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A/D转换器性能的另一个重要参数是转换精度。该精度定义成输入模拟信号的实际电压值与被转换成数字量的理论电压值E之间的差值,称之为器件的绝对误差。标定器件精度还有用相对误差表示的,它是指在去掉偏移误差和增益误差之后,用输入的模拟信号的实际电压值与转换成数字量的理论电压E之间的差值。所谓偏移误差是指器件最低有效位为“1”时实际输入电压值与理论值之差。在特性曲线上它表现为第一个代码点
Another important parameter of A / D converter performance is the conversion accuracy. This precision is defined as the difference between the actual voltage value of the input analog signal and the theoretical voltage value E that is converted into a digital quantity, which is called the absolute error of the device. The accuracy of the calibration device is also expressed in terms of relative error, which is the difference between the actual voltage value of the input analog signal and the theoretical voltage E converted to a digital value, after the offset and gain errors have been removed. The so-called offset error refers to the difference between the actual input voltage and the theoretical value when the least significant bit of the device is “1”. It appears as the first code point on the characteristic curve