LM34CH [NSC]

Precision Fahrenheit Temperature Sensors; 精密华氏温度传感器
LM34CH
型号: LM34CH
厂家: National Semiconductor    National Semiconductor
描述:

Precision Fahrenheit Temperature Sensors
精密华氏温度传感器

传感器 温度传感器
文件: 总12页 (文件大小:251K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
July 1999  
LM34  
Precision Fahrenheit Temperature Sensors  
hermetic TO-46 transistor packages, 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 comple-  
ment to the LM35 (Centigrade) temperature sensor.  
General Description  
The LM34 series are precision integrated-circuit temperature  
sensors, whose output voltage is linearly proportional to the  
Fahrenheit temperature. The LM34 thus has an advantage  
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 Fahrenheit  
Features  
n Calibrated directly in degrees Fahrenheit  
n Linear +10.0 mV/˚F scale factor  
n 1.0˚F accuracy guaranteed (at +77˚F)  
n Rated for full −50˚ to +300˚F range  
n Suitable for remote applications  
n Low cost due to wafer-level trimming  
n Operates from 5 to 30 volts  
scaling. The LM34 does not require any external calibration  
1
±
or trimming to provide typical accuracies of  
2
˚F at room  
1
±
temperature and 1 ⁄ ˚F over a full −50 to +300˚F tempera-  
2
ture range. Low cost is assured by trimming and calibration  
at the wafer level. The LM34’s low output impedance, 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 µA 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 −50˚ to +300˚F temperature range, while the  
LM34C is rated for a −40˚ to +230˚F range (0˚F with im-  
proved accuracy). The LM34 series is available packaged in  
n Less than 90 µA current drain  
n Low self-heating, 0.18˚F in still air  
±
n Nonlinearity only 0.5˚F typical  
n Low-impedance output, 0.4for 1 mA load  
Connection Diagrams  
TO-46  
Metal Can Package  
TO-92  
Plastic Package  
SO-8  
Small Outline  
Molded Package  
(Note 1)  
DS006685-2  
DS006685-1  
Order Number LM34CZ,  
LM34CAZ or LM34DZ  
See NS Package  
Order Numbers LM34H,  
LM34AH, LM34CH,  
LM34CAH or LM34DH  
See NS Package  
DS006685-20  
=
N.C. No Connection  
Number Z03A  
Top View  
Order Number LM34DM  
Number H03H  
See NS Package Number M08A  
Note 1: Case is connected to negative pin (GND).  
TRI-STATE® is a registered trademark of National Semiconductor Corporation.  
© 1999 National Semiconductor Corporation  
DS006685  
www.national.com  
Typical Applications  
DS006685-3  
FIGURE 1. Basic Fahrenheit Temperature Sensor  
(+5˚ to +300˚F)  
DS006685-4  
FIGURE 2. Full-Range Fahrenheit Temperature Sensor  
www.national.com  
2
Absolute Maximum Ratings (Note 11)  
If Military/Aerospace specified devices are required,  
please contact the National Semiconductor Sales Office/  
Distributors for availability and specifications.  
TO-46 Package  
(Soldering, 10 seconds)  
TO-92 Package  
+300˚C  
+260˚C  
(Soldering, 10 seconds)  
SO Package (Note 13)  
Vapor Phase (60 seconds)  
Infrared (15 seconds)  
Supply Voltage  
+35V to −0.2V  
+6V to −1.0V  
10 mA  
215˚C  
220˚C  
Output Voltage  
Output Current  
Specified Operating Temp. Range (Note 3)  
Storage Temperature,  
TO-46 Package  
TO-92 Package  
SO-8 Package  
TMIN to TMAX  
−50˚F to +300˚F  
−40˚F to +230˚F  
+32˚F to +212˚F  
−76˚F to +356˚F  
−76˚F to +300˚F  
−65˚C to +150˚C  
800V  
LM34, LM34A  
LM34C, LM34CA  
LM34D  
ESD Susceptibility (Note 12)  
Lead Temp.  
DC Electrical Characteristics (Notes 2, 7)  
LM34A  
LM34CA  
Tested  
Limit  
Parameter  
Conditions  
Tested  
Limit  
Design  
Limit  
Design  
Units  
(Max)  
Typical  
Typical  
Limit  
(Note 5)  
(Note 6)  
(Note 5)  
(Note 6)  
=
±
±
±
±
±
±
±
±
±
±
Accuracy (Note 8)  
TA +77˚F  
0.4  
0.6  
0.8  
0.8  
1.0  
0.4  
0.6  
0.8  
0.8  
1.0  
˚F  
˚F  
=
±
TA 0˚F  
2.0  
=
±
±
±
TA TMAX  
2.0  
2.0  
2.0  
˚F  
=
±
TA TMIN  
3.0  
˚F  
±
±
±
±
Nonlinearity (Note 9)  
Sensor Gain  
TMIN TA TMAX  
TMIN TA TMAX  
0.35  
0.7  
0.30  
0.6  
˚F  
+10.0  
+9.9,  
+10.0  
+9.9,  
mV/˚F, min  
mV/˚F, max  
mV/mA  
mV/mA  
(Average Slope)  
Load Regulation  
(Note 4)  
+10.1  
+10.1  
=
±
±
±
±
TA +77˚F  
0.4  
1.0  
0.4  
1.0  
±
±
±
±
±
±
TMIN TA TMAX  
0 IL 1 mA  
0.5  
3.0  
0.1  
0.5  
3.0  
0.1  
=
±
±
±
±
Line Regulation  
(Note 4)  
TA +77˚F  
0.01  
0.02  
75  
0.05  
90  
0.01  
0.02  
75  
0.05  
90  
mV/V  
mV/V  
µA  
±
±
5V VS 30V  
=
VS +5V, +77˚F  
Quiescent Current  
(Note 10)  
=
VS +5V  
131  
76  
160  
163  
116  
76  
139  
142  
µA  
=
VS +30V, +77˚F  
92  
92  
µA  
=
VS +30V  
132  
117  
0.5  
µA  
Change of Quiescent  
Current (Note 4)  
4V VS 30V, +77˚F  
5V VS 30V  
+0.5  
+1.0  
+0.30  
2.0  
2.0  
µA  
3.0  
1.0  
3.0  
µA  
Temperature Coefficient  
of Quiescent Current  
Minimum Temperature  
for Rated Accuracy  
Long-Term Stability  
+0.5  
+0.30  
+0.5  
µA/˚F  
In circuit of Figure 1,  
+3.0  
+5.0  
+3.0  
+5.0  
˚F  
˚F  
=
=
IL  
0
±
±
0.16  
Tj TMAX  
0.16  
for 1000 hours  
Note 2: Unless otherwise noted, these specifications apply: −50˚F T + 300˚F for the LM34 and LM34A; −40˚F T +230˚F for the LM34C and LM34CA; and  
j
j
=
=
+32˚F T + 212˚F for the LM34D. V  
+5 Vdc and I  
50 µA in the circuit of Figure 2; +6 Vdc for LM34 and LM34A for 230˚F T 300˚F. These specifications  
j
S
LOAD  
j
also apply from +5˚F to T  
MAX  
in the circuit of Figure 1.  
Note 3: Thermal resistance of the TO-46 package is 720˚F/W junction to ambient and 43˚F/W junction to case. Thermal resistance of the TO-92 package is 324˚F/W  
junction to ambient. Thermal resistance of the small outline molded package is 400˚F/W junction to ambient. For additional thermal resistance information see table  
in the Typical Applications section.  
Note 4: Regulation is measured at constant junction temperature using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed  
by multiplying the internal dissipation by the thermal resistance.  
Note 5: Tested limits are guaranteed and 100% tested in production.  
Note 6: Design limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges. These limits are not used to cal-  
culate outgoing quality levels.  
Note 7: Specification in BOLDFACE TYPE apply over the full rated temperature range.  
3
www.national.com  
DC Electrical Characteristics (Notes 2, 7) (Continued)  
Note 8: Accuracy is defined as the error between the output voltage and 10 mV/˚F times the device’s case temperature at specified conditions of voltage, current,  
and temperature (expressed in ˚F).  
Note 9: Nonlinearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line over the device’s rated temperature  
range.  
Note 10: Quiescent current is defined in the circuit of Figure 1.  
Note 11: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating  
the device beyond its rated operating conditions (Note 2).  
Note 12: Human body model, 100 pF discharged through a 1.5 kresistor.  
Note 13: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National Semicon-  
ductor Linear Data Book for other methods of soldering surface mount devices.  
DC Electrical Characteristics (Notes 2, 7)  
LM34  
Tested  
Limit  
LM34C, LM34D  
Parameter  
Conditions  
Design  
Limit  
Tested  
Limit  
Design  
Limit  
Units  
(Max)  
Typical  
Typical  
(Note 5)  
(Note 6)  
(Note 5) (Note 6)  
=
±
±
±
±
±
±
±
±
±
±
±
±
±
±
Accuracy, LM34, LM34C TA +77˚F  
0.8  
1.0  
1.6  
1.6  
2.0  
0.8  
1.0  
1.6  
1.6  
1.2  
1.8  
1.8  
0.4  
2.0  
˚F  
=
±
±
±
(Note 8)  
TA 0˚F  
3.0  
3.0  
4.0  
˚F  
=
±
TA TMAX  
3.0  
˚F  
=
±
TA TMIN  
3.0  
˚F  
˚F  
=
±
Accuracy, LM34D  
(Note 8)  
TA +77˚F  
3.0  
=
±
±
±
TA TMAX  
4.0  
4.0  
1.0  
˚F  
=
TA TMIN  
˚F  
±
±
Nonlinearity (Note 9)  
Sensor Gain  
TMIN TA TMAX  
TMIN TA TMAX  
0.6  
1.0  
˚F  
+10.0  
+9.8,  
+10.0  
+9.8,  
mV/˚F, min  
mV/˚F, max  
mV/mA  
mV/mA  
(Average Slope)  
Load Regulation  
(Note 4)  
+10.2  
+10.2  
=
±
±
±
±
±
TA +77˚F  
0.4  
2.5  
0.4  
2.5  
0.1  
±
±
±
±
±
±
TMIN TA +150˚F  
0 IL 1 mA  
0.5  
6.0  
0.2  
0.5  
6.0  
0.2  
=
±
±
±
Line Regulation  
(Note 4)  
TA +77˚F  
0.01  
0.02  
75  
0.1  
0.01  
0.02  
75  
mV/V  
mV/V  
µA  
±
±
5V VS 30V  
=
Quiescent Current  
(Note 10)  
VS +5V, +77˚F  
100  
103  
3.0  
100  
103  
3.0  
=
VS +5V  
131  
76  
176  
181  
116  
76  
154  
159  
µA  
=
VS +30V, +77˚F  
µA  
=
VS +30V  
132  
117  
0.5  
µA  
Change of Quiescent  
Current (Note 4)  
4V VS 30V, +77˚F  
5V VS 30V  
+0.5  
+1.0  
+0.30  
µA  
5.0  
1.0  
5.0  
µA  
Temperature Coefficient  
of Quiescent Current  
Minimum Temperature  
for Rated Accuracy  
Long-Term Stability  
+0.7  
+0.30  
+0.7  
µA/˚F  
In circuit of Figure 1,  
+3.0  
+5.0  
+3.0  
+5.0  
˚F  
˚F  
=
=
IL  
0
±
±
0.16  
Tj TMAX  
0.16  
for 1000 hours  
www.national.com  
4
Typical Performance Characteristics  
Thermal Resistance  
Junction to Air  
Thermal Response in  
Still Air  
Thermal Time Constant  
DS006685-23  
DS006685-24  
DS006685-22  
Thermal Response in  
Stirred Oil Bath  
Minimum Supply Voltage  
vs. Temperature  
Quiescent Current vs.  
Temperature  
(In Circuit of Figure 1)  
DS006685-25  
DS006685-26  
DS006685-27  
Quiescent Current vs. Temp-  
erature (In Circuit of Figure 2;  
Accuracy vs. Temperature  
(Guaranteed)  
Accuracy vs. Temperature  
(Guaranteed)  
=
=
−VS −5V, R1 100k)  
DS006685-29  
DS006685-30  
DS006685-28  
5
www.national.com  
Typical Performance Characteristics (Continued)  
Noise Voltage  
Start-Up Response  
DS006685-31  
DS006685-32  
and speed up the response in slowly-moving air. On the  
other hand, a small thermal mass may be added to the sen-  
sor to give the steadiest reading despite small deviations in  
the air temperature.  
Typical Applications  
The LM34 can be applied easily in the same way as other  
integrated-circuit temperature sensors. It can be glued or ce-  
mented to a surface and its temperature will be within about  
0.02˚F of the surface temperature. This presumes that the  
ambient air temperature is almost the same as the surface  
temperature; if the air temperature were much higher or  
lower than the surface temperature, the actual temperature  
of the LM34 die would be at an intermediate temperature be-  
tween the surface temperature and the air temperature. This  
is expecially true for the TO-92 plastic package, where the  
copper leads are the principal thermal path to carry heat into  
the device, so its temperature might be closer to the air tem-  
perature than to the surface temperature.  
Capacitive Loads  
Like most micropower circuits, the LM34 has a limited ability  
to drive heavy capacitive loads. The LM34 by itself is able to  
drive 50 pF without special precautions. If heavier loads are  
anticipated, it is easy to isolate or decouple the load with a  
resistor; see Figure 3. Or you can improve the tolerance of  
capacitance with  
a series R-C damper from output to  
ground; see Figure 4. When the LM34 is applied with a 499Ω  
load resistor (as shown), it is relatively immune to wiring ca-  
pacitance because the capacitance forms a bypass from  
ground to input, not on the output. However, as with any lin-  
ear circuit connected to wires in a hostile environment, its  
performance can be affected adversely by intense electro-  
magnetic sources such as relays, radio transmitters, motors  
with arcing brushes, SCR’s transients, etc., as its wiring can  
act as a receiving antenna and its internal junctions can act  
as rectifiers. For best results in such cases, a bypass capaci-  
tor from VIN to ground and a series R-C damper such as 75Ω  
in series with 0.2 or 1 µF from output to ground are often  
useful. These are shown in the following circuits.  
To minimize this problem, be sure that the wiring to the  
LM34, as it leaves the device, is held at the same tempera-  
ture as the surface of interest. The easiest way to do this is  
to cover up these wires with a bead of epoxy which will in-  
sure that the leads and wires are all at the same temperature  
as the surface, and that the LM34 die’s temperature will not  
be affected by the air temperature.  
The TO-46 metal package can also be soldered to a metal  
surface or pipe without damage. Of course in that case, the  
V
terminal of the circuit will be grounded to that metal. Alter-  
natively, the LM34 can be mounted inside a sealed-end  
metal tube, and can then be dipped into a bath or screwed  
into a threaded hole in a tank. As with any IC, the LM34 and  
accompanying wiring and circuits must be kept insulated and  
dry, to avoid leakage and corrosion. This is especially true if  
the circuit may operate at cold temperatures where conden-  
sation can occur. Printed-circuit coatings and varnishes such  
as Humiseal and epoxy paints or dips are often used to in-  
sure that moisture cannot corrode the LM34 or its connec-  
tions.  
DS006685-6  
These devices are sometimes soldered to  
a small,  
light-weight heat fin to decrease the thermal time constant  
www.national.com  
6
Typical Applications  
DS006685-7  
FIGURE 3. LM34 with Decoupling from Capacitive Load  
DS006685-8  
FIGURE 4. LM34 with R-C Damper  
Temperature Rise of LM34 Due to Self-Heating (Thermal Resistance)  
Conditions  
TO-46,  
No Heat  
Sink  
TO-46,  
Small Heat Fin  
(Note 14)  
180˚F/W  
TO-92,  
No Heat  
Sink  
TO-92,  
Small Heat Fin  
(Note 15)  
252˚F/W  
SO-8  
No Heat  
Sink  
SO-8  
Small Heat Fin  
(Note 15)  
Still air  
720˚F/W  
180˚F/W  
180˚F/W  
90˚F/W  
324˚F/W  
162˚F/W  
162˚F/W  
81˚F/W  
400˚F/W  
190˚F/W  
200˚F/W  
Moving air  
72˚F/W  
126˚F/W  
160˚F/W  
Still oil  
72˚F/W  
126˚F/W  
Stirred oil  
54˚F/W  
72˚F/W  
(Clamped to metal,  
infinite heat sink)  
(43˚F/W)  
(95˚F/W)  
Note 14: Wakefield type 201 or 1" disc of 0.020" sheet brass, soldered to case, or similar.  
Note 15: TO-92 and SO-8 packages glued and leads soldered to 1" square of 1/16" printed circuit board with 2 oz copper foil, or similar.  
Two-Wire Remote Temperature Sensor  
(Grounded Sensor)  
Two-Wire Remote Temperature Sensor  
(Output Referred to Ground)  
DS006685-9  
DS006685-10  
=
V
10mV/˚F (T +3˚F)  
A
OUT  
FROM +3˚F TO + 100˚F  
7
www.national.com  
Typical Applications (Continued)  
4-to-20 mA Current Source  
(0 to +100˚F)  
Fahrenheit Thermometer  
(Analog Meter)  
DS006685-12  
DS006685-11  
Expanded Scale Thermometer  
(50˚ to 80˚ Fahrenheit, for Example Shown)  
Temperature-to-Digital Converter  
(Serial Output, +128˚F Full Scale)  
DS006685-14  
DS006685-13  
LM34 with Voltage-to-Frequency Converter and Isolated Output  
(3˚F to + 300˚F; 30 Hz to 3000 Hz)  
DS006685-15  
www.national.com  
8
Typical Applications (Continued)  
Bar-Graph Temperature Display  
(Dot Mode)  
DS006685-16  
=
*
1
%
or 2 film resistor  
%
=
=
=
— Trim R for V  
3.525V  
2.725V  
B
B
— Trim R for V  
C
C
— Trim R for V  
0.085V + 40 mV/˚F x T  
AMBIENT  
A
A
=
— Example, V  
3.285V at 80˚F  
A
Temperature-to-Digital Converter  
(Parallel TRI-STATE® Outputs for Standard Data Bus to µP Interface, 128 ˚F Full Scale)  
DS006685-17  
9
www.national.com  
Typical Applications (Continued)  
Temperature Controller  
DS006685-18  
Block Diagram  
DS006685-19  
www.national.com  
10  
Physical Dimensions inches (millimeters) unless otherwise noted  
Order Number LM34H, LM34AH, LM34CH,  
LM34CAH or LM34DH  
NS Package H03H  
Order Number LM34DM  
NS Package Number M08A  
11  
www.national.com  
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)  
Order Number LM34CZ, LM34CAZ or LM34DZ  
NS Package Z03A  
LIFE SUPPORT POLICY  
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT  
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL  
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:  
1. Life support devices or systems are devices or  
systems which, (a) are intended for surgical implant  
into the body, or (b) support or sustain life, and  
whose failure to perform when properly used in  
accordance with instructions for use provided in the  
labeling, can be reasonably expected to result in a  
significant injury to the user.  
2. A critical component is any component of a life  
support device or system whose failure to perform  
can be reasonably expected to cause the failure of  
the life support device or system, or to affect its  
safety or effectiveness.  
National Semiconductor  
Corporation  
Americas  
Tel: 1-800-272-9959  
Fax: 1-800-737-7018  
Email: support@nsc.com  
National Semiconductor  
Europe  
National Semiconductor  
Asia Pacific Customer  
Response Group  
Tel: 65-2544466  
Fax: 65-2504466  
National Semiconductor  
Japan Ltd.  
Tel: 81-3-5639-7560  
Fax: 81-3-5639-7507  
Fax: +49 (0) 1 80-530 85 86  
Email: europe.support@nsc.com  
Deutsch Tel: +49 (0) 1 80-530 85 85  
English Tel: +49 (0) 1 80-532 78 32  
Français Tel: +49 (0) 1 80-532 93 58  
Italiano Tel: +49 (0) 1 80-534 16 80  
Email: sea.support@nsc.com  
www.national.com  
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.  

相关型号:

LM34CH/NOPB

Analog Temperature Sensor, ANALOG TEMP SENSOR-VOLTAGE, -.5-3V, ROUND, THROUGH HOLE MOUNT, HERMETIC SEALED, METAL CAN, TO-46, 3 PIN
TI

LM34CZ

Precision Fahrenheit Temperature Sensors
NSC

LM34CZ/NOPB

带华氏刻度的 ±1°F 5V 至 30V 模拟输出温度传感器 | LP | 3 | -40 to 110
TI

LM34D

Precision Fahrenheit Temperature Sensors
NSC

LM34DH

Precision Fahrenheit Temperature Sensors
NSC

LM34DH

带华氏刻度的 ±1°F 5V 至 30V 模拟输出温度传感器 | NDV | 3 | 0 to 100
TI

LM34DH/NOPB

Analog Temperature Sensor, ANALOG TEMP SENSOR-VOLTAGE, -.5-3V, ROUND, THROUGH HOLE MOUNT, HERMETIC SEALED, METAL CAN, TO-46, 3 PIN
NSC

LM34DH/NOPB

带华氏刻度的 ±1°F 5V 至 30V 模拟输出温度传感器 | NDV | 3 | 0 to 100
TI

LM34DM

Precision Fahrenheit Temperature Sensors
NSC

LM34DM

带华氏刻度的 ±1°F 5V 至 30V 模拟输出温度传感器 | D | 8 | 0 to 100
TI

LM34DM/NOPB

Analog Temperature Sensor, ANALOG TEMP SENSOR-VOLTAGE, -.5-3V, RECTANGULAR, SURFACE MOUNT, PLASTIC, SOP-8
NSC

LM34DM/NOPB

带华氏刻度的 ±1°F 5V 至 30V 模拟输出温度传感器 | D | 8 | 0 to 100
TI