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ADS1292R共模抑制比

Other Parts Discussed in Thread: ADS1292R

ADS1292R在打开呼吸功能的调制功能后CMRR只有80dB,达不到芯片手册典型值,这个什么办法可以解决?

  • 您看下Figure5的CMRR VS Frequency的曲线,测试信号的共模电压范围为AIN = AVDD − 0.3 V ~ AVSS + 0.3 V。
    另外,CMRR降低的原因还和PCB layout有原因,PCB layout不合理的话,就会导致寄生电容升高,可以参考Page22的介绍。