CODE CONVERSION DEVICE, DIGITAL-ANALOG CONVERSION DEVICE, AND DLL CIRCUIT

摘要

PURPOSE: A code conversion device, a digital-analog conversion device, and a DLL circuit are provided to minimize the analog noise due to a change of a binary code by converting the binary code to an escalator code. CONSTITUTION: A code conversion device includes a difference detection block(120) and an escalator code generation block(140). The difference detection block(120) is used for detecting a difference between a previous binary input code and a present binary input code. The escalator code generation block(140) is used for generating an escalator code having a cash code and a coin code in response to the output of the difference detection block(120). A value of the cash code is increased proportionally to a value of the coin code when a value of the binary input code is increased. The value of the cash code is reduced proportionally to the value of the coin code when the value of the binary input code is reduced.