LTC2984HLX#PBF

Thermal Management Overview

The LTC2984HLX#PBF is a multi-sensor high-accuracy digital temperature measurement system with EEPROM, manufactured by Analog Devices Inc. It measures thermocouples, RTDs, thermistors, and diodes, outputting results in °C or °F with 0.1°C accuracy and 0.001°C resolution. The device features 20 reconfigurable analog inputs, automatic cold junction compensation, and built-in excitation current sources. It operates on a single 2.85V to 5.25V supply and utilizes a 24-bit delta-sigma ADC driven by an internal reference. The H-grade variant supports an operating temperature range of -40°C to +125°C and is housed in a 48-lead LQFP package.

Thermal Management Feature Summary

• Directly digitizes standard and custom thermocouples, RTDs, thermistors, and diodes without external amplifiers
• Includes on-chip EEPROM for storing channel configuration data and custom coefficients
• Provides automatic burn-out, short-circuit, and fault detection circuitry
• Features buffered analog inputs allowing direct interfacing with ground-referenced sensors

Thermal Management Applications

• Thermocouple measurements with automatic cold junction compensation
• Direct RTD measurements using 2-, 3-, or 4-wire configurations
• Direct thermistor measurements utilizing Steinhart-Hart equations
• Custom sensor applications requiring user-programmable coefficients

Thermal Management Procurement Notes

Verify the specific H-grade designation (-40°C to +125°C) against project thermal requirements. Confirm the LQFP-48 package dimensions match the PCB footprint. Ensure the SPI interface timing aligns with the host controller's capabilities. Check RoHS compliance status if required by local regulations.

Thermal Management Selection Notes

Select this component when high accuracy across multiple sensor types is required within a single channel. The H-grade is necessary for environments exceeding 70°C. Consider the 20-channel flexibility for interchangeable sensor connections. Evaluate the need for onboard EEPROM storage for calibration data versus external memory solutions.

Thermal Management Part Context

This part belongs to the LTC2984 family of temperature measurement systems. The HLX suffix indicates the extended industrial/high-temperature grade (-40°C to +125°C) compared to the C-grade (0°C to 70°C). It shares the same functional architecture as other variants but differs in thermal performance specifications.

Thermal Management Replacement Considerations

LTC2984CLX#PBF: Lower temperature grade (0°C to 70°C). LTC2984ILX#PBF: Industrial temperature grade (-40°C to 85°C). Both are pin-compatible but require thermal validation.