ADC-RTD-CONFIG-CALC

Resistance temperature detector (RTD) configuration calculator for precision ADCs

ADC-RTD-CONFIG-CALC

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Overview

This resistance temperature detector (RTD) configuration calculator is a Microsoft® Excel-based tool that helps the user identify a system solution for an RTD application. Two-, three- and four-wire RTD configurations are shown by default, with options for a high-side or low-side reference resistor and one or two integrated digital-to-analog converter (IDAC) current sources for the three-wire RTD.

Additionally, the calculator supports a wide variety of RTD types and precision analog-to-digital converters (ADCs). Use this calculator to select the reference and bias resistor values, IDAC current and gain setting for each configuration. Moreover, the calculator provides a first-order approximation of the total error to the help the user identify the largest error sources in the system.

Features
  • Determine system parameters for up to five different RTD configurations
  • Integrated algorithm optimizes reference and bias resistor values (macros must be enabled)
  • Configure the system with any of the precision ADCs commonly used in RTD measurements
  • Supports two-, three- and four-wire RTDs, as well as high-side and low-side reference resistors
  • Choose from a wide variety of different RTD types, including Pt, Ni, Cu, and NiFe
  • First-order error approximations before and after calibration

Get started

  1. Download the calculator .zip file
  2. Extract and open the calculator
  3. Review how to use the calculator in the Instructions tab
  4. Enable macros (if applicable)

Downloads

Calculation tool

ADC-RTD-CONFIG-CALC Resistance temperature detector (RTD) configuration calculator for precision ADCs

Supported products & hardware

Supported products & hardware

Precision ADCs (<=10MSPS)
ADS1120 16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & SPI interface ADS112C04 16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & I2C interface ADS112U04 16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface ADS114S06 16-bit, 4-kSPS, 6-ch delta-sigma ADC with PGA and voltage reference for sensor measurement ADS114S06B 16-bit, 4-kSPS, 6-ch delta-sigma ADC With PGA and voltage reference for low-cost applications ADS114S08 16-bit, 4-kSPS, 12-ch delta-sigma ADC with PGA and voltage reference for sensor measurement ADS114S08B 16-bit, 4-kSPS, 12-ch delta-sigma ADC with PGA and voltage reference for low-cost applications ADS1220 24-bit, 2-kSPS, four-channel, low-power, delta-sigma ADC with PGA, VREF, SPI and two IDACs ADS122C04 24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & I2C interface ADS122U04 24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface ADS124S06 24-bit, 4-kSPS, 6-ch delta-sigma ADC with PGA and voltage reference for precision sensor measurement ADS124S08 24-bit, 4-kSPS, 12-ch delta-sigma ADC with PGA and voltage reference for sensor measurement ADS125H01 24-bit, 40-kSPS, 1-ch delta-sigma ADC with low-noise PGA and ±20-V input ADS125H02 24-bit, 40-kSPS, 2-ch delta-sigma ADC with ±20-V input, PGA, IDACs, GPIOs and VREF ADS1260 24-bit, 40-kSPS, 5-ch delta-sigma ADC with PGA, VREF and IDACs for factory automation ADS1261 24-bit, 40-kSPS, 10-ch delta-sigma ADC with PGA, VREF, IDACs & AC excitation for factory automation

Technical documentation

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Type Title Date
Application note RTD Wire-Break Detection Using Precision Delta-Sigma ADCs PDF | HTML Feb. 18, 2021
Application note A Basic Guide to RTD Measurements Jun. 19, 2018

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