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| LTC2983精密數字溫度測量系統方案 |
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| 文章來源： 更新時間：2014/11/18 9:25:00 |
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Linear公司的LTC2983是多個傳感器高精度數字溫度測量系統,測量精度℃或°F,精度0.1℃ ,分辨率0.001℃,單電源2.85V-5.25V工作,主要用于溫度直接測量,RTD直接測量, 電熱調節器直接測量和定制傳感器應用.本文介紹了LTC2983主要特性,功能框圖,應用電路以及演示板DC2296A主要特性,電路圖和材料清單.
Multi-Sensor High Accuracy Digital Temperature Measurement System
The LTC2983 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
Buffered Inputs Allow External Protection
Simultaneous 50Hz/60Hz Rejection
Includes 10ppm/℃ (max) Reference (I-Grade)
LTC2983應用:
Direct Thermocouple Measurements
Direct RTD Measurements
Direct Thermistor Measurements
Custom Sensor Applications
圖1. LTC2983框圖
圖2. LTC2983帶冷端自動補償的熱電耦測量電路圖
圖3. LTC2983典型熱電耦應用框圖
圖4. LTC2983典型RTD/電熱調節器應用框圖
LTC2983演示板DC2296A(LTC2983主板(DC2209)+20輸入分接板(DC2210)
The DC2296 is the starter kit for demonstrating the performance and ease of use of the LTC®2983, which is a complete temperature measurement system on a chip.
This kit includes the DC2209 (main demo circuit containing the LTC2983) and the DC2210 (a simple experiment circuit allowing bread boarding). In addition to the starter demonstration kit, sensor specific demonstration boards highlighting the performance of RTDs, thermistors, or thermocouples are also available.
• Universal Temperature Measurement Board – DC2211
• Thermocouple Board – DC2212
• Dedicated RTD Board – DC2213
• Dedicated Thermistor Board – DC2214 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval and Linduino are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
The DC2209 is a member of the QuikEval™ family of demonstration boards. It is designed to allow easy evaluation of the LTC2983 and may be connected to any one of the sensor daughter boards.
These daughter boards allow evaluation of the various LTC2983 sensor types.
The DC2296 is the starter kit for demonstrating the performance and ease of use of the LTC®2983, which is a complete temperature measurement system on a chip. This kit includes the DC2209 (main demo circuit containing the LTC2983) and the DC2210 (a simple experiment circuit allowing bread boarding). In addition to the starter emonstration kit, sensor specific demonstration boards highlighting the performance of RTDs, thermistors, or thermocouples are also available.
圖5.DC2209溫度測量演示板連接圖
圖6.DC2209溫度測量演示板系列產品
圖7.LTC2983精密數字溫度測量系統電路圖
數字溫度測量系統材料清單:
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