Dear TI:
我们在调试四线制通讯PGA308时发现VS=3.34V,VREF=3.25V，用1W（1W电平=VS）通信下图中第一行ZDAC读写不出数据，有0.09V误差1W第一行读写不出数据，当把VS电压调到3.27V电压后，第一行ZDAC就可以读出数据了,VS与VREF电压是什么对应关系,这个怎么会影响1W通信的读写，是否1W时序上有问题？
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