| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems wherein a successive approximation register A/D converter is influenced by interference from other circuits via a power line, and an approximation action of the successive approximation register AD converter is delayed.SOLUTION: A successive approximation register A/D converter 200 for producing an N-bit output is operationally interrupted at timings of operational influence on the successive approximation register A/D converter 200 on the basis of timings of operation of each circuit of an integrated circuit 1. The successive approximation register A/D converter 200 compares a sampling signal with comparative reference voltages in a sampling period of sampling an analog signal, an N-state approximation period of successively comparing the sampled signal bit by bit with the comparative voltages, and an M-state reserve period following the approximation period. In the event of an operational interruption, the successive approximation register A/D converter 200 executes in the reserve period the comparison action of the bit that has not been compared in the approximation period. |
