| 摘要 |
PROBLEM TO BE SOLVED: To provide a D/A conversion circuit utilizing an R-2R resistance circuit wherein a 2-position switch such as a push button switch can be used, and compaction of a switch and reduction of the incorporation space can be attained. SOLUTION: In the D/A conversion circuit comprising an R-2R resistance circuit having a plurality of operation switches SW1-SW4 connected in parallel and a plurality of voltage divider circuits R1-R8, 2 position switches such as push-button switches each having a free position and an operation position are provided as the operation switches SW1-SW4, grounding resistors R9-R12 are provided in the output line parts of respective operation switches SW1-SW4, and a parallel resistor R13 for detecting abnormalities is provided in the R-2R resistance circuit. COPYRIGHT: (C)2011,JPO&INPIT |
