Precision, Low Power, Micropower Dual Operational Amplifier OP290

Transcription

1 Precision, Low Power, Micropower Dual Operational Amplifier OP9 FEATURES Single-/dual-supply operation:. V to 3 V, ±.8 V to ±8 V True single-supply operation; input and output voltage Input/output ranges include ground Low supply current (per amplifier), µa maximum High output drive, 5 ma minimum Low input offset voltage, µv typical High open-loop gain, V/mV minimum Outstanding PSRR, 5. µv/v maximum Industry standard 8- ead dual pinout GENERAL DESCRIPTION The OP9 is a high performance micropower dual op amp that operates from a single supply of. V to 3 V or from dual supplies of ±.8 V to ±8 V. Input voltage range includes the negative rail allowing the OP9 to accommodate input signals down to ground in single-supply operation. The OP9 output swing also includes ground when operating from a single supply, enabling zero-in, zero-out operation. The OP9 draws less than 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 μv, eliminating the need for external nulling. Gain exceeds 7, and OUT A IN A +IN A 3 PIN CONNECTIONS V OP9 A + B + Figure. PDIP (P-Suffix) V+ OUT B IN B +IN B common-mode rejection is better than db. The power supply rejection ratio of under 5. μv/v minimizes offset voltage changes experienced in battery-powered systems. The low offset voltage and high gain offered by the OP9 bring precision performance to micropower applications. The minimal voltage and current requirements of the OP9 suit it for battery- and solar-powered applications, such as portable instruments, remote sensors, and satellites. For a single op amp, see the OP9; for a quad, see the OP V+ +IN OUTPUT IN NULL NULL ELECTRONICALLY ADJUSTED ON CHIP FOR MINIMUM OFFSET VOLTAGE Figure. Simplified Schematic (One of Two Amplifiers Is Shown) V 37- 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 9, Norwood, MA -9, U.S.A. Tel: Fax: Analog Devices, Inc. All rights reserved.

2 TABLE OF CONTENTS Features... Pin Connections... General Description... Revision History... Specifications... 3 Electrical Characteristics... 3 Absolute Maximum Ratings... 5 ESD Caution... 5 Typical Performance Characteristics... Theory of Operation... 9 Battery-Powered Applications...9 Input Voltage Protection...9 Single-Supply Output Voltage Range...9 Applications Information... Temperature to ma to ma Transmitter... Variable Slew Rate Filter... Low Overhead Voltage Reference... Outline Dimensions... Ordering Guide... REVISION HISTORY /9 Rev. B to Rev. C Updated Format... Universal Changes to Features Section and Figure... Changes to Input Voltage Range, Vs = ±5 V Parameter, Table... 3 Changes to Figure 7 and Figure 8... Deleted Figure ; Renumbered Sequentially... 7 Changes to Figure Changed Applications Information Heading to Theory of Operation... 9 Changes to Figure Changed Applications Heading to Applications Information.. Changes to Temperature to ma to ma Transmitter Section, Figure, and Table 5... Changes to Figure and Figure... Updated Outline Dimensions... Changes to Ordering Guide... /3 Rev. A to Rev. B Deleted OP9E and OP9F... Universal Replaced Pin Connections with PDIP... Deleted Electrical Characteristics... 3 Changes to Absolute Maximum Ratings... Changes to Ordering Guide... Changes to TPC... 5 Change to Single Supply Output Voltage Range... 7 Changes to Figure Changes to Figure... 9 Change to Low Overhead Voltage Reference... 9 Updated Outline Dimensions... / Rev. to Rev. A Edits to Ordering Information... Edits to Pin Connections... Edits to Absolute Maximum Ratings... Edits to Package Type... Edits to Wafer Test Limits... 5 Edits to Dice Characteristics... 5 Rev. C Page of

3 SPECIFICATIONS ELECTRICAL CHARACTERISTICS V S = ±.5 V to ±5 V,, unless otherwise noted. Table. OP9G Parameter Symbol Conditions Min Typ Max Unit INPUT OFFSET VOLTAGE V OS 5 5 μv INPUT OFFSET CURRENT I OS V CM = V. 5 na INPUT BIAS CURRENT I B V CM = V. 5 na LARGE-SIGNAL VOLTAGE GAIN A VO V S = ±5 V, V O = ± V R L = kω V/mV R L = kω V/mV R L = kω V/mV V+ = 5 V, V = V, V < V O < V R L = kω 5 V/mV R L = kω 7 V/mV INPUT VOLTAGE RANGE IVR V+ = 5 V, V = V / V V S = ±5 V 5/+3.5 V OUTPUT VOLTAGE SWING V O V S = ±5 V R L = kω ±3.5 ±. V R L = kω ±.5 ±.5 V V OH, V OL V+ = 5 V, V = V.. V R L = kω 5 μv COMMON-MODE REJECTION CMR V+ = 5 V, V = V, V < V CM < V 8 db V S = ±5 V, 5 V < V CM < +3.5 V 9 db POWER SUPPLY REJECTION RATIO PSRR 3. μv/v SUPPLY CURRENT (ALL AMPLIFIERS) I SY V S = ±.5 V 9 3 μa V S = ±5 V 5 μa CAPACITIVE LOAD STABILITY A V = +, no oscillations 5 pf INPUT NOISE VOLTAGE e n p-p f O =. Hz to Hz, V S = ±5 V 3 μv p-p INPUT RESISTANCE DIFFERENTIAL MODE R IN V S = ±5 V 3 MΩ INPUT RESISTANCE COMMON MODE R INCM V S = ±5 V GΩ SLEW RATE SR A V = +, V S = ±5 V 5 V/ms GAIN BANDWIDTH PRODUCT GBWP V S = ±5 V khz CHANNEL SEPARATION CS f O = Hz, V O = V p-p, V S = ±5 V 5 db Guaranteed by CMR test. Guaranteed but not % tested. Rev. C Page 3 of

4 V S = ±.5 V to ±5 V, C T A +85 C, unless otherwise noted. Table. OP9G Parameter Symbol Conditions Min Typ Max Unit INPUT OFFSET VOLTAGE V OS 75 μv AVERAGE INPUT OFFSET VOLTAGE DRIFT TCV OS V S = ±5 V. μv/ C INPUT OFFSET CURRENT I OS V CM = V. 7 na INPUT BIAS CURRENT I B V CM = V. 5 na LARGE-SIGNAL VOLTAGE GAIN A VO V S = ±5 V, V O = ± V R L = kω 3 V/mV R L = kω 5 5 V/mV R L = kω 75 5 V/mV V+ = 5 V, V = V, V < V O < V R L = kω 8 V/mV R L = kω 9 V/mV INPUT VOLTAGE RANGE IVR V+ = 5 V, V = V /3.5 V V S = +5 V 5/+3.5 V OUTPUT VOLTAGE SWING V O V S = ±5 V R L = kω ±3 ± V R L = kω ± ± V V OH V+ = 5 V, V = V, R L = kω 3.9. V V OL V+ = 5 V, V = V, R L = kω μv COMMON-MODE REJECTION CMR V+ = 5 V, V = V, V < V CM < 3.5 V 8 db V S = ± 5 V, 5 V < V CM < 3.5 V 9 db POWER SUPPLY REJECTION RATIO PSRR 5. 5 μv/v SUPPLY CURRENT (ALL AMPLIFIERS) I SY V S = ±.5 V 5 μa V S = ±5 V 3 μa Guaranteed by CMR test. Rev. C Page of

5 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Rating Supply Voltage ±8 V Differential Input Voltage [(V ) V] to [(V+) + V] Common-Mode Input Voltage [(V ) V] to [(V+) + V] Output Short-Circuit Duration Indefinite Storage Temperature Range 5 C to +5 C Operating Temperature Range C to +85 C Junction Temperature Range (T J ) 5 C to +5 C Lead Temperature 3 C (Soldering, sec) Absolute maximum ratings applies to packaged part. 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. Package Type θ JA θ JC Unit 8-Lead Plastic DIP (P) 9 37 C/W θ JA is specified for worst-case mounting conditions, that is, θ JA is specified for device in socket for PDIP package. ESD CAUTION Rev. C Page 5 of

6 TYPICAL PERFORMANCE CHARACTERISTICS NO LOAD INPUT OFFSET VOLTAGE (µv) 8 SUPPLY CURRENT (µa) V S = ±.5V TEMPERATURE ( C) Figure 3. Input Offset Voltage vs. Temperature TEMPERATURE ( C) Figure. Supply Current vs. Temperature 37- INPUT OFFSET CURRENT (na) OPEN-LOOP GAIN (V/mV) 5 3 R L = kω T A = 85 C TEMPERATURE ( C) Figure. Input Offset Current vs. Temperature SUPPLY VOLTAGE (V) Figure 7. Open-Loop Gain vs. Supply Voltage R L = kω INPUT BIAS CURRENT (na) OPEN-LOOP GAIN (db) 8 GAIN PHASE PHASE SHIFT (Degrees) TEMPERATURE ( C) Figure 5. Input Bias Current vs. Temperature k k k FREQUENCY (Hz) Figure 8. Open-Loop Gain and Phase Shift vs. Frequency 37-8 Rev. C Page of

7 CLOSED-LOOP GAIN (db) G = G = G = POWER SUPPLY REJECTION (db) 8 NEGATIVE SUPPLY POSITIVE SUPPLY k k k FREQUENCY (Hz) Figure 9. Closed-Loop Gain vs. Frequency 37-9 k FREQUENCY (Hz) Figure. Power Supply Rejection vs. Frequency 37- OUTPUT VOLTAGE SWING (V) 5 3 V+ = 5V V = V COMMON-MODE REJECTION (db) 8 k k k LOAD RESISTANCE (Ω) Figure. Output Voltage Swing vs. Load Resistance 37- k FREQUENCY (Hz) Figure 3. Common-Mode Rejection vs. Frequency 37-3 k OUTPUT VOLTAGE SWING (V) 8 NOISE VOLTAGE DENSITY (nv/ Hz) k k k LOAD RESISTANCE (Ω) Figure. Output Voltage Swing vs. Load Resistance 37-. k FREQUENCY (Hz) Figure. Noise Voltage Density vs. Frequency 37- Rev. C Page 7 of

8 CURRENT NOISE DENSITY (nv/ Hz) 9 A V = + R L = kω C L = 5pF %.. k FREQUENCY (Hz) Figure 5. Current Noise Density vs. Frequency V ms Figure 7. Large-Signal Transient Response A V = + R L = kω C L = 5pF % mv µs Figure. Small-Signal Transient Response 37- Rev. C Page 8 of

9 THEORY OF OPERATION BATTERY-POWERED APPLICATIONS The OP9 can be operated on a minimum supply voltage of. V, or with dual supplies of ±.8 V, and draws only 9 µa of supply current. In many battery-powered circuits, the OP9 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 OP9, combined with the flat discharge characteristic of the lithium cell, indicates that the OP9 can be operated over the entire useful life of the cell. Figure 8 shows the typical discharge characteristic of a Ah lithium cell powering an OP9, with each amplifier, in turn, driving full output swing into a kω load. LITHIUM SULPHUR DIOXIDE CELL VOLTAGE (V) HOURS Figure 8. Lithium Sulphur Dioxide Cell Discharge Characteristic with OP9 and kω Load 37- INPUT VOLTAGE PROTECTION The OP9 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 V beyond either supply without damaging the amplifier. SINGLE-SUPPLY OUTPUT VOLTAGE RANGE In single-supply operation, the OP9 input and output ranges include ground. This allows true zero-in, zero-out operation. The output stage provides an active pull-down to around.8 V above ground. Below this level, a load resistance of up to MΩ to ground is required to pull the output down to zero. In the region from ground to.8 V, the OP9 has voltage gain equal to the specification in Table. Output current source capability is maintained over the entire voltage range including ground. +5V +5V kω / OP9 A OP37 V 9kΩ 5V Ω kω V IN / OP9 B 5V V V Hz V CHANNEL SEPARATION = log V/ Figure 9. Channel Separation Test Circuit 37-9 Rev. C Page 9 of

10 APPLICATIONS INFORMATION TEMPERATURE TO MA TO ma TRANSMITTER A simple temperature to ma to ma transmitter is shown in Figure. After calibration, the transmitter is accurate to +.5 C over the 5 C to +5 C temperature range. The transmitter operates from 8 V to V with supply rejection better than 3 ppm/v. One half of the OP9 is used to buffer the V TEMP pin while the other half regulates the output current to satisfy the current summation at its noninverting input. I OUT V = ( R + R7) V R R TEMP SET R R R7 R R The change in output current with temperature is the derivative of the following transfer function: VTEMP I (R + R7) OUT = T () T R R From Equation and Equation, 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. () 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. 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 I I T ( T T ) + ma FS OUT = A MIN OPERATING Table 5 shows the values of R that are required for various temperature ranges. Table 5. Temperature Range R (k Ω) C to +7 C C to +85 C. 5 C to +5 C 3 V IN V OUT REF3 V TEMP GND 3 R kω 8 / OP9GP 3 V TEMP R kω R3 kω R5 5kΩ R kω ZERO TRIM V SET 5 R 3kΩ / OP9GP SPAN TRIM R7 5kΩ 7 R8 kω R9 kω N N7 V+ 8V TO V R Ω %, /W I OUT Figure. Temperature to ma to ma Transmitter R L 37- Rev. C Page of

11 VARIABLE SLEW RATE FILTER The circuit shown in Figure 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. A acts as a comparator with its output high or low. Diode D and Diode D clamp the voltage across R3, forcing a constant current to flow in or out of C. R3, C, and A form an integrator with the output of A slewing at a maximum rate of V. V D Maximum slew rate = R3 C R3 C For an input voltage slewing at a rate under this maximum slew rate, the output simply follows the input with A operating in its linear region. R 5kΩ C.µF +5V 8 / A OP9GP 3 R kω LOW OVERHEAD VOLTAGE REFERENCE Figure shows a voltage reference that requires only. V of overhead voltage. As shown, the reference provides a stable.5 V output with a. V to 3 V supply. Output voltage drift is only ppm/ C. Line regulation of the reference is under 5 μv/v with load regulation better than μv/ma with up to 5 ma of output current. The REF3 provides a stable.5 V that is multiplied by the OP9. The PNP output transistor enables the output voltage to approach the supply voltage. Resistor R and Resistor R determine the output voltage. R V OUT =.5 V + R The 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 IN REF3FZ V OUT GND 8 V+ / OP9GP 3 N97A V OUT D D R3 MΩ R 5kΩ 5 / A OP9GP C 7pF 7 V OUT RB Ω -TURN BOURNS 3P-- RA.37Ω % R kω % C µf Figure. Low Overhead Voltage Reference C.µF 37-3 DIODES ARE N8 5V Figure. Variable Slew Rate Filter 37- Rev. C Page of

12 OUTLINE DIMENSIONS. (.).35 (9.7).355 (9.). (5.33) MAX.5 (3.8).3 (3.3).5 (.9). (.5).8 (.). (.3) 8. (.5) BSC 5.8 (7.).5 (.35). (.).5 (.38) MIN SEATING PLANE.5 (.3) MIN. (.5) MAX.5 (.38) GAUGE PLANE.35 (8.).3 (7.87).3 (7.).3 (.9) MAX.95 (.95).3 (3.3).5 (.9). (.3). (.5).8 (.).7 (.78). (.5).5 (.) COMPLIANT TO JEDEC STANDARDS MS- 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. Figure 3. 8-Lead Plastic Dual In-Line Package [PDIP] [P-Suffix] (N-8) Dimensions shown in inches and (millimeters) 7-A ORDERING GUIDE Model V OS Max (mv) Temperature Range Package Description Package Option OP9GP 5 C to +85 C 8-Lead Plastic PDIP P-Suffix (N-8) OP9GPZ 5 C to +85 C 8-Lead Plastic PDIP P-Suffix (N-8) Z = RoHS Compliant Part Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D37--/9(C) Rev. C Page of