lm94022qbimg National Semiconductor Corporation, lm94022qbimg Datasheet

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lm94022qbimg

Manufacturer Part Number
lm94022qbimg
Description
1.5v, Sc70, Multi-gain Analog Temperature Sensor With Class-ab Output
Manufacturer
National Semiconductor Corporation
Datasheet
© 2007 National Semiconductor Corporation
LM94022
1.5V, SC70, Multi-Gain Analog Temperature Sensor with
Class-AB Output
General 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°C to +150°C, 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/°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 with a 1.5V supply while measuring temperature
over the full −50°C to +150°C operating range. Tying both
inputs high causes the transfer function to have the largest
gain of −13.6 mV/°C for maximum temperature sensitivity.
The gain-select inputs can be tied directly to V
without any pull-up or pull-down resistors, reducing compo-
nent count and board area. These inputs can also be driven
by logic signals allowing the system to optimize the gain dur-
ing operation or system diagnostics.
Applications
Connection Diagram
Cell phones
Wireless Transceivers
Battery Management
See NS Package Number MAA05A
Top View
SC70-5
20143001
201430
DD
or Ground
Features
Key Specifications
Typical Transfer Characteristic
■ 
■ 
Accuracy
■ 
Temperature
Automotive
Disk Drives
Games
Appliances
Low 1.5V operation
Push-pull output with 50µA source current capability
Four selectable gains
Very accurate over wide temperature range of −50°C to
+150°C
Low quiescent current
Output is short-circuit protected
Extremely small SC70 package
Footprint compatible with the industry-standard LM20
temperature sensor
Supply Current
Output Drive
Supply Voltage
Temperature
Operating
Output Voltage vs Temperature
-50°C to 150°C
-50°C to 70°C
-50°C to 90°C
20°C to 40°C
−50°C to 150°C
20143024
1.5V to 5.5V
www.national.com
5.4 μA (typ)
March 2007
±50 μA
±1.5°C
±1.8°C
±2.1°C
±2.7°C

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lm94022qbimg Summary of contents

Page 1

... Applications ■ Cell phones ■ Wireless Transceivers ■ Battery Management Connection Diagram SC70-5 Top View See NS Package Number MAA05A © 2007 National Semiconductor Corporation ■ Automotive ■ Disk Drives ■ Games ■ Appliances Features ■ Low 1.5V operation ■ ...

Page 2

Typical Application Full-Range Celsius Temperature Sensor (−50°C to +150°C) Operating from a Single Battery Cell Ordering Information Order Temperature Number Accuracy LM94022BIMG ±1.5°C to ±2.7°C LM94022BIMGX ±1.5°C to ±2.7°C Pin Descriptions Label Pin Type Numb er GS1 5 Logic Input ...

Page 3

Absolute Maximum Ratings Supply Voltage Voltage at Output Pin Output Current Voltage at GS0 and GS1 Input Pins Input Current at any pin (Note 2) Storage Temperature Maximum Junction Temperature (T ) JMAX ESD Susceptibility (Note 3) : Human Body ...

Page 4

Electrical Characteristics Unless otherwise noted, these specifications apply for + all other limits 25°C. MAX A J Symbol Parameter Sensor Gain Load Regulation (Note 10) Line Regulation (Note 13) I Supply Current S C ...

Page 5

Typical Performance Characteristics Temperature Error vs. Temperature Supply Current vs. Temperature Load Regulation, Sourcing Current Minimum Operating Temperature vs. Supply Voltage 20143007 Supply Current vs. Supply Voltage 20143004 Load Regulation, Sinking Current 20143040 5 20143006 20143005 20143041 www.national.com ...

Page 6

Change in Vout vs. Overhead Voltage Output Voltage vs. Supply Voltage Gain Select = 00 Output Voltage vs. Supply Voltage Gain Select = 10 www.national.com Supply-Noise Gain vs. Frequency 20143042 Output Voltage vs. Supply Voltage 20143034 Output Voltage vs. Supply ...

Page 7

LM94022 Transfer Function The LM94022 has four selectable gains, each of which can be selected by the GS1 and GS0 input pins. The output volt- age for each gain, across the complete operating temperature range is shown in the ...

Page 8

Temperat ure (mV) (mV) (°C) 35 843 1283 36 838 1275 37 832 1267 38 827 1258 39 821 1250 40 816 1242 41 810 1234 42 804 1225 43 799 1217 44 793 ...

Page 9

Temperat ure (mV) (mV) (mV) (°C) 131 296 469 642 132 291 460 630 133 285 452 618 134 279 443 607 135 273 434 595 136 267 425 584 137 ...

Page 10

Mounting and Thermal Conductivity The LM94022 can be applied easily in the same way as other integrated-circuit temperature sensors. It can be glued or ce- mented to a surface. To ensure good thermal conductivity, the backside of the LM94022 ...

Page 11

C. The larger gain is optimal for reducing the effects of noise (for example, noise coupling on the output line or quantization noise induced by an analog-to-digital converter ...

Page 12

Applications Circuits FIGURE 5. Conserving Power Dissipation with Shutdown Most CMOS ADCs found in microcontrollers and ASICs have a sampled data comparator input structure. When the ADC charges the sampling cap, it requires instantaneous charge from the output of ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted 5-Lead SC70 Molded Package Order Number LM94022BIMG, LM94022BIMGX NS Package Number MAA05A 13 www.national.com ...

Page 14

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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