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OP297FS-REEL Datasheet(PDF) 1 Page - Analog Devices |
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OP297FS-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page 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. 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 companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. OP297 Dual Low Bias Current Precision Operational Amplifier FEATURES Low Offset Voltage: 50 V Max Low Offset Voltage Drift: 0.6 V/ C Max Very Low Bias Current: 100 pA Max Very High Open-Loop Gain: 2000 V/mV Min Low Supply Current (Per Amplifier): 625 A Max Operates From 2 V to 20 V Supplies High Common-Mode Rejection: 120 dB Min Pin Compatible to LT1013, AD706, AD708, OP221, LM158, and MC1458/1558 with Improved Performance APPLICATIONS Strain Gage and Bridge Amplifiers High Stability Thermocouple Amplifiers Instrumentation Amplifiers Photo-Current Monitors High Gain Linearity Amplifiers Long-Term Integrators/Filters Sample-and-Hold Amplifiers Peak Detectors Logarithmic Amplifiers Battery-Powered Systems PIN CONNECTIONS 8 7 6 5 1 2 3 4 OUTA –INA +INA V+ OUTB –INB +INB V– B A GENERAL DESCRIPTION The OP297 is the first dual op amp to pack precision performance into the space-saving, industry-standard, 8-lead SOIC package. Its combination of precision with low power and extremely low input bias current makes the dual OP297 useful in a wide variety of applications. TEMPERATURE ( C) 60 –60 –75 –50 125 –25 0 25 50 75 100 40 20 0 –20 –40 IB– IB+ IOS VS = 15V VCM = 0V Figure 1. Low Bias Current over Temperature Precision performance of the OP297 includes very low offset, under 50 µV, and low drift, below 0.6 µV/°C. Open-loop gain exceeds 2000 V/mV, ensuring high linearity in every application. Errors due to common-mode signals are eliminated by the OP297’s common-mode rejection of over 120 dB, which mini- mizes offset voltage changes experienced in battery-powered systems. Supply current of the OP297 is under 625 µA per amplifier, and the part can operate with supply voltages as low as ±2 V. The OP297 uses a super-beta 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. Input bias current of the OP297 is under 100 pA at 25 °C and is under 450 pA over the military temperature range. Combining precision, low power, and low bias current, the OP297 is ideal for a number of applications, including instrumentation amplifiers, log amplifiers, photodiode preamplifiers, and long- term integrators. For a single device, see the OP97; for a quad, see the OP497. INPUT OFFSET VOLTAGE ( V) 400 0 –100 –80 60 –60 –40 –20 0 20 40 300 200 100 80 100 TA = 25 C VS = 15V VCM = 0V 1200 UNITS Figure 2. Very Low Offset |
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