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LM94022BIMG-LM94022BIMGX
1.5V, SC70, Multi-Gain Analog Temperature Sensor with Class-AB Output
LM94022
1.5V, SC70, Multi-Gain Analog Temperature Sensor with
Class-AB Output
General DescriptionThe LM94022isa precision analog output CMOS
integrated-circuit temperature sensor that operatesata sup-
ply voltageas lowas 1.5 Volts.A class-AB output structure
gives the LM94022 strong output source and sink current
capabilityfor driving heavy loads. For example,itis well
suitedto source the inputofa sample-and-hold analog-to-
digital converter withits transient load requirements. While
operating over the wide temperature rangeof −50˚Cto
+150˚C, the LM94022 deliversan output voltage thatis
inversely porportional to measured temperature. The
LM94022’s low supply current makesit idealfor battery-
powered systemsas wellas general temperature sensing
applications.
Two logic inputs, Gain Select1 (GS1) and Gain Select0
(GS0), selectthe gainofthe temperature-to-voltage output
transfer function. Four slopes are selectable: −5.5 mV/˚C,
−8.2 mV/˚C, −10.9 mV/˚C, and −13.6 mV/˚C.In the lowest
gain configuration (GS1 and GS0 both tied low), the
LM94022 can operate witha 1.5V supply while measuring
temperature over thefull −50˚Cto +150˚C operating range.
Tying both inputs high causes the transfer functionto have
the largest gainof −13.6 mV/˚Cfor maximum temperature
sensitivity. The gain-select inputs canbe tied directlyto VDD Ground without any pull-upor pull-down resistors, reduc-
ing component count and board area. These inputs can also drivenby logic signals allowingthe systemto optimizethe
gain during operationor 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 current capability Four selectable gains Very accurate over wide temperature rangeof −50˚Cto
+150˚C Low quiescent current Outputis short-circuit protected Extremely small SC70 package Footprint compatible with the industry-standard LM20
temperature sensor
Key Specifications Supply Voltage 1.5Vto 5.5V Supply Current 5.4µA (typ) Output Drive ±50µA Temperature
Accuracy
20˚Cto 40˚C
-50˚Cto 70˚C
-50˚Cto 90˚C
-50˚Cto 150˚C
±1.5˚C
±1.8˚C
±2.1˚C
±2.7˚C Operating
Temperature −50˚Cto 150˚C
Connection Diagram
SC70-5Top View
See NS Package Number MAA05A
Typical Transfer Characteristic
Output Voltagevs Temperature
May 2005
LM94022
1.5V
SC70,
Multi-Gain
Analog
emperature
Sensor
with
Class-AB
Output
