公开(公告)号：US20160112058A1

公开(公告)日：2016-04-21

申请号：US14983950

申请日：2015-12-30

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Kazuaki DEGUCHI ,  Masao ITO

IPC: H03M1/00 ,  H03M1/06 ,  H03K5/159 ,  H03M1/46

CPC classification number: H03M1/002 ,  H03K5/159 ,  H03M1/0624 ,  H03M1/125 ,  H03M1/38 ,  H03M1/462

Abstract: A successive approximation type AD converter includes: a comparator comparing an analog input signal and a DA-converted comparison code; and a control circuit. When an output of the comparator settles before a limit time period has passed since the comparator started a comparison operation, the control circuit updates the comparison code on the basis of the settled output of the comparator. When the limit time period has passed before the output of the comparator settles, the control circuit updates the comparison code not on the basis of the present output of the comparator.