OPA4872IDG4

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The OPA4872IDG4 is designed for use in precision amplifier and similar applications. It is a four-channel operational amplifier integrated circuit that is optimized for operation over a wide range of gains, with low noise, low input bias currents and low supply currents. It is specialised for interface applications and can be used to bridge connections between analogue and digital signals, providing a level of precision and accuracy that is hard to achieve with discrete components. The OPA4872IDG4 is well suited for electro-mechanical systems such as motion control, robotics, automotive systems, medical instrumentation and educational equipment.

The OPA4872IDG4 features four low-power, low-offset, JFET-input operational amplifiers. It is pin-compatible with the prior OPA4872 family and provides an improvement in noise performance and a reduction in power consumption of up to 25%. It operates on a single +2.7V to +7V power supply consuming a maximum of 1mA of quiescent current and features rail-to-rail inputs, wide supply operating range, low input offset and bias current.

The OPA4872IDG4 provides excellent low-noise performance with a typical noise voltage of 18nV/√Hz at gain of greater than 1, and a typical noise current of 30pA/√Hz, making it ideal for high-precision applications in medical, industrial and aerospace systems. It also offers a stable gain bandwidth of 3MHz and provides excellent input common-mode rejection and output swing. The OPA4872IDG4 also boasts high accuracy, as it is factory calibrated to ensure accuracy at specified gains.

The internal circuit of the OPA4872IDG4 is a four-stage amplifier consisting of input, gain, output and feedback stages. The input stage, which comprises a series of resistors, is designed to provide high input impedance and low input bias current. The gain stage, which is the crux of the operational amplifier, is situated in between the two stages and features two gain elements. The gain elements are designed to precisely control the output voltage from the operational amplifier. The output stage consists of a robust driver that is optimized to deliver a low-impedance output signal.

The feedback stage of the OPA4872IDG4 plays an important role in maintaining the desired gain and output voltage. It consists of a feedback element and a series of feedback resistors, as well as a compensation capacitor, which is used to improve the stability of the circuit. At the same time, the feedback resistor determines the gain of the circuit and the feedback capacitor helps to reduce the effects of noise and maintain a lower distortion level, making the OPA4872IDG4 a great choice for high-precision and high-stability applications.

The OPA4872IDG4 is a feature-packed, low-power and highly efficient operational amplifier, making it ideal for high-precision amplifier systems, high-speed and high-accuracy data acquisition systems, and other interface applications. It provides excellent low-noise performance, rail-to-rail inputs, wide supply operating range, low-power consumption and a high gain-bandwidth that make it well-suited for a range of precision applications.

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