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请教关于ads1271测量负电压和测量时间的问题

Other Parts Discussed in Thread: ADS1271

1.请问ads1271能不能测量负电压,现在的电路ainn接的是地,ainp接的被测量模拟量,当ainp为正的时候数值正确,当ainp为负值时数值接近于0.

2.手册里的data rate 105496sps是什么概念?我在判断drdy信号前将一个io置高,当drdy信号拉低后,将该io拉低,该io口高电平持续接近3ms,是否意味着一次测量需要接近3ms?

附件是我的原理图和程序,目前测量正的模拟量数值没有问题