MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 612

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Appendix A Electrical Characteristics
A.2.3.3
There are two cases to consider.
A.2.4
Table A-12
capacitance and source resistance
1. These values include quantization error which is inherently 1/2 count for any A/D converter.
612
Conditions are shown in
Conditions are shown in
V
f
ATDCLK
Num
Num
.
REF
1
2
3
4
5
1
2
3
4
5
6
7
8
1. A current is injected into the channel being converted. The channel being stressed has conversion
2. Current is injected into pins in the neighborhood of the channel being converted. A portion of this
= V
values of $3FF ($FF in 8-bit mode) for analog inputs greater than V
than V
current is picked up by the channel (coupling ratio K), This additional current impacts the accuracy
of the conversion depending on the source resistance.
The additional input voltage error on the converted channel can be calculated as V
I
channel.
= 2.0MHz
INJ
RH
C
C
T
C
C
C
C
P
P
P
P
P
P
P
P
– V
, with I
specifies the ATD conversion performance excluding any errors due to current injection, input
ATD Accuracy (5V Range)
Current Injection
RL
RL
Max input Source Resistance
Total Input Capacitance
Disruptive Analog Input Current
Coupling Ratio positive current injection
Coupling Ratio negative current injection
10-Bit Resolution
10-Bit Differential Nonlinearity
10-Bit Integral Nonlinearity
10-Bit Absolute Error
8-Bit Resolution
8-Bit Differential Nonlinearity
8-Bit Integral Nonlinearity
8-Bit Absolute Error
= 5.12V. Resulting to one 8 bit count = 20mV and one 10 bit count = 5mV
unless the current is higher than specified as disruptive conditions.
INJ
Table A-4
Table A-4
being the sum of the currents injected into the two pins adjacent to the converted
unless otherwise noted
unless otherwise noted
Rating
Table 20-18. ATD Electrical Characteristics
Table A-12. ATD Conversion Performance
1
Rating
(1)
Non Sampling
MC9S12Q128
Sampling
Rev 1.09
Symbol
DNL
DNL
LSB
LSB
INL
INL
AE
AE
Symbol
C
C
I
R
K
K
NA
INN
INS
S
p
n
–0.5
–1.0
Min
-2.5
-1.5
–1
–2
—
—
–2.5
Min
—
—
—
—
—
RH
and $000 for values less
Typ
—
—
—
20
—
0.5
5
1
Typ
—
—
—
—
—
—
Freescale Semiconductor
ERR
Max
Max
2.5
0.5
1.0
1.5
10
10
—
—
2.5
10
15
1
2
1
-4
-2
= K * R
Counts
Counts
Counts
Counts
Counts
Counts
Unit
Unit
mV
mV
mA
A/A
A/A
K
pF
S
*