ADI LTC2984ILX#PBF

Capable of measuring multiple types of temperature sensors and outputting results digitally in °C or °F, with 0.1°C accuracy and 0.001°C resolution. Supports temperature measurement of virtually all standard thermocouple types (B, E, J, K, N, S, R, T) as well as custom thermocouples, with automatic cold-junction compensation and result linearization. Additionally, the device can measure temperature using standard 2-wire, 3-wire, or 4-wire RTDs, thermistors, and diodes. Features 20 reconfigurable analog inputs, enabling a wide variety of sensor connection and configuration options. Includes excitation current sources and fault detection circuitry for each sensor type, as well as an EEPROM for storing custom coefficients and channel configuration data. Connects directly to ground-referenced sensors without the need for level shifters, negative supply voltages, or external amplifiers. All signals are buffered and simultaneously digitized by three high-accuracy 24-bit ΔΣ ADCs, driven by an internal 10ppm/°C (maximum) reference voltage source.

• Direct digitization of 2-wire, 3-wire, or 4-wire RTDs, thermocouples, thermistors, and diodes
• On-chip EEPROM for storing channel configuration data and custom coefficients
• 2.85V to 5.25V single supply
• 20 flexible inputs supporting interchangeable use of different sensor types
• Automatic thermocouple cold junction compensation
• Built-in standard coefficients and user-programmable coefficients for thermocouples, RTDs, and thermistors
• Negative thermocouple voltage measurement capability
• Automatic detection of burnout, short circuit, and faults
• Buffered inputs with external protection
• Simultaneous 50Hz/60Hz rejection
• Integrated voltage reference with 15ppm/°C (maximum) temperature coefficient (Grade I)

• Direct thermocouple measurement
• Direct RTD measurement
• Direct thermistor measurement
• Custom sensor applications