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求教ADS1258 热焊盘连接问题

Other Parts Discussed in Thread: ADS1258

请问 在正负电源的系统中, ADS1258 的底部热焊盘到底该连接到那个脚? 29脚数字地?32脚模拟地?  还是5脚 参考地??接错了,或者没有接悬空有什么影响呢?