LM135Z [STMICROELECTRONICS]
PRECISION TEMPERATURE SENSORS; 高精度温度传感器
| 型号： | LM135Z |
| 厂家： | 
ST |
| 描述： | PRECISION TEMPERATURE SENSORS |
| 文件： | 总11页 (文件大小：121K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM135
LM235-LM335,A
PRECISION TEMPERATURE SENSORS
.
.
.
.
DIRECTLY CALIBRATED IN oK
1oC INITIAL ACCURACY
OPERATES FROM 450µA TO 5mA
LESS THAN 1Ω DYNAMIC IMPEDANCE
Z
TO92
(Plastic Package
D
SO8
DESCRIPTION
(Plastic Micropackage)
The LM135, LM235, LM335 are precision tempera-
ture sensors which can be easily calibrated. They
operate as a 2-terminal Zener and the breakdown
voltage is directly proportionalto the absolute tem-
peratureat 10mV/oK. The circuit has a dynamic im-
pedance of less than 1Ω and operates within a
range of current from 450µA to 5mA without altera-
tion of its characteristics. Calibrated at +25oC, the
LM135, LM235, LM335 have a typicalerror of less
than 1oC over a 100oC temperature range. Unlike
other sensors, the LM135, LM235, LM335 have a
linear output.
ORDER CODES
Package
Part num-
ber
Temperature
Range
Z
•
D
•
LM135
–55oC, +150oC
–40oC, +125oC
–40oC, +100oC
LM235
•
•
LM335,A
•
•
PIN CONNECTIONS
TO92
(Bottom view)
SO8
(Top view)
+
NC
7
NC
6
ADJ
5
V
8
-
+
V
V
ADJ
1
NC
2
NC
3
NC
4
-
V
October 1997
LM135-LM235-LM335,A
SCHEMATIC DIAGRAM
V
1
50kΩ
49kΩ
49kΩ
15.6kΩ
12pF
10kΩ
3pF
600Ω
30kΩ
ADJ
2
13.8kΩ
2kΩ
1.1kΩ
3
V
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
LM135
LM235
LM335,A
Unit
Current
Reverse
Forward
mA
IR
IF
15
10
15
10
15
10
Toper
Operating Free-air Temperature Range - (note 1)
oC
oC
Continuous
Intermittent
–55 to +150
+150 to +200 +125 to +150 +100 to +125
–40 to +125
–40 to +100
Tstg
Storage Temperature Range
Note : 1. Tj ≤ 150oC
–65 to +150
–65 to +150
–65 to +150
2/11
LM135-LM235-LM335,A
TEMPERATURE ACCURACY
LM135 - LM235
LM335A
LM335
Unit
Parameter
Min.
Typ.
Max.
Min.
Typ.
Max.
Operating Output Voltage
Tcase = +25oC, IR = 1mA
V
2.95
2.98
3.01
2.92
2.98
3.04
Uncalibrated Temperature Error (IR = 1mA)
oC
Tcase = +25oC
1
2
3
5
2
4
6
9
Tmin. ≤ Tcase ≤ Tmax.
Temperature Error with 25oC Calibration
oC
Tmin. ≤ Tcase ≤ Tmax., IR = 1mA LM135 - LM235
0.5
0.5
1.5
1
LM335
LM335A
1
2
Calibrated Error at Extended Temperature
Tcase = Tmax. (intermittent)
oC
oC
2
2
Non-linearity (IR = 1mA)
LM135 - LM235
LM335
0.3
1
0.3
1.5
LM335A
0.3
1.5
ELECTRICAL CHARACTERISTICS - (note 1)
LM135 - LM235
LM335,A
Typ.
Parameter
Unit
Min.
Typ.
Max.
Min.
Max.
Operating output voltage change with current
mV
450µA ≤ IR ≤ 5mA at constant temperature
2.5
0.5
10
3
14
Dynamic Impedance (IR = 1mA)
Output Voltage Temperature Drift
0.6
+10
Ω
mV/oC
s
+10
Time Constant
Still Air
Air 0.5m/s
Stirred Oil
80
10
1
80
10
1
Time Stability (Tcase = +125oC)
0.2
0.2
oC/kh
Note : 1. Accuracy measurements are made in a well-stirred oil bath. For other conditions, self heating must be considered.
3/11
LM135-LM235-LM335,A
4/11
LM135-LM235-LM335,A
5/11
LM135-LM235-LM335,A
APPLICATION HINTS
Nominally the output is calibrated at 10mV/oK.
Precautions shouldbe takento ensure good sens-
ing accuracy.As in thecase ofall temperaturessen-
sors, self heating can decrease accuracy. The
LM135, LM235, LM335 should operate with a low
current, butsufficientto drive thesensorand its cali-
bration circuit to their maximum operating tempera-
ture.
Thereis aneasy methodofcalibrating thedevice for
higher accuracies (see typical applications).
The single point calibration works because the out-
put of the LM135, LM235, LM335 is proportionalto
the absolutetemperature with the extrapolatedout-
o
put ofsensorgoing to 0V at 0oK ( –273.15 C). Errors
in outputvoltage versustemperature areonly slope.
Thus a calibration of the slope at one temperature
corrects errors at all temperatures.
If thesensor is used in surroundingswhere the ther-
malresistaneis constant,theerrors dueto self heat-
ing can be externally calibrated. This is possible if
the circuit is biased with a temperature stable cur-
rent. Heating will then be proportional to zener volt-
age and thereforetemperature.In this way the error
due to self heating is proportional to the absolute
temperature as scale factor errors.
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
WIDE OPERATING SUPPLY
V
i
V
+5 to +40V
LM134, LM234
LM334
R1
68Ω
Output
LM135
LM235
LM335
10mV/°K
Output
10mV/°K
LM135
LM235
LM335
CALIBRATED SENSOR
V
AVERAGE TEMPERATURE SENSING
+15V
6kΩ
R1
Output
30mV/°K
Output
10mV/°K
LM135
LM235
LM335
LM135
LM235
LM335
Ω
10k *
* Calibrate for 2.982V at +25oC
6/11
LM135-LM235-LM335,A
ISOLATED TEMPERATURE SENSOR
LM135
LM235
LM335
+15V
+15V
50kΩ
1N457
µ
0.1 F
m = 1
3kΩ
Ω
2k
01.µF
3
2
8
1
5
Ω
10k
510Ω
6
3
Output
10mV/°K
5
6
LF398
LM311
Ω
7
1k
7
1N4148
200pF
1
4
4
8
Ω
10k
27kΩ
100kΩ
1000pF
-15V
1N4148
-15V
SIMPLE TEMPERATURE CONTROLLER
+10V to +30V
2kΩ
Heater
Ω
10k
Ω
10k
Ω
5k
2
3
5
6
µ
0.01 F
8
7
BUV26
1N4568
LM311
10kΩ
4
1
LM135
4kΩ
LM235
LM335
7/11
LM135-LM235-LM335,A
CENTIGRADE THERMOMETER
1kΩ
+15V
+15V
+15V
7
2
Ω
12k
Ω
6k
6
LM308
{
Output
10mV/°C
3
8
4
LM135
LM235
LM335
10kΩ
8.5kΩ
LM136
100pF
2k
Ω *
* Adjust for 2.7315V at
output of LM308
DIFFERENTIAL TEMPERATURE SENSOR
+15V
200kΩ
12kΩ
Ω
12k
+15V
7
Ω
20k
2
6
Output
100mV/°C
LM308
20kΩ
8
3
4
-15V
Ω
180k
LM135
LM235
LM335
100pF
50kΩ
8/11
LM135-LM235-LM335,A
THERMOCOUPLE COLD JUNCTION COMPENSATION
(compensation for grounded thermocouple)
Thermo-
couple
Seebeck
Coefficient
R3
52.3µV/oC
42.8µV/oC
40.8µV/oC
6.4µV/oC
+15V
J
T
K
S
377Ω
308Ω
293Ω
45.8Ω
4.7kΩ
Ω
200k
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.
1%
R2
10
kΩ
R3*
1N4568
1MΩ
3. Short LM135 and adjust R2 for voltage
across R3 corresponding to thermocouple
type.
1%
R1
10k
LM135
LM235
LM335
J
14.32mV
11.79mV
K
S
11.17mV
1.768mV
Ω
T
Thermocouple
71.5kΩ
1%
12kΩ
-15V
* Select R3 for proper thermocouple type
SINGLE POWER SUPPLY COLD JUNCTION COMPENSATION
Thermo-
couple
Seebeck
Coefficient
R3
R4
+15V
J
T
K
S
1.05kΩ
856Ω
816Ω
128Ω
365Ω
315Ω
300Ω
46.3Ω
52.3µV/oC
42.8µV/oC
40.8µV/oC
6.4µV/oC
10kΩ
Ω
200k
Thermocouple
Adjustments :
LM135
LM235
LM335
R1
10kΩ
R3*
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 correspon-
ding to thermocouple.
J
T
14.32mV
11.79mV
K
S
11.17mV
1.768mV
+15V
200kΩ
1MΩ
Output
1N4568
R2
10
kΩ
R4*
* Select R3 and R4 for proper thermocouple
9/11
LM135-LM235-LM335,A
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Millimeters
Dimensions
Inches
Typ.
Min.
Typ.
Max.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
Min.
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
A
a1
a2
a3
b
0.1
0.004
0.65
0.35
0.19
0.25
0.026
0.014
0.007
0.010
b1
C
c1
D
45o (typ.)
4.8
5.8
5.0
6.2
0.189
0.228
0.197
0.244
E
e
1.27
3.81
0.050
0.150
e3
F
3.8
0.4
4.0
1.27
0.6
0.150
0.016
0.157
0.050
0.024
L
M
S
8o (max.)
10/11
LM135-LM235-LM335,A
PACKAGE MECHANICAL DATA
3 PINS - PLASTIC PACKAGE TO92
Millimeters
Inches
Dimensions
Min.
Typ.
1.27
3.7
Max.
Min.
Typ.
0.05
Max.
L
B
3.2
4.45
4.58
12.7
0.407
0.35
4.2
5.2
0.126
0.1752
0.1803
0.5
0.1457
0.1969
0.198
0.1654
0.2047
0.2098
O1
C
5.00
5.03
5.33
K
O2
a
0.5
0.508
0.016
0.0138
0.0197
0.02
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsi-
bility 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 authorized for use as critical
components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
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
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