AD8421ARMZ-RL

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The AD8421ARMZ-RL is a low noise and wide supply range CMOS instrumentation amplifier with rail-to-rail output capability. It is designed to provide a stable gain with excellent accuracy, high common-mode rejection, low noise and low total power consumption. This device is well-suited for battery-powered applications, gyroscopes and capacitive sensors, as well as many low frequency, low voltage industrial applications.

The AD8421ARMZ-RL is a member of the family of instrumentation amplifiers (IAs), which are used to amplify small signals that are similar to those found in measuring instruments and other industrial applications. IAs are characterized by high input impedance, high gain accuracy, high common-mode rejection, and wide bandwidth. In addition, many IAs offer low noise, low-power consumption, and rail-to-rail output.

Application Field

The AD8421ARMZ-RL is designed for battery-powered applications, gyroscopes and capacitive sensors, as well as many low-frequency, low-voltage industrial applications. It can be used in medical device applications, and it is suitable for monitoring sensors over a wide range of supply voltages, from 2.7V to 16V. Some of the most common applications for the AD8421ARMZ-RL include:

• Analog filter and signal conditioning
• Medical device applications
• Displacement sensors
• Robotics and vibration sensors
• Biomedical diagnostics
• Industrial process control
• Network communications
• Temperature and strain sensors

Working Principle

At the heart of the AD8421ARMZ-RL is a voltage-feedback IA, which is based on the popular topology that was originally developed by Bell Laboratories in the early days of instrumentation amplification. This type of IA has two differential inputs and one differential output. The input signals, referred to as “non-inverting” and “inverting”, are applied to the amplifier’s input terminals. The gain of the IA is determined by the ratio of the feedback resistance to the non-inverting input resistance. The differential outputs of the IA are amplified with the gain set by the feedback resistance and then converted to a single-ended signal. The output signal is limited to a range of 0V to the power-supply voltage, typically about 16V.

The AD8421ARMZ-RL features low noise and wide supply range CMOS technology, which enables it to maintain good accuracy and stability over temperature and long-term use. The device also provides high common-mode rejection, low power consumption, and fast settling time. In addition, the AD8421ARMZ-RL is protected against input and output overloads, and it is designed for single-ended power supplies.

The AD8421ARMZ-RL is an ideal solution for many low frequency, low voltage industrial applications, and its excellent accuracy, high common-mode rejection, low noise, and low total power consumption make it a great choice for battery-powered applications, gyroscopes and capacitive sensors.

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