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參數(shù)資料
| 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)： | 35/122頁 |
| 文件大?。?/td> | 940K |
| 代理商： | QADCRM |
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QADC
REFERENCE MANUAL
PIN CONNECTION CONSIDERATIONS
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
5-3
Figure 5-2 Errors Resulting from Clipping
5.3 Analog Supply Filtering and Grounding
Two important factors influencing performance in analog integrated circuits are supply
filtering and grounding. Generally, digital circuits use bypass capacitors on every V
DD
/
V
SS
pin pair. This applies to analog subsystems or submodules also. Equally important
as bypassing is the distribution of power and ground.
Analog supplies should be isolated from digital supplies as much as possible. This ne-
cessity stems from the higher performance requirements often associated with analog
circuits. Therefore, deriving an analog supply from a local digital supply is not recom-
mended. However, if for economic reasons digital and analog power are derived from
a common regulator, filtering of the analog power is recommended in addition to the
bypassing of the supplies already mentioned. For example, an RC low pass filter could
be used to isolate the digital and analog supplies when generated by a common reg-
ulator. If multiple high precision analog circuits are locally employed (i.e. two A/D con-
verters), the analog supplies should be isolated from each other as sharing supplies
introduces the potential for interference between analog circuits.
Grounding is the most important factor influencing analog circuit performance in mixed
signal systems (or in standalone analog systems). Close attention must be paid not to
introduce additional sources of noise into the analog circuitry. Common sources of
noise include ground loops, inductive coupling, and combining digital and analog
grounds together inappropriately.
QADC CLIPPING
0
.020
5.100
5.110
INPUT IN VOLTS (V
RH
= 5.120 V, V
RL
= 0 V)
1
2
3
4
5
6
7
8
3FA
3FB
3FC
3FD
3FE
3FF
.010
.030
5.120
5.130
1
F
Freescale Semiconductor, Inc.
n
.
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