●
Integral non-linearity (INL): After adjusting for offset and gain error, the INL is the maximum deviation of an actual
transition compared to an ideal transition for any code. Ideal value: 0 LSB.
Figure 18-11. Integral Non-linearity (INL)
Output Code
Ideal ADC
Actual ADC
V
Input Voltage
REF
●
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 18-12. Differential Non-linearity (DNL)
Output Code
0x3FF
1 LSB
DNL
0x000
0
V
Input Voltage
REF
●
●
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.
206
ATmega16/32/64/M1/C1 [DATASHEET]
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
