S912XEG384J3VA Datasheet, PDF (1221/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

Appendix A Electrical Characteristics
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.
Table A-16. ATD Electrical Characteristics
Conditions are shown in Table A-4 unless otherwise noted
Num C
Rating
Symbol
Min
Typ
Max
Unit
1 C Max input source resistance⁽¹⁾
2 D Total input capacitance Non sampling
Total input capacitance Sampling
3 D Input internal Resistance
R_S
—
—
1
KΩ
C_INN
—
—
10
pF
C_INS
—
—
16
R_INA
—
5
15
kΩ
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
1. Refer to A.2.2.3 for further information concerning source resistance
A.2.3 ATD Accuracy
Table A-17 and Table A-18 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 Figure A-1.
Differential non-linearity (DNL) is defined as the difference between two adjacent switching steps.
DNL(i) = ^{V-----i-1--–}--L--V-S---i--B-^–-----1- – 1
The integral non-linearity (INL) is defined as the sum of all DNLs:
n
∑ ^{INL(n) =}
DNL(i) = ^{V---1--n--L---–}-S---V-B---0-- – n
i=1
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