LM135 STMICROELECTRONICS | Alldatasheet

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Z TO92 (Plastic Package .DIRECTLY CALIBRATED IN oK .1oC INITIAL ACCURACY .OPERATES FROM 450 µAT O5 m A .LESS THAN 1Ω DYNAMIC IMPEDANCE

DESCRIPTION

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 proportional to 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 typical error of less than 1oC over a 100oC temperature range. Unlike other sensors, the LM135, LM235, LM335 have a linear output. PIN CONNECTIONS 87 6 5 12 3 4 V NC ADJ NC NC NC NC 135-02.EPS SO8 (Top view) V+ADJ V- 135-01.EPS TO92 (Bottom view) D SO8 (Plastic Micropackage) PRECISION TEMPERATURE SENSORS LM135 LM235-LM335,A ORDER CODES Part num- ber Temperature Range Package ZD LM135 –55 oC, +150oC •• LM235 –40 oC, +125oC •• LM335,A –40 oC, +100oC •• October 1997

3pF 10kΩ 50kΩ 49kΩ 15.6kΩ V 600Ω 30kΩ ADJ 13.8kΩ 1.1kΩ2kΩ V 12pF 49kΩ SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter LM135 LM235 LM335,A Unit IR IF Current Reverse Forward mA T oper Operating Free-air Temperature Range - (note 1) Continuous Intermittent –55 to +150 +150 to +200 –40 to +125 +125 to +150 –40 to +100 +100 to +125 oC Tstg Storage Temperature Range –65 to +150 –65 to +150 –65 to +150 oC Note : 1. Tj ≤ 150oC LM135-LM235-LM335,A

V Uncalibrated Temperature Error (IR = 1mA) Tcase = +25oC Tmin.≤ Tcase ≤ Tmax. oC Temperature Error with 25oC Calibration Tmin.≤ Tcase ≤ Tmax.,IR = 1mA LM135 - LM235 LM335 LM335A 0.5 0.5 1.5 oC Calibrated Error at Extended Temperature Tcase =T max. (intermittent) 2 2 oC Non-linearity (IR = 1mA) LM135 - LM235 LM335 LM335A 0.3 0.3 1.5 0.3 1.5 oC ELECTRICAL CHARACTERISTICS - (note 1) Parameter LM135 - LM235 LM335,A Unit Operating output voltage change with current 450µA ≤ IR ≤ 5mA at constant temperature 2.5 10 3 14 mV Dynamic Impedance (IR = 1mA) 0.5 0.6 Ω Output Voltage Temperature Drift +10 +10 mV/ oC Time Constant Still Air Air 0.5m/s Stirred Oil s 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. LM135-LM235-LM335,A

LM135-LM235-LM335,A

LM135-LM235-LM335,A

There is an easy method ofcalibrating the device 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- put ofsensorgoing to 0V at 0 oK ( –273.15oC). Errors in outputvoltage versus temperature areonly 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 given by the equation : V OT = VO TO x T To where T is the unknown temperature and TO is the reference temperature (inoK). Nominally the output is calibrated at 10mV/oK. Precautions should be taken to ensure good sens- ing accuracy.As in the case ofall temperaturessen- sors, self heating can decrease accuracy. The LM135, LM235, LM335 should operate with a low current, but sufficient to drive the sensor and its cali- bration circuit to their maximum operating tempera- ture. If thesensor is used in surroundings where the ther- mal resistane is constant,the errors due to 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 therefore temperature.In this way the error due to self heating is proportional to the absolute temperature as scale factor errors. LM135 LM235 LM335 V Output 10mV/°K TYPICAL APPLICATIONS BASIC TEMPERATURE SENSOR Vi +5 to +40V LM134, LM234 LM334 68Ω LM135 LM235 LM335 Output 10mV/°K WIDE OPERATING SUPPLY LM135 LM235 LM335 V Output 10mV/°K 10kΩ * * Calibrate for 2.982V at +25oC CALIBRATED SENSOR LM135 LM235 LM335 6kΩ Output 30mV/°K +15V AVERAGE TEMPERATURE SENSING LM135-LM235-LM335,A

m=1 +15V +15V 50kΩ 3kΩ LM311 LF398 5 6 01.µF 1kΩ -15V 10kΩ 200pF 1N4148 1N4148 27kΩ 3510Ω 10kΩ 100kΩ -15V 1000pF 1N457 0.1µF 2kΩ Output 10mV/°K ISOLATED TEMPERATURE SENSOR LM311 +10V to +30V 2kΩ 1N4568 4kΩ 10kΩ 10kΩ 5kΩ 0.01µF LM135 LM235 LM335 10kΩ Heater BUV26 SIMPLE TEMPERATURE CONTROLLER LM135-LM235-LM335,A

+15V Output 10mV/°C LM135 LM235 LM335 +15V 10kΩ +15V 1kΩ 2kΩ * 6kΩ 8.5kΩ LM136 * Adjust for 2.7315V at output of LM308 12kΩ CENTIGRADE THERMOMETER LM308 200kΩ 100pF +15V Output 100mV/°C -15V 50kΩ 180kΩ LM135 LM235 LM335 20kΩ 20kΩ 12kΩ 12kΩ +15V DIFFERENTIAL TEMPERATURE SENSOR LM135-LM235-LM335,A

THERMOCOUPLE COLD JUNCTION COMPENSATION (compensation for grounded thermocouple) LM135 LM235 LM335 10kΩ 4.7kΩ +15V 1N4568 kΩ R3* 200kΩ 1M Ω Thermocouple -15V 12kΩ 71.5kΩ * Select R3 for proper thermocouple type 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 Thermo- couple R3 Seebeck Coefficient J T K S 377Ω 308Ω 293Ω 45.8Ω 52.3µV/oC 42.8µV/oC 40.8µV/oC 6.4µV/oC SINGLE POWER SUPPLY COLD JUNCTION COMPENSATION LM135 LM235 LM335 10kΩ 10kΩ +15V +15V 1N4568 200kΩ 1M ΩR2 kΩ R4* Output Thermocouple R3* 200kΩ * Select R3 and R4 for proper thermocouple 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 correspon- ding to thermocouple. J 14.32mV K 11.17mV T 11.79mV S 1.768mV Thermo- couple R3 R4 Seebeck Coefficient 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 LM135-LM235-LM335,A

PM-SO8.EPS PACKAGE MECHANICAL DATA

8 PINS - PLASTIC MICROPACKAGE (SO)

Dimensions Millimeters Inches A 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 1.65 0.065 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.020 c1 45 o (typ.) D 4.8 5.0 0.189 0.197 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F 3.8 4.0 0.150 0.157 L 0.4 1.27 0.016 0.050 M 0.6 0.024 o (max.) SO8.TBL LM135-LM235-LM335,A

PM-TO92.IMG PACKAGE MECHANICAL DATA

3 PINS - PLASTIC PACKAGE TO92

Dimensions Millimeters Inches L 1.27 0.05 K 12.7 0.5 a 0.35 0.0138 TO92TBL 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. ORDER CODE : LM135-LM235-LM335,A