MAX5864ETM+T

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Data Acquisition - Analog Front End (AFE)

MAX5864ETM+T is a complete analog front-end solution for bridge-sensor/load-cell and strain-gage interfaces. This device integrates a programmable smart trim DAC, 14-bit high precision ADC, precision instrumentation amplifier, and analog filter circuitry into an ultra-compact package. It supports bridge-sensor types such as Wheatstone bridge and quarter-bridge sensors, as well as load-cell, strain-gage, and other types of sensors.

Features

• High-accuracy trim DAC for sensitive precision settings
• 14-bit ADC for superior resolution
• Programmable analog filter can be used to improve signal-to-noise ratio
• Low-noise, high-impedance instrumentation-amplifier circuitry
• Support for bridge-sensor types such as Wheatstone Bridge and quarter-bridge sensors
• Support for load-cell, strain-gage, and other types of sensors
• Small 12-pin thin QFN SMT package

Applications

The MAX5864ETM+T offers superior performance and reliability suitable for a variety of data acquisition applications. Examples include industrial process-control systems, weigh-scales, medical diagnostic systems, and automotive test equipment. Its integration of high-precision analog front-end circuitry into a compact package makes it ideal for small, portable data acquisition systems.

Working Principle

The signal generated by the bridge sensor is routed through an analog front end (AFE) stage which consists of a programmable, high-precision trim DAC, a low-noise/high-precision instrumentation amplifier, an analog filter, and a 14-bit ADC. The DAC enables users to trim the signal with high accuracy, and the instrumentation amplifier compensates for potential discrepancies in the signal due to bridge sensor type and other factors. The analog filter reduces noise in the signal, and the ADC captures the signal with 14-bit resolution.

The captured data can then be used to calculate the strain, weight, and other parameters of interest. The MAX5864ETM+T is capable of supporting a variety of bridge-sensor and load-cell/strain-gage types, enabling developers to create custom interfaces tailored to the specific application at hand. The device is designed for high accuracy, low power consumption, and superior noise immunity to ensure reliable, accurate performance for data acquisition applications.

Conclusion

The MAX5864ETM+T represents an excellent solution for a wide range of bridge-sensor/load-cell and strain-gage interface applications. With its integration of high-precision trim DAC, low-noise/high-precision instrumentation amplifier circuitry, analog filter, and 14-bit ADC, the device is capable of reliable, accurate performance. Additionally, its small 12-pin thin QFN SMT package ensures it is ideally suited for small, portable data acquisition systems, making it an invaluable component for a variety of applications, from industrial process-control systems to automotive test equipment.

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