XTR114UG4

The XTR114UG4 is an integrated signal conditioning circuit specifically designed to provide a bridge interface between a variety of resistive or strain-gauge based sensing elements and a standard A/D converter. Its low cost, small size, performance, and exceptional accuracy all make it a great choice for applications that require precision measurement of non-electrical parameters. In this article, we will discuss the application field, working principle, and features of the XTR114UG4.

Application Field

The XTR114UG4 is ideal for a wide range of applications including instrumentation, control, process monitoring, and pressure, torque, and level measurement. It is designed to interface resistive elements such as strain gauges, thermistors, or pressure-sensitive resistors, to a single-ended or differential A/D converter. Since they are low power, they are well suited for battery operated or portable instruments. The XTR114UG4 is also well suited for custom transducer applications in the automotive, aerospace, medical, and industrial markets.

Working Principle

The XTR114UG4 utilizes a four-wire full-bridge differential amplifier driven by a self-heating heating resistor. The four wires consist of an excitation voltage (VREF), the two sensing elements that are connected to the two sense inputs (SIN and SIP), and the output voltage (VOUT) that is proportional to the input sensitivity. The excitation voltage is generated from a temperature-stable reference voltage and current source. The output of the XTR114UG4 is a voltage that is proportional to the bridge resistance and is linear from 0 to full scale.

The full-bridge amplifier uses matched gain resistors for both the positive and negative halves of the bridge. This configuration allows the device to accurately measure different types of transducers, including those with low-impedance sensing elements such as strain gauges. The XTR114UG4 also offers high common mode rejection to suppress interference and noise, ensuring an accurate and reliable reading.

Features

The XTR114UG4 is a single-chip solution with a wide temperature range of -40°C to +125°C. Its low-power consumption makes it ideal for portable and battery-operated instruments. It also features load regulation of up to ±0.1% and low offset drift of only ±1µV/°C temperature drift. The XTR114UG4 also An integrated remote sensing circuit that can be used to program the device to automatically adjust its gain and offset over long cable lengths. This helps to further improve accuracy over long distances.

Overall, the XTR114UG4 is an excellent choice for applications that require precision measurement of non-electrical parameters. It offers an easy to use interface, low cost, small size, performance, and exceptional accuracy. It can be used in a variety of applications including instrumentation, control, process monitoring, and pressure, torque, and level measurement. With its long temperature range and low-power consumption, the XTR114UG4 is a great choice for custom transducer applications in the automotive, aerospace, medical, and industrial markets.