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LM135 bảng dữ liệu(PDF) 8 Page - Texas Instruments |
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LM135 bảng dữ liệu(HTML) 8 Page - Texas Instruments |
8 / 28 page LM135, LM135A, LM235, LM235A, LM335, LM335A SNIS160E – MAY 1999 – REVISED FEBRUARY 2015 www.ti.com 7 Detailed Description 7.1 Overview Applications for the LM135 include almost any type of temperature sensing over a −55°C to 150°C temperature range. The low impedance and linear output make interfacing to readout or control circuitry especially easy. The LM135 operates over a −55°C to 150°C temperature range while the LM235 operates over a −40°C to 125°C temperature range. The LM335 operates from −40°C to 100°C. Operating as a 2-terminal zener, the LM135 has a breakdown voltage directly proportional to absolute temperature at 10 mV/°K. With less than 1- Ω dynamic impedance, the device operates over a current range of 400 μA to 5 mA with virtually no change in performance. When calibrated at 25°C, the LM135 has typically less than 1°C error over a 100°C temperature range. Unlike other sensors, the LM135 has a linear output. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Temperature Calibration Using ADJ Pin Included on the LM135 chip is an easy method of calibrating the device for higher accuracies. A pot connected across the LM135 with the arm tied to the adjustment terminal (as shown in Figure 12) allows a 1-point calibration of the sensor that corrects for inaccuracy over the full temperature range. This single point calibration works because the output of the LM135 is proportional to absolute temperature with the extrapolated output of sensor going to 0-V output at 0 K ( −273.15°C). Errors in output voltage versus temperature are only slope (or scale factor) errors so a slope calibration at one temperature corrects at all temperatures. The output of the device (calibrated or uncalibrated) can be expressed as: where 8 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated Product Folder Links: LM135 LM135A LM235 LM235A LM335 LM335A |
Số phần tương tự - LM135_15 |
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Mô tả tương tự - LM135_15 |
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