參數(shù)資料
型號： QADCRM
英文描述： Queued Analog-to-Digital Converter Reference Manual
中文描述： 排隊模擬到數(shù)字轉(zhuǎn)換器參考手冊
文件頁數(shù)： 97/122頁
文件大?。?/td> 940K
代理商： QADCRM
QADC
REFERENCE MANUAL
ELECTRICAL CHARACTERISTICS
MOTOROLA
A-1
APPENDIX A ELECTRICAL CHARACTERISTICS
NOTES:
1. Below disruptive current conditions, the channel being stressed has conversion values of $3FF for analog in-
puts greater than V
RH
and $000 for values less than V
RL
. This assumes that V
RH
≤
V
DDA
and V
RL
≥
V
SSA
due
to the presence of the sample amplifier. Other channels are not affected by non-disruptive conditions.
2. Input signals with large slew rates or high frequency noise components cannot be converted accurately. These
signals also affect the conversion accuracy of other channels.
3. Exceeding limit may cause conversion error on stressed channels and on unstressed channels. Transitions
within the limit do not affect device reliability or cause permanent damage.
4. Input must be current limited to the value specified. To determine the value of the required current-limiting re-
sistor, calculate resistance values using positive and negative clamp values, then use the larger of the calcu-
lated values.
5. This parameter is periodically sampled rather 100% tested.
6. Condition applies to one pin at a time.
7. Determination of actual maximum disruptive input current, which can affect operation, is related to external sys-
tem component values.
8. Current coupling is the ratio of the current induced from overvoltage (positive or negative, through an external
series coupling resistor), divided by the current induced on adjacent pins. A voltage drop may occur across the
external source impedances of the adjacent pins, impacting conversions on these adjacent pins.
Table A-1 QADC Maximum Ratings
Num
1
2
3
4
5
6
7
8
9
Parameter
Symbol
V
DDA
V
DDI
V
RH
V
SSI
– V
SSA
V
DDI
– V
DDA
V
RH
– V
RL
V
RH
– V
DDA
V
RL
– V
SSA
I
NA
Min
– 0.3
– 0.3
– 0.3
– 0.1
– 6.5
– 6.5
– 6.5
– 6.5
– 500
Max
6.5
6.5
6.5
0.1
6.5
6.5
6.5
6.5
500
Unit
V
V
V
V
V
V
V
V
μ
A
Analog Supply, with reference to V
SSA
Internal Digital Supply, with reference to V
SSI
Reference Supply, with reference to V
RL
V
SS
Differential Voltage
V
DD
Differential Voltage
V
REF
Differential Voltage
V
RH
to V
DDA
Differential Voltage
V
RL
to V
SSA
Differential Voltage
Disruptive Input Current
1,
2,
3,
4,
5,
6,
7
V
NEGCLAMP
= – 0.3 V
V
POSCLAMP
= 8 V
Positive Overvoltage Current
Coupling Ratio
1,
5,
6,
8
PQA
PQB
Negative Overvoltage Current
Coupling Ratio
1,
5,
6,
8
PQA
PQB
Maximum Input Current
3,
4,
6
V
NEGCLAMP
= – 0.3 V
V
POSCLAMP
= 8 V
10
K
P
2000
2000
—
—
11
K
N
125
500
– 25
—
—
12
I
MA
25
mA
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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