Dual-Gain Analog Temperature Sensor - National Semiconductor
Description
LM94023 1.
5V, micro SMD, Dual-Gain Analog Temperature Sensor with Class AB Output
September 10, 2008
LM94023 1.
5V, micro SMD, Dual-Gain Analog Temperature Sensor with Class AB Output
General Description
The LM94023 is a precision analog output CMOS integratedcircuit temperature sensor that operates at a supply voltage as low as 1.
5 Volts.
Available in the very small four-bump microSMD 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-tovoltage 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.
Applications
■ Cell phones ■ Wireless Transceivers
■ Battery Management ■ Automotive ■ Disk Drives ■ Games ■ Appliances
Features
■ Low 1.
5V operation ■ Push-pull output with 50µA source c...
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