參數(shù)資料
型號(hào): 9S12XDP512DGV1
英文描述: Device User Guide for Mask Set 0L40V ( First Silicon)
中文描述: 設(shè)備用戶指南掩模組0L40V(第一硅)
文件頁(yè)數(shù): 122/152頁(yè)
文件大?。?/td> 1231K
代理商: 9S12XDP512DGV1
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M
MC9S12XDP512 Device User Guide — V01.12
122
Table A-11 ATD Operating Characteristics 3.3V
Conditions are shown in
Table A-4
unless otherwise noted, Supply Voltage 3.3V < VDDA < 3.6V
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-7
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
specifies results in an error of less than 1/2 LSB (2.5mV) at the maximum leakage current. If device or
operatingconditionsarelessthanworstcaseorleakage-inducederrorisacceptable,largervaluesofsource
resistance is allowed.
A.2.2.2 Source Capacitance
When sampling an additional internal capacitor is switched to the input. This can cause a voltage drop due
to charge sharing with the external and the pin capacitance. For a maximum sampling error of the input
voltage
1LSB, then the external filter capacitor, C
f
1024 * (C
INS
- C
INN
).
A.2.2.3 Current Injection
There are two cases to consider.
Num C
Rating
Symbol
Min
Typ
Max
Unit
1
D
Reference Potential
Low
High
V
RL
V
RH
V
SSA
V
DDA
/2
3.0
V
DDA
/2
V
DDA
3.6
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
f
ATDCLK
3.3
V
3
D ATD Clock Frequency
0.5
TBD
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
TBD
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
TBD
26
13
Cycles
μ
s
6
D Recovery Time (V
DDA
=5.0 Volts)
t
REC
I
REF
I
REF
20
μ
s
7
P
Reference Supply current 2 ATD blocks on
0.500
mA
8
P
Reference Supply current 1 ATD block on
0.250
mA
F
For More Information On This Product,
Go to: www.freescale.com
n
.
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