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Features and Benefits

  • 5000VRMS Isolated Power and SPI Interface
  • Directly Digitizes 2-, 3- or 4-Wire RTDs, Thermocouples, Thermistors and Diodes
  • 10 Flexible Inputs Allow Interchanging Sensors
  • Automatic Thermocouple Cold Junction Compensation
  • Built-In Standard and User-Programmable Coefficients for Thermocouples, RTDs and Thermistors
  • Automatic Burn Out, Short-Circuit and Fault Detection
  • Buffered Inputs Allow External Protection
  • Simultaneous 50Hz/60Hz Rejection
  • Includes 15ppm/°C (Max) Reference
  • Includes Special Protection Modes
  • On-Chip EEPROM Stores Channel Configuration Data and Custom Coefficients

Product Details

The LTM2985 measures a wide variety of temperature sensors and digitally outputs the result, in °C or °F, with 0.1°C accuracy and 0.001°C resolution. The LTM2985 can measure the temperature of virtually all standard (Type B, E, J, K, N, S, R, T) or custom thermocouples, automatically compensate for cold junction temperatures and linearize the results. The device can also measure temperature with standard 2-, 3- or 4-wire RTDs, thermistors and diodes. The LTM2985 includes excitation current sources and fault detection circuitry appropriate for each type of temperature sensor.

The LTM2985 is an isolated 10-channel temperature mea-surement system software compatible with the LTC2986-1. It provides 5kV isolated power and SPI interface to the precision temperature-to-bits converter. The LTM2985 also includes a user-programmable EEPROM for custom sensor data.


  • Direct Thermocouple Measurements
  • Direct RTD Measurements
  • Direct Thermistor Measurements
  • Custom Sensor Applications

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Software & Systems Requirements

Evaluation Software

LTM2985 Demo Software

The LTM2985 demo software is designed to help configure, program and run the LTM2985. It can configure, save the configuration, check for configuration errors, run, output the conversion results into a text file, and create Linduino-ready C code based on the configuration. The software can be used by itself, or used in conjunction with the DC2872A (LTM2985 demo board) demo circuit.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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Up to two boards can be purchased through To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.