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- Hardware-Compensated Ratiometric 3-Wire RTD System Design Guide
(PDF 1141 KB)
12 Dec 2013 852 views
TIPD152 Design File
(ZIP 647 KB)
13 Dec 2013 134 views
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.
- Measures temperature from 0°C - 100°C from 3-wire RTD
- Single-Supply Solution
- Ratiometric configuration
- Utilizes ADS1247, 24-bit ΔΣ ADC