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数据搜索系统，热门电子元器件搜索 |
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PC87366 数据表(PDF) 209 Page - National Semiconductor (TI) |
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PC87366 数据表(HTML) 209 Page - National Semiconductor (TI) |
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209 / 240 page  12.0 Temperature Sensor (TMS) (Continued) 209 www.national.com 12.5.4 Twisted Pair and Shielded Cables For remote sensor distances longer than 8 in., or in particularly noisy environments, a twisted pair is recommended. Its prac- tical length is 6 feet to 12 feet (typical) before noise becomes a problem, as tested in a noisy electronics laboratory. For longer distances, the best solution is a shielded twisted pair like that used for audio microphones. Connect the twisted pair to DXP and DXN and the shield to GND, and leave the shield’s remote end unterminated. Excess capacitance at DX_ limits practical remote sensor distances. For very long cable runs, the cable’s parasitic capaci- tance often provides noise filtering, so the 2200 pF capacitor can often be removed or reduced in value. Cable resistance also affects remote sensor accuracy; 1 Ω series resistance introduces about +1/2˚C error. |
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