AD8228ARMZ-RL

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The AD8228ARMZ-RL is an instrumentation amplifier from Analog Devices. It is a single-supply, low-power, low-noise, rail-to-rail output amplifier that can be used in a variety of applications including biasing, data acquisition, biosensing, photodiode amplification, thermocouple conditioning and other instrumentation applications.

The AD8228ARMZ-RL is well-suited for amplifying signals from low-power, low-noise sensors such as photodiodes, thermocouples and strain gauges. It offers rail-to-rail output, small size, low power consumption, and excellent noise and distortion performance.

The device is a unity gain amplifier with a wide range of gains (1 to 10000), making it well-suited for instrumentation applications. It has a programmable gain setting, making it suitable for applications requiring dynamic range adjustment. The input common-mode range covers the power supply rail-to-rail, making it suitable for applications with a wide common-mode voltage range.

The AD8228ARMZ-RL operates with a single supply of 2.7V to 5.5V. It features low-noise, low-power performance and can operate at speeds up to 500 kHz. It has excellent accuracy performance with a gain error of less than 0.5% over temperature and a 0.3% total harmonic distortion (THD) performance. The device is available in an 8-lead SOIC package.

The working principle of the AD8228ARMZ-RL is based on the instrumentation amplifier topology. It consists of two differential amplifiers connected in series and a third differential amplifier connected in parallel with the output of the first two differential amplifiers, as shown in figure 1. The first two differential amplifiers, referred to as the input stage, consist of two input transistors and two feedback resistors. These resistors are used to set the gain of the amplifier. The output of the input stage is then connected to a third differential amplifier, which is used to buffer the output. This output amplifier consists of two input transistors and two matched feedback resistors, which are used to cancel out the effect of the input stage and provide a rail-to-rail output.

The AD8228ARMZ-RL is a versatile amplifier that is well-suited for a variety of instrumentation applications. It has a low power consumption, excellent noise and distortion performance, and is available in a small 8-lead SOIC package. It can be used for amplifying signals from low-power, low-noise sensors and for dynamic range control applications. The device is easy to integrate into existing designs as it can be operated with a single supply.

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