公开(公告)号：KR1020020029460A

公开(公告)日：2002-04-19

申请号：KR1020000060194

申请日：2000-10-13

Applicant: 현대중공업 주식회사

Inventor： 김효경 ,  이병의 ,  이태호 ,  김용겸 ,  신승욱

IPC: H03M1/18

CPC classification number: H03M1/18 ,  H03M1/129 ,  H03M2201/196 ,  H03M2201/419

Abstract: PURPOSE: An output level conversion apparatus of an analog/digital conversion circuit is provided, which selects an input analog signal of an A/D conversion unit using a switching device. CONSTITUTION: A decoder(20) decodes a control signal transmitted from a central processing unit(10), and an inverter(30) inverts a signal decoded in the decoder and outputs it. A light emitting diode(LED)(41) is turned on with a signal being output from the inverter. A switching device(40) is combined to a light detection transistor(42) detecting a light emitted from the LED. Thus, the DC level conversion circuit converts a level of the control signal from the central processing unit for it to be used as an input analog selection signal of the A/D conversion unit.

Abstract translation: 目的：提供一种模拟/数字转换电路的输出电平转换装置，其使用切换装置选择A / D转换单元的输入模拟信号。 构成：解码器（20）对从中央处理单元（10）发送的控制信号进行解码，并且逆变器（30）将解码器中解码的信号反相并输出。 发光二极管（LED）（41）由反相器输出的信号导通。 开关装置（40）被组合到检测从LED发射的光的光检测晶体管（42）。 因此，DC电平转换电路将来自中央处理单元的控制信号的电平转换为用作A / D转换单元的输入模拟选择信号。