Rainbow Electronics ATmega128L - Manual (Page 231)

231
ATmega128(L)
2467B–09/01
Figure 116. 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 117. 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) 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.
ADC Conversion Result After the conversion is complete (ADIF is high), the conversion result can be found in
the ADC Result registers (ADCL, ADCH).
For single ended conversion, the result is
Output code
V
REF
Input voltage
Ideal ADC
Actual ADC
INL
Output code
0x3FF
0x000
0 V
REF
Input voltage
DNL
1 LSB