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LM135 LM235-LM335,A
PRECISION TEMPERATURE SENSORS
.DI .1 .OPERATESFROM450ATO5mA .LESSTHAN1DYNAMI
RECTLY CALIBRATED IN oK o C INITIAL ACCURACY
C IMPEDANCE
Z TO92 (Plastic Package
DESCRIPTION The LM135, LM235, LM335 are precision temperature sensors which can be easily calibrated. They operate as a 2-terminal Zener and the breakdown voltage is directly proportional to the absolute temperature at 10mV/oK. The circuit has a dynamic impedance of less than 1 and operates within a range of current from 450A to 5mA without alteration of its characteristics. Calibrated at +25oC, the LM135, LM235, LM335 have a typical error of less than 1oC over a 100oC temperature range. Unlike other sensors, the LM135, LM235, LM335 have a linear output. PIN CONNECTIONS
TO92 (Bottom view)
V+ 8
D SO8 (Plastic Micropackage)
ORDER CODES
Part number LM135 LM235 LM335,A Temperature Range -55 C, +150 C -40 C, +125 C -40 C, +100 C
o o o o o o
Package Z * * * D * * *
SO8 (Top view)
NC 7 NC 6 ADJ 5
ADJ
V+
V-
135-01.EPS
1 NC
2 NC
3 NC
4 V
October 1997
135-02.EPS
LM135-LM235-LM335,A
SCHEMATIC DIAGRAM
1V 50k
49k
49k
15.6k
3 pF
10k
1 2pF
60 0 30k
2 AD J
13.8k
2 k
1.1k
3V
ABSOLUTE MAXIMUM RATINGS
Symbol IR IF Toper Current Reverse Forward Operating Free-air Temperature Range - (note 1) Continuous Intermittent Storage Temperature Range
o
Parameter
LM135 15 10 -55 to +150 +150 to +200 -65 to +150
LM235 15 10 -40 to +125 +125 to +150 -65 to +150
LM335,A 15 10
Unit mA
o
C
-40 to +100 +100 to +125 -65 to +150
o
Tstg
C
Note : 1. Tj 150 C
2/11
LM135-LM235-LM335,A
TEMPERATURE ACCURACY
Parameter Operating Output Voltage Tcase = +25oC, IR = 1mA Uncalibrated Temperature Error (IR = 1mA) o Tcase = +25 C Tmin. Tcase Tmax. Temperature Error with 25 C Calibration Tmin. Tcase Tmax., IR = 1mA LM135 - LM235 LM335 LM335A Calibrated Error at Extended Temperature Tcase = Tmax. (intermittent) Non-linearity (IR = 1mA) LM135 - LM235 LM335 LM335A
o
LM135 - LM235 LM335A Min. 2.95 Typ. 2.98 1 2 0.5 0.5 2 0.3 0.3 1 Max. 3.01 3 5 1.5 Min. 2.92
LM335 Typ. 2.98 2 4 Max.
Unit V 3.04
o
C
6 9
o
C
1 1
2
o
C C
2
o
0.3 1.5
1.5
ELECTRICAL CHARACTERISTICS - (note 1)
Parameter Operating output voltage change with current 450A IR 5mA at constant temperature Dynamic Impedance (IR = 1mA) Output Voltage Temperature Drift Time Constant
o
LM135 - LM235 Min. Typ. 2.5 0.5 +10 Still Air Air 0.5m/s Stirred Oil 80 10 1 0.2 Max. 10 Min.
LM335,A Typ. 3 0.6 +10 80 10 1 0.2
o
Max. 14
Unit mV mV/ C s
o
Time Stability (Tcase = +125 C)
C/kh
Note : 1. Accuracy measurements are made in a well-stirred oil bath. For other conditions, self heating must be considered.
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LM135-LM235-LM335,A
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LM135-LM235-LM335,A
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LM135-LM235-LM335,A
APPLICATION HINTS There is an easy method of calibrating the device for higher accuracies (see typical applications). The single point calibration works because the output of the LM135, LM235, LM335 is proportional to the absolute temperature with the extrapolated output of sensor going to 0V at 0oK ( -273.15oC). Errors in outputvoltage versus temperature are only slope. Thus a calibration of the slope at one temperature corrects errors at all temperatures. The output of the circuit (calibrated or not) can be T given by the equation : VOT = VOTO x To where T is the unknown temperature and TO is the reference temperature (in oK). TYPICAL APPLICATIONS BASIC TEMPERATURE SENSOR Nominally the output is calibrated at 10mV/oK. Precautions should be taken to ensure good sensing accuracy. As in the case ofall temperaturessensors, self heating can decrease accuracy. The LM135, LM235, LM335 should operate with a low current, but sufficient to drive the sensor and its calibration circuit to their maximum operating temperature. If the sensor is used in surroundings where the thermal resistane is constant,the errors due to self heating can be externally calibrated. This is possible if the circuit is biased with a temperature stable current. Heating will then be proportional to zener voltage and therefore temperature. In this way the error due to self heating is proportional to the absolute temperature as scale factor errors.
WIDE OPERATING SUPPLY
Vi +5 to +40V LM134, LM234 LM334
V R1 LM135 LM235 LM335 Output 10mV/K
68 LM135 LM235 LM335 Output 10mV/K
CALIBRATED SENSOR
AVERAGE TEMPERATURE SENSING
+15V 6k
V R1 Output 10mV/K LM135 LM235 LM335 10k*
Output 30mV/K LM135 LM235 LM335
* Calibrate for 2.982V at +25oC
6/11
LM135-LM235-LM335,A
ISOLATED TEMPERATURE SENSOR
LM135 LM235 LM335 +15V 50k 3k 01.F 3 1k 2 4 8 LM311 1 10k 5 6 7 1N4148 200pF 27k 100k 1000pF 510 10k 1 3 LF398 84 5 6 7 Output 10mV/K 2k m=1 +15V 1N457 0.1F
-15V
1N4148 -15V
SIMPLE TEMPERATURE CONTROLLER
+10V to +30V 2k
10k
5k
2 5 6
10k
Heater
0.01F 1N4568 10k
3 1
8 4
LM311
7
BUV26
4k
LM135 LM235 LM335
7/11
LM135-LM235-LM335,A
CENTIGRADE THERMOMETER
1k +15V +15V 6k
2 7
+15V 12k
6
3 4
8
8.5k LM136 2k *
LM135 LM235 LM335
10k
100pF
* Adjust for 2.7315V at output of LM308
DIFFERENTIAL TEMPERATURE SENSOR
+15V
12k
12k 20k
2
200k +15V
7 6 8 4
LM308 20k
3
Output 100mV/C
180k LM135 LM235 LM335
-15V 100pF 50k
8/11
{
LM308
Output 10mV/C
LM135-LM235-LM335,A
THERMOCOUPLE COLD JUNCTION COMPENSATION (compensation for grounded thermocouple)
Thermocouple +15V 4.7k 200k R2 10 k 1% 1M
1%
R3 377 308 293 45.8
Seebeck Coefficient 52.3V/oC 42.8V/oC o 40.8V/ C o 6.4V/ C
J T K S
R3*
1N4568
LM135 LM235 LM335 12k
R1 10k Thermocouple
Adjustments : compensates for both sensor and resistor tolerances. 1. Short 1N4568. 2. Adjust R1 for SEEBECK coefficient times ambient temperature (in degrees K) across R3. 3. Short LM135 and adjust R2 for voltage across R3 corresponding to thermocouple type. J 14.32mV K 11.17mV T 11.79mV S 1.768mV
71.5k 1%
-15V
* Select R3 for proper thermocouple type
SINGLE POWER SUPPLY COLD JUNCTION COMPENSATION
Thermocouple J T K S
Thermocouple LM135 LM235 LM335 R1 10k R3*
+15V
R3 1.05k 856 816 128
R4 365 315 300 46.3
Seebeck Coefficient 52.3V/oC 42.8V/ C o 40.8V/ C o 6.4V/ C
o
10k 200k
+15V
Adjustments : 1. Adjust R1 for the voltage across R3 equal to the SEEBECK coefficient times ambient temperature in degrees Kelvin. 2. Adjust R2 for voltage across R4 corresponding to thermocouple. J 14.32mV K 11.17mV T 11.79mV S 1.768mV
200k 1N4568 R2 10 k 1M
Output
R4*
* Select R3 and R4 for proper thermocouple
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LM135-LM235-LM335,A
PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO)
Dimensions A a1 a2 a3 b b1 C c1 D E e e3 F L M S
Min. 0.1 0.65 0.35 0.19 0.25 4.8 5.8
Millimeters Typ.
Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 5.0 6.2
o
Min. 0.004 0.026 0.014 0.007 0.010 0.189 0.228
Inches Typ.
Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244
1.27 3.81 3.8 0.4 4.0 1.27 0.6 8 (max.)
o
0.050 0.150 0.150 0.016 0.157 0.050 0.024
10/11
SO8.TBL
PM-SO8.EPS
LM135-LM235-LM335,A
PACKAGE MECHANICAL DATA 3 PINS - PLASTIC PACKAGE TO92
Dimensions L B O1 C K O2 a
Min. 3.2 4.45 4.58 12.7 0.407 0.35
Millimeters Typ. 1.27 3.7 5.00 5.03 0.5
Max. 4.2 5.2 5.33 0.508
Min. 0.126 0.1752 0.1803 0.5 0.016 0.0138
Inches Typ. 0.05 0.1457 0.1969 0.198 0.0197
Max. 0.1654 0.2047 0.2098
TO92TBL
0.02
Information furnished is believed to be accurate and reliable. However, SGS-THO MSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not author ized for use as critical componen ts in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
ORDER CODE :
(c) 1997 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdo m - U.S.A.
11/11
PM-TO92.IMG

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