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PGA2311底躁问题

Other Parts Discussed in Thread: PGA2311

底躁不是十分干净,如果把8脚MUTE拉到地,会安静一些,有优化措施吗?用7805+7905做模拟电源VA+VA-,单独一个7805做数字电源VD,模拟跟数字只有一个接地点,纹波测试过,已经很小了,芯片供电附近也加了104电容,是芯片本身的噪声还是其他什么原因呢。我把输入全部短路了,一样的情况,只有在把mute拉到地,才能达到我满意的状态,