MC9S12E256 Datasheet, PDF (588/602 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Appendix A Electrical Characteristics
A.6.5 ATD Accuracy — 3.3V Range
Table A-23 specifies the ATD conversion performance excluding any errors due to current injection, input
capacitance and source resistance.
Table A-23. 3.3V ATD Conversion Performance
Conditions are shown in Table A-4 unless otherwise noted
V_REF = V_RH - V_RL = 3.328V. Resulting to one 8 bit count = 13mV and one 10 bit count = 3.25mV
f_ATDCLK = 2.0MHz
Num C
Rating
Symbol
Min
Typ
Max
Unit
1 P 10-Bit Resolution
LSB
—
3.25
2 P 10-Bit Differential Nonlinearity
DNL
–1.5
3 P 10-Bit Integral Nonlinearity
4 P 10-Bit Absolute Error¹
INL
–3.5
±1.5
AE
–5
±2.5
5 C 10-Bit Absolute Error at f_ATDCLK= 4MHz
6 P 8-Bit Resolution
AE
—
±7.0
LSB
—
13
7 P 8-Bit Differential Nonlinearity
DNL
–0.5
—
8 P 8-Bit Integral Nonlinearity
INL
–1.5
±1.0
9 P 8-Bit Absolute Error¹
AE
–2.0
±1.5
1 _{These values include the quantization error which is inherently 1/2 count for any A/D converter.}
—
mV
1.5
Counts
3.5
Counts
5
Counts
—
Counts
—
mV
0.5
Counts
1.5
Counts
2.0
Counts
For the following definitions see also Figure A-9.
Differential Non-Linearity (DNL) is defined as the difference between two adjacent switching steps.
DNL(i)
=
V_-----i---–_-----V_{----i---–-----1-}
1LSB
–
1
The Integral Non-Linearity (INL) is defined as the sum of all DNLs:
n
∑ ^{INL(n) =}
DNL(i) = ^V-----ⁿ-----^–----^V-----⁰- – n
1LSB
i=1
MC9S12E256 Data Sheet, Rev. 1.08
588
Freescale Semiconductor