Datasheet

Table Of Contents

Overview

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1 Overview

This document provides the information needed to set up and operate the XTR108EVM-USB evaluation

module, which is a test platform for the XTR108 programmable two-wire transmitter and sensor

conditioner. For a more detailed description of the XTR108, refer to the product data sheet (SBOS187)

available from the Texas Instruments web site at www.ti.com.

The XTR108EVM-USB is an evaluation module that is used to fully evaluate the XTR108. The XTR108 is

an integrated circuit that provides correction of zero, span, and linearization errors for RTDs (resistive

thermal devices) and bridge sensors. Overall system accuracy of 0.1% error (relative to full-scale output

span) or less is easily achievable using a two-point calibration algorithm. The XTR108EVM-USB consists

of three PCBs. One board (the USB DAQ Platform) generates the digital signals required to communicate

with the XTR108. The second board (XTR108EVM-USB Interface Board) provides a convenient interface

to standard multimeters and includes an onboard RTD emulator circuit to facilitate calibration. The third

board (XTR108EVM-USB Sensor Board) contains the XTR108 device as well as support and

configuration circuitry. Once calibrated, the XTR108EVM-USB Sensor Board can be used as a fully-

functional, stand-alone system. Similarly, the USB-DAQ Platform and XTR108EVM-USB Interface Board

can be connected to other stand-alone XTR108 circuitry for quick calibration, making the XTR108EVM-

USB a capable production tool.

XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123–March 2012

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