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中文字数:2986,中文页数:6 英文字数:2075页数:7
INTRODUCTION
The AD590 is a two-terminal integrated circuit temperature transducer that produces an output proportional to absolute temperature. For supply voltages between +4 V and +30 V the device acts as a high impedance, constant current source supplying 1 A/K. Laser trimming of the chip’s thin-film resistors is used to calibrate the device to an output of 298.2 A at 298.2K (+25℃).
A typical application for the AD590 is a remote temperature-to-current transducer. Figure 1 shows a thermometer circuit that measures temperature from –55℃ to +100℃and whose output voltage is 100 mV/℃. Since the AD590 measures absolute temperature (its nominal output is 1A/K), the output must be offset by 273.2A in order to read out in degrees Celsius. The output current of the AD590 flows through a 1k resistance, developing a voltage of 1 mV/K. The output of the AD580 2.5V reference is divided down by resistors to provide a 273.2 mV offset, Which is subtracted from the voltage across the 1k resistor by an AD524 instrumentation amplifier. The amplifier provides a gain of 100, so that the output range corresponding to –55℃ to +100℃ is –5.5 V to +10 V (100 mV/℃). An operational amplifier can substitute for the instrumentation amplifier, although care must be taken when designing with the op amp since the gain at the two input terminals will be different.
介 绍
AD590是一种双端集成电路的温度传感器，能产生一个比例绝对温度的输出。供电电压为4V到+30V之间，可作为一个高阻抗，电流源不断提供1 A/K.激光微调的芯片的薄薄膜电阻器是用于校准装置，在298.2K的输出为298.2 A（+25°C时）。
AD590的一个典型应用是温度-电流互感器。图1为温度计电路的措施，温度从-55℃至100℃时，其输出电压是100A /°C。当AD590绝对温度（其名义输出是1A/k）输出，必须读出摄氏度予以抵销273.2 A。AD590的输出电流流经1K电阻，产生电压1 mV/K。AD580的2.5V参考电压输出为电阻提供一个273.2 mV抵销，电压减去经过AD524放大器的1 k电阻。放大器增益为100，使输出范围相应的-55℃至100℃的是-5.5 V至10 V（100 mV/℃）。运算放大器可以替代为仪表放大器，必须注意在设计时运算放大器在两个输入端会有不同的增益。 问 题
模拟装置的应用工程师客户使用AD590在一个偏远的温度到目前的应用时经常问的一个问题是：“多久可以使我接上电缆，如何能消除任何噪音有线电视？”为回答这个问题，实验在一定程度上提供一些证明，使用电路的图1与屏蔽，虽然最初是毫无根据，双绞线（在Belden 9461 ，类型2092）。在一个工业环境以重复的实际条件实验证明。
