Analog-to-digital converter

The invention discloses an analog-to-digital converter, comprising a digital-to-analog converter used for obtaining input signals and outputting the input signals to a comparator; the comparator used for comparing the voltages of the input signals to produce a comparison result, and outputting the comparison result to a sequential pulse generator and an asynchronous successive approximation register; the sequential pulse generator used for generating a first control signal according to the comparison result, generating a plurality of first output signals, outputting the first output signals to the asynchronous successive approximation register and outputting the first output signal with the lowest bit and the first control signal to a comparison clock generator; the asynchronous successive approximation register used for generating a plurality of second output signals according to the comparison result and the first output signals and outputting and latching the second output signals as last results; and the