The LM94023 is a precision analog output CMOS integrated-circuit temperature sensor that
operates at a supply voltage as low as 1.5 Volts. Available in the very small four-bump DSBGA 0.8mm
x 0.8mm) the LM94023 occupies very little board area. A class-AB output structure gives the LM94023
strong output source and sink current capability for driving heavy loads, making it well suited to
source the input of a sample-and-hold analog-to-digital converter with its transient load
requirements, This generally means the LM94023 can be used without external components, like
resistors and buffers, on the output. While operating over the wide temperature range of −50°C to
+150°C, the LM94023 delivers an output voltage that is inversely porportional to measured
temperature. The LM94023's low supply current makes it ideal for battery-powered systems as well as
general temperature sensing applications.
A Gain Select (GS) pin sets the gain of the temperature-to-voltage output transfer
function. Either of two slopes are selectable: −5.5 mV/°C (GS=0) or −8.2 mV/°C (GS=1). In the
lowest gain configuration, the LM94023 can operate with a 1.5V supply while measuring temperature
over the full −50°C to +150°C operating range. Tying GS high causes the transfer function to have
the largest gain for maximum temperature sensitivity. The gain-select inputs can be tied directly
to VDD 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.
