ATTINY13 datasheet(88/169 Pages) ATMEL

88 / 169 page

ATtiny13

2535B–AVR–01/04

Figure 50. 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 37 on page 89 and Table 38 on page 89). 0x000 represents analog

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

ADC Multiplexer Selection

• Bit 7 – Res: Reserved Bit

This bit is reserved bit in the ATtiny13 and will always read as zero.

• Bit 6 – REFS0: Reference Selection Bit

Output Code

0x3FF

0x000

VREF Input Voltage

DNL

1 LSB

ADC

1024

⋅

RE F

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

Bit

765

–

REFS0

ADLAR

–

MUX1

MUX0

ADMUX

Read/Write

R/W

Initial Value

000

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