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OP297 Folha de dados(PDF) 1 Page - Analog Devices |
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OP297 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 16 page 8/21/97 4:00 PM REV. D 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a OP297 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 Dual Low Bias Current Precision Operational Amplifier PIN CONNECTIONS Plastic Epoxy-DIP (P Suffix) 8-Pin Cerdip (Z Suffix) 8-Pin Narrow Body SOIC (S Suffix) FEATURES Precision Performance in Standard SO-8 Pinout Low Offset Voltage: 50 V max Low Offset Voltage Drift: 0.6 V/ C max Very Low Bias Current: +25 C (100 pA max) –55 C to +125 C (450 pA max) Very High Open-Loop Gain (2000 V/mV min) Low Supply Current (Per Amplifier): 625 A max Operates From 62 V to 620 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 Gauge 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 GENERAL DESCRIPTION The OP297 is the first dual op amp to pack precision perfor- mance into the space-saving, industry standard 8-pin SO pack- age. Its 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 insuring high linearity in every application. Errors due to common-mode signals are eliminated by the OP297’s common-mode rejection of over 120 dB. The OP297’s power supply rejection of over 120 dB minimizes offset voltage changes experienced in battery powered systems. Supply current of the OP297 is under 625 µA per amplifier and it can operate with supply voltages as low as ±2 V. The OP297 utilizes 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 OP 297 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 instru- mentation amplifiers, log amplifiers, photodiode preamplifiers and long-term integrators. For a single device, see the OP97; for a quad, see the OP497. Figure 1. Low Bias Current Over Temperature Figure 2. Very Low Offset 1 2 3 45 6 7 8 OUT A V+ –IN A OUT B +IN A –IN B V– +IN B – B A TEMPERATURE ( °C) 60 40 20 0 20 –40 –60 –75 –50 –25 0 25 50 75 100 125 VS = ±15V VCM = 0V IB– IB+ IOS INPUT OFFSET VOLTAGE ( µV) 400 300 200 100 0 –100 –80 –60 –40 –20 0 20 40 60 80 100 1200 UNITS TA = +25°C VS = ±15V VCM = 0V |
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