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PCM1840差分输入信号幅度达不到2Vrms，只能达到1Vrms

QINGLIN LI
Prodigy 60 points
Other Parts Discussed in Thread: PCM1840

用PCM1840做音频ADC电路，手册上说最大差分输入2Vrms，现在测试最大差分输入只有1Vrms，超过就会出现过采样现象，请问这是哪里有问题？还是手册参数错误，芯片本身达不到2V？？