| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipeline type analog/digital (A/D) converter circuit in which a change in the voltage range of an analog input signal or change of an input system between a differential double end input and a single end input can be easily performed without redesigning a circuit configuration. SOLUTION: When the voltage range of the analog input signal is VIN<SB>p-p</SB>, the full scale range of a sub A/D converter 9 is switched to VIN<SB>p-p</SB>, and the gain of an operational amplifier circuit 11a is switched into single. When the voltage range of the analog input signal is VIN<SB>p-p</SB>/2, the full scale range of the sub A/D converter 9 is switched to VIN<SB>p-p</SB>/2 and the gain of the operational amplifier circuit 11a is switched into double. COPYRIGHT: (C)2003,JPO
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