Linear Technology’s LTC2983 is a high-performance digital temperature measurement IC which directly digitises RTDs, thermocouples, thermistors and external diodes with 0,1°C accuracy and 0,001°C resolution. Its analog front end combines low-noise and low-offset buffered ADCs with all the necessary excitation and control circuits for each sensor. Measurements are performed under the control of a digital engine combining all the algorithms and linearisation required for each.
The chip provides a multiplexed high-precision interface to virtually any sensor. It precisely measures absolute microvolt level signals from thermocouples and ratiometric resistance measurements from RTDs and thermistors, linearises the results and outputs the results in °C or °F. Up to twenty analog inputs are available. The SPI interface works with virtually any digital system and a comprehensive software support system with drop-down menus allows easy customisation.
Dual programmable excitation current sources feature current reversal and current ranging to improve accuracy and reduce noise. To ensure resistive measurements are accurate, current reversal eliminates thermocouple effects in the resistive sensor. Sensor specific fault detection alerts the user of short circuits, open circuits, over- or under-temperature, and ADC over-ranging.
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