<p>➀ Briefly introduces ADC (Analog to Digital Converter) and its basic functions;</p><p>➁ Discusses the author's personal experience with SAR ADC and the importance of engineering experience over theory;</p><p>➂ Explains the three main steps of ADC: sampling, quantization, and coding;</p><p>➃ Describes various ADC specifications and classifications, including static and dynamic parameters, and different types of ADC structures such as full-flash, two-step, pipeline, integrating, successive approximation, and sigma-delta ADCs.</p>