A storage device includes a solid-state storage medium having a plurality of cells adapted to store data and an analog-to-digital converter (ADC) coupled to at least one cell of the plurality of cells. The ADC includes a first operating mode having a first number of quantization levels to determine a value stored in the at least one cell based on a number of possible values represented by the at least one cell. The ADC further includes a second operating mode having a second number of quantization levels to determine the value stored in the at least one cell, where the second number of quantization levels is greater than the first number of quantization levels. The ADC selectively enables the first or the second operating mode as a selected operating mode and determines a signal representative of the value stored in the at least one cell using the selected operating mode.