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LM134是一种新型的硅集成温度传感器,它不同于一般诸如热敏电阻、温差电偶以及半导体PN结等传统的温度传感器。它是根据下述原理设计而成的,即工作在不同电流密度下的两只相同晶体管,其基、射结的结电压之差△V_(be)与绝对温度T严格成正比。因而该器件的突出优点是在整个工作温区范围内(-55℃～+125℃)输出电流几乎与被测温度成线性关系,这样,就可省去非线性校正网络,使用简便。此外,它还具有下列特点:(1)起始电压低(低于1.5V),而器件耐压较高,因而电源电压适用范围宽(在3～40V之间)。(2)灵敏度高(1μA/K),输出信号幅度大。一般情况下,不必加中间放大就可直接驱动检测系统,例如双积分型A/D转换器5G14433或ICL7106等。从而消除了中间环节所引入的误差,提高测温精度。(3)输出阻抗高,一般大于10MΩ。所以它相当于一个受温度控制的恒流源,有较强的抗干扰能力,特别适用于长距离测温和控温场合。由于它的恒流特性,能消除电源电压波动和交流纹波对器件工乍的影响,从而降低了对电源精度的要求。
The LM134 is a new silicon integrated temperature sensor that differs from conventional temperature sensors such as thermistors, thermocouples, and semiconductor PN junctions. It is designed according to the following principle, that is working in two different current density of the same transistor, the base, the emitter junction voltage difference △ V be strictly proportional to the absolute temperature T. The outstanding advantage of this device is that the output current is almost linear with the measured temperature over the entire operating temperature range (-55 ° C to + 125 ° C). This eliminates the need for a non-linear calibration network and is easy to use. In addition, it has the following features: (1) low starting voltage (less than 1.5V), and higher device withstand voltage, so the power supply voltage range (between 3 ~ 40V). (2) high sensitivity (1μA / K), the output signal amplitude. Under normal circumstances, you can directly drive the detection system without intermediate amplification, such as dual integral A / D converter 5G14433 or ICL7106. Thus eliminating the error introduced by the intermediate links to improve the temperature measurement accuracy. (3) high output impedance, generally greater than 10MΩ. So it is equivalent to a temperature-controlled constant current source, a strong anti-interference ability, especially for long-distance temperature and temperature control applications. Because of its constant current characteristics, it can eliminate the impact of power supply voltage fluctuations and AC ripple on the device first-hand, thus reducing the power supply accuracy requirements.