ATMEGA649 datasheet(213/375 Pages) ATMEL

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213

ATmega329/3290/649/6490

2552H–AVR–11/06

•

Differential Non-linearity (DNL): The maximum deviation of the actual code width

(the interval between two adjacent transitions) from the ideal code width (1 LSB).

Ideal value: 0 LSB.

Figure 96. Differential Non-linearity (DNL)

•

Quantization Error: Due to the quantization of the input voltage into a finite number

of codes, a range of input voltages (1 LSB wide) will code to the same value. Always

± 0.5 LSB.

•

Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition

compared to an ideal transition for any code. This is the compound effect of offset,

gain error, differential error, non-linearity, and quantization error. Ideal value: ± 0.5

LSB.

ADC Conversion Result

After the conversion is complete (ADIF is high), the conversion result can be found in

the ADC Result Registers (ADCL, ADCH).

For single ended conversion, the result is

where V

IN is the voltage on the selected input pin and VREF the selected voltage refer-

ence (see Table 95 on page 215 and Table 96 on page 216). 0x000 represents analog

ground, and 0x3FF represents the selected reference voltage minus one LSB.

Output Code

0x3FF

0x000

VREF Input Voltage

DNL

1 LSB

ADC

1024

⋅

REF

--------------------------

ADC

POS

NEG

–

() 512

⋅

REF

-----------------------------------------------------

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