LTM2985

RECOMMENDED FOR NEW DESIGNS

Isolated High Accuracy Digital Temperature Measurement System with EEPROM

Analog Devices LTM2985 Product Info

10 February 2026 6

Features

5000V_RMS 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

Part details & applications

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.

APPLICATIONS

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

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