ADT45

a FEATURES Low Voltage Operation (2.7 V to 12 V) Calibrated Directly in ؇C 10 mV/ ؇C Scale Factor ؎ 2؇C Accuracy Over Temperature (typ) ؎ 0.5؇C Linearity (typ) Stable with Large Capacitive Loads Specified –40؇C to +125؇C, Operation to +150؇C Less than 60 mA Quiescent Current Low Self-Heating APPLICATIONS Environmental Control Systems Thermal Protection Industrial Process Control Fire Alarms Power System Monitors CPU Thermal Management Low Voltage SOT-23 Temperature Sensors ADT45/ADT50 FUNCTIONAL BLOCK DIAGRAM +Vs (2.7V to 12V) ADT45 ADT50 VOUT PACKAGE TYPES AVAILABLE SOT-23 +VS 1 TOP VIEW 3 GND (Not to Scale) VOUT 2 GENERAL DESCRIPTION The ADT45 and ADT50 are low voltage, precision centigrade temperature sensors. They provide a voltage output that is linearly proportional to the Celsius (Centigrade) temperature. The ADT45/ADT50 do not require any external calibration to provide typical accuracies of ± 1°C at +25°C and ± 2°C over the –40°C to +125°C temperature range. The low output impedance of the ADT45/ADT50, linear output and precise calibration simplify interfacing to temperature control circuitry and A/D converters. All three devices are intended for single supply operation from 2.7 V to 12 V maximum. Supply current runs well below 60 µA providing very low self-heating—less than 0.1°C in still air. The ADT45/ADT50 are functionally and pin compatible with LM45/LM50 respectively. The ADT45 provides a 250 mV output at +25°C and reads temperature from 0°C to +100°C. Th...