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ATmega128
ADC Accuracy
Definitions
An n-bit single-ended ADC converts a voltage linearly between GND and V REF in 2 n steps
(LSBs). The lowest code is read as 0, and the highest code is read as 2 n -1.
Several parameters describe the deviation from the ideal behavior:
?
Offset: The deviation of the first transition (0x000 to 0x001) compared to the ideal transition
(at 0.5LSB). Ideal value: 0LSB.
Figure 115. Offset Error
Output Code
Ideal ADC
Actual ADC
Offset
Error
V REF Input Voltage
?
Gain Error: After adjusting for offset, the gain error is found as the deviation of the last
transition (0x3FE to 0x3FF) compared to the ideal transition (at 1.5LSB below maximum).
Ideal value: 0LSB
Figure 116. Gain Error
Output Code
Gain
Error
Ideal ADC
Actual ADC
V REF Input Voltage
?
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:
0LSB.
239
2467X–AVR–06/11
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