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參數(shù)資料
| 型號： | LM45 |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 214K |
| 代理商： | LM45 |
LM45
SOT-23 Precision Centigrade Temperature Sensors
General Description
The LM45 series are precision integrated-circuit temperature
sensors, whose output voltage is linearly proportional to the
Celsius (Centigrade) temperature. The LM45 does not re-
quire any external calibration or trimming to provide accura-
cies of
±
2C at room temperature and
±
3C over a full 20 to
+100C temperature range. Low cost is assured by trimming
and calibration at the wafer level. The LM45’s low output im-
pedance, linear output, and precise inherent calibration
make interfacing to readout or control circuitry especially
easy. It can be used with a single power supply, or with plus
and minus supplies. As it draws only 120 μA from its supply,
it has very low self-heating, less than 0.2C in still air. The
LM45 is rated to operate over a 20 to +100C temperature
range.
Applications
n
Battery Management
n
FAX Machines
n
Printers
n
Portable Medical Instruments
n
HVAC
n
Power Supply Modules
n
Disk Drives
n
Computers
n
Automotive
Features
n
Calibrated directly in Celsius (Centigrade)
n
Linear + 10.0 mV/C scale factor
n
±
3C accuracy guaranteed
n
Rated for full 20 to +100C range
n
Suitable for remote applications
n
Low cost due to wafer-level trimming
n
Operates from 4.0V to 10V
n
Less than 120 μA current drain
n
Low self-heating, 0.20C in still air
n
Nonlinearity only
±
0.8C max over temp
n
Low impedance output, 20
for 1 mA load
Connection Diagram
SOT-23
Device
Marking
T4B
T4B
T4C
T4C
Order
Number
LM45BIM3
LM45BIM3X
LM45CIM3
LM45CIM3X
Supplied As
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
Typical Applications
SOT-23
DS011754-1
Top View
See NS Package Number MA03B
DS011754-3
FIGURE 1. Basic Centigrade Temperature
Sensor (+2.5C to +100C)
DS011754-4
Choose R
1
= V
S
/50 μA
V
OUT
= (10 mV/C x Temp C)
V
OUT
= +1,000 mV at +100C
= +250 mV at +25C
= 200 mV at 20C
FIGURE 2. Full-Range Centigrade
Temperature Sensor (20C to +100C)
August 1999
L
2000 National Semiconductor Corporation
DS011754
www.national.com
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