ADC Code Width

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 of 1 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, zero offset error, zero gain error, and zero DNL, LNL errors). The transfer function of an ideal 3-bit ADC figure below shows the transition points and code width between adjacent points.

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.