Precision temperature sensors
Document overview
- Manufacturer or author: STMICROELECTRONICS
- PDF pages: 16
Technical content
Features
■ Directly calibrated in °K ■ 1°C initial accuracy ■ Operates from 450µA to 5mA ■ Less than 1Ω dynamic impedance
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/°K. 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 +25°C, the LM135, LM235, and LM335 have a typical error of less than 1°C over a 100°C temperature range. Unlike other sensors, the LM135, LM235, LM335 have a linear output. TO-92 (Plastic package) SO-8 (Plastic micropackage) TO-92 (Bottom view) SO-8 (Top view) Pin connections ADJ v+ v- 8765 1234 V+ NC ADJ NC NC VNC NC
1 Schematic diagram
Figure 1. Schematic diagram
2 Absolute maximum ratings
Table 1. Absolute maximum ratings (AMR)
3 Temperature accuracy
4 Electrical characteristics
Table 2. Temperature accuracy Table 3. Electrical characteristics
5 Application information
calibration of the slope at one temperature corrects errors at all temperatures. where T is the unknown temperature and To is the reference temperature (in °K). Nominally, the output is calibrated at 10mV/°K. to their maximum operating temperature. temperature as scale factor errors. Figure 13. Basic temperature sensor Figure 14. Wide operating supply
Figure 22. Single power supply cold junction compensation
6 Package information
6.1 TO-92 tape & reel package information
Figure 23. TO-92 tape & reel package mechanical drawing
Table 4. TO-92 tape & reel package mechanical data
6.2 TO-92 bulk package information
Figure 24. TO-92 bulk package mechanical drawing Table 5. TO-92 bulk package mechanical data
6.3 SO-8 package information
Figure 25. SO-8 package mechanical drawing Table 6. SO-8 package mechanical data
7 Ordering information
8 Revision history
Table 7. Order codes Table 8. Document revision history 6-May-2003 1 Initial release. (it is a bottom view, not a top view). Updated Section 6: Package information and Table 7: Order codes. Improved quality of electrical characteristics curves.