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PGA281输出端信号始终无变化是什么问题?

Other Parts Discussed in Thread: PGA281

一、目的:实现对电桥信号的1X、2X、4X、8X、16X、32X、64X、128X放大!

二、问题描述,无论电桥信号如何变化,输出端始终只有14.6mv的信号,无任何变化,

G0-G4的配置为:G4 -> GND,G0-G3由STM32引脚控制,测量过控制引脚电平没问题;

请教下这会是什么问题呢?