Rainbow-electronics ATmega3290P_V Manuale Utente Scaricare il pdf (Pagina 211)

100

101

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

steps (LSBs). The lowest code is read as 0, and the highest code is read as 2

-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

6161

6262

6363

6464

LCDCAP

PA0

10μΗ

Output Code

REF

Input Voltage

Ideal ADC

Actual ADC

Offset

Error

1 2 ... 206 207 208 209 210 211 212 213 214 215 216 ... 374 375

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