Image reading apparatus

An image reading apparatus comprising:

• a first reading unit configured to output an analog signal by reading an original;
• a second reading unit different from the first reading unit;
• a conversion unit configured to convert analog signals outputted from the first reading unit and the second reading unit to digital signals;
• a wire connection control unit configured to control a wire connection between the first reading unit and the second reading unit and the conversion unit;
• an output control unit configured to control an output of an analog signal from the first reading unit,
• wherein, in a first reading mode, the wire connection control unit is configured to control the wire connection such that analog signals outputted from a plurality of output channels of the first reading unit are respectively inputted to a plurality of input channels of the conversion unit,
• in a second reading mode different from the first reading mode, the wire connection control unit is configured to control the wire connection such that the analog signals outputted from the plurality of output channels of the first reading unit and analog signals outputted from a plurality of output channels of the second reading unit are inputted to the plurality of input channels of the conversion unit, and
• in the second reading mode, the output control unit is configured to control an output of analog signals such that a timing of an output of an analog signal from each of the plurality of output channels of the first reading unit to be inputted to one input channel of the conversion unit is shifted.