RTD replacement for cold junction compensation reference design in a temperature sensor
TIDA-010019
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Key Document
Description
Temperature-sensing applications that use a thermocouple (TC) require an accurate local temperature sensor to achieve high accuracy. Solutions for design challenges such as cold-junction compensation (CJC) or including an ultra-low power TC analog front-end are highlighted and addressed in this reference design. Performance in terms of power consumption and accuracy is optimized for accurate 4 to 20 mA sensors while also demonstrating the performance of different CJC and TC front-end implementations.
Features
- Ultra-low power TC front end: < 200 µA
- RTD type performance with silicon temperature sensors
- 16-bit ADC for 0.05 °C resolution
- Comparing different CJC solutions
- TC temperature from -270 °C to 1200 °C
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Schematic/Block Diagram
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Design Guide
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TI Devices (13)
Order samples, get tools and find more information on the TI products in this reference design.
| Sample & Buy |
Design Kits & Evaluation Modules |
| ADS112U04 |
16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface |
Analog-to-digital converters (ADCs) |
Sample & Buy |
View Design Kits & Evaluation Modules |
| ADS7142 |
12-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package |
Analog-to-digital converters (ADCs) |
Sample & Buy |
View Design Kits & Evaluation Modules |
| INA317 |
Micro-power (50µA), zero-drift (75µV offset, 0.3µV/˚C), precision RRO instrumentation amplifier |
Amplifiers |
Sample & Buy |
Not Available |
| ISO7721 |
Robust EMC, dual-channel, 1/1, reinforced digital isolator |
Isolation |
Sample & Buy |
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| LMT01 |
0.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface |
Temperature sensors |
Sample & Buy |
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| LMT70 |
±0.1°C ultra-small, high-precision, low-power CMOS analog temperature sensor |
Temperature sensors |
Sample & Buy |
View Design Kits & Evaluation Modules |
| LPV821 |
650nA, Precision Zero-Drift Nanopower Amplifier |
Operational amplifiers (op amps) |
Sample & Buy |
View Design Kits & Evaluation Modules |
| MSP430FR2355 |
24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD |
Microcontrollers (MCUs) |
Sample & Buy |
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| REF2125 |
Low-drift, low-power, small-footprint series voltage reference with clean start |
Voltage references |
Sample & Buy |
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| TMP117 |
±0.1°C accurate digital temperature sensor with integrated NV memory |
Temperature sensors |
Sample & Buy |
View Design Kits & Evaluation Modules |
| TMP235 |
±1.2°C 2.3V to 5.5V analog output temperature sensor with 10 mV/C gain |
Temperature sensors |
Sample & Buy |
View Design Kits & Evaluation Modules |
| TPS22946 |
5.5-V, 0.15-A, 400-mΩ load switch with selectable current limit |
Power switches |
Sample & Buy |
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| TPS727 |
250-mA, ultra-low-IQ, low-dropout voltage regulator with enable |
Power management |
Sample & Buy |
View Design Kits & Evaluation Modules |
CAD/CAE symbols
Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.
Step 1: Download and install the free download.
Step 2: Download the Symbol and Footprint from the CAD.bxl file table.
Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.
Step 1: Download and install the free download.
Step 2: Download the Symbol and Footprint from the CAD.bxl file table.
Step 3: Open the .bxl file with the Ultra Librarian software.
You can always access the complete CAD/CAE Symbols database at https://webench.ti.com/cad/
Both PCB footprints and schematic symbols are available for download in a vendor neutral format, which can then be exported to the leading EDA CAD/CAE design tools using the Ultra Librarian Reader. The reader is available as a (free download.).
The UL Reader is a subset of the Ultra Librarian toolset that can generate, import, and export components and their attributes in virtually any EDA CAD/CAE format.
Technical documentation
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Application note (1)
| Title | Type | Size (KB) | Date |
| | PDF | 1105 |
22 Jul 2019
|
User guide (1)
| Title | Type | Size (KB) | Date |
| | PDF | 4060 |
13 Sep 2019
|
Design files (6)
| | ZIP | 381 |
19 Mar 2019
|
| | ZIP | 1712 |
19 Mar 2019
|
| | PDF | 2097 |
19 Mar 2019
|
| | PDF | 540 |
19 Mar 2019
|
| | PDF | 107 |
19 Mar 2019
|
| | PDF | 649 |
19 Mar 2019
|
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