INA122UA

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INA122UA Application Field and Working Principle

INA122UA is a monolithic instrumentation amplifier categorized under Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps. It is ideal for any application that requires wide bandwidths, low input bias currents and high common-mode rejection. With its large DC precision and wide supply ranges, INA122UA is the most preferred choice for high precision, low noise operations.

Features

• Low power requirements of 1.45V
• Wide bandwidth (3KHz – 1.3MHz) and high common-mode rejection
• Low input bias currents and low offset voltage
• Low output resistance of 15 kΩ maximum
• Internal adjustable gain selector

Applications

• High gain AC/DC current sensing
• High impedance sensing
• Strain gauge instrumentation
• Low frequency counter monitoring
• Data acquisition systems
• Industrial process control
• Medical electronics

Benefits

INA122UA provides low distortion and low noise, making it an ideal choice for precision instrumentation amplifiers. This device also consumes low power requirements, making it suitable for applications that require minimal power consumption, without compromising on performance. It also features an internal adjustable gain selector, providing flexibility in adjusting the gain settings. With its low output resistance and wide input range, INA122UA is the most reliable choice for instrumentation applications.

Working Principle

The INA122UA is an instrumentation amplifier based on a two-stage connection, which allows for a low output impedance and high common-mode rejection ratio (CMRR). The differential input stage consists of two matched pairs of transistors, with a voltage follower to supply a low output resistance for high common-mode rejection. The gain selectable first stage is based on an amplifier with two sets of transistors, one used to set the overall gain and the other one to set the offset. The gain from the first stage is then fed into the second stage, an amplifier with a low-pass filter for the frequency response.

The output of the second stage is fed into a low-pass filter to limit the higher frequencies which can be adjusted with the gain selection. The output voltage is then integrated with a low-drift op-amp, eliminating any potential voltage drift. This allows the INA122UA to have low offset voltage and a low-noise output. The output of the op-amp is then fed back to the differential input stage, completing the loop necessary for the amplifier to have a low offset voltage and low input bias current.

The INA122UA is widely used for precision instrumentation applications. It will provide the user with a low noise and distortion output, with low power consumption and wide bandwidth for wide range of applications. With its low input bias currents and low offset voltage, the INA122UA is highly suitable for high precision, low noise operations.

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