Appendix A Electrical Characteristics
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
1221
The additional input voltage error on the converted channel can be calculated as:
V
ERR
= K * R
S
* I
INJ
with I
INJ
being the sum of the currents injected into the two pins adjacent to the converted channel.
A.2.3
ATD Accuracy
and
specify the ATD conversion performance excluding any errors due to current
injection, input capacitance and source resistance.
A.2.3.1
ATD Accuracy Definitions
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-16. ATD Electrical Characteristics
Conditions are shown in
Num
C
Rating
Symbol
Min
Typ
Max
Unit
1
C Max input source resistance
1
1
Refer to A.2.2.2 for further information concerning source resistance
R
S
—
—
1
K
Ω
2
D Total input capacitance Non sampling
Total input capacitance Sampling
C
INN
C
INS
—
—
—
—
10
16
pF
3
D Input internal Resistance
R
INA
—
5
15
k
Ω
4
C Disruptive analog input current
I
NA
–2.5
—
2.5
mA
5
C Coupling ratio positive current injection
K
p
—
—
1E-4
A/A
6
C Coupling ratio negative current injection
K
n
—
—
2E-3
A/A
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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