A five-level feed-back digital-to-analog converter (DAC) in a switched capacitor sigma-delta analog-to-digital converter has an improved switching sequence that boosts from two to five the number of quantization levels of the feed-back DAC. Switching sequences are used to obtain five equally distributed charge levels C*VREF, C*VREF / 2, 0, −C*VREF / 2 and −C*VREF. When summed with an input voltage, VIN, the five-level feed-back DAC produces five equally distributed output voltages of A*VIN+VREF, A*VIN+VREF / 2, A*VIN+0, A*VIN−VREF / 2 and A*VIN−VREF, where A is gain, VIN is the input voltage, and VREF is the reference voltage.