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ADS1298的AVSS管脚

Other Parts Discussed in Thread: ADS1298

我参照了TI设计文档的电路进行设计,采用-2.5V和GND的可选设计,但是一上电后AVSS管脚就自动被拉到了-4V左右,进行信号采集时时序正常,但是1mV的方波信号完全串了通道而且数据和正常有很大差别,请问这是怎么回事,求助专家