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ATMEGA649 Datasheet(PDF) 211 Page - ATMEL Corporation

Part # ATMEGA649
Description  8-bit Microcontroller with In-System Programmable Flash
PDF  375 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA649 Datasheet(HTML) 211 Page - ATMEL Corporation

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211
ATmega329/3290/649/6490
2552H–AVR–11/06
Figure 92. 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 93. 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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