Precision, Low Power, Micropower Dual Operational Amplifier Op290

Transcript

Precision, Low Power, Micropower Dual Operational Amplifier OP290 PIN CONNECTIONS Single-/dual-supply operation: 1.6 V to 36 V, ±0.8 V to ±18 V True single-supply operation; input and output voltage Input/output ranges include ground Low supply current (per amplifier), 20 µA maximum High output drive, 5 mA minimum Low input offset voltage, 200 µV typical High open-loop gain, 400 V/mV minimum Outstanding PSRR, 5.6 µV/V maximum Industry standard 8-Mead dual pinout OP290 OUT A 1 8 V+ –IN A 2 7 OUT B +IN A 3 6 –IN B V– 4 5 +IN B B A – + + – 00327-001 FEATURES Figure 1. PDIP (P-Suffix) 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 output swing also includes ground when operating from a single supply, enabling zero-in, zero-out operation. The OP290 draws less than 20 μA of quiescent supply current per amplifier, while being able to deliver over 5 mA of output current to a load. Input offset voltage is below 200 μV, 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 μV/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 V– ELECTRONICALLY ADJUSTED ON CHIP FOR MINIMUM OFFSET VOLTAGE 00327-002 NULL Figure 2. Simplified Schematic (One of Two Amplifiers Is Shown) 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. Specifications subject to change without notice. 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. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 ©1988–2009 Analog Devices, Inc. All rights reserved. OP290 TABLE OF CONTENTS Features .............................................................................................. 1 Battery-Powered Applications .....................................................9 Pin Connections ............................................................................... 1 Input Voltage Protection ..............................................................9 General Description ......................................................................... 1 Single-Supply Output Voltage Range..........................................9 Revision History ............................................................................... 2 Applications Information .............................................................. 10 Specifications..................................................................................... 3 Temperature to 4 mA to 20 mA Transmitter .......................... 10 Electrical Characteristics ............................................................. 3 Variable Slew Rate Filter ............................................................ 11 Absolute Maximum Ratings............................................................ 5 Low Overhead Voltage Reference ............................................ 11 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 12 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 12 Theory of Operation ........................................................................ 9 REVISION HISTORY 4/09—Rev. B to Rev. C Updated Format .................................................................. Universal Changes to Features Section and Figure 2..................................... 1 Changes to Input Voltage Range, Vs = ±5 V Parameter, Table 1 ................................................................................................ 3 Changes to Figure 7 and Figure 8 ................................................... 6 Deleted Figure 2; Renumbered Sequentially................................. 7 Changes to Figure 9 .......................................................................... 7 Changed Applications Information Heading to Theory of Operation ........................................................................................... 9 Changes to Figure 19 ........................................................................ 9 Changed Applications Heading to Applications Information .. 10 Changes to Temperature to 4 mA to 20 mA Transmitter Section, Figure 20, and Table 5 .................................................................... 10 Changes to Figure 21 and Figure 22 ............................................. 11 Updated Outline Dimensions ....................................................... 12 Changes to Ordering Guide .......................................................... 12 12/03—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—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. C | Page 2 of 12 OP290 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VS = ±1.5 V to ±15 V, TA = 25°C, unless otherwise noted. Table 1. Parameter INPUT OFFSET VOLTAGE INPUT OFFSET CURRENT INPUT BIAS CURRENT LARGE-SIGNAL VOLTAGE GAIN Symbol VOS IOS IB AVO INPUT VOLTAGE RANGE 1 IVR OUTPUT VOLTAGE SWING VO VOH, VOL COMMON-MODE REJECTION CMR POWER SUPPLY REJECTION RATIO SUPPLY CURRENT (ALL AMPLIFIERS) PSRR ISY CAPACITIVE LOAD STABILITY INPUT NOISE VOLTAGE1 INPUT RESISTANCE DIFFERENTIAL MODE INPUT RESISTANCE COMMON MODE SLEW RATE GAIN BANDWIDTH PRODUCT CHANNEL SEPARATION 2 en p-p RIN RINCM SR GBWP CS 1 2 Conditions VCM = 0 V VCM = 0 V VS = ±15 V, VO = ±10 V RL = 100 kΩ RL = 10 kΩ RL = 2 kΩ V+ = 5 V, V− = 0 V, 1 V < VO < 4 V RL = 100 kΩ RL = 10 kΩ V+ = 5 V, V − = 0 V VS = ±5 V VS = ±5 V RL = 10 kΩ RL = 2 kΩ V+ = 5 V, V− = 0 V RL = 10 kΩ V+ = 5 V, V− = 0 V, 0 V < VCM < 4 V VS = ±15 V, −15 V < VCM < +13.5 V VS = ±1.5 V VS = ±15 V AV = +1, no oscillations fO = 0.1 Hz to 10 Hz, VS = ±15 V VS = ±15 V VS = ±15 V AV = +1, VS = ±15 V VS = ±15 V fO = 10 Hz, VO = 20 V p-p, VS = ±15 V Guaranteed by CMR test. Guaranteed but not 100% tested. Rev. C | Page 3 of 12 Min OP290G Typ 125 0.1 4.0 Max 500 5 25 Unit μV nA nA 400 200 100 600 400 200 V/mV V/mV V/mV 100 70 0/4 −5/+3.5 250 140 V/mV V/mV V V ±13.5 ±10.5 4.0 10 80 90 ±14.2 ±11.5 4.2 50 100 120 3.2 19 25 650 3 30 20 12 20 150 V V V μV dB dB μV/V μA μA pF μV p-p MΩ GΩ V/ms kHz dB 5 120 10 30 40 OP290 VS = ±1.5 V to ±15 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted. Table 2. Parameter INPUT OFFSET VOLTAGE AVERAGE INPUT OFFSET VOLTAGE DRIFT INPUT OFFSET CURRENT INPUT BIAS CURRENT LARGE-SIGNAL VOLTAGE GAIN Symbol VOS TCVOS IOS IB AVO INPUT VOLTAGE RANGE 1 IVR OUTPUT VOLTAGE SWING VO COMMON-MODE REJECTION VOH VOL CMR POWER SUPPLY REJECTION RATIO SUPPLY CURRENT (ALL AMPLIFIERS) PSRR ISY 1 Conditions VS = ±15 V VCM = 0 V VCM = 0 V VS = ±5 V, VO = ±0 V RL = 100 kΩ RL = 10 kΩ RL = 2 kΩ V+ = 5 V, V− = 0 V, 1 V < VO < 4 V RL = 100 kΩ RL = 10 kΩ V+ = 5 V, V− = 0 V VS = +15 V VS = ±15 V RL = 10 kΩ RL = 2 kΩ V+ = 5 V, V − = 0 V, RL = 2 kΩ V+ = 5 V, V − = 0 V, RL = 10 kΩ 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. Rev. C | Page 4 of 12 Min OP290G Typ 200 1.2 0.1 4.2 Max 750 7 25 Unit μV μV/°C nA nA 300 150 75 600 250 125 V/mV V/mV V/mV 80 40 0/3.5 –15/+13.5 160 90 V/mV V/mV V V ±13 ±10 3.9 ±14 ±11 4.1 10 100 110 5.6 24 31 V V V μV dB dB μV/V μA μA 80 90 100 15 50 60 OP290 ABSOLUTE MAXIMUM RATINGS Table 3. 1 Parameter Supply Voltage Differential Input Voltage Common-Mode Input Voltage Output Short-Circuit Duration Storage Temperature Range Operating Temperature Range Junction Temperature Range (TJ) Lead Temperature (Soldering, 60 sec) Rating ±18 V [(V−) − 20 V] to [(V+) + 20 V] [(V−) − 20 V] to [(V+) + 20 V] Indefinite −65°C to +150°C −40°C to +85°C −65°C to +150°C 300°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 4. Package Type 8-Lead Plastic DIP (P) 1 1 Absolute maximum ratings applies to packaged part. θJA1 96 θJC 37 Unit °C/W θJA is specified for worst-case mounting conditions, that is, θJA is specified for device in socket for PDIP package. ESD CAUTION Rev. C | Page 5 of 12 OP290 TYPICAL PERFORMANCE CHARACTERISTICS 100 44 VS = ±15V NO LOAD 36 80 SUPPLY CURRENT (µA) INPUT OFFSET VOLTAGE (µV) 40 60 40 32 28 VS = ±15V 24 20 VS = ±1.5V 16 12 20 –25 0 25 50 75 100 125 TEMPERATURE (°C) 4 –75 00327-003 –50 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) Figure 3. Input Offset Voltage vs. Temperature 00327-006 8 0 –75 Figure 6. Supply Current vs. Temperature 600 0.15 RL = 10kΩ VS = ±15V 500 0.13 OPEN-LOOP GAIN (V/mV) INPUT OFFSET CURRENT (nA) 0.14 0.12 0.11 0.10 0.09 0.08 0.07 TA = 25°C 400 TA = 85°C 300 TA = 125°C 200 100 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) 0 00327-004 0.05 –75 0 5 10 15 20 25 30 SUPPLY VOLTAGE (V) 00327-007 0.06 Figure 7. Open-Loop Gain vs. Supply Voltage Figure 4. Input Offset Current vs. Temperature 140 4.5 VS = ±15V 4.4 120 VS = ±15V TA = 25°C RL = 10kΩ 4.1 4.0 3.9 3.8 100 0 GAIN 80 45 PHASE 60 90 40 135 20 180 PHASE SHIFT (Degrees) OPEN-LOOP GAIN (dB) 4.2 3.7 3.5 –75 –50 –25 0 25 50 75 100 TEMPERATURE (°C) 125 0 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz) Figure 8. Open-Loop Gain and Phase Shift vs. Frequency Figure 5. Input Bias Current vs. Temperature Rev. C | Page 6 of 12 00327-008 3.6 00327-005 INPUT BIAS CURRENT (nA) 4.3 OP290 60 140 TA = 25°C G = 10 20 G=1 0 –20 10 100 1k 10k 100k FREQUENCY (Hz) NEGATIVE SUPPLY 120 100 POSITIVE SUPPLY 80 60 40 1 TA = 25°C VS = ±15V 4 3 2 1k 10k 100k LOAD RESISTANCE (Ω) 100 80 60 40 00327-010 1 100 1k FREQUENCY (Hz) Figure 10. Output Voltage Swing vs. Load Resistance Figure 13. Common-Mode Rejection vs. Frequency 16 1k TA = 25°C VS = ±15V NOISE VOLTAGE DENSITY (nV/ Hz) TA = 25°C VS = ±15V 12 10 8 6 4 1k 10k LOAD RESISTANCE (Ω) 100k 00327-011 2 0 100 10 100 10 0.1 1 10 100 FREQUENCY (Hz) Figure 11. Output Voltage Swing vs. Load Resistance Figure 14. Noise Voltage Density vs. Frequency Rev. C | Page 7 of 12 1k 00327-014 0 100 120 00327-013 COMMON-MODE REJECTION (dB) OUTPUT VOLTAGE SWING (V) 140 TA = 25°C V+ = 5V V– = 0V 1 OUTPUT VOLTAGE SWING (V) 1k Figure 12. Power Supply Rejection vs. Frequency 6 14 100 FREQUENCY (Hz) Figure 9. Closed-Loop Gain vs. Frequency 5 10 00327-012 POWER SUPPLY REJECTION (dB) G = 100 40 00327-009 CLOSED-LOOP GAIN (dB) TA = 25°C VS = ±15V OP290 10 CURRENT NOISE DENSITY (nV/ Hz) TA = 25°C VS = ±15V TA = 25°C VS = ±15V AV = +1 100 R = 10kΩ L 90 CL = 500pF 1 10 1 10 100 1k FREQUENCY (Hz) 5V Figure 17. Large-Signal Transient Response Figure 15. Current Noise Density vs. Frequency 100 90 TA = 25°C VS = ±15V AV = +1 RL = 10kΩ CL = 500pF 10 100µs 00327-016 0% 20mV 1ms Figure 16. Small-Signal Transient Response Rev. C | Page 8 of 12 00327-017 0.1 0.1 00327-015 0% OP290 THEORY OF OPERATION INPUT VOLTAGE PROTECTION 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 µA 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. 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. 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 18 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 kΩ load. SINGLE-SUPPLY OUTPUT VOLTAGE RANGE In single-supply operation, the OP290 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 MΩ 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 specification in Table 1. Output current source capability is maintained over the entire voltage range including ground. 100 80 60 40 20 0 0 500 1000 1500 2000 2500 3000 00327-020 LITHIUM SULPHUR DIOXIDE CELL VOLTAGE (V) BATTERY-POWERED APPLICATIONS 3500 HOURS Figure 18. Lithium Sulphur Dioxide Cell Discharge Characteristic with OP290 and 100 kΩ Load +15V +15V 1/2 OP290 1kΩ A V2 OP37 9kΩ 10kΩ 100Ω –15V –15V 1/2 OP290 V1 20V p-p @ 10Hz B V1 CHANNEL SEPARATION = 20 log V2/1000 Figure 19. Channel Separation Test Circuit Rev. C | Page 9 of 12 00327-019 VIN OP290 APPLICATIONS INFORMATION Calibration of the transmitter is simple. First, the slope of the output current vs. temperature is calibrated by adjusting the span trim, R7. A couple of iterations may be required to ensure that the slope is correct. TEMPERATURE TO 4 MA TO 20 mA TRANSMITTER A simple temperature to 4 mA to 20 mA transmitter is shown in Figure 20. After calibration, the transmitter is accurate to +0.5°C over the −50°C to +150°C 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 pin while the other half regulates the output current to satisfy the current summation at its noninverting input. VTEMP (R6 + R7 ) R2 × R10  R2 × R6 × R7   − VSET   R2 × R10     ∆I FS I OUT =   ∆TOPERATING (1) Table 5 shows the values of R6 that are required for various temperature ranges. The change in output current with temperature is the derivative of the following transfer function: ∆I OUT ∆T ∆VTEMP (R6 + R7 ) = ∆T R2 × R10  (TA − TMIN ) + 4 mA   Table 5. Temperature Range 0°C to +70°C −40°C to +85°C −50°C to +150°C (2) From Equation 1 and Equation 2, 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. R6 (k Ω) 10 6.2 3 1N4002 V+ 8V TO 40V VIN REF43 VOUT 2 R1 VTEMP 3 10kΩ 4 GND R4 20kΩ 2 1/2 6 1 VTEMP 6 R2 1kΩ 4 R3 100kΩ SPAN TRIM R7 5kΩ 8 OP290GP 3 R6 3kΩ 1/2 R5 5kΩ VSET 5 OP290GP ZERO TRIM 7 R8 1kΩ 2N1711 R9 100kΩ R10 100Ω 1%, 1/2W IOUT RL Figure 20. Temperature to 4 mA to 20 mA Transmitter Rev. C | Page 10 of 12 00327-021 I OUT = Once the span trim has been completed, the zero trim can be made. Remember that adjusting the offset trim does not affect the gain. The offset trim can be set at any known temperature by adjusting R5 until the output current equals OP290 VARIABLE SLEW RATE FILTER LOW OVERHEAD VOLTAGE REFERENCE The circuit shown in Figure 21 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 that 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. Diode D1 and Diode 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 the output of A2 slewing at a maximum rate of Figure 22 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 μV/V with load regulation better than 10 μV/mA with up to 50 mA of output current. 0. 6 V VD Maximum slew rate = ≈ R3 × C2 R3 × C2 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. The REF43 provides a stable 2.5 V that is multiplied by the OP290. The PNP output transistor enables the output voltage to approach the supply voltage. Resistor R1 and Resistor R2 determine the output voltage. R2  VOUT = 2.5 V1 +   R1  The 200 Ω 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. V+ 2 +15V VIN R1 250kΩ REF43FZ 8 2 C1 0.1µF 1/2 A1 OP290GP VOUT 1 6 8 2 1/2 3 OP290GP GND 4 R2 100kΩ 1 2N2907A 3 4 VOUT R1A 2.37Ω 1% D1 R4 25kΩ D2 C2 4700pF R1B 200Ω 20-TURN BOURNS 3006P-1-201 C1 10µF 6 1/2 A2 5 OP290GP 7 VOUT Figure 22. Low Overhead Voltage Reference –15V 00327-022 4 DIODES ARE 1N4148 C2 0.1µF 00327-023 R3 1MΩ R2 2kΩ 1% Figure 21. Variable Slew Rate Filter Rev. C | Page 11 of 12 OP290 OUTLINE DIMENSIONS 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 8 5 1 4 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.100 (2.54) BSC 0.060 (1.52) MAX 0.210 (5.33) MAX 0.015 (0.38) MIN 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) SEATING PLANE 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) GAUGE PLANE 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.430 (10.92) MAX 0.005 (0.13) MIN COMPLIANT TO JEDEC STANDARDS MS-001 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. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. 070606-A 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) Figure 23. 8-Lead Plastic Dual In-Line Package [PDIP] [P-Suffix] (N-8) Dimensions shown in inches and (millimeters) ORDERING GUIDE Model OP290GP OP290GPZ 1 1 TA = 25°C VOS Max (mV) 500 500 Temperature Range −40°C to +85°C −40°C to +85°C Package Description 8-Lead Plastic PDIP 8-Lead Plastic PDIP Z = RoHS Compliant Part. ©1988–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00327-0-4/09(C) Rev. C | Page 12 of 12 Package Option P-Suffix (N-8) P-Suffix (N-8)