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ADS8331采样时间问题

Other Parts Discussed in Thread: ADS8331

您好,我用ADS8331采集4路模拟信号,用IO模拟SPI,一路一路的采,四路采完要100多us(每一路采样的时候先后执行:通道选择->预读取当前通道数据->读取当前通道数据,如果不执行预读取当前通道数据,会出现采样的值和通道不对应),时间太长;然而我用自动采样模式,发现采样的结果和通道数不对应(刚开始是对应的,运行一会儿就乱了)。请问能否在20us以内将4个通道的数据准确采集?