PB Fortich

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  • PIXI Technology with RTD Signal Conditioning/Analog Front End Circuit

  • Created: Apr 09, 2017

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Summary

In regular residences, a monitoring of room temperature is not so significant as long as it does harm or distract people who occupy the room then the room temperature is fine. However, in rooms or areas that involve process of products or operations, temperature monitoring is important since it can alter operations. A Resistance Temperature Detector (RTD) is a device that uses resistance to monitor temperature. In this design, it make use of zero drift operational amplifier that can eliminate cost of calibration with increased accuracy by Maxim’s patented autozero circuitry, and it also reduces power for sensitive precision applications.


This RTD signal conditioning/analog front end circuit comprised of few discrete components but it uses MAX44248 IC as main signal amplifier. The PT100 RTD is connected to the three known resistors that is in wheatstone bridge circuit. The signal is transmitted through RC connection tapped on the non-inverting inputs of the amplifier. It amplifies analog signal before its transmission to PIXI for ADC operation. This PIXI MAX11300 IC contains 12-bit ADC and DAC that assist host controller or MCUs and receives the amplified signal and convert the signal to 4-20mA current with DACs.


PIXI technology has a lot of applications especially to designs that includes ADC and DAC. It can also increase system efficiency, and adapts to specific application requirements and allows for easy reconfiguration as system needs change.

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