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ATmega325P Datasheet(PDF) 214 Page - ATMEL Corporation

Part # ATmega325P
Description  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P Datasheet(HTML) 214 Page - ATMEL Corporation

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214
8023F–AVR–07/09
ATmega325P/3250P
Figure 21-9. ADC Power Connections
21.7.3
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 2n-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 21-10. Offset Error
VCC
GND
100nF
Analog Ground Plane
(ADC0) PF0
(ADC7) PF7
(ADC1) PF1
(ADC2) PF2
(ADC3) PF3
(ADC4) PF4
(ADC5) PF5
(ADC6) PF6
AREF
GND
AVCC
52
53
54
55
56
57
58
59
60
61
61
62
62
63
63
64
64
1
51
PA0
10
μΗ
Output Code
VREF Input Voltage
Ideal ADC
Actual ADC
Offset
Error



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