AD converter and AD conversion method

摘要

An A/D converter includes a plurality of AD converting sections that sequentially operate at predetermined intervals. The AD converting section has an ADC that converts an analog signal into a digital signal and outputs the digital signal, a memory that stores, as a specific polarity value, the polarity of a signal obtained by the ADC digitizing an analog signal at a reference voltage, an analog polarity converting circuit that inverts the polarity of the analog signal based on the specific polarity value and a set polarity value, which is previously set, and a digital polarity converting circuit that inverts the polarity of the digital signal based on the specific polarity value and the set polarity value.

主权项

1. An AD converter comprising a plurality of channels of AD converting sections that sequentially operate at predetermined time intervals, wherein each of the AD converting sections comprises:
a data converting section that converts an analog signal into a digital signal and outputs the digital signal; an analog polarity converting circuit that inverts or does not invert a polarity of an analog input signal before supplying the analog input signal to the data converting section as the analog signal; a digital polarity converting circuit that inverts or does not invert a polarity of the digital signal from the data converting section before outputting the digital signal; and a controlling section that controls inversion processing by the analog polarity converting circuit and the digital polarity converting circuit based on a specific polarity value that indicates the polarity of the digital signal obtained from the data converting section in a case where an analog signal at a reference voltage is supplied to the data converting section.