參數(shù)資料
型號： MC9S12DP512CFU
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： Microcontroller Unit (MCU)
中文描述： 微控制器（MCU）
文件頁數(shù)： 95/124頁
文件大?。?/td> 2125K
代理商： MC9S12DP512CFU
95
A.2 ATD Characteristics
This section describes the characteristics of the analog to digital converter.
A.2.1 ATD Operating Characteristics
The
Table A-8
shows conditions under which the ATD operates.
The following constraints exist to obtain full-scale, full range results:
V
SSA
≤
V
RL
≤
V
IN
≤
V
RH
≤
V
DDA
.
This constraint exists since the sample buffer amplifier can not drive
beyond the power supply levels that it ties to. If the input level goes outside of this range it will effectively
be clipped.
Table A-8 ATD Operating Characteristics
A.2.2 Factors influencing accuracy
Three factors - source resistance, source capacitance and current injection - have an influence on the
accuracy of the ATD.
A.2.2.1 Source Resistance
Due to the input pin leakage current as specified in
Table A-6
in conjunction with the source resistance
there will be a voltage drop from the signal source to the ATD input. The maximum source resistance R
S
Conditions are shown in
Table A-4
unless otherwise noted
Num C
Rating
Symbol
Min
Typ
Max
Unit
1
D
Reference Potential
Low
High
V
RL
V
RH
V
SSA
V
DDA
/2
-
V
DDA
/2
V
DDA
V
V
2
C Differential Reference Voltage
1
NOTES
:
1. Full accuracy is not guaranteed when differential voltage is less than 4.50V
2. The minimum time assumes a final sample period of 2 ATD clocks cycles while the maximum time assumes a final sample
period of 16 ATD clocks.
V
RH
-V
RL
4.50
5.00
5.25
V
3
D ATD Clock Frequency
f
ATDCLK
0.5
-
2.0
MHz
4
D
ATD 10-Bit Conversion Period
Clock Cycles
2
Conv, Time at 2.0MHz ATD Clock f
ATDCLK
N
CONV10
T
CONV10
14
7
-
28
14
Cycles
μ
s
5
D
ATD 8-Bit Conversion Period
Clock Cycles
(2)
Conv, Time at 2.0MHz ATD Clock f
ATDCLK
N
CONV8
T
CONV8
12
6
-
26
13
Cycles
μ
s
6
D Recovery Time (V
DDA
=5.0 Volts)
t
REC
-
-
20
μ
s
7
P Reference Supply current 2 ATD blocks on
I
REF
-
-
0.750
mA
8
P Reference Supply current 1 ATD block on
I
REF
-
-
0.375
mA
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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