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TPA3112、TPA3116增益控制问题

TPA3112\TPA3116两款D类功放芯片通过两个引脚GAIN0\1控制增益。实际使用TPA3112时发现将引脚悬空也能起到给高电平的功能,但是芯片手册没有说明,实际运用的时候将这两个引脚悬空可靠吗?