OPA228UA

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OPA228UA is an instrumentation amplifier (IA) manufactured by Texas Instruments. It is specially designed for low-noise systems applications with a gain of up to 8 V/V. The amplifier features low offset voltage, low input bias current and low noise to ensure satisfactory performance in diverse low-level signal measurement systems. In addition, OPA228UA offers greater flexibility in configuring gains than fixed-gain IA parts, making it suitable for a wide range of instrumentation, control and data acquisition applications.

Opa228UA application field is the ideal solution for low-noise systems such as sensor output scaling and conditioning, AC and DC signal buffering, differential sensing and embedded control systems. It provides reliable operation in a wide range of industrial, automotive and scientific instrumentation systems. It can also be used for audio and communication applications.

The OPA228UA instrumentation amplifier is based on the classic three-op-amp configuration. It comprises two identical op amps, a feedback amplifier and a differential input stage. It is configured in an inverting gain configuration, with the feedback amplifier acting as the reference voltage. The output voltage is proportional to the input voltage multiplied by the gain of the inverting amplifier. The gain of the amplifier is set using an external resistor, and its wide range allows for a wide range of gains.

The OPA228UA IA features bipolar operation with a low offset voltage of less than 50 µV, a wide supply range (±2.7 V to ±18 V) and low input bias current of only 1 nA. It has a high-speed slew rate of 75 V/µs and a maximum voltage swing of ±20 V. Its wide bandwidth allows for accura rate and reliable operation in a wide range of frequencies, enabling it to operate well in high-speed instrumentation systems.

The OPA228UA also offers low-noise performance with a low integrated noise of only 50 nV/√Hz. This low noise performance allows for reliable operation in noise-sensitive systems such as data acquisition and audio. Additionally, the part is designed for excellent common-mode rejection ratio (CMRR) and power supply rejection ratio (PSR) with high-frequency stability.

In summary, OPA228UA is a versatile instrumentation amplifier with excellent characteristics such as low offset voltage, high bandwidth and low noise, making it the ideal choice for a wide range of low-noise, low-level signal measurement and conditioning systems. Additionally, it provides reliable performance in a wide range of frequencies, making it suitable for high-speed instrumentation applications.

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