ATmega32A datasheet(220/352 Pages) ATMEL

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220

8155B–AVR–07/09

ATmega32A

Figure 22-12. Integral Non-linearity (INL)

• 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 22-13. 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.

22.8

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 reference (see

Table 22-3 on page 222 and Table 22-4 on page 223). 0x000 represents analog ground, and

0x3FF represents the selected reference voltage minus one LSB.

Output Code

VREF Input Voltage

Ideal ADC

Actual ADC

Output Code

0x3FF

0x000

VREF Input Voltage

DNL

1 LSB

ATmega32A Datasheet(PDF) 220 Page - ATMEL Corporation