| 摘要 |
PURPOSE: An analog/digital converter is provided to realize a high power by preventing a delay of a conversion speed owing to a capacitance. CONSTITUTION: In an analog/digital converter, 2¬(n-1) resistors have first ends coupled to a reference voltage terminal, respectively. A first voltage dividing part(21) is composed of switches coupled to second ends of the 2¬(n-1) resistors, respectively. (2¬(n-1)-1) resistors have first ends coupled to a ground voltage terminal, respectively, and a second voltage dividing part(22) is composed of switches coupled to second ends of the (2¬(n-1)-1) resistors, respectively. An OP-AMP(23) has an inverse terminal coupled to a common node, to which an output of the first voltage dividing part and an output of the second voltage dividing part are coupled, and a non-inverse terminal coupled to receive an intermediate voltage of a reference voltage. A switching part(24) is composed of 2¬(n-1) switches configured in parallel between the common node and the inverse terminal. A resistor(R') is coupled between the switching part and an output terminal of the OP-AMP, and adjusts a dynamic range.
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