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ADS5500前端模拟信号输入问题

Other Parts Discussed in Thread: OPA695

在附件中的两张图片,一张是用变压器输入将单端信号转为双端信号,另外一张是通过OPA695将单端信号转为双端信号。我想问的是第一张图片中的Z0怎么处理,R0=50R,代表信号源阻抗吗?第二张图中的Rin和Cin取多大的值呀?