车载音响四通道功放IC（TDA7850,TDA7560,TDA7385……)PCB设计小贴士

About the layout grounding, it is particularly important to connect the AC-GND capacitor (16P) to the signal GND, as close as possibleto the audio inputs ground: this will guaranteehigh rejection of any commonmode spurioussignals. The SVR capacitor(10P) hasalso to be connected to the signal GND. Supply filtering elements (6P,20P) have naturally to be connected to the power-ground and located as close as possible to the Vs pins. Pin 1, which is mechanically attached to the de vice’s tab, needs to be tied to the cleanest power ground point in the pc-board, which is generally near the supply filtering capacitors.

关于布局接地，特别重要的是将交流接地电容（16脚）连接到信号地，尽量靠近音频输入的地：这样可以保证高效抑制任何共模干扰信号。SVR 电容（10脚）也必须连接到信号地。供电滤波元件（6脚，20脚）自然需要连接到电源地，并尽可能靠近 Vs 引脚。第 1 引脚机械上与器件的金属片相连，需要接到电路板上最干净的电源地，一般位于供电滤波电容附近。

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