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INA128PAG4 Application Field and Working Principle

Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

The INA128PAG4 instrumentation amplifier is a high-precision, low-noise, high common-mode rejection op-amp ideal for a wide range of applications. It is a three-op-amp instrumentation amplifier with a gain range of 0 to 120 dB and an offset voltage range from 0 to 3V. It features a low input bias current, low input offset voltage, and a wide bandwidth up to 5 MHz.

The INA128PAG4 instrumentation amplifier is most commonly used in medical instrumentation applications. It is also used in analog-to-digital (ADC) and digital-to-analog (DAC) circuits, audio signal processing, high-quality audio applications, transducer bridges, artificial intelligence circuits, and industrial controllers.

The INA128PAG4 instrumentation amplifier offers excellent gain accuracy with a gain accuracy of 0.1%. Its wide bandwidth of 5 MHz enables it to keep up with fast-changing signals, making it a suitable choice for data measurements in high frequency circuits. As well, its high common-mode rejection ratio (CMRR) of 120 dB allows it to ignore unwanted noise signals.

The INA128PAG4 instrumentation amplifier works on a simple principle. It consists of three op amps, each with its own gain that can be adjusted independently. The first op amp acts as a buffer, and is used to EQ the input signals by providing a constant source impedance. The second and third op amps are connected together, in a differential configuration, and are used to compute the output signal, taking care to reject any noise signals. This signal is then converted to an output voltage.

In conclusion, the INA128PAG4 instrumentation amplifier is a versatile and reliable device ideal for a range of applications, including medical instruments and audio signal processing. It provides excellent gain accuracy, a wide bandwidth and a high common-mode rejection ratio, making it ideal for high-accuracy, noise-free signal processing.

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