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采用三电极，（RL LL和RLD），那么RL LL的共模电压如何提供？我收集到如下2种方法：
1.10M电阻上拉到RLD输出
2.2个10M分压到（AVDD+AVSS）/2
可以先参考一下评估模块 ADS1292 Demonstration Kit http://www.ti.com.cn/tool/cn/ads1292ecg-fe
参考设计:用于个人健康监视的多参数、生物信号监视器参考设计 http://www.ti.com.cn/tool/cn/TIDM-BIOSIGNMONITOR
