參數(shù)資料
型號: 9S12KT256DGV1
英文描述: MC9S12KT256 Device User Guide
中文描述: MC9S12KT256設(shè)備用戶指南
文件頁數(shù): 97/126頁
文件大?。?/td> 7307K
代理商: 9S12KT256DGV1
Device User Guide — 9S12KT256DGV1/D V01.09
97
Freescale Semiconductor
A.5 ATD Characteristics
This section describes the characteristics of the analog to digital converter.
A.5.1 ATD Operating Characteristics
The
Table A-11
shows conditions under which the ATD operates.
The following constraints exist to obtain full-scale, full range results:
VSSA
VRL
VIN
VRH
VDDA
.
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-11 5V ATD Operating Characteristics
Conditions are shown in
Table A-4
unless otherwise noted
Num C
Rating
Symbol
Min
Typ
Max
Unit
1
D
Reference Potential
Low
High
VRL
VRH
VSSA
VDDA/2
VDDA/2
VDDA
V
V
2
C Differential Reference Voltage
1
NOTES
:
1. Full accuracy is not guaranteed when differential voltage is less than 4.75V
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.
3. Reduced accuracy see
Table A-14
and
Table A-15
.
VRH-VRL
4.75
5.0
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
Conv, Time at 4.0MHz
3
ATD Clock f
ATDCLK
N
CONV10
T
CONV10
T
CONV10
14
7
3.5
28
14
7
Cycles
μ
s
μ
s
5
D
ATD 8-Bit Conversion Period
Clock Cycles
(1)
Conv, Time at 2.0MHz ATD Clock f
ATDCLK
N
CONV8
T
CONV8
12
6
26
13
Cycles
μ
s
6
D Stop Recovery Time (V
DDA
=5.0 Volts)
t
SR
I
REF
I
REF
20
μ
s
7
P Reference Supply current (two ATD modules)
0.750
mA
8
P Reference Supply current (one ATD module)
0.375
mA
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