OPA228P

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An operational amplifier (op amp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. An op amp produces an output potential (relative to circuit ground) that is typically hundreds of thousands of times larger than the potential difference between the inverting and non-inverting inputs. This feature makes them ideal for use as amplifiers in wide-ranging applications requiring high-gain, closed-loop operation and high-accuracy signal transfer. The OPA228P is a versatile, low power, monolithic operational amplifier offering excellent performance over a wide range of frequencies, making it ideal for many applications.

The OPA228P is a single-supply, low power amplifier that provides a DC gain of 100 dB, with a -3 dB frequency of 5 MHz and a -0.1 dB frequency of 17 MHz. It operates on a single 5V supply and its low quiescent current of 100 uA make it ideal for battery-powered applications. The chip is easy to use with a wide supply voltage range from 2.5V to 16V and can also run from a single 3V supply. It has very good input offset voltage, drift and power supply rejection, resulting in very low error over a wide range of temperatures and supplies.

The OPA228P is mainly used in instrumentation, buffer amplifiers, and linear amplification circuits. Its input and output impedance is high, making it suitable for driving wide dynamic range loads, such as high bit ADC’s, DAC’s and LCD display drivers. Its fast slew rate of 12V/us, over-temperature thermal shutdown, low noise and low distortion make it perfect for use in energy management, communications, automotive, industrial, and instrumentation systems.

The OPA228P has a differential amplifier configuration with three stages: an input stage, a unity-gain main stage, and an output gain stage. Each stage has a distinct purpose. The input stage amplifies the input signals and provides a DC path to the input so that the ac signals can be amplified directly. The unity-gain stage serves as an impedance transforming point, and passes on the input signal to the output gain stage. The output gain stage provides the output signal with the desired gain. The overall gain of the amplifier system is determined by the gain stage.

The basic circuit diagram of the OPA228P is shown asFigure 1. The voltage output of the OPA228P is set by two resistors, R1 and R2, connected to the non-inverting and inverting input terminals. The two input resistors and a feedback resistor, Rf, determine the gain of the amplifier. The output stage of the op amp includes an output amplifier, which increases gain, and an error amplifier to control loop compensation.

The OPA228P is an excellent and versatile amplifier for a wide range of portable, battery-powered and industrial applications. Its low input and output impedance, low distortion, good temperature stability, and high gain make it an ideal choice for digital signal processing, medical instrumentation, and instrumentation applications. Its wide operating temperature range and fast settle time allow for rapid and precise adjustment of gain. The device also exhibits good ESD protection, making it suitable for use in high-noise environments.

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