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Operational Amplifiers

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About Operational Amplifiers

Operational amplifiers (op amps, op-amps) are general-purpose, closed-loop devices that are used to implement linear functions. They compare two incoming signals and release a third signal that is an amplified measure of the difference between the two. Operational amplifiers are used in signal processing circuits, control circuits, and instrumentation for automotive, commercial, industrial, medical and military applications. Input impedance and output impedance vary by op-amp application. For example, in audio applications, the input impedance is usually several times higher than the output impedance. In video and high frequency systems, the impedance of inputs, transmission lines, and outputs are designed to be the same.  

Operational amplifiers (op amps, op-amps) differ in terms of performance specifications and features. Examples include minimum closed-loop gain (AVCL), supply voltage (VS), source current (IS), input offset voltage (VOS), input bias current (IBIAS), and quiescent current (IQ). When selecting operational amplifiers, designers should also consider common mode rejection ratio (CMRR), power supply rejection ratio (PSRR), gain-bandwidth product (GBW), slew rate (SR), input voltage noise (Vn), input current noise (In), and output voltage swing (VOM). Bandwidth and operating temperature are also important considerations. Features for operational amplifiers include rail-to-rail input, rail-to-rail output, single supply, thermal shutdown protection, and on-chip electrostatic discharge (ESD) protection.  

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Engineering Web: Operational Amplifiers

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Operational amplifiers NE5232D - Matched dual high-performance low-voltage operational amplifier NE5232N - Matched dual high-performance low-voltage
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Part Numbers for Operational Amplifiers

Part # Distributor Manufacturer Product Category Description
LM2904DGKR Texas Instruments - Logic Products Texas Instruments Electronic Components, Integrated Circuits DUAL OPERATIONAL AMPLIFIERS
LM2904DRG4 Texas Instruments - Logic Products Texas Instruments Electronic Components, Integrated Circuits DUAL OPERATIONAL AMPLIFIERS
LM2904P Texas Instruments - Logic Products Texas Instruments Electronic Components, Integrated Circuits DUAL OPERATIONAL AMPLIFIERS
LM2904PSR Texas Instruments - Logic Products Texas Instruments Electronic Components, Integrated Circuits DUAL OPERATIONAL AMPLIFIERS
LM2904PWRG4 Texas Instruments - Logic Products Texas Instruments Electronic Components, Integrated Circuits DUAL OPERATIONAL AMPLIFIERS

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