Datasheet

318
7593L–AVR–09/12
AT90USB64/128
Figure 26-12. Integral non-linearity (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 26-13. Differential non-linearity (DNL).
• Quantization Error: Due to the quantization of the input voltage into a finite number of codes,
a range of input voltages (1 LSB wide) w ill 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.
26.8 ADC conversion result
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH).
Output code
V
REF
Input voltage
Ideal ADC
Actual ADC
INL
Output code
0x3FF
0x000
0
V
REF
Input voltage
DNL
1 LSB