LTC2983 Multi-Sensor, High-Accuracy, Digital Temperature Measurement System

Analog Devices' LTC2983 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 LTC2983 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. It has 20 reconfigurable analog inputs enabling many sensor connections and configuration options. The LTC2983 includes excitation current sources and fault detection circuitry appropriate for each type of temperature sensor.

The LTC2983 allows direct interfacing to ground referenced sensors without the need for level shifters, negative supply voltages, or external amplifiers. All signals are buffered and simultaneously digitized with three high accuracy, 24-bit ΔΣ ADC's, driven by an internal 10 ppm/°C (maximum) reference.

Features
Directly digitize RTDs, thermocouples, thermistors and diodes Single 2.85 V to 5.25 V supply 20 flexible inputs allow multiple sensor types Automatic thermocouple cold junction compensation Standard and user-programmable coefficients for linearizing thermocouples, RTDs and thermistors Configurable 2-, 3-, 4-wire RTD configurations Measures negative thermocouple voltages without a negative supply Automatic burn out, short-circuit and fault detection Buffered inputs allow external protection and direct interface to resistive sensors Simultaneous 50 Hz / 60 Hz rejection Includes 10 ppm/°C (max) reference
Applications
Direct thermocouple measurements Direct RTD measurements Direct thermistor measurements Custom sensor applications

Videos: LTC2983 TechClips
RTD - Temp measurement system directly interfaces to RTDs, applies excitation current, simultaneously measures the RTD and sense resistor.		Thermistor - Temp measurement system directly interfaces to thermistors, applies excitation current, simultaneously measures thermistor and sense resistor.		Thermocouple - Temp measurement system directly interfaces to thermocouples, simultaneously measures thermocouple output voltage and cold junction temperature.