Ultralow Power, Rail-to-Rail Output Operational Amplifiers OP281/OP481 FEATURES PIN CONFIGURATIONS Low supply current: 4 A/amplifier maximum OUT A 1 8 V+ OP281 OUT B Single-supply operation: 2.7 V to 12 V IN A 2 7 TOP VIEW IN B +IN A 3 6 Wide input voltage range (Not to Scale) V 4 5 +IN B Rail-to-rail output swing Low offset voltage: 1.5 mV Figure 1. 8-Lead No phase reversal Narrow-Body SOIC (R Suffix) APPLICATIONS Comparator OUT A 1 8 V+ Battery-powered instrumentation IN A 2 OP281 7 OUT B TOP VIEW Safety monitoring IN B +IN A 3 6 (Not to Scale) Remote sensors 4 +IN B V 5 Low voltage strain gage amplifiers Figure 2. 8-Lead TSSOP GENERAL DESCRIPTION (RU Suffix) The OP281 and OP481 are dual and quad ultralow power 1 14 OUT D OUT A single-supply amplifiers featuring rail-to-rail outputs. Each 2 13 IN D IN A operates from supplies as low as 2.0 V and is specified at +3 V +IN A 3 12 +IN D OP481 4 11 V V+ TOP VIEW and +5 V single supplies as well as 5 V dual supplies. (Not to Scale) 5 10 +IN C +IN B Fabricated on Analog Devices CBCMOS process, the 6 9 IN C IN B OP281/OP481 feature a precision bipolar input and an output 7 8 OUT C OUT B that swings to within millivolts of the supplies, continuing to Figure 3. 14-Lead sink or source current up to a voltage equal to the supply voltage. Narrow-Body SOIC (R Suffix) Applications for these amplifiers include safety monitoring, portable equipment, battery and power supply control, and 1 OUT A 14 OUT D signal conditioning and interfacing for transducers in very low 2 13 IN A IN D power systems. 3 12 +IN A +IN D OP481 TOP VIEW The outputs ability to swing rail-to-rail and not increase supply 4 11 V+ V (Not to Scale) current when the output is driven to a supply voltage enables 5 10 +IN B +IN C the OP281/OP481 to be used as comparators in very low power 6 9 IN B IN C 7 8 systems. This is enhanced by their fast saturation recovery time. OUT B OUT C Propagation delays are 250 s. Figure 4. 14-Lead TSSOP The OP281/OP481 are specified over the extended industrial (RU Suffix) temperature range (40C to +85C). The OP281 dual amplifier is available in 8-lead SOIC surface-mount and TSSOP packages. The OP481 quad amplifier is available in narrow 14-lead SOIC and TSSOP packages. Rev. D 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 19962008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 00291-001 00291-003 00291-002 00291-004OP281/OP481 TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation .................................................................. 13 Applications ....................................................................................... 1 Input Overvoltage Protection ................................................... 13 Pin Configurations ........................................................................... 1 Input Offset Voltage ................................................................... 13 General Description ......................................................................... 1 Input Common-Mode Voltage Range ..................................... 13 Revision History ............................................................................... 2 Capacitive Loading ..................................................................... 14 Specif icat ions ..................................................................................... 3 Micropower Reference Voltage Generator .............................. 14 Electrical Specifications ............................................................... 3 Window Comparator ................................................................. 14 Absolute Maximum Ratings ............................................................ 6 Low-Side Current Monitor ....................................................... 15 Thermal Resistance ...................................................................... 6 Low Voltage Half-Wave and Full-Wave Rectifiers ................. 15 ESD Caution .................................................................................. 6 Battery-Powered Telephone Headset Amplifier ..................... 15 Typical Performance Characteristics ............................................. 7 Outline Dimensions ....................................................................... 17 Applications ..................................................................................... 13 Ordering Guide .......................................................................... 18 REVISION HISTORY 9/08Rev. C to Rev. D 2/03Rev. 0 to Rev. A Changes to Figure 40 ...................................................................... 14 Updated Format .................................................................. Universal Changes to Low-Side Current Monitor Section ......................... 15 Deleted OP181 .................................................................... Universal Changes to Figure 42 ...................................................................... 15 Updated Package Options ................................................. Universal Deleted OP181 Pin Configurations ................................................ 1 10/07Rev. B to Rev. C Deleted Epoxy DIP Pin Configurations ......................................... 1 Updated Format .................................................................. Universal Changes to Absolute Maximum Ratings ........................................ 5 Changes to Offset Voltage Drift Condition .................................. 3 Changes to Ordering Guide ............................................................. 5 Changes to Slew Rate Symbol ......................................................... 5 Changes to Input Offset Voltage ................................................... 10 Changes to Figure 8 .......................................................................... 7 Deleted Former Figure 33 ............................................................. 10 Deleted SPICE Macro-Model Section ......................................... 13 Deleted Overdrive Recovery Time Section ................................. 11 Updated Outline Dimensions ....................................................... 17 Deleted Former Figure 36 ............................................................. 11 Changes to Ordering Guide .......................................................... 18 Deleted 8-Lead and 14-Lead Plastic DIP (N-8 and N-14) 3/03Rev. A to Rev. B Outline Dimensions ....................................................................... 14 Updated Outline Dimensions ....................................................... 14 Changes to Features .......................................................................... 1 Rev. D Page 2 of 20