WM8961的整合式电荷泵(charge pump)能在驱动耳机负载时提供一个接地参考(ground referenced)输出，因此可免除采用直流阻隔电容(DC blocking capacitors)，明显的节省电路板空间和音讯子系统的物料清单成本。
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一般来说，这个引脚接地，但它可连接到任何电压参考。
Generally, this pin is grounded, but it can be tied to any voltage reference.
本文详细比较了大型铜材和钢材接地网在工频电流下的接地性能，对工程应用有一定的参考价值。
The paper compares in detail the ground performance of large copper and steel material grounding grids in power current, which has some reference for the practical engineering.
把汽轮机巨大的底座作为现场良好的接地导体，对于与DCS相连的其它的现场设备也有很好的参考价值。
The locale grounding conductor is the huge pedestal of the turbine. This method also has reference value for other locale equipments in DCS.
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