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信号最大速率1MHz，由FPGA 3.3V IO输出，需要将其振幅转换成1.1V，输出阻抗为50Ω，支持高阻输出...转出信号眼图如下
亲；1M速率；原则上可以用电阻分压方式衰减匹配。输出串联电阻为150ohm；对地电阻为75ohm。
SN74AVC4T245 可以支持1.2V
