atmega3250v-8auatmega325v-8ai ATMEL Corporation, atmega3250v-8auatmega325v-8ai Datasheet - Page 208

• Manufacturer Part Number: atmega3250v-8auatmega325v-8ai
• Description: Atmega3250 8-bit Microcontroller With In-system Programmable Flash
• Manufacturer: ATMEL Corporation

23.6.3
208
ATmega325/3250/645/6450
ADC Accuracy Definitions
Figure 23-9. ADC Power Connections
An n-bit single-ended ADC converts a voltage linearly between GND and V
(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 23-10. 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
(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
n
Ideal ADC
Actual ADC
-1.
REF
2570L–AVR–08/07
in 2
n
steps