參數(shù)資料
型號： MC9S12KC128CPU
廠商： 飛思卡爾半導體(中國)有限公司
英文描述： Microcontrollers
中文描述： 微控制器
文件頁數(shù)： 99/126頁
文件大小： 7307K
代理商： MC9S12KC128CPU
Device User Guide — 9S12KT256DGV1/D V01.09
99
Freescale Semiconductor
1.
A current is injected into the channel being converted. The channel being stressed has conversion
values of $3FF ($FF in 8-bit mode) for analog inputs greater than VRH and $000 for values less
than VRL unless the current is higher than specified as disruptive conditions.
2.
Current is injected into pins in the neighborhood of the channel being converted. A portion of this
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
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-13 ATD Electrical Characteristics
A.5.3 ATD accuracy
Table A-14
and
Table A-15
specify the ATD conversion performance excluding any errors due to
current injection, input capacitance and source resistance.
Table A-14 5V ATD Conversion Performance
Conditions are shown in
Table A-4
unless otherwise noted
Num
Rating
Symbol
Min
Typ
Max
Unit
1
Max input Source Resistance
R
S
-
-
1
K
2
Total Input Capacitance
Non Sampling
Sampling
C
INN
C
INS
10
22
pF
3
Disruptive Analog Input Current
I
NA
-2.5
2.5
mA
4
Coupling Ratio positive current injection
K
p
10
-4
A/A
5
Coupling Ratio negative current injection
K
n
10
-2
A/A
Conditions are shown in
Table A-4
unless otherwise noted
V
REF
= V
RH
- V
RL
= 5.12V. Resulting to one 8 bit count = 20mV and one 10 bit count = 5mV
f
ATDCLK
= 2.0MHz
Num
C
Rating
Symbol
Min
Typ
Max
Unit
1
P 10-Bit Resolution
LSB
5
mV
2
P 10-Bit Differential Nonlinearity
DNL
–1
1
Counts
3
P 10-Bit Integral Nonlinearity
INL
–2.5
±
1.5
2.5
Counts
4
P 10-Bit Absolute Error
1
AE
-3
±
2.0
3
Counts
5
C 10-Bit Absolute Error at f
ATDCLK
= 4MHz
AE
±
7.0
Counts
6
P 8-Bit Resolution
LSB
20
mV
7
P 8-Bit Differential Nonlinearity
DNL
–0.5
0.5
Counts
8
P 8-Bit Integral Nonlinearity
INL
–1.0
±
0.5
1.0
Counts
9
P 8-Bit Absolute Error
(1)
AE
-1.5
±
1.0
1.5
Counts
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