Datasheet

200
ATmega8(L)
2486M–AVR–12/03
Figure 96. ADC Power Connections
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 0.5 LSB). Ideal value: 0 LSB.
Figure 97. Offset Error
GND
VCC
PC5 (ADC5/SCL)
PC4 (ADC4/SDA)
PC3 (ADC3)
PC2 (ADC2)
PC1 (ADC1)
PC0 (ADC0)
ADC7
GND
AREF
AVCC
ADC6
PB5
10µH
100nF
Analog Ground Plane
Output Code
V
REF
Input Voltage
Ideal ADC
Actual ADC
Offset
Error