INA118U/2K5

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The INA118U/2K5 is an instrumentation operational amplifier (Op-Amp) designed for use in remote systems and outdoor applications. It is an integrated circuit containing both an inverting and a non-inverting Op-Amp and is capable of driving amplifier stages, buffer stages, and direct-coupled circuits. It also has a low offset voltage, low input bias current, and fast settling time. The INA118U/2K5 is used in applications such as current sensing, transimpedance, high-impedance measurement, isolators, and embedded systems.

The INA118U/2K5’s principle of operation involves using a combined amplifier design consisting of both an inverting and a non-inverting amplifier. Its two stages of amplification can be seen in the waveform diagrams in the data sheet. Both amplifiers use the same differential input, with the non-inverting amplifier having a lower gain than the inverting amplifier. The gain of the non-inverting amplifier is controlled by the amount of feedback resistance connected from its output to its input. The gain of the inverting amplifier is adjusted with a resistor connected from its output to its inverting input. With this design, the combined amplifier gain is a function of the gain of the non-inverting amplifier and the inverting amplifier.

The INA118U/2K5’s common-mode input range is from -2.2V to 7V, and its input bias current is typically lower than 6nA. It also has low offset voltage and fast settling time making it ideal for use in remote systems and outdoor applications. The INA118U/2K5 also has an offset cancellation feature which minimizes error due to DC offsets. It has input overvoltage protection, reverse-voltage protection, and power-on reset protection to prevent damage caused by voltage or current transients.

The INA118U/2K5 is most commonly used in current sensing applications such as current transducers and current monitors. It can also be used in remote systems and outdoor applications to measure and control electrical parameters like current and voltage. In applications such as embedded systems, the INA118U/2K5 can be used to provide isolation and buffer between different stages of a circuit. In isolator applications, it can provide electrical isolation for sensitive signals, which can significantly reduce noise and prevent damage to sensitive components.

In summary, the INA118U/2K5 is a dual-stage instrumentation Amplifier designed for use in current sensing, transimpedance, high-impedance measurement, isolators and embedded systems. It has a low offset voltage, low input bias current, and fast settling time making it suitable for remote systems and outdoor applications. Its two amplifiers use the same differential input, with the non-inverting amplifier having a lower gain than the inverting amplifier. The gain of both amplifiers can be adjusted using external resistors. It also has overvoltage protection and power-on reset protection to prevent damage caused by voltage and current transients. This makes it an ideal amplifier for use in applications requiring high accuracy and reliability.

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