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因为客户不用开发radar subsystem代码，所以具体的说明手册没有公布。digital front-end的作用在TRM文档里有说明。 The digital front-end filters and decimates the raw sigma-delta ADC output, and provides the final ADC data samples at a programmable sampling rate. https://www.ti.com/lit/ug/swru520e/swru520e.pdf
