LM94022 1.5V, SC70, Multi-Gain Analog Temperature Sensor with Class-AB Output from the PowerWise® Family

Description

The LM94022 is a precision analog output CMOS integrated-circuit temperature sensor that operates at a supply voltage as low as 1.5 Volts. A class-AB output structure gives the LM94022 strong output source and sink current capability for driving heavy loads. For example, it is well suited to source the input of a sample-and-hold analog-to-digital converter with its transient load requirements. While operating over the wide temperature range of −50¡ãC to +150¡ãC, the LM94022 delivers an output voltage that is inversely porportional to measured temperature. The LM94022's low supply current makes it ideal for battery-powered systems as well as general temperature sensing applications.

Two logic inputs, Gain Select 1 (GS1) and Gain Select 0 (GS0), select the gain of the temperature-to-voltage output transfer function. Four slopes are selectable: −5.5 mV/¡ãC, −8.2 mV/¡ãC, −10.9 mV/¡ãC, and −13.6 mV/¡ãC. In the lowest gain configuration (GS1 and GS0 both tied low), the LM94022 can operate with a 1.5V supply while measuring temperature over the full −50¡ãC to +150¡ãC operating range. Tying both inputs high causes the transfer function to have the largest gain of −13.6 mV/¡ãC for maximum temperature sensitivity. The gain-select inputs can be tied directly to V_DD or Ground without any pull-up or pull-down resistors, reducing component count and board area. These inputs can also be driven by logic signals allowing the system to optimize the gain during operation or system diagnostics.

Key Specification

Applications