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请问ads1255如果要单端测量的情况下怎么连接外围电路啊?

大家好,如何为ads1255的ADC采样芯片启用单一转换
我使用的电路设计如下:
pga = 1,
打开缓冲区,
ain0是单端输入,ain1悬空
Aincom连接到2.5v,

差分参考电压= 2.5v(该电压会在芯片内部放大到5v吗?这样,内部参考电压实际上就是5v,软件在计算时应该使用5v作为参考电压,对吧?)
SYNC / PDWN和重置已连接到MCU,