LM34A National Semiconductor, LM34A Datasheet

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LM34A

Manufacturer Part Number
LM34A
Description
Precision Fahrenheit Temperature Sensors
Manufacturer
National Semiconductor
Datasheet

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C 1995 National Semiconductor Corporation
LM34 LM34A LM34C LM34CA LM34D
Precision Fahrenheit Temperature Sensors
General Description
The LM34 series are precision integrated-circuit tempera-
ture sensors whose output voltage is linearly proportional to
the Fahrenheit temperature The LM34 thus has an advan-
tage over linear temperature sensors calibrated in degrees
Kelvin as the user is not required to subtract a large con-
stant voltage from its output to obtain convenient Fahren-
heit scaling The LM34 does not require any external cali-
bration or trimming to provide typical accuracies of
room temperature and
temperature range Low cost is assured by trimming and
calibration at the wafer level The LM34’s low output imped-
ance linear output and precise inherent calibration make
interfacing to readout or control circuitry especially easy It
can be used with single power supplies or with plus and
minus supplies As it draws only 75 mA from its supply it has
very low self-heating less than 0 2 F in still air The LM34 is
rated to operate over a
range while the LM34C is rated for a
range (0 F with improved accuracy) The LM34 series is
available packaged in hermetic TO-46 transistor packages
Connection Diagrams
Typical Applications
TRI-STATE is a registered trademark of National Semiconductor Corporation
Order Numbers LM34H LM34AH
LM34CH LM34CAH or LM34DH
See NS Package Number H03H
Case is connected to negative pin (GND)
FIGURE 1 Basic Fahrenheit Temperature Sensor
Metal Can Package
TO-46
(
a
g
5 to
1
b
TL H 6685 – 1
TL H 6685
a
50 to
F over a full
300 F)
a
300 F temperature
b
b
40 to
50 to
See NS Package Number Z03A
TL H 6685 – 3
Order Number LM34CZ
LM34CAZ or LM34DZ
g
a
a
Plastic Package
300 F
230 F
F at
TO-92
while the LM34C LM34CA and LM34D are also available in
the plastic TO-92 transistor package The LM34D is also
available in an 8-lead surface mount small outline package
The LM34 is a complement to the LM35 (Centigrade) tem-
perature sensor
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
FIGURE 2 Full-Range Fahrenheit Temperature Sensor
Calibrated directly in degrees Fahrenheit
Linear
1 0 F accuracy guaranteed (at
Rated for full
Suitable for remote applications
Low cost due to wafer-level trimming
Operates from 5 to 30 volts
Less than 90 mA current drain
Low self-heating 0 18 F in still air
Nonlinearity only
Low-impedance output 0 4X for 1 mA load
TL H 6685 – 2
a
10 0 mV F scale factor
b
50 to
g
0 5 F typical
See NS Package Number M08A
Small Outline Molded Package
a
Order Number LM34DM
300 F range
N C
a
Top View
e
77 F)
No Connection
SO-8
RRD-B30M75 Printed in U S A
December 1994
TL H 6685 – 20
TL H 6685 – 4

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LM34A Summary of contents

Page 1

... LM34 LM34A LM34C LM34CA LM34D Precision Fahrenheit Temperature Sensors General Description The LM34 series are precision integrated-circuit tempera- ture sensors whose output voltage is linearly proportional to the Fahrenheit temperature The LM34 thus has an advan- tage over linear temperature sensors calibrated in degrees Kelvin as the user is not required to subtract a large con- ...

Page 2

... Figure 1 MAX 2 a 300 C a 260 C 215 C 220 MIN MAX 300 230 212 F LM34CA Tested Design Units Limit Limit (Max) (Note 4) (Note min max 116 139 117 142 230 F for the LM34C and Vdc for LM34 and LM34A for 230 F T ...

Page 3

DC Electrical Characteristics Parameter Conditions e a Accuracy LM34 LM34C (Note MAX MIN e a Accuracy LM34D ...

Page 4

Typical Performance Characteristics Thermal Resistance Junction to Air Thermal Response in Stirred Oil Bath Quiescent Current vs Temp- erature (In Circuit of Figure 100k) S Noise Voltage Thermal Response in Thermal Time ...

Page 5

Typical Applications The LM34 can be applied easily in the same way as other integrated-circuit temperature sensors It can be glued or cemented to a surface and its temperature will be within about the surface temperature ...

Page 6

Typical Applications (Continued) Two-Wire Remote Temperature Sensor (Grounded Sensor) V OUT FROM 4-to-20 mA Current Source 100 F) Expanded Scale Thermometer ( Fahrenheit for Example Shown) Two-Wire Remote Temperature Sensor (Output Referred to Ground) e ...

Page 7

Typical Applications (Continued) LM34 with Voltage-to-Frequency Converter and Isolated Output 300 3000 Hz) Bar-Graph Temperature Display (Dot Mode film resistor e Trim R for V 3 525V B ...

Page 8

Typical Applications (Continued) (Parallel TRI-STATE Outputs for Standard Data Bus to mP Interface 128 F Full Scale) Block Diagram Temperature-to-Digital Converter Temperature Controller 6685 – 6685 – 6685 – 19 ...

Page 9

... Physical Dimensions inches (millimeters) Order Number LM34H LM34AH LM34CH LM34CAH or LM34DH NS Package H03H Order Number LM34DM NS Package Number M08A 9 ...

Page 10

... National Semiconductor National Semiconductor National Semiconductores Japan Ltd Hong Kong Ltd Do Brazil Ltda Sumitomo Chemical 13th Floor Straight Block ...

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