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PGA309电压输出问题

Other Parts Discussed in Thread: PGA309

配置PGA309寄存器时,Vexc管脚可以按配置正确输出电压值,但是Vout管脚有时候可以输出电压,但是输出电压值不正确,未能按照配置的放大倍数输出,大多情况下无电压输出,一直是0V。采用的是单线模式编程,PRG管脚没有和其它管脚链接在一起。不知道是怎么回事?望各位指点一下,谢谢!