Successive Approximation ADC Process 1. MSB initialized as 1 2. Convert digital value to analog using DAC 3. Compares guess to analog input 4. Is V in>V DAC â¢ Set bit 1 â¢ If no, bit is 0 and test next bit Closed-Loop SAR DAC Output V IN-+ 1000 0000 Is V in > Â½ ADC range? 0100 0000 If no, then test next bit V ref