参数资料
型号: MC9S12GC32CPB25
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, PQFP52
封装: LQFP-52
文件页数: 6/138页
文件大小: 2318K
代理商: MC9S12GC32CPB25
Device User Guide — 9S12C128DGV1/D V01.07
101
B.4.3.3 Current injection
There are two cases to consider.
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 VERR =K*RS *
IINJ, with IINJ being the sum of the currents injected into the two pins adjacent to the converted
channel.
Table B-5 ATD Electrical Characteristics
Conditions are shown in Table A-4 unless otherwise noted
Num
C
Rating
Symbol
Min
Typ
Max
Unit
1
C
Max input Source Resistance
RS
--
1
K
2T
Total Input Capacitance
Non Sampling
Sampling
CINN
CINS
10
15
pF
3
C
Disruptive Analog Input Current
INA
-2.5
2.5
mA
4
C
Coupling Ratio positive current injection
Kp
10-4
A/A
5
C
Coupling Ratio negative current injection
Kn
10-2
A/A
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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