AD CONVERTER

摘要

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.

主权项

1. A successive approximation type AD (Analog-to-Digital) converter comprising:
a DA (Digital-to-Analog) converter that convert a comparison code; a comparator that compares an analog input signal and an output signal of said DA converter responding to a clock signal; and a control circuit, wherein said control circuit includes:
a first determination unit for outputting a first determination signal corresponding to an output of the comparator;a second determination unit for outputting a second determination signal responding the clock signal; anda first control unit for updating said comparison code responding to said first and second determination signals.