LMV921M7X

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LMV921M7X Application Field and Working Principle

The LMV921M7X family of amplifiers are instrumentation amplifiers featuring rail-to-rail output and exceptional accuracy over temperature. This rail-to-rail capability means that the output of the LMV921M7X can swing within 0 V and the supply voltage, making it an ideal choice for applications that require high resolution across the full temperature range. Additionally, the LMV921M7X amplifiers are capable of rejecting common-mode noise with a fixed gain of up to 60 dB, providing superb accuracy and stability in noisy environments. The LMV921M7X is a 3rd generation amplifier and has been optimized for reduced power, high frequency performance and extremely low noise. This makes it an ideal choice for a variety of sensing applications, such as strain gauges, pressure sensors, thermocouples and other low signal level sensors.

Operating Principle

The LMV921M7X amplifiers have an input stage designed to maximize the common-mode rejection ratio (CMRR) and minimize the voltage noise figure by buffering the input signal from the source along with the reference voltage. The input stage has a differential amplifier that buffers the signal from the source and a second differential amplifier for the reference signal. The signal is then converted to a single-ended representation and buffered to the op-amp stage with a voltage follower. The op-amp stage is an instrumentation amplifier with a differential input, single-ended output stage, and a local feedback topology. It has a low offset voltage, a large common-mode input range and a gain range from unity to 120 dB. The differential output of the op-amp is then routed to a rail-to-rail output stage. This output stage is designed to swing within 0V and the supply voltage and provides a low output impedance, making it suitable for driving loads in noisy environments. It also has a low offset voltage and a wide range of gains.

Applications

The LMV921M7X family is suitable for a wide range of applications, from low power single-supply systems to high power dual-supply systems. Its rail-to-rail capability makes it ideal for driving low power sensors, such as strain gauges, pressure sensors, and thermocouples, while its high CMRR and low noise make it perfect for noisy environments. Other applications include low power audio, instrumentation, control and power management.

Conclusion

The LMV921M7X family of amplifiers is an ideal choice for a variety of sensing applications. It has a rail-to-rail capability, excellent CMRR, low noise, and low offset voltage, making it suitable for a wide variety of low-power sensing applications. Additionally, its wide range of gains makes it suitable for a variety of applications, from low power single-supply systems to high power dual-supply systems.

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