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ADS1298产品输入阻抗不够大

Other Parts Discussed in Thread: ADS1298, ADS1298ECGFE-PDK

  各位技术支持大大,我司用ADS1298做了一款标准12导联产品,在输入阻抗方面实测过小,不合格,改进哪些参数会好些?
  测试电路附件可见。要求10M输入阻抗,串联620k时,标准电压的幅值减小不超过6%,实际上串入电阻后幅值减小超过了20%,阻抗应该远不到10M。 

  

心电图部分.pdf