MC9S12DT256 Device User Guide — V03.07
101
A.2.3 ATD accuracy
specifies the ATD conversion performance excluding any errors due to current injection,
input capacitance and source resistance.
For the following definitions see also
Differential Non-Linearity (DNL) is defined as the difference between two adjacent switching steps.
The Integral Non-Linearity (INL) is defined as the sum of all DNLs:
Table A-10 ATD Conversion Performance
Conditions are shown in Table A-4 unless otherwise noted
V
REF
= V
RH
- V
RL
= 5.12V. Resulting to one 8 bit count = 20mV and one 10 bit count = 5mV
f
ATDCLK
= 2.0MHz
Num C
Rating
Symbol
Min
Typ
Max
Unit
1
P 10-Bit Resolution
LSB
5
mV
2
P 10-Bit Differential Nonlinearity
DNL
–1
1
Counts
3
P 10-Bit Integral Nonlinearity
INL
–2.5
±
1.5
2.5
Counts
4
P 10-Bit Absolute Error
1
NOTES
:
1. These values include the quantization error which is inherently 1/2 count for any A/D converter.
AE
-3
±
2.0
3
Counts
5
P 8-Bit Resolution
LSB
20
mV
6
P 8-Bit Differential Nonlinearity
DNL
–0.5
0.5
Counts
7
P 8-Bit Integral Nonlinearity
INL
–1.0
±
0.5
1.0
Counts
8
P 8-Bit Absolute Error
AE
-1.5
±
1.0
1.5
Counts
DNL i
( )
V
i
V
i
1
–
–
1LSB
------------------------
1
–
=
INL n
( )
DNL i
( )
i
1
=
n
∑
V
n
V
0
–
1LSB
--------------------
n
–
=
=
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