TIDA-010019
RTD replacement for cold junction compensation reference design in a temperature sensor
TIDA-010019
Overview
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
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDUEE1A.PDF (4060 K)
Reference design overview and verified performance test data
TIDRZC3.PDF (649 K)
Detailed schematic diagram for design layout and components
TIDRZC4.PDF (107 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDRZC5.PDF (540 K)
Detailed overview of design layout for component placement
TIDRZC7.ZIP (1712 K)
Files used for 3D models or 2D drawings of IC components
TIDCFD4.ZIP (381 K)
Design file that contains information on physical board layer of design PCB
TIDRZC6.PDF (2097 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
Analog temperature sensors
LMT70 — 0.1C analog temperature sensor, -5.19 mV/C, high-precision matched pairs, output enable pin
Data sheetAnalog temperature sensors
TMP235 — 1C analog temperature sensor, 10 mV/C
Data sheetDigital isolators
ISO7721 — Robust EMC, dual-channel, 1/1, reinforced digital isolator
Data sheetDigital temperature sensors
LMT01 — 0.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface
Data sheetDigital temperature sensors
TMP117 — 0.1C digital temperature sensor, 48-bit EEPROM, PT100/PT1000 RTD replacement
Data sheetInstrumentation amplifiers
INA317 — Micro-power (50µA), zero-drift (75µV offset, 0.3µV/˚C), precision RRO instrumentation amplifier
Data sheetLinear & low-dropout (LDO) regulators
TPS727 — 250-mA, ultra-low-IQ, low-dropout voltage regulator with enable
Data sheetLoad switches
TPS22946 — 5.5-V, 0.15-A, 400-mΩ load switch with selectable current limit
Data sheetMSP430 microcontrollers
MSP430FR2355 — 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Data sheetPrecision ADCs (<=10MSPS)
ADS112U04 — 16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface
Data sheetPrecision ADCs (<=10MSPS)
ADS7142 — 12-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package
Data sheetPrecision op amps (Vos<1mV)
LPV821 — 650nA, Precision Zero-Drift Nanopower Amplifier
Data sheetSeries voltage references
REF2125 — Low-drift, low-power, small-footprint series voltage reference with clean start
Data sheetStart development
Technical documentation
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| Type | Title | Date | |
|---|---|---|---|
| * | Design guide | RTD Replacement for Cold Junction Compensation Reference Design (Rev. A) | Sep. 13, 2019 |
| Application note | RTD Class-AA Replacement With High-Accuracy Digital Temperature Sensors in Field (Rev. A) | Jul. 22, 2019 |
Related design resources
Reference designs
REFERENCE DESIGN
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