Linear Technology has introduced the LTC2997, a temperature-to-voltage converter with built-in series resistance cancellation for 2.5 to 5.5V systems. The converter is a micropower temperature monitoring solution that is claimed to measure a remote diode's temperature with ±1°C accuracy or local temperature with ±1.5°C accuracy, and outputs a voltage proportional to absolute temperature.
The converter is suitable for applications including system thermal control, energy harvesting, desktop and notebook computers, network servers and environmental monitoring. Two current sense inputs can be configured to measure either local or remote temperature. A built-in algorithm cancels the errors due to sensor series resistance when measuring a diode or transistor voltages. A 1.8V voltage reference output is also available to share with an external ADC or for generating temperature threshold voltages to compare against the VPTAT (proportional-to-absolute-temperature) output. The converter converts the remote or internal diode temperature to analogue voltage. It provides 4mV/°C output gain and 170µA quiescent current.
The converter is available in commercial, industrial and automotive versions, supporting operating temperature ranges from 0 to 70°C, -40 to +85°C, and -40 to +125°C, respectively. It is available in a RoHS-compliant, 6pin, 2x3mm DFN package.
