Analog-digital converter |
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| 申请号 | JP3590784 | 申请日 | 1984-02-29 | 公开(公告)号 | JPS60182220A | 公开(公告)日 | 1985-09-17 |
| 申请人 | Fujitsu Ltd; | 发明人 | NUNOKAWA HIDEO; YAMAGUCHI SATORU; TAKAHASHI HITOSHI; | ||||
| 摘要 | PURPOSE:To attain A/D conversion for an analog signal and also A/D conversion for a digital signal by providing a setting device setting a prescribed value to a D/A converter of a sequential conversion form A/D converter. CONSTITUTION:In using the titled converter as an A/D converter, a switch 11 is set to the position shown in solid lines. Since a timing signal phiA is applied to a gate of a transistor (TR)3 of a comparator 5' and a timing signal phiB is applied to a gate of a TR4, an input signal is subjected to A/D conversion. In using the converter as a D/A converter next, a digital value corresponding to an analog output outputted is set to a setting device 12. The set value is fed to the A/D converter 7 via a resistor 6, and the corresponding analog output is outputted from the converter 7. On the other hand, a multiplexer 2 selects one of output terminals, e.g., 1'. Then the switch 11 is changed over to the position shown in broken lines. When the signal phiA is fed to the TRs 3, 4 at the same time, the analog output of the converter 7 is outputted to the terminal 1'. | ||||||
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