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OP297 Arkusz danych(PDF) 1 Page - Analog Devices |
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OP297 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 16 page Dual Lo w Bias Current Precision Operational Amplifier OP297 Rev. F Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Low offset voltage: 50 μV maximum Low offset voltage drift: 0.6 μV/°C maximum Very low bias current: 100 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: 120 dB minimum APPLICATIONS 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 GENERAL DESCRIPTION The OP297 is the first dual op amp to pack precision perform- ance into the space saving, industry-standard 8-lead SOIC package. The combination of precision with low power and extremely low input bias current makes the dual OP297 useful in a wide variety of applications. 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 common-mode rejection of over 120 dB, which minimizes offset voltage changes experienced in battery-powered systems. The supply current of the OP297 is under 625 μA. The OP297 uses a super-beta input stage with bias current cancellation to maintain picoamp bias currents at all tempera- tures. 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 per amplifier. This part can operate with supply voltages as low as ±2 V. PIN CONFIGURATION 8 7 6 5 1 2 3 4 OUTA –INA +INA V+ OUTB –INB +INB V– B A Figure 1. TEMPERATURE (°C) 60 –60 40 20 0 –20 –40 –75 –50 –25 0 25 50 75 100 125 IOS IB+ IB– VS = ±15V VCM = 0V Figure 2. Low Bias Current over Temperature INPUT OFFSET VOLTAGE (µV) 400 0 300 200 100 1200 UNITS –100 –80 –60 –40 –20 0 20 40 60 80 100 TA = 25°C VS = ±15V VCM = 0V Figure 3. Very Low Offset Combining precision, low power, and low bias current, the OP297 is ideal for a number of applications, including instru- mentation amplifiers, log amplifiers, photodiode preamplifiers, and long term integrators. For a single device, see the OP97; for a quad device, see the OP497. |
Podobny numer części - OP297_06 |
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Podobny opis - OP297_06 |
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