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LM101A/LM201A/LM301A OperaTIonal Amplifiers General DescripTIonThe LM101A series are general purpose operaTIonal amplifierswhich feature improved performance over industry standardslike the LM709. Advanced processing techniquesmake possible an order of magnitude reducTIon in inputcurrents, and a redesign of the biasing circuitry reduces thetemperature drift of input current. Improved specificationsinclude:• Offset voltage 3 mV maximum over temperature(LM101A/LM201A)• Input current 100 nA maximum over temperature(LM101A/LM201A)• Offset current 20 nA maximum over temperature(LM101A/LM201A)• Guaranteed drift characteristics• Offsets guaranteed over entire common mode and supplyvoltage ranges• Slew rate of 10V/μs as a summing amplifierThis amplifier offers many features which make its applicationnearly foolproof: overload protection on the inputand output, no latch-up when the common mode range isexceeded, and freedom from oscillations and compensationwith a single 30 pF capacitor. It has advantages overinternally compensated amplifiers in that the frequencycompensation can be tailored to the particular application.For example, in low frequency circuits it can beovercompensated for increased stability margin. Or thecompensation can be optimized to give more than afactor of ten improvement in high frequency performancefor most applications.In addition, the device provides better accuracy andlower noise in high impedance circuitry. The low inputcurrents also make it particularly well suited for longinterval integrators or timers, sample and hold circuitsand low frequency waveform generators. Further, replacingcircuits where matched transistor pairs buffer theinputs of conventional IC op amps, it can give lower offsetvoltage and a drift at a lower cost.The LM101A is guaranteed over a temperature range of−55°C to +125°C, the LM201A from −25°C to +85°C, andthe LM301A from 0°C to +70°C.
