Linear LTC2983多传感器高精度数字温度测量系统方案

Linear公司的LTC2983能测量各种温度传感器并以数字输出,分辨率0.001℃,精度0.1℃,可以测量2/3/4线RTD,温度调节器和二极管.器件包括20个可配置的模拟输入端,激励电流源和对每种传感器的故障检测电路.工作电压2.85V-5.25V,主要用在热电偶,RTD和温度调节器的温度直接测量,以及专用传感器应用.本文介绍了LTC2983主要特性,框图,典型应用电路,以及包括LTC2983入门板,主板(DC2209),20输入分接板(DC2210)和Linduino One (DC2026)的温度测量系统DC2296A特性,电路图和材料清单.
The LTC?2983 measures a wide variety of temperature sensors and digitally outputs the result, in ℃ or °F, with 0.1℃ accuracy and 0.001℃ 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 10ppm/℃ (maximum) reference.
LTC2983主要特性:
 Directly Digitize RTDs, Thermocouples, Thermistors, =and Diodes
 Single 2.85V to 5.25V Supply
 Results Reported in ℃ or °F
 20 Flexible Inputs Allow Interchanging Sensors
 Automatic Thermocouple Cold Junction Compensation
 Built-In Standard and User-Programmable Coefficients for Thermocouples, RTDs and Thermistors
 Configurable 2-, 3-, or 4-Wire RTD Configurations
 Measures Negative Thermocouple Voltages
 Automatic Burn Out, Short-Circuit and Fault Detection...