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OP497F

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Precision Picoampere Input Current Quad Operational Amplifier OP497 FEATURES PIN CONNECTIONS Low offset voltage: 75 μV maximum Low offset voltage drift: 1.0 μV/°C maximum Very low bias current 25°C: 150 pA maximum −40°C to +85°C: 300 pA maximum Very high open-loop gain: 2000 V/mV minimum Low supply current (per amplifier): 625 μA maximum Operates from ±2 V to ±20 V supplies High common-mode rejection: 114 dB minimum 1 16 OUT D –IN A 2 15 –IN D +IN A 3 14 +IN D V+ 4 13 V– +IN B 5 12 +IN C –IN B 6 11 –IN C OUT B 7 10 OUT C NC 8 9 NC OP497 00309-001 OUT A NC = NO CONNECT Figure 1. 16-Lead Wide Body SOIC (RW-16) OUT A Precision performance of the OP497 includes very low offset (<50 μV) and low drift (<0.5 μV/°C). Open-loop gain exceeds 2000 V/mV ensuring high linearity in every application. Errors due to common-mode signals are eliminated by its commonmode rejection of >120 dB. The OP497 has a power supply rejection of >120 dB which minimizes offset voltage changes experienced in battery-powered systems. The supply current of the OP497 is <625 μA per amplifier, and it can operate with supply voltages as low as ±2 V. The OP497 uses a superbeta input stage with bias current 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 25°C but double for every 10°C rise in temperature to reach the nanoamp range above 85°C. The input bias current of the OP497 is <100 pA at 25°C. OUT D 13 –IN D 3 12 +IN D V+ 4 11 V– +IN B 5 10 +IN C –IN B 6 9 –IN C OUT B 7 8 OUT C OP497 Figure 2. 14-Lead PDIP (N-14) 1k VS = ±15V VCM = 0V 100 –IB +IB IOS 10 –75 –50 –25 0 25 50 75 100 TEMPERATURE (°C) 125 00309-003 The OP497 is a quad op amp with precision performance in the space-saving, industry standard 16-lead SOlC package. Its combination of exceptional precision with low power and extremely low input bias current makes the quad OP497 useful in a wide variety of applications. 14 2 +IN A INPUT CURRENT (pA) GENERAL DESCRIPTION 1 –IN A Strain gage and bridge amplifiers High stability thermocouple amplifiers Instrumentation amplifiers Photocurrent monitors High gain linearity amplifiers Long-term integrators/filters Sample-and-hold amplifiers Peak detectors Logarithmic amplifiers Battery-powered systems 00309-002 APPLICATIONS Figure 3. Input Bias, Offset Current vs. Temperature Combining precision, low power, and low bias current, the OP497 is ideal for a number of applications, including instrumentation amplifiers, log amplifiers, photodiode preamplifiers, and longterm integrators. For a single device, see the OP97 data sheet, and for a dual device, see the OP297 data sheet. 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 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 ©1991–2009 Analog Devices, Inc. All rights reserved.

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