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| 型號(hào)： | EVAL-ADUC842QS |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 73/88頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT DEV FOR ADUC842 QUICK START |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuickStart™ 套件 |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | ADuC842 |
| 所含物品： | 評(píng)估板、電源、纜線、軟件和說明文檔 |
| 產(chǎn)品目錄頁面： | 739 (CN2011-ZH PDF) |
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ADuC841/ADuC842/ADuC843
Rev. 0 | Page 75 of 88
5 V Part
For DVDD below 4.5 V, the internal POR holds the part in reset.
As DVDD rises above 4.5 V, an internal timer times out for
approximately 128 ms before the part is released from reset. The
user must ensure that the power supply has reached a stable
4.75 V minimum level by this time. Likewise on power-down,
the internal POR holds the part in reset until the power supply
has dropped below 1 V. Figure 83 illustrates the operation of the
internal POR in detail.
128ms
1.0V
128ms
4.75V
1.0V TYP
INTERNAL
CORE RESET
DVDD
03260-0-096
Figure 83. Internal POR Operation
Grounding and Board Layout Recommendations
As with all high resolution data converters, special attention
must be paid to grounding and PC board layout of ADuC841/
ADuC842/ADuC843 based designs to achieve optimum
performance from the ADC and the DACs. Although the parts
have separate pins for analog and digital ground (AGND and
DGND), the user must not tie these to two separate ground
planes unless the two ground planes are connected together
very close to the part, as illustrated in the simplified example of
Figure 84a. In systems where digital and analog ground planes
are connected together somewhere else (for example, at the
system’s power supply), they cannot be connected again near the
part since a ground loop would result. In these cases, tie all the
part’s AGND and DGND pins to the analog ground plane, as
illustrated in Figure 84b. In systems with only one ground plane,
ensure that the digital and analog components are physically
separated onto separate halves of the board such that digital
return currents do not flow near analog circuitry and vice versa.
The part can then be placed between the digital and analog
sections, as illustrated in Figure 84c.
In all of these scenarios, and in more complicated real-life
applications, keep in mind the flow of current from the supplies
and back to ground. Make sure the return paths for all currents
are as close as possible to the paths that the currents took to
reach their destinations. For example, do not power components
on the analog side of Figure 84b with DVDD since that would
force return currents from DVDD to flow through AGND. Also,
try to avoid digital currents flowing under analog circuitry,
which could happen if the user places a noisy digital chip on the
left half of the board in Figure 84c. Whenever possible, avoid
large discontinuities in the ground plane(s) (like those formed
by a long trace on the same layer), since they force return
signals to travel a longer path. And of course, make all connec-
tions to the ground plane directly, with little or no trace
separating the pin from its via to ground.
If the user plans to connect fast logic signals (rise/fall time <
5 ns) to any of the part’s digital inputs, a series resistor should be
added to each relevant line to keep rise and fall times longer
than 5 ns at the part’s input pins. A value of 100 or 200 is
usually sufficient to prevent high speed signals from coupling
capacitively into the part and from affecting the accuracy of
ADC conversions.
DGND
AGND
PLACE ANALOG
COMPONENTS
HERE
PLACE DIGITAL
COMPONENTS
HERE
GND
PLACE ANALOG
COMPONENTS
HERE
PLACE DIGITAL
COMPONENTS
HERE
DGND
a.
AGND
PLACE ANALOG
COMPONENTS
HERE
PLACE DIGITAL
COMPONENTS
HERE
b.
c.
03260-0-083
Figure 84. System Grounding Schemes
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-ADUC842QS1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSP1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSP2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSPZ | 功能描述:KIT DEV QUICK START ADUC842 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ PLUS 套件 標(biāo)準(zhǔn)包裝:1 系列:PICDEM™ 類型:MCU 適用于相關(guān)產(chǎn)品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產(chǎn)品目錄頁面:659 (CN2011-ZH PDF) |
| EVAL-ADUC842QS-U | 制造商:Analog Devices 功能描述:TOOLS:DEVELOPMENT BOARDS H/W 制造商:Analog Devices 功能描述:QUICK START DEVELOPMENT SYSTEM - Bulk |
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