《数字电子技术》课件-显示译码器的原理与应用

数字电子技术显示译码器的原理与应用显示译码器原理集成芯片集成芯片的应用显示译码器数字显示电路显示译码器数码显示器显示译码电路普通译码器输入的是二进制或者十进制代码，输出的是与输入代码一一对应的电平信号。显示译码器输入的是十进制代码，输出的“数码显示器能识别”的信号，使用者读到的是数码显示器上显示的十进制数字的字形。显示译码器芯片原理——数码显示器七段数码显示器PN发光二极管显示译码器芯片原理——数码显示器DP集成芯片74LS4874LS47集成芯片集成芯片—74LS48输出高电平有效，接共阴极数码显示器集成芯片集成芯片—74LS47输出低电平有效，接共阳极数码显示器74LS48abcdefg输出端高平有效8421BCD码辅助控制端限流电阻74LS48限流电阻1、限流电阻的选择发光二极管：工作电压：1.8V—2.2V工作电流：10mA—20mA设电源电压为5V：5V减去发光二级管工作电压（通常为2V即可），再除以10mA~15mA。一般为几百欧姆。74LS482、控制端的处理LT=1RBI=1BT/RBO=1特殊控制端两个功能试灯输入灭零输入74LS48输入数字输入BI/RBO输出字型LTRBIA3A2A1A0YaYbYcYdYeYfYg01100001111111011×00011011000021×00101110110131×00111111100141×01001011001151×01011101101161×01101001111171×01111111000081×10001111111191×100111110011试灯0×111111111111灭零10000000000000消隐××××××00000000074LS48输入数字输入BI/RBO输出字型LTRBIA3A2A1A0YaYbYcYdYeYfYg01100001111111011×00011011000021×00101110110131×00111111100141×01001011001151×01011101101161×01101001111171×01111111000081×10001111111191×100111110011试灯0×111111111111灭零10000000000000消隐××××××000000000174LS48输入数字输入BI/RBO输出字型LTRBIA3A2A1A0YaYbYcYdYeYfYg01100001111111011×000110110000121×00101110110131×00111111100141×01001011001151×01011101101161×01101001111171×01111111000081×10001111111191×100111110011试灯0×111111111111灭零10000000000000消隐××××××000000000274LS48输入数字输入BI/RBO输出字型LTRBIA3A2A1A0YaYbYcYdYeYfYg01100001111111011×000110110000121×001011101101231×00111111100141×01001011001151×01011101101161×01101001111171×01111111000081×10001111111191×100111110011试灯0×111111111111灭零10000000000000消隐××××××000000000345678974LS48输入数字输入BI/RBO输出字型LTRBIA3A2A1A0YaYbYcYdYeYfYg01100001111111011×000110110000121×001011101101231×00111111100141×01001011001151×01011101101161×01101001111171×01111111000081×10001111111191×100111110011试灯0×111111111111灭零10000000000000消隐××××××0000000003456789874LS48输入数字输入BI/RBO输出字型LTRBIA3A2A1A0YaYbYcYdYeYfYg01100001111111011×000110110000121×001011101101231×00111111100141×01001011001151×01011101101161×01101001111171×01111111000081×10001111111191×1001111100119试灯0×1111111111118灭零10000000000000消隐××××××000000000345678005.2005.2全暗74LS48输入数字输入BI/RBO输出字型LTRBIA3A2A1A0YaYbYcYdYeYfYg01100001111111011×000110110000121×001011101101231×00111111100141×01001011001151×01011101101161×01101001111171×01111111000081×10001111111191×1001111100119试灯0×1111111111118灭零10000000000000消隐××××××000000000345678全暗全暗74LS48输入数字输入BI/RBO输出字型LTRBIA3A2A1A0YaYbYcYdYeYfYg01100001111111011×000110110000121×001011101101231×00111111100141×01001011001151×01011101101161×01101001111171×011