LMV344IPWR

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The LMV344IPWR is a linear instrumentation amplifier with differential inputs, high common-mode voltage range, rail-to-rail output, and an adjustable gain. It is designed to add a constant gain of 10V/V to signals within a wide input common-mode and power supply voltage range. This product is particularly suited for applications requiring a high common-mode range and an adjustable gain.

Application Fields

The LMV344IPWR can be used in a wide range of applications, including industrial process control and instrumentation, audio, and medical systems. In industrial process control and instrumentation, it can be used for monitoring temperature, pressure, tilt and vibration in both DC and AC systems. In medical systems, it can be used to monitor respiratory rate, heart rate, and blood pressure. In audio systems, it can be used for volume control and bass/treble control.

Working Principle

The LMV344IPWR follows the instrumentation amplifier topology, which is composed of three main parts—two independent differential input stages with gain selection and a common mode feedback (CMFB) amplifier. This topology is specifically designed for applications requiring high common-mode rejection. The differential input stage amplifies the input signal and provides power gain. The gain is determined by a single-turn or multi-turn precision resistor divider, depending on the product variant. The CMFB amplifier maintains a constant gain by tracking the common-mode voltage and using it to adjust the output voltage of the amplifier. This ensures that the output voltage is not affected by changes in the input common-mode voltage.

Conclusion

The LMV344IPWR is a highly versatile linear instrumentation amplifier with a wide range of applications. It is designed with a differential input stage, a CMFB amplifier, and an adjustable precision resistor divider for an adjustable gain. Its features make it suitable for a variety of industrial, audio, and medical applications.

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