164
9152BINDCO02/10
ATA8743
Figure 25-12. 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.
25.8 ADC Conversion Result
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH). The form of the conversion result depends on the type of the
conversion as there are three types of conversions: single ended conversion, unipolar differen-
tial conversion and bipolar differential conversion.
25.8.1
Single Ended Conversion
For single ended conversion, the result is
where V
IN
is the voltage on the selected input pin and V
REF
the selected voltage reference (see
Table 25-3 on page 166 and Table 25-4 on page 167). 0x000 represents analog ground, and
0x3FF represents the selected reference voltage minus one LSB. The result is presented in
one-sided form, from 0x3FF to 0x000.
25.8.2
Unipolar Differential Conversion
If differential channels and an unipolar input mode are used, the result is
where VPOS is the voltage on the positive input pin, VNEG the voltage on the negative input pin,
and VREF the selected voltage reference. The voltage of the positive pin must always be larger
utput Code
0x3FF
0x000
0
V
Input Voltage
DNL
1 LSB
ADC
V
IN
1024
?/DIV>
V
REF
---------------------------- -
=
ADC
V
POS
V
NEG
(
) 1024
?/DIV>
V
REF
---------------------------------------------------------- - GAIN
?/DIV>
=
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