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TIPD152
0°C – 100°C, Hardware-Compensated Ratiometric 3-Wire RTD System Reference Design
TIPD152
Overview
This TI Precision Verified Design implements a hardware compensated 3-wire RTD acquisition system that accurately measures temperature from 0°C - 100°C. The voltage input and reference voltage are placed in a ratiometric configuration in order to reduce the errors from noise and drift and improve overall system accuracy. The ADS1247 simplifies the front-end solution through integration of the required current sources, programmable gain amplifier, and digitally-controlled multiplexer in to one chip. The current sources are chopped to minimize any mismatch between the two sources. The TPS7A4901 adjustable-output, high-PSRR LDO is suggested as a clean power alternative versus the existing USB supply to further improve system accuracy.
Features
- Measures temperature from 0°C - 100°C from 3-wire RTD
- Single-Supply Solution
- Ratiometric configuration
- Utilizes ADS1247, 24-bit ΔΣ ADC
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDR344.PDF (100 K)
Detailed schematic diagram for design layout and components
TIDC215.ZIP (647 K)
Detailed schematic diagram for design layout and components
TIDR345.PDF (68 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDC240.ZIP (321 K)
Design file that contains information on physical board layer of design PCB
Products
Includes TI products in the design and potential alternatives.
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Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | User guide | Hardware-Compensated Ratiometric 3-Wire RTD System Design Guide | Dec. 12, 2013 |
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