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专利名称：Analog-to-digital converting device for
increasing the number of analog inputchannels
发明人：Hideo Inoue申请号：US08/915587申请日：19970821公开号：US05784020A公开日：19980721
摘要：An analog-to-digital (A/D) converting device which substantially increases thenumber of input channels without increasing the number of input terminals. When anexternal channel selecting circuit is asserted \"low\control word to a decode circuit. The decode circuit delivers a corresponding analogsignal to a multiplexer in accordance with the control word. An A/D converter convertsthe analog signal to a digital signal. When the external channel selecting circuit isasserted \"high\Simultaneously, the \"high\" signal from the external channel selecting circuit is applied toan OR gate, which in turn is applied to a multiplexer. An externally inputted analog signalis also applied to the multiplexer. The inputted analog signal is applied to an A/Dconverter, via the multiplexer, and the analog signal is converted to a digital signal.Therefore, since the device can process an analog signal input through an externalchannel input terminal selected by the channel control word and then the predeterminedanalog input terminal, it makes it possible to substantially increase the number of analoginput channels without increasing the number of the built-in analog input terminals.
申请人：MITSUBISHI DENKI KABUSHIKI KAISHA,MITSUBISHI ELECTRICSEMICONDUCTOR SOFWARE CO., LTD.
代理机构：McDermott, Will & Emery
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