MAX4387ESA+

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The MAX4387ESA+ is an instrumentation amplifier with a low offset, low power consumption, and high common-mode rejection ratio (CMRR). It is designed for use with differential input signals, such as those produced by bridge circuits, voltage dividers, or Wheatstone bridges. It can also be used in other applications that require accurate and low-noise amplification of a small-signal source.

The MAX4387ESA+ is ideal for applications in medical and automotive instrumentation, instrumentation for industrial test and measurement systems, data acquisition systems, and medical/healthcare applications that require accurate, low noise small signal processing. Additionally, it can be used in applications requiring a small foot print and minimal power consumption.

Application Field

The MAX4387ESA+ can be used in a wide variety of instrumentation applications, including bridge and voltage divider circuits, audio signal measurement and analysis, instrumentation systems, thermocouple and RTD measurements, indirect strain gages, pressure transducers and flow meters, as well as in precision closed-loop control and programmable logic controllers (PLCs). The MAX4387ESA+ is also suitable for use in medical instrumentation systems, such as ECG, EEG, and EKG, for monitoring biopotential signals. Additionally, it can be used in laboratory and industrial applications, including industrial automation, vibration and position sensing, and high-accuracy measurement and control systems.

Working Principle

The MAX4387ESA+ is a differential amplifier with an instrumentation amplifier topology. It is designed to convert differential input signals into a single-ended output. Each gain stage uses a combination of transistors to reduce input offset voltage and optimize common-mode rejection ratio (CMRR). Within each gain stage, the transistors are operated at low voltage and provide a cost-effective solution for improving input and output performance.

The MAX4387ESA+ uses a series of gain stages, each with a maximum gain of 15V/V and a maximum input voltage of ±3V (measured using the common-mode input voltage). For single-ended operation, the gain can be set between 0 and 10V/V. The input voltage range can also be set between±2.5V and ±3V. The output voltage is limited to ±20V.

The MAX4387ESA+ is designed to provide a low-noise amplification of the input signal. It achieves this by using a differential input stage, which reduces the input-referred noise by more than 3dB. Additionally, the common-mode rejection ratio (CMRR) can be adjusted to ensure a low-noise output signal with excellent linearity over the full range of the input signal. The CMRR of the MAX4387ESA+ is typically 80dB.

The MAX4387ESA+ also features a wide bandwidth and wide input common-mode voltage range, making it an excellent choice for a variety of analog signal processing applications. The typical bandwidth is 350 kHz, while the common-mode voltage range is ±3.3V. The MAX4387ESA+ provides a high accuracy and low noise amplification, which is ideal for use in precision analog signal processing.

Conclusion

The MAX4387ESA+ is an ideal choice for applications that require accurate, low noise small signal processing. It has a low offset, low power consumption and wide common-mode rejection ratio, making it suitable for use in a variety of instrumentation applications. The MAX4387ESA+ is able to convert differential input signals into a single-ended output with a high accuracy and low noise amplification. It has a wide bandwidth and wide input common-mode voltage range, which make it an excellent choice for a variety of analog signal processing applications.

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