A Simple Thermistor Interface to an ADC

Abstract: This article describes a simple and cost effective method of measuring temperature using a thermistor connected in a half-bridge configuration. The goal is to perform a ratiometric measurement such that the VREF source voltage to the divider is the same as the reference to the analog-to-digital converter (ADC) used to measure the voltage at VT.
Maxim > App Notes > A/D and D/A CONVERSION/SAMPLING CIRCUITS

Keywords: half bridge, thermistor, ADC, A/D converter, NTC, PTC, ratiometric, negative temperature Sep 27, 2002
coefficent, position temperature coefficent, analog to digital converters

APPLICATION NOTE 1753
A Simple Thermistor Interface to an ADC

Abstract: This article describes a simple and cost effective method of measuring temperature using a thermistor
connected in a half-bridge configuration. The goal is to perform a ratiometric measurement such that the VREF
source voltage to the divider is the same as the reference to the analog-to-digital converter (ADC) used to
measure the voltage at VT.


There are many circuits and measurement methods that can be used with a thermistor to determine the
temperature. The simplest a