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F28069没有实际的DAC。一般是通过过滤多达四个PWM通道，以产生平滑的“类DAC”输出
对此我们有一个专门的文档的，您可以参考一下
Using PWM Output as a Digital-to-Analog Converter on a TMS320F280x Digital Signal Controller www.ti.com/.../spraa88a.pdf
或者参考
C:\ti\controlSUITE\device_support\f2806x\v\F2806x_examples_ccsv5\epwm_real-time_interrupts
选择 PWM frequency，根据DAC滤波器获得所需的精度。
