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您好！关于ADS1294有几个问题想请教下。
1、RLD相关的外围电路设计和每个引脚代表的意义。
2、EVM板上这部分电路图是什么作用
3、用在脑电信号的采集上，基准点是不是可以接EVM板上ECG_RL这里，也可以接任一通道，通过内部选择输入通道反馈到RLDIN这个引脚作为基准？
RLD 各引脚好几个呢. 查手册
RLDIN Analog input Right leg drive input to mux
RLDOUT Analog output Right leg drive output
RLDINV Analog input/output Right leg drive inverting input
RLDREF Analog input Right leg drive noninverting input
