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在较大型的计算机控制系统中,需要测量的点数通常有几十、几百个以上;对每个点都采用一个A/D电路是不可能的,若采用高速大规模的电子模拟开关集成块AD7506,只用一块就能解决这个问题。它是利用多路信号通过选择不同的开关而分时共享一个A/D转换器。此技术早已普遍应用,不过国内市场上,模拟开关都附于A/D转换板上,每块板的数量一般只有8路或16路;对于稍大一点的测量系统,显然就不能满足了。下面介绍一种用6片AD7506构成专门的模拟开关板,其通道量达96路,且结构简单,易于移植,很有实用价值。一、CMOS 16通道模拟多路器AD7506
In a larger computer control system, the need to measure the number of points are usually dozens, hundreds or more; for each point using an A / D circuit is impossible, if the use of high-speed large-scale electronic analog switch integrated block AD7506, only one can solve this problem. It is the use of multi-channel signal through the choice of different switches and share a time-sharing A / D converter. This technology has been widely used, but the domestic market, analog switches are attached to the A / D converter board, the number of each board generally only 8 or 16; for slightly larger measuring system, obviously can not meet. Described below with a 6-piece AD7506 constitute a special analog switch board, the channel volume of 96, and the simple structure, easy to transplant, very practical value. First, CMOS 16-channel analog multiplexer AD7506