| 摘要 |
DA conversion is performed while improving resolution and reducing the influence of errors. A predetermined weight is applied to an output of at least one of a plurality of DA converters to each of which calibration data is given; the resultant outputs are added by an adder. An output of the adder is converted to a digital value by an AD converter. If the predetermined weight has an error outside an allowable range on the basis of the obtained digital value, a calibrating process of obtaining a correction factor for correcting the digital signal to be converted so as to reduce influence of the error is controlled. When a digital signal is to be converted to an analog signal with high precision, the digital signal is corrected with the correction factor, the resultant value is supplied to the DA converters, and DA converted outputs are added by the adder.
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