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| 型號(hào)： | QADCRM |
| 英文描述： | Queued Analog-to-Digital Converter Reference Manual |
| 中文描述： | 排隊(duì)模擬到數(shù)字轉(zhuǎn)換器參考手冊(cè) |
| 文件頁數(shù)： | 36/122頁 |
| 文件大?。?/td> | 940K |
| 代理商： | QADCRM |
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MOTOROLA
5-4
PIN CONNECTION CONSIDERATIONS
For More Information On This Product,
Go to: www.freescale.com
QADC
REFERENCE MANUAL
The problem of how and when to combine digital and analog grounds arises from the
large transients which the digital ground must handle. If the digital ground is not able
to handle the large transients, the current from the large transients can return to
ground through the analog ground. It is the excess current overflowing into the analog
ground which causes performance degradation by developing a differential voltage
between the true analog ground and the microcontroller’s ground pin. The end result
is that the ground observed by the analog circuit is no longer true ground and often
ends in skewed results.
Two similar approaches designed to improve or eliminate the problems associated
with grounding excess transient currents involve star-point ground systems. One ap-
proach is to star-point the different grounds at the power supply origin, thus keeping
the ground isolated. Refer to
Figure 5-3
.
Figure 5-3 Star-Ground at the Point of Power Supply Origin
Another approach is to star-point the different grounds near the analog ground pin on
the microcontroller by using small traces for connecting the non-analog grounds to the
analog ground. The small traces are meant only to accommodate DC differences, not
AC transients.
NOTE
This star-point scheme still requires adequate grounding for digital
and analog subsystems in addition to the star-point ground.
QADC
V
V
V
V
VDD
VSS
ANALOG POWER SUPPLY
+5V
+5V
AGND
DIGITAL POWER SUPPLY
+5V
PGND
PCB
QADC POWER SCHEM
F
Freescale Semiconductor, Inc.
n
.
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