SNIS177B March 2013 – September 2015 LMT90
PRODUCTION DATA.
The LMT90 is a precision integrated-circuit temperature sensor that can sense a −40°C to 125°C temperature range using a single positive supply. The output voltage of the LMT90 has a positive temperature slope of
10 mV/°C. A 500-mV offset is included enabling negative temperature sensing when biased by a single supply.
The temperature-sensing element is comprised of a delta-VBE architecture. The temperature-sensing element is then buffered by an amplifier and provided to the VO pin. The amplifier has a simple class A output stage with typical 2-kΩ output impedance as shown in the Functional Block Diagram. The output impedance has a temperature coefficient of approximately 1300 ppm/°C. Over temperature the output impedance will max out at 4 kΩ.
The LM60 follows a simple linear transfer function in order to achieve the accuracy as listed in Electrical Characteristics:
where
The LMT90's only functional mode is that it has an analog output directly proportional to temperature.