A/D converter and open detection method thereof

摘要

An A/D converter includes a sampling capacitor that accumulates a charge according to an input voltage, a first initialization switch that initializes the sampling capacitor, a sample hold switch that switches a connection state of an external input terminal and the sampling capacitor, and a second initialization switch that initializes a charge accumulated in an input node via a resistor, the input node connecting the external input terminal and the sample hold switch.