Question

An ADC expresses the digital result in 5 bits. Vref+ = 5V and Vref- = 2V. The input analog voltage to be converted is 3.3V. ADC is performed by the successive approximation algorithm. Determine (a) the voltage that was compared with the input voltage (i.e., 3.3V) at each of the five iterations and (b) the successive approximation result (SAR) after each of the five iterations. Express the SAR in a bit-by-bit basis in the following table (i.e., OxBBBBB where B represents a bit), and express the voltage in the two-decimal point precision in the following five questions requiring numerical answers. Iteration SAR

Fill in the voltage compared with the input voltage (i.e., 3.3V) at the 1,2,3,4,5 iterations of the successive approximation algorithm.

Answer 1

Answer in 23.31 Tref = 51. a) Iteration voltage 0 4.5+ Vret 3.45 8.ts -vret = 3.195 3.125 Vreb -3.4375 16 3.4375 - Vreb -3-98185 32 6) Iteration SAR By B₂ B2 B. Bo 10000 T1000 10100 TOITO 10101