LTC2984CLX#PBF

Thermal Management Overview

The LTC2984CLX#PBF is a multi-sensor digital temperature measurement system in a 48-lead LQFP package. It digitizes thermocouples, RTDs, thermistors, and diodes with 0.1°C accuracy and 0.001°C resolution using three 24-bit delta-sigma ADCs. Operating on a single 2.85V to 5.25V supply, it features 20 reconfigurable analog inputs, automatic cold junction compensation, and an onboard EEPROM for storing custom coefficients and channel configurations.

Thermal Management Feature Summary

• Digitizes standard and custom thermocouples, RTDs, thermistors, and diodes directly without external amplifiers or level shifters.
• Includes built-in excitation current sources and fault detection circuitry appropriate for each sensor type.
• Features an onboard EEPROM for storing channel configuration data and user-programmable coefficients.
• Provides simultaneous 50Hz/60Hz rejection and automatic burn-out, short-circuit, and fault detection.

Thermal Management Applications

• Direct thermocouple measurements with automatic cold junction compensation
• Direct RTD measurements including 2-, 3-, and 4-wire configurations
• Direct thermistor measurements using ratiometric techniques
• Custom sensor applications requiring stored calibration coefficients

Thermal Management Procurement Notes

Verify the specific C-grade temperature range (0°C to 70°C) against application requirements. Confirm the LQFP-48 package dimensions match the PCB footprint. Ensure the SPI interface timing aligns with the host controller capabilities. Check for lead-free compliance status if required by project specifications.

Thermal Management Selection Notes

Select this component when high accuracy across multiple sensor types is required within a single channel. The C-grade variant is suitable for commercial environments operating between 0°C and 70°C. Consider the I-grade or H-grade variants if operation below 0°C or above 70°C is necessary. Verify that the 20-channel input count meets the system's monitoring needs.

Thermal Management Part Context

This part belongs to the Analog Devices LTC2984 family of digital temperature measurement systems. The CLX suffix indicates the commercial temperature grade and tape-and-reel packaging format. It serves as a centralized solution for replacing discrete signal conditioning circuits in complex thermal monitoring architectures.

Thermal Management Replacement Considerations

LTC2984ILX#PBF

Thermal Management FAQ

How does the device handle thermocouple cold junction compensation?

The LTC2984 automatically measures the cold junction temperature using internal diodes, RTDs, or thermistors connected at the junction point, then performs the necessary polynomial calculations to determine the final thermocouple temperature.

What is the function of the onboard EEPROM?

The EEPROM stores channel configuration data, allowing users to define input types and modes. It also retains custom coefficients for non-standard sensors and linearization tables, ensuring data persistence during power cycles.