某8位D/A变换器的输出最大电压为5V，其分辨率指标是最低有效位输入时输出的变化程度，那么该D/A变换器的分辨率是（）。
- A.10mv
- B.20mv
- C.40mv
- D.50mv
正确答案及解析
正确答案
解析
本题考查嵌入式处理器D/A的基础知识。D/A转换器就是将数字量转换为模拟量的电路。主要用于数据传输系统、自动测试设备、医疗信息处理、电视信号的数字化、图像信号的处理和识别、数字通信和语音信息处理等。D/A转换器输入的数字量是由二进制代码按照数位组合起来表示，在D/A转换中，要将数字量转换为模拟量必须先把每一位按照其权的大小转换为相应的模拟量>然后再将各个分量相加，其总和就是和数字量对应的模拟量。D/A转换器的性能指标包括分辨率、稳定时间（转换时间）、绝对精度、线性误差。分辨率反映了D/A转换器对模拟量的分辨能力，实际就是输入二进制最低有效位LSB相当的输出模拟电压，简称为1LSB。稳定时间是指输入二进制变化量是满量程时，D/A转换器的输出达到离终值正负1/2LSB时所需要的时间。绝对精度是指输入满刻度数字量时，D/A转换器的实际输出值与理论值之间的偏差。若某D/A转换器的位数为8，则刻度值为255，如果输出最大电压是5V，则D/A分辨率为5V/255即为20mv。
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