OP281GRU-REEL

Ultralow Power, Rail-to-Rail Output Operational Amplifiers OP281/OP481 FEATURES Low supply current: 4 μA/amplifier maximum Single-supply operation: 2.7 V to 12 V Wide input voltage range Rail-to-rail output swing Low offset voltage: 1.5 mV No phase reversal PIN CONFIGURATIONS OUT A 1 –IN A 2 8 V+ APPLICATIONS Comparator Battery-powered instrumentation Safety monitoring Remote sensors Low voltage strain gage amplifiers OUT A –IN A +IN A V– 1 Figure 1. 8-Lead Narrow-Body SOIC (R Suffix) 8 V+ OUT B –IN B +IN B 00291-002 2 3 4 OP281 TOP VIEW (Not to Scale) 7 6 5 GENERAL DESCRIPTION The OP281 and OP481 are dual and quad ultralow power single-supply amplifiers featuring rail-to-rail outputs. Each operates from supplies as low as 2.0 V and is specified at +3 V and +5 V single supplies as well as ±5 V dual supplies. Fabricated on Analog Devices’ CBCMOS process, the OP281/OP481 feature a precision bipolar input and an output that swings to within millivolts of the supplies, continuing to sink or source current up to a voltage equal to the supply voltage. Applications for these amplifiers include safety monitoring, portable equipment, battery and power supply control, and signal conditioning and interfacing for transducers in very low power systems. The output’s ability to swing rail-to-rail and not increase supply current when the output is driven to a supply voltage enables the OP281/OP481 to be used as comparators in very low power systems. This is enhanced by their fast saturation recovery time. Propagation delays are 250 μs. The OP281/OP481 are specified over the extended industrial temperature range (−40°C to +85°C). 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. Figure 2. 8-Lead TSSOP (RU Suffix) OUT A 1 –IN A 2 +IN A 3 V+ 4 14 OUT D 13 –IN D OP481 12 +IN D 11 V– TOP VIEW (Not to Scale) 10 +IN C +IN B 5 00291-003 00291-004 –IN B 6 OUT B 7 9 8 –IN C OUT C Figure 3. 14-Lead Narrow-Body SOIC (R Suffix) OUT A –IN A +IN A V+ +IN B –IN B OUT B 1 2 3 4 5 6 7 14 OUT D 13 –IN D 12 +IN D OP481 TOP VIEW 11 V– (Not to Scale) 10 +IN C 9 8 –IN C OUT C Figure 4. 14-Lead TSSOP (RU Suffix) 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. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©1996–2007 Analog Devices, Inc. All rights reserved. 00291-001 OUT B TOP VIEW +IN A 3 (Not to Scale) 6 –IN B 5 +IN B V– 4 7 OP281 OP281/OP481 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Specifications............................................................... 3 Absolute Maximum Ratings............................................................ 6 Thermal Resistance ...................................................................... 6 ESD Caution.................................................................................. 6 Typical Performance Characteristics ............................................. 7 Applications..................................................................................... 13 Theory of Operation .................................................................. 13 Input Overvoltage Protection ................................................... 13 Input Offset Voltage ................................................................... 13 Input Common-Mode Voltage Range ..................................... 13 Capacitive Loading..................................................................... 14 Micropower Reference Voltage Generator.............................. 14 Window Comparator................................................................. 14 Low-Side Current Monitor ....................................................... 15 Low Voltage Half-Wave and Full-Wave Rectifiers................. 15 Battery-Powered Telephone Headset Amplifier..................... 15 Outline Dimensions ....................................................................... 17 Ordering Guide .......................................................................... 18 REVISION HISTORY 10/07—Rev. B to Rev. C Updated Format..................................................................Universal Changes to Offset Voltage Drift Condition .................................. 3 Changes to Slew Rate Symbol ......................................................... 5 Changes to Figure 8.......................................................................... 7 Deleted SPICE Macro-Model Section ......................................... 13 Updated Outline Dimensions ....................................................... 17 Changes to Ordering Guide .......................................................... 18 3/03—Rev. A to Rev. B Changes to Features.......................................................................... 1 2/03—Rev. 0 to Rev. A Updated Format..................................................................Universal Deleted OP181 ....................................................................Universal Updated Package Options .................................................Universal Deleted OP181 Pin Configurations ................................................1 Deleted Epoxy DIP Pin Configurations .........................................1 Changes to Absolute Maximum Ratings........................................5 Changes to Ordering Guide .............................................................5 Changes to Input Offset Voltage................................................... 10 Deleted Former Figure 33 ............................................................. 10 Deleted Overdrive Recovery Time Section................................. 11 Deleted Former Figure 36 ............................................................. 11 Deleted 8-Lead and 14-Lead Plastic DIP (N-8 and N-14) Outline Dimensions ....................................................................... 14 Updated Outline Dimensions....................................................... 14 Rev. C | Page 2 of 20 OP281/OP481 SPECIFICATIONS ELECTRICAL SPECIFICATIONS VS = 3.0 V, VCM = 1.5 V, TA = 25°C, unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage 1 Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large-Signal Voltage Gain Offset Voltage Drift Bias Current Drift Offset Current Drift OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Limit POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Turn-On Time Saturation Recovery Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density 1 Symbol VOS IB IOS CMRR AVO ΔVOS/∆T ΔIB/ΔT ΔIOS/ΔT VOH VOL ISC PSRR ISY Condition Min Typ Max 1.5 2.5 10 7 2 Unit mV mV nA nA V dB V/mV V/mV μV/°C pA/°C pA/°C V mV mA dB μA μA V/ms μs μs μs kHz Degrees μV p-p nV/√Hz pA/√Hz −40°C ≤ TA ≤ +85°C −40°C ≤ TA ≤ +85°C −40°C ≤ TA ≤ +85°C VCM = 0 V to 2.0 V, −40°C ≤ TA ≤ +85°C RL = 1 MΩ, VO = 0.3 V to 2.7 V −40°C ≤ TA ≤ +85°C −40°C to +85°C 0 65 5 2 3 0.1 95 13 10 20 2 2.925 2.96 25 ±1.1 95 3 RL = 100 kΩ to GND, −40°C ≤ TA ≤ +85°C RL = 100 kΩ to V+, −40°C ≤ TA ≤ +85°C 75 VS = 2.7 V to 12 V, −40°C ≤ TA ≤ +85°C VO = 0 V −40°C ≤ TA ≤ +85°C RL = 100 kΩ, CL = 50 pF AV = 1, VO = 1 V AV = 20, VO = 1 V 76 4 5 SR GBP φM en p-p en in 0.1 Hz to 10 Hz f = 1 kHz 25 40 50 65 95 70 10 75