ATMEGA325-16AJ ATMEL [ATMEL Corporation], ATMEGA325-16AJ Datasheet - Page 201

• Manufacturer Part Number: ATMEGA325-16AJ
• Description: 8-bit Microcontroller with In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

ADC Accuracy Definitions
2570A–AVR–09/04
Figure 91. ADC Power Connections
An n-bit single-ended ADC converts a voltage linearly between GND and V
steps (LSBs). The lowest code is read as 0, and the highest code is read as 2
Several parameters describe the deviation from the ideal behavior:
•
Figure 92. Offset Error
Offset: The deviation of the first transition (0x000 to 0x001) compared to the ideal
transition (at 0.5 LSB). Ideal value: 0 LSB.
Output Code
Offset
Error
Analog Ground Plane
100nF
ATmega325/3250/645/6450
(ADC7) PF7
(ADC6) PF6
(ADC5) PF5
(ADC4) PF4
(ADC3) PF3
(ADC2) PF2
(ADC1) PF1
(ADC0) PF0
AREF
AVCC
GND
GND
VCC
PA0
51
52
53
54
55
56
57
58
59
60
61 61
62 62
63 63
64 64
1
V
REF
Input Voltage
Ideal ADC
Actual ADC
n
-1.
REF
in 2
201
n