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ADS1256: ADS1256采样率

Part Number: ADS1256

我目前使用ADS1256,硬件SPI,时钟速度10.25MHZ,读取电压都正常,使用的连续转换。目前设置15K采样率,实际的采样率只有7K多,不知道什么原因。我就是在DRDY外部中断里什么都不处理,不进行数据的读取,计数率也只有7K多。请TI的技术支持,帮忙解决一下。