参数资料
型号: MC9S12KG32MFU
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80
封装: QFP-80
文件页数: 125/126页
文件大小: 6758K
代理商: MC9S12KG32MFU
Device User Guide — 9S12KT256DGV1/D V01.09
98
Freescale Semiconductor
Table A-12 3.3V ATD Operating Characteristics
A.5.2 Factors influencing accuracy
Three factors - source resistance, source capacitance and current injection - have an influence on the
accuracy of the ATD.
A.5.2.1 Source Resistance:
Due to the input pin leakage current as specified in Table A-6 and Table A-7in conjunction with the
source resistance there will be a voltage drop from the signal source to the ATD input. The maximum
source resistance RS specifies results in an error of less than 1/2 LSB (2.5mV) at the maximum leakage
current. If device or operating conditions are less than worst case or leakage-induced error is acceptable,
larger values of source resistance are allowed.
A.5.2.2 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 * (CINS- CINN).
A.5.2.3 Current injection
There are two cases to consider.
Conditions are shown in Table A-4 unless otherwise noted; Supply Voltage 3.3V-10% <= VDDA <= 3.3V+10%
Num C
Rating
Symbol
Min
Typ
Max
Unit
1
D
Reference Potential
Low
High
VRL
VRH
VSSA
VDDA/2
VDDA
V
2
C Differential Reference Voltage
VRH-VRL
3.0
3.3
3.6
V
3
D ATD Clock Frequency
fATDCLK
0.5
2.0
MHz
4
D
ATD 10-Bit Conversion Period
Clock Cycles1
Conv, Time at 2.0MHz ATD Clock fATDCLK
Conv, Time at 4.0MHz2 ATD Clock fATDCLK
NOTES:
1. 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.
2. Reduced accuracy see Table A-14 and Table A-15.
NCONV10
TCONV10
14
7
3.5
28
14
7
Cycles
s
5
D
ATD 8-Bit Conversion Period
Clock Cycles(1)
Conv, Time at 2.0MHz ATD Clock fATDCLK
NCONV8
TCONV8
12
6
26
13
Cycles
s
6
D Recovery Time (VDDA=3.3 Volts)
tREC
20
s
7
P
Reference Supply current (two ATD modules)
IREF
0.500
mA
8
P
Reference Supply current (one ATD module)
IREF
0.250
mA
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