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AFE4400通过SPI读取的数据噪声极大,请问是什么问题

Other Parts Discussed in Thread: AFE4400

我用AFE4400,通过MSP430读取的脉搏数据后,在matlab中复现出波形如下图所示。波形的上端总是会出现高峰毛刺噪声,请问是什么问题?在GUI上看到的波形非常平滑,请问TI是在GUI上做的滤波处理吗?我查看了参考源码和硬件电路,源码中无数据处理,硬件电路也滤波电路。请问做过人知道是什么问题?急求!