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z to92 (plastic package . directly calibrated in o k . 1 o c initial accuracy . operates from 450 m a to 5ma . less than 1 w 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- perature at 10mv/ o k. the circuit has a dynamic im- pedance of less than 1 w and operates within a range of current from 450 m a to 5ma without altera- tion of its characteristics. calibrated at +25 o c, the lm135, lm235, lm335 have a typical error of less than 1 o c over a 100 o c 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 v + 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 C55 o c, +150 o c lm235 C40 o c, +125 o c lm335,a C40 o c, +100 o c october 1997
3pf 10k w 50k w 49k w 15.6k w v 600 w 30k w ad j 13 .8k w 1.1k w 2k w v 12pf 49k w 1 2 3 schematic diagram absolute maximum ratings symbol parameter lm135 lm235 lm335,a unit i r i f current reverse forward 15 10 15 10 15 10 ma t oper operating free-air temperature range - (note 1) continuous intermittent C55 to +150 +150 to +200 C40 to +125 +125 to +150 C40 to +100 +100 to +125 o c t stg storage temperature range C65 to +150 C65 to +150 C65 to +150 o c note : 1. t j 150 o c lm135-lm235-lm335,a 2/11
temperature accuracy parameter lm135 - lm235 lm335a lm335 unit min. typ. max. min. typ. max. operating output voltage t case = +25 o c, i r = 1ma 2.95 2.98 3.01 2.92 2.98 3.04 v uncalibrated temperature error (i r = 1ma) t case = +25 o c t min. t case t max. 1 2 3 5 2 4 6 9 o c temperature error with 25 o c calibration t min. t case t max. , i r = 1ma lm135 - lm235 lm335 lm335a 0.5 0.5 1.5 1 12 o c calibrated error at extended temperature t case = t max. (intermittent) 2 2 o c non-linearity (i r = 1ma) lm135 - lm235 lm335 lm335a 0.3 0.3 1 1.5 0.3 1.5 o c electrical characteristics - (note 1) parameter lm135 - lm235 lm335,a unit min. typ. max. min. typ. max. operating output voltage change with current 450 m a i r 5ma at constant temperature 2.5 10 3 14 mv dynamic impedance (i r = 1ma) 0.5 0.6 w output voltage temperature drift +10 +10 mv/ o c time constant still air air 0.5m/s stirred oil 80 10 1 80 10 1 s time stability (t case = +125 o c) 0.2 0.2 o c/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 3/11
lm135-lm235-lm335,a 4/11
lm135-lm235-lm335,a 5/11
application hints there is an easy method of calibrating the device for higher accuracies (see typical applications). the single point calibration works because the out- put of the lm135, lm235, lm335 is proportional to the absolute temperature with the extrapolated out- put of sensor going to 0v at 0 o k ( C273.15 o c). errors in output voltage 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 given by the equation : v ot = vo to x t t o where t is the unknown temperature and t o is the reference temperature (in o k). nominally the output is calibrated at 10mv/ o k. precautions should be taken to ensure good sens- ing accuracy. as in the case of all temperatures sen- 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 the sensor 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 r1 output 10mv/?k typical applications basic temperature sensor v i +5 to +40v lm134, lm234 lm334 68 w lm135 lm235 lm335 output 10mv/?k wide operating supply lm135 lm235 lm335 v r1 output 10mv/?k 10k w * * calibrate for 2.982v at +25 o c calibrated sensor lm135 lm235 lm335 6k w output 30mv/?k +15v average temperature sensing lm135-lm235-lm335,a 6/11
lm135 lm235 lm335 m = 1 +15v +15v 50k w 3k w lm311 lf398 3 8 5 6 7 1 4 2 01. m f 1k w -15v 10k w 200pf 1n4148 1n4148 27k w 3 510 w 10k w 100k w -15v 1000pf 1 5 6 7 4 8 1n457 0.1 m f 2k w output 10mv/?k isolated temperature sensor lm311 2 3 7 4 8 5 6 1 +10v to +30v 2k w 1n4568 4k w 10k w 10k w 5k w 0.01 m f lm135 lm235 lm335 10k w heater buv26 simple temperature controller lm135-lm235-lm335,a 7/11
lm308 2 3 7 6 8 100pf 4 +15v output 10mv/?c lm135 lm235 lm335 +15v 10k w +15v 1k w 2k w * 6k w 8.5k w lm136 * adjust for 2.7315v at output of lm308 12k w { centigrade thermometer lm308 2 3 200k w 7 6 8 100pf 4 +15v output 100mv/?c -15v 50k w 180k w lm135 lm235 lm335 20k w 20k w 12k w 12k w +15v differential temperature sensor lm135-lm235-lm335,a 8/11
thermocouple cold junction compensation (compensation for grounded thermocouple) lm135 lm235 lm335 r1 10k w 4.7k w +15v 1n4568 r2 10 k w r3* 200k w 1m w 1% thermocouple -15v 12k w 71.5k w 1% 1% * 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 377 w 308 w 293 w 45.8 w 52.3 m v/ o c 42.8 m v/ o c 40.8 m v/ o c 6.4 m v/ o c single power supply cold junction compensation lm135 lm235 lm335 r1 10k w 10k w +15v +15v 1n4568 200k w 1m w r2 10 k w r4* output thermocouple r3* 200k w * 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 1.05k w 856 w 816 w 128 w 365 w 315 w 300 w 46.3 w 52.3 m v/ o c 42.8 m v/ o c 40.8 m v/ o c 6.4 m v/ o c lm135-lm235-lm335,a 9/11
pm-so8.eps package mechanical data 8 pins - plastic micropackage (so) dimensions millimeters inches min. typ. max. min. typ. max. 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 s8 o (max.) so8.tbl lm135-lm235-lm335,a 10/11
pm-to92.img package mechanical data 3 pins - plastic package to92 dimensions millimeters inches min. typ. max. min. typ. max. l 1.27 0.05 b 3.2 3.7 4.2 0.126 0.1457 0.1654 o1 4.45 5.00 5.2 0.1752 0.1969 0.2047 c 4.58 5.03 5.33 0.1803 0.198 0.2098 k 12.7 0.5 o2 0.407 0.5 0.508 0.016 0.0197 0.02 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 whi ch may result from its use. no license is granted by implication or otherwise under any pa tent 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 s upplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support devices or systems wit hout express written approval of sgs-thomson microelectronics. ? 1997 sgs-thomson microelectronics C printed in italy C 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 kingdom - u.s.a. order code : lm135-lm235-lm335,a 11/11

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