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关于使用TMS320F28034的输入阻抗问题

Other Parts Discussed in Thread: OP07, TMS320F28034

TI工程师你好!

如上图所示,输入侧为电池电压,经过OP07差分后经过二级RC滤波然后输入到DSP(TMS320F28034)的ADC引脚。请问图中红色标记处的ADC的输入阻抗应该如何计算?十分感谢!