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Audio DAC PCM1781 输出是否可以对地接1000pF电容

Other Parts Discussed in Thread: PCM1781

在用PCM1781做EMC测试时,发现有较大EMC噪声,在PCM1781输出端串了一个隔直电容,后面接了一个低通滤波器,类似于TI的EVM板设计.

我想在PCM1781输出端(pin14,Pin15)对地接一个1000pF的电容来减小EMC, 我想知道是否能直接加这个电容还是需要串一个电阻然后再接电容? 这样做是否会对输出相位造成影响,并造成输出振荡?--谢谢