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TMS320F28335: ADC采样出现毛刺

Part Number: TMS320F28335

我使用28335开发板采集0-2V,50Hz正弦波电压。使用Ti例程Example_2833xAdcSoc,将PWM频率即采样频率提升到20kHz,采样值保存在数组中再暂停用CCS中Graph观察,出现很大毛刺。而使用AD7606采样时Graph非常光滑。请问这是28335程序设置不对还是本身片内ADC精度不足造成。

例程的代码