k VSET 5 ZERO TRIM OP290GP 7 R8 1k 2N1711 R9 100k R10 100 1%, 1/2W IOUT RLOAD Figure 5. Temperature to 4-20 mA Transmitter -8- REV. B OP290 The 200 variable resistor is used to trim the output voltage. For the lowest temperature drift, parallel resistors can be used in place of the variable resistor and taken out of the circuit as required to adjust the output voltage. +15V R1 8 2 250k C1 0.1F 1/2 OP290GP 1 3 R2 100k V+ 2 VIN R3 1M REF-43FZ C1 R4 D1 VOUT D2 25k 6 OP290GP 8 2 1/2 GND 4700pF OP290GP 7 1 2N2907A 3 4 1/2 5 6 4 VOUT VOUT R2 4 R1A 2.37 1% -15V DIODES ARE 1N4148 R1B 200 20-TURN BOURNS 3006P-1-201 Figure 6. Variable Slew Rate Filter 2k 1% C1 10F LOW OVERHEAD VOLTAGE REFERENCE Figure 7 shows a voltage reference that requires only 0.1 V of overhead voltage. As shown, the reference provides a stable 4.5 V output with a 4.6 V to 36 V supply. Output voltage drift is only 12 ppm/C. Line regulation of the reference is under 5 V/V with load regulation better than 10 V/mA with up to 50 mA of output current. Figure 7. Low Overhead Voltage Reference The REF-43 provides a stable 2.5 V which is multiplied by the OP290. The PNP output transistor enables the output voltage to approach the supply voltage. Resistors R1 and R2 determine the output voltage. R2 VOUT = 2.5 V 1 + R1 REV. B -9- C2 0.1F OP290 OUTLINE DIMENSIONS 8-Lead Plastic Dual In-Line Package [PDIP] [P-Suffix] (N-8) Dimensions shown in inches and (millimeters) 0.375 (9.53) 0.365 (9.27) 0.355 (9.02) 8 5 1 4 0.295 (7.49) 0.285 (7.24) 0.275 (6.98) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.100 (2.54) BSC 0.180 (4.57) MAX 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.015 (0.38) MIN SEATING PLANE 0.060 (1.52) 0.050 (1.27) 0.045 (1.14) 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) 0.015 (0.38) 0.010 (0.25) 0.008 (0.20) COMPLIANT TO JEDEC STANDARDS MO-095AA CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN -10- REV. B OP290 Revision History Location Page 12/03--Data Sheet changed from REV. A to REV. B. Deleted OP290E and OP290F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Replaced PIN CONNECTIONS with PDIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Deleted ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Changes to TPC 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Change to SINGLE SUPPLY OUTPUT VOLTAGE RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Changes to Figure 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Changes to Figure 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Change to LOW OVERHEAD VOLTAGE REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1/02--Data Sheet changed from REV. 0 to REV. A. Edits to ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edits to PIN CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Edits to PACKAGE TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Edits to WAFER TEST LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Edits to DICE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 REV. B -11- -12- C00327-0-12/03(B)