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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)： | 20/122頁 |
| 文件大?。?/td> | 940K |
| 代理商： | QADCRM |
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MOTOROLA
2-4
SIGNAL DESCRIPTIONS
QADC
REFERENCE MANUAL
2.6 Voltage Reference Pins
V
RH
and V
RL
are the dedicated input pins for the high and low reference voltages. Sep-
arating the reference inputs from the power supply pins allows for additional external
filtering, which increases reference voltage precision and stability, and subsequently
contributes to a higher degree of conversion accuracy. Refer to
APPENDIX A ELEC-
TRICAL CHARACTERISTICS
for more information.
2.7 Dedicated Analog Supply Pins
V
DDA
and V
SSA
pins supply power to the analog subsystems of the QADC module.
Dedicated power is required to isolate the sensitive analog circuitry from the normal
levels of noise present on the digital power supply. Refer to
APPENDIX A ELECTRI-
CAL CHARACTERISTICS
for more information.
2.8 External Digital Supply Pin
Each port A pin includes a digital open drain output driver, as well as an analog input
signal path and a digital input synchronizer. The V
SSE
pin provides the ground level
for the drivers on the port A pins. Since the QADC output pins have open drain type
drivers, a dedicated V
DDE
pin is not needed. Refer to
APPENDIX A ELECTRICAL
CHARACTERISTICS
for more information.
2.9 Internal Digital Supply Pins
V
DDI
and V
SSI
pins provide the power for the digital portions of the QADC, and for all
other digital modules on the microcontroller chip. Since these pins are common to all
modules, they are not counted as QADC pins. Refer to
APPENDIX A ELECTRICAL
CHARACTERISTICS
for more information.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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