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PGA281一放大128倍输出电压错误?

Other Parts Discussed in Thread: PGA281, ADS1271

我PGA281放大1倍的情况下短路输入(14、15脚),输出(8、9脚)输出0.002V。在放大128倍时输出1.28V,其中9脚3.177V,8脚1.744.且不稳定。EF始终为低电平。如图已将R5,R17去除。