Atd Accuracy; Table A-10 Atd Conversion Performance; A.2.3 Atd Accuracy - Motorola MC9S12DT256 User Manual

A.2.3 ATD accuracy

Table A-10 specifies the ATD conversion performance excluding any errors due to current injection,
input capacitance and source resistance.
Conditions are shown in Table A-4 unless otherwise noted
V = V - V = 5.12V. Resulting to one 8 bit count = 20mV and one 10 bit count = 5mV
REF RH RL
f = 2.0MHz
ATDCLK
Num C
1 P 10-Bit Resolution
2 P 10-Bit Differential Nonlinearity
3 P 10-Bit Integral Nonlinearity
4 P 10-Bit Absolute Error
5 P 8-Bit Resolution
6 P 8-Bit Differential Nonlinearity
7 P 8-Bit Integral Nonlinearity
8 P 8-Bit Absolute Error
NOTES:
1. These values include the quantization error which is inherently 1/2 count for any A/D converter.
For the following definitions see also Figure A-1.
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

Rating
1
1
DNL i ( )
n
∑
INL n ( )
=
i 1
=
MC9S12DT256 Device User Guide — V03.07
Symbol Min
LSB
DNL –1
INL –2.5
AE -3
LSB
DNL –0.5
INL –1.0
AE -1.5
V V
–
i i 1 –
----------------------- - 1
= –
1LSB
V V
–
n
DNL i ( )
------------------- - n
=
1LSB
Typ Max
5
1
±1.5
2.5
±2.0
3
20
0.5
±0.5
1.0
±1.0
1.5
0
–
Unit
mV
Counts
Counts
Counts
mV
Counts
Counts
Counts
101