OP227

a Dual, Low Noise, Low Offset Instrumentation Operational Amplifier OP227 PIN CONNECTIONS NULL (A) NULL (A) –IN (A) +IN (A) V– (B) OUT (B) V+ (B) 1 2 3 14 13 12 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/M O 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 V+ (A) OUT (A) V– (A) +IN (B) –IN (B) NULL (B) NULL (B) A 4 11 B 5 6 7 10 9 8 NOTE 1. DEVICE MAY BE OPERATED EVEN IF INSERTION IS REVERSED; THIS IS DUE TO INHERENT SYMMETRY OF PIN LOCATIONS OF AMPLIFIERS A AND B 2. V–(A) AND V–(B) ARE INTERNALLY CONNECTED VIA SUBSTRATE RESISTANCE 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 g...