The width of a given output code (code width) is the range of analog input voltages between two adjacent transition points of an Analog-to-Digital Converter (ADC) digital output code. The code widths are referenced to the weight of1 Least Significant Bit (LSB), which is defined by the resolution of the converter and the analog reference voltage (VREF). For example,1 LSB = VREF/2n, where n is the number of bits of resolution. For example, if a 4.096 V reference is used with a 12-bit ADC, 1 LSB will have a weight of 4.096 V/212, or 1 mV. All codes will have a width of 1 LSB for an ideal ADC (i.e, zerooffset error, zerogain error, and zeroDNL,LNL errors). The transfer function of an ideal 3-bit ADC figure below shows the transition points and code width between adjacent points.
