Dual-channel temperature sensor

25 February 2004 Analogue, Mixed Signal, LSI

Analog Devices' ADT7461 digital temperature sensor can monitor a wide temperature range. It automatically cancels temperature errors due to resistance in series with the remote sensor. The default temperature measurement range of 0 to 127°C can be configured to a remote-sensor extended range of -64 to 191°C, used in practice to measure temperatures from -40 to 150°C. The device automatically compensates for as much as 1000 Ω of series parasitic resistance between the sensor and recording circuits - in most cases eliminating the need for system calibration. The device cancels thermal measurement inaccuracies caused by resistance in series with the thermal diode sensor by automatically switching current sources, comparing the resulting output voltages, and calculating the corrected temperature. The remote sensor has 0,25°C resolution and 1°C accuracy; the local sensor has 1°C resolution and 3°C accuracy.

Analog Data Products, 011 809 6100

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