LM7372MRX/NOPB

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The LM7372MRX/NOPB is an instrumentation amplifier and buffer amp with a wide range of applications, including industrial, medical, and automotive. Its characteristics of low-noise and low-power operation, coupled with its high input impedance and low output impedance, make it ideal for use in a variety of situations where precision signal conditioning is required.

The LM7372MRX/NOPB is based on the instrumentation amplifier topology, as described in greater detail in AN-196, “Instrumentation Amplifier Basics.” The instrumentation amplifier utilizes two differential inputs, to which each channel’s input signal is applied, as well as a reference signal, which is subtracted from both channels. The difference signal is then multiplied by a gain factor and applied to the output.

At the heart of the LM7372MRX/NOPB is the Fairchild Semiconductor FET-Input Operational Amplifier. This op-amp is the device responsible for producing gain within the input signal. The differential input stage of the amplifier can be set to have any gain from 0 to 7222, depending on the values of the feedback resistors. The gain accuracy of the device is 0.5% at most.

The output stage of the LM7372MRX/NOPB is drive dependent, meaning that the output can range from 0 to 3.2V. This range is set by the power supply voltage; the higher the voltage is, the more headroom the amplifier will have. The output impedance of the device is 5Ω, making it suitable for driving high-impedance loads. The output stage is unity gain stable and has a slew rate of up to 10V/uS. The output is protected from overvoltages with clamping diodes.

In addition to its instrumentation amplifier capabilities, the LM7372MRX/NOPB also acts as a buffer amplifier. This functionality is provided by a unity-gain buffer amplifier stage, which provides a gain of 1 while maintaining low output impedance; that is, the output waveform remains unaltered. The buffer amplifier also retains the input impedance of the instrumentation amplifier, allowing it to be used as a buffer to drive higher impedance loads.

The LM7372MRX/NOPB can operate from a single 5V supply and draws a maximum supply current of 20mA. The device is available in three-lead PDIP and SOIC packages and requires only a few external components for proper operation. In addition, a gain control pin is available on the device, allowing for easy gain adjustments without the need for external components.

The LM7372MRX/NOPB is a versatile device, capable of providing precision signal conditioning in a range of different applications. Its low noise and low power operation, combined with its high input impedance and low output impedance makes it an ideal choice for precision signal conditioning in industrial, medical, and automotive applications.

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