通常，要求的输出信号为另一个模拟输出信号，这就需要数模转换器。
Often, the required output signal is another analog output signal, which requires a digital to analog converter.
另一方面，为了兼容其他那些工作输入信号电压不为0的器件，如模数-数模转换器，信号电平也许要做平移。
On the other hand, the signal may require level shifting in order to be compatible with the input of other devices (such as ADCs) that are not designed to operate at 0v input.
如果你用长电缆，或驱动(例如并行DAC)几个数模转换器，对于缓冲区中的数据信号它是很好的做法。
If you are driving long cables, or are driving several DACs (parallel DAC for example), it is good practice to buffer the data signal.
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