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ADS5474输入幅度问题。

文档资料上写的是输入2.2Vpp的峰峰值。为什么输入1.1VPP的时候输出就出现削顶的现象了呢(输出OVR管脚显示高电平)?如图所示,前端输入是ADA4960放大器单端转差分,用电容隔了直流。