| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital/analog conversion circuit that is suitable for a stepping motor drive circuit, can suppress influence by variations in a manufacturing process, and can reduce dead space. SOLUTION: The digital/analog conversion circuit 1 includes a resistor network 7 in which a plurality of resistor sections 11-25, where a resistance value becomes larger from a reference voltage V<SB>REFVDD</SB>at a power supply side to that V<SB>REFGND</SB>at a ground side as required, are connected in series; and a switch network 8 that inputs the voltages of the connection points of the plurality of resistor sections 11-25 each, and changes and selects them for output. In this case, each of the plurality of resistor sections 11-25 comprises one or a plurality of resistive elements in the same shape. COPYRIGHT: (C)2007,JPO&INPIT |
