您好,ADS4249 规格书中模拟输入 最高能到400M(2-VPP),ADC的最大采样率是250MSPS,输入信号的频率比采样率还要大,这样不满足采样定律吧。
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关于你的咨询,ADS4249的datasheet没什么问题,其他ADC芯片也有这样的电气参数,如下。