MAX407ESA

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MAX407ESA Application Field and Working Principle

The MAX407ESA from Maxim Integrated is a fully integrated low power, high precision, instrumentation amplifier with a minimum gain accuracy of ±0.15%. This amplifier is ideal for use in demanding applications such as strain gauge measurements, bridge excitation circuits, bridge-based signal conditioning, signal logarithmic converters, peak detector applications, and signal averaging tasks. It is also suitable for circuit design requiring accurate gain setting or signal monitoring in single-supply or low-level applications.

Features of the MAX407ESA

• Very low input offset voltage (5mV), drift, and bias current
• High common-mode rejection (25dB at 1kHz) and gain bandwidth (1.5MHz)
• Low power consumption (100µA)
• Wide supply voltage range (0V to 16V)
• High reliability with guaranteed specifications up to the full rated temperature range (–40°C to +125°C)
• High immunity to EMI

Applications

The MAX407ESA has a wide range of applications. It is frequently used in precision signal conditioning circuits, where its robustness and accuracy make it beneficial for systems with demanding requirements such as industrial process control, medical diagnostics, and general data acquisition. It is also suitable for implementations requiring low leakage, high common-mode rejection, and low power consumption.

In addition, the MAX407ESA can be used for low-noise, low-power applications like RF receivers, and low-level monitoring. Furthermore, its wide supply voltage range, low saturation voltage, common-mode rejection and noise immunity enable it to perform reliably in noisy environments with high levels of electromagnetic interference (EMI).

Working Principle

The MAX407ESA is based on the classic three-op-amp instrumentation amplifier topology. In this circuit, one of the op-amps is used to create the input stage that accepts differential signals, and the other two op-amps work together to provide gain and offset compensation. The gain of the amplifier is set by an external, user-supplied resistor ratio, and the offset is automatically compensated for by the amplifier itself, eliminating the need for additional external components. This greatly simplifies system design.

The MAX407ESA features a wide bandwidth, high common-mode rejection, and low offset voltage (5mV). It eliminates the need for a pair of matched resistors by providing a programmable gain via a single external resistor. As a result, it provides superior linearity and low power consumption, making it an ideal choice for low-noise and low-power applications.

The MAX407ESA offers a high common-mode rejection ratio of 25dB at 1kHz, which is essential for applications that require a high level of accuracy. In addition, its low power consumption, low saturation voltage and wide supply range makes it suitable for a variety of demanding situations, such as interfacing to high-level signals or powering from multiple, unbalanced supplies.

Conclusion

The MAX407ESA from Maxim Integrated is a fully integrated, low-power instrumentation amplifier with a high degree of accuracy and wide dynamic range. Its remarkable common-mode rejection and low offset voltage enable it to be used in many applications requiring accurate gain setting and signal monitoring. Its simplicity and low power consumption make it ideal for applications such as strain gauges, bridge excitation circuits, bridge-based signal conditioning, and medical diagnostics.

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