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OP227GY bảng dữ liệu(PDF) 1 Page - Analog Devices |
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OP227GY bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 16 page REV. A 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. a OP227 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 © Analog Devices, Inc., 2002 Dual, Low Noise, Low Offset Instrumentation Operational Amplifier PIN CONNECTIONS NOTE DEVICE MAY BE OPERATED EVEN IF INSERTION IS REVERSED; THIS IS DUE TO INHERENT SYMMETRY OF PIN LOCATIONS OF AMPLIFIERS A AND B V–(A) AND V–(B) ARE INTERNALLY CONNECTED VIA SUBSTRATE RESISTANCE 1. 2. NULL (A) NULL (A) –IN (A) +IN (A) V– (B) OUT (B) V+ (B) 1 V+ (A) OUT (A) V– (A) +IN (B) –IN (B) NULL (B) NULL (B) A B 2 3 4 5 6 7 14 13 12 11 10 9 8 FEATURES Excellent Individual Amplifier Parameters Low VOS, 80 V Max Offset Voltage Match, 80 V Max Offset Voltage Match vs. Temperature, 1 V/ C Max Stable VOS vs. Time, 1 V/MO Max Low Voltage Noise, 3.9 nV/ ÷Hz Max Fast, 2.8 V/ s Typ High Gain, 1.8 Million Typ High Channel Separation, 154 dB Typ GENERAL DESCRIPTION The OP227 is the first dual amplifier to offer a combination of low offset, low noise, high speed, and guaranteed amplifier matching characteristics in one device. The OP227, with a VOS match of 25 mV typical, a TCVOS match of 0.3 mV/∞C typical and a 1/f corner of only 2.7 Hz is an excellent choice for precision low noise designs. These dc characteristics, coupled with a slew rate of 2.8 V/ ms typical and a small-signal bandwidth of 8 MHz typical, allow the designer to achieve ac performance previously unattainable with op amp based instrumentation designs. When used in a three op amp instrumentation configuration, the OP227 can achieve a CMRR in excess of 100 dB at 10 kHz. In addition, this device has an open-loop gain of 1.5 M typical with a 1 k W load. The OP227 also features an IB of ±10 nA typical, an IOS of 7 nA typical, and guaranteed matching of input currents SIMPLIFIED SCHEMATIC NON INVERTING INPUT (+) INVERTING INPUT (–) Q3 Q6 Q1A Q1B Q2B Q2A R1* R3 NULL R4 R2* *R1 AND R2 ARE PREMATURELY ADJUSTED AT WAFER TEST FOR MINIMUM OFFSET VOLTAGE. Q21 Q11 Q12 Q27 C2 Q23 Q24 R23 R24 Q28 R5 C3 R11 C4 R12 R9 Q22 C1 Q20 Q19 Q26 Q45 Q46 OUTPUT V- V+ between amplifiers. These outstanding input current specifications are realized through the use of a unique input current cancellation circuit which typically holds IB and IOS to ±20 nA and 15 nA respectively over the full military temperature range. Other sources of input referred errors, such as PSRR and CMRR, are reduced by factors in excess of 120 dB for the individual amplifiers. DC stability is assured by a long-term drift application of 1.0 mV/month. Matching between channels is provided on all critical param- eters including offset voltage, tracking of offset voltage versus temperature, noninverting bias current, CMRR, and power supply rejection ratio. This unique dual amplifier allows the elimination of external components for offset nulling and frequency compensation. |
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