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为什们ADS828输入前级要接一个THS4503的驱动电路，而DAC902输出后级要接一个OPA2690的驱动电路，直接输入或直接输出不行吗。这两个驱动电路为什么都是用差分放大器，搞不太懂，
简单说： 这都是信号源的阻抗匹配问题
不好意思，听不太懂，能说详细点吗，
