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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 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 1Ω and operates within a range of current from 450µA 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 1 V 50kΩ 49kΩ 49kΩ 15.6k Ω 3 pF 10k Ω 1 2pF 60 0Ω 30kΩ 2 AD J 13.8k Ω 2 kΩ 1.1kΩ 3 V 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 450µA ≤ 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 Ω 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. 3/11 LM135-LM235-LM335,A 4/11 LM135-LM235-LM335,A 5/11 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 ... |
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