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LVDS器件应用

Other Parts Discussed in Thread: DS90LV048A

请问:LVDS接收器件DS90LV048A的输入端除了100欧姆匹配端电阻外,还接了上拉电阻和下拉电阻(等效匹配端电阻99.5欧姆),以提供1.2V的偏置电压、更良好的抗共模电压及浪涌的特性,请问接上下拉电阻是否对,是否有必要;有什么优缺点?