A/D converter

摘要

An A-to-D converter comprising a plurality of successive approximation type A-to-D converters, each of which includes a cyclic D-to-A converter, a comparator for comparing the analog value with an output value of the D-to-A converter and memory means for sequentially storing an output value of the comparator and supplying the stored value to the D-to-A converter in a reverse order; a plurality of sample and hold circuits for supplying an analog value to each of the plurality of successive approximation type A-to-D converters; and a multiplexer for sequentially supplying an input analog signal to the plurality of sample and hold circuits. Flip-flops included in the respective memory means of the plurality of successive approximation type A-to-D converters for storing an output value of the respective comparator are connected together to form a shift register.