Precision Picoampere Input Current Quad Operational Amplifier OP497 FEATURES PIN CONNECTIONS Low offset voltage: 75 V maximum OUT A 1 16 OUT D Low offset voltage drift: 1.0 V/C maximum IN A 2 15 IN D 3 Very low bias current +IN A 14 +IN D V+ 4 13 V 25C: 150 pA maximum OP497 5 +IN B 12 +IN C 40C to +85C: 300 pA maximum IN B 6 11 IN C Very high open-loop gain: 2000 V/mV minimum OUT B 7 10 OUT C Low supply current (per amplifier): 625 A maximum 8 NC 9 NC Operates from 2 V to 20 V supplies High common-mode rejection: 114 dB minimum NC = NO CONNECT Figure 1. 16-Lead Wide Body SOIC (RW-16) APPLICATIONS OUT A 1 14 OUT D Strain gage and bridge amplifiers IN A 2 13 IN D High stability thermocouple amplifiers 3 +IN A 12 +IN D Instrumentation amplifiers V+ 4 11 V OP497 Photocurrent monitors +IN B 5 10 +IN C High gain linearity amplifiers IN B 6 9 IN C Long-term integrators/filters OUT B 7 8 OUT C Sample-and-hold amplifiers Figure 2. 14-Lead PDIP (N-14) Peak detectors 1k Logarithmic amplifiers V = 15V S V = 0V CM Battery-powered systems GENERAL DESCRIPTION The OP497 is a quad op amp with precision performance in the space-saving, industry standard 16-lead SOlC package. 100 Its combination of exceptional precision with low power and extremely low input bias current makes the quad OP497 useful I B in a wide variety of applications. +I B Precision performance of the OP497 includes very low offset I (<50 V) and low drift (<0.5 V/C). Open-loop gain exceeds OS 10 2000 V/mV ensuring high linearity in every application. Errors 75 50 25 0 25 50 75 100 125 due to common-mode signals are eliminated by its common- TEMPERATURE (C) mode rejection of >120 dB. The OP497 has a power supply Figure 3. Input Bias, Offset Current vs. Temperature rejection of >120 dB which minimizes offset voltage changes Combining precision, low power, and low bias current, the OP497 experienced in battery-powered systems. The supply current is ideal for a number of applications, including instrumentation of the OP497 is <625 A per amplifier, and it can operate with amplifiers, log amplifiers, photodiode preamplifiers, and long- supply voltages as low as 2 V. term integrators. For a single device, see the OP97 data sheet, The OP497 uses a superbeta input stage with bias current and for a dual device, see the OP297 data sheet. cancellation to maintain picoamp bias currents at all temperatures. This is in contrast to FET input op amps whose bias currents start in the picoamp range at 25C but double for every 10C rise in temperature to reach the nanoamp range above 85C. The input bias current of the OP497 is <100 pA at 25C. Rev. E 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 19912009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. INPUT CURRENT (pA) 00309-002 00309-001 00309-003OP497 TABLE OF CONTENTS Features .............................................................................................. 1 AC Performance ......................................................................... 10 Applications ....................................................................................... 1 Guarding And Shielding ........................................................... 11 General Description ......................................................................... 1 Open-Loop Gain Linearity ....................................................... 11 Pin Connections ............................................................................... 1 Applications Circuit ....................................................................... 12 Revision History ............................................................................... 2 Precision Absolute Value Amplifier ......................................... 12 Specif icat ions ..................................................................................... 3 Precision Current Pump ............................................................ 12 Absolute Maximum Ratings ............................................................ 4 Precision Positive Peak Detector .............................................. 12 Thermal Resistance ...................................................................... 4 Simple Bridge Conditioning Amplifier ................................... 12 ESD Caution .................................................................................. 4 Nonlinear Circuits ...................................................................... 13 Typical Performance Characteristics ............................................. 5 Outline Dimensions ....................................................................... 14 Applications Information .............................................................. 10 Ordering Guide .......................................................................... 15 REVISION HISTORY 2/09Rev. D to Rev. E 11/01Rev. C to Rev. D Deleted 14-Lead CERDIP ............................................. Throughout Edits to Pin Connection Headings .................................................. 1 Changes to Features Section and General Description Deleted Wafer Test Limits ................................................................ 3 Section ................................................................................................ 1 Edits to Absolute Maximum Ratings .............................................. 5 Delete Military Processed Devices Text, SMD Part Number, Edits to Outline Dimensions ......................................................... 16 ADI Part Number Table, and Dice Characteristics Figure ......... 3 Edits to Ordering Guide ................................................................ 17 Changes to Table 1 ............................................................................ 3 Changes to Absolute Maximum Ratings Section ......................... 4 Changes to Figure 12 ........................................................................ 6 Changes to Figure 18 and Figure 19 ............................................... 7 Changes to Figure 26 and Figure 28 ............................................... 8 Deleted OP497 Spice Macro-Model Section ............................... 10 Changes to Applications Information Section ............................ 10 Moved Figure 33 ............................................................................. 10 Deleted Table I. OP497 SPICE Net-List....................................... 11 Changes to Open-Loop Gain Linearity Section and Figure 35 .......................................................................................... 11 Changes to Figure 40 ...................................................................... 13 Updated Outline Dimensions ....................................................... 14 Changes to Ordering Guide .......................................................... 15 Rev. E Page 2 of 16