LM94023BITME NSC [National Semiconductor], LM94023BITME Datasheet

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LM94023BITME

Manufacturer Part Number
LM94023BITME
Description
1.5V, micro SMD, Dual-Gain Analog Temperature Sensor with Class AB Output
Manufacturer
NSC [National Semiconductor]
Datasheet

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© 2008 National Semiconductor Corporation
LM94023
1.5V, micro SMD, Dual-Gain Analog Temperature Sensor
with Class AB Output
General Description
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 mi-
croSMD 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 temper-
ature range of −50°C to +150°C, the LM94023 delivers an
output voltage that is inversely porportional to measured tem-
perature. 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 V
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
Connection Diagram
Cell phones
Wireless Transceivers
See NS Package Number TMD04AAA
micro SMD
Top View
300750
30075001
DD
Features
Key Specifications
Typical Transfer Characteristic
■ 
■ 
Accuracy
■ 
Temperature
Battery Management
Automotive
Disk Drives
Games
Appliances
Low 1.5V operation
Push-pull output with 50µA source current capability
Two selectable gains
Very accurate over wide temperature range of −50°C to
+150°C
Low quiescent current
Output is short-circuit protected
Extremely small microSMD 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
September 10, 2008
−50°C to 150°C
30075024
1.5V to 5.5V
www.national.com
5.4 μA (typ)
±50 μA
±1.5°C
±1.8°C
±2.1°C
±2.7°C

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LM94023BITME Summary of contents

Page 1

LM94023 1.5V, micro SMD, Dual-Gain Analog Temperature Sensor with Class AB Output General Description 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 ...

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 LM94023BITME ±1.5°C to ±2.7°C LM94023BITMX ±1.5°C to ±2.7°C Pin Descriptions Label Pin Number GS A1 Logic Input GND A2 Ground ...

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... DD ±7 mA Operating Ratings −0.3V to +6. Specified Temperature Range: −65°C to +150°C LM94023 Supply Voltage Range (V +150°C Thermal Resistance (θ LM94023BITME, LM94023BITMX 2500V Conditions = +20°C to +40° 1. +0°C to +70° 1. +0°C to +90° 1. +0°C to +120° ...

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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 ...

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Typical Performance Characteristics Temperature Error vs. Temperature Supply Current vs. Temperature Minimum Operating Temperature vs. Supply Voltage 30075007 Supply Current vs. Supply Voltage 30075004 5 30075006 30075005 www.national.com ...

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Load Regulation, Sourcing Current Line Regulation: Change in Vout vs. Overhead Voltage www.national.com Load Regulation, Sinking Current 30075040 Supply-Noise Gain vs. Frequency 30075042 6 30075041 30075043 ...

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LIne Regulation: Output Voltage vs. Supply Voltage Gain Select = 0 Line Regulation: Output Voltage vs. Supply Voltage Gain Select = 1 30075034 7 30075035 www.national.com ...

Page 8

LM94023 Transfer Function The LM94023 has two selectable gains, selected by the Gain Select (GS) input pin. The output voltage for each gain, across the complete operating temperature range is shown in the LM94023 Transfer Table, below. This table ...

Page 9

Temperature (°C) (mV) 36 838 37 832 38 827 39 821 40 816 41 810 42 804 43 799 44 793 45 788 46 782 47 777 48 771 49 766 50 760 51 754 52 749 ...

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Temperature (°C) (mV) 134 279 135 273 136 267 137 261 138 255 139 249 140 243 141 237 142 231 143 225 144 219 145 213 146 207 147 201 148 195 149 189 150 183 ...

Page 11

... LM94023 is required to drive. Figure 1 shows the thermal resistance of the LM94023. NS Package Device Number Number LM94023BITME, TMD04AAA LM94023BITMX FIGURE 1. LM94023 Thermal Resistance 3.0 Output and Noise Considerations A push-pull output gives the LM94023 the ability to sink and source significant current ...

Page 12

Selectable Gain for Optimization and In Situ Testing The Gain Select digital inputs can be tied to the rails or can be driven from digital outputs such as microcontroller GPIO pins. In low-supply voltage applications, the ability to reduce ...

Page 13

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 14

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 4-Bump Thin micro SMD Ball Grid Array Package Order Number LM94023BITME and LM94023BITMX NS Package Number TMD04AAA X1 = 0.815 0.815mm X3 = 0.600mm 14 ...

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Notes 15 www.national.com ...

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For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators ...

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