Datasheet

Figure 28-12. Integral Non-linearity (INL)
Output Code
V
REF
Input Voltage
Ideal ADC
Actual ADC
INL
• Differential Non-linearity (DNL): The maximum deviation of the actual code width (the interval
between two adjacent transitions) from the ideal code width (1 LSB). Ideal value: 0 LSB.
Figure 28-13. Differential Non-Linearity (DNL)
Output Code
0x3FF
0x000
0
V
REF
Input Voltage
DNL
1 LSB
• Quantization Error: Due to the quantization of the input voltage into a finite number of codes, a
range of input voltages (1 LSB wide) will code to the same value. Always ±0.5 LSB.
• Absolute accuracy: The maximum deviation of an actual (unadjusted) transition compared to an
ideal transition for any code. This is the compound effect of offset, gain error, differential error, non-
linearity, and quantization error. Ideal value: ±0.5 LSB.
28.7 ADC Conversion Result
After the conversion is complete (ADCSRA.ADIF is set), the conversion result can be found in the ADC
Result registers (ADCL, ADCH).
For single-ended conversion, the result is
ADC =

IN
 1024

REF
ATmega48PA/88PA/168PA
Analog-to-Digital Converter (ADC)
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40002011A-page 324