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关于SLAU247文档中ADS5474开发板电路原理图

Other Parts Discussed in Thread: ADS5474

在SLAU247文档中有关于ADS5474的开发板电路,第22页中输入信号经过两个ETC1-1-13变成差分信号输入ADS5474,这里采用了2个39欧电阻,而ADS5474输入阻抗为1000欧,这样相当于1000欧并联78欧得到72欧,与输入阻抗50欧不匹配啊?请问是不是哪里算的不对?