This reference design that is precision verified implements an analog input module for industrial voltages, currents and temperature sensors. For industrial outputs, the possible input ranges include: 4 to 20 mA, 0 to 20 mA, +/-25 mA, 0 to 5 V, 0 to 10 V, +/-5 V and +/-10 V. The design includes conditioning and level-shift circuitry which converts large industrial outputs into a proper input range for a +5V delta-sigma ADC. The ADC has features to directly acquire information from the RTD and thermocouple sensors over their full temperature range.
Features
- Includes theory, component selection, TINA-TI simulation, PCB schematic and layout, bill of materials and measured performance
- Voltage input range: +/-10 V, 0 to 10V , +/-5V , 0 to 5 V
- Current input range: +/-24 mA, 0 to 20 mA, 4 to 20 mA
- 3-wire RTD temperature range: -200 to 850°C
- Thermocouple range: -210 to 1190°C
- Thermocouple cold junction compensation range: 0 to 50°C