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參數(shù)資料
| 型號： | AD9879BSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 22/32頁 |
| 文件大小： | 0K |
| 描述： | IC PROCESSOR FRONT END 100MQFP |
| 標準包裝： | 1 |
| 位數(shù)： | 12 |
| 通道數(shù)： | 5 |
| 功率（瓦特）： | 587mW |
| 電壓 - 電源，模擬： | 3.3V |
| 電壓 - 電源，數(shù)字： | 3.3V |
| 封裝/外殼： | 100-BQFP |
| 供應(yīng)商設(shè)備封裝： | 100-MQFP（14x20） |
| 包裝： | 托盤 |
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AD9879
Rev. A | Page 29 of 32
GROUND PLANES
In general, if the component placing guidelines discussed in the
Component Placement section can be implemented, it is best to
have at least one continuous ground plane for the entire board.
All ground connections should be made as short as possible.
This results in the lowest impedance return paths and the
quietest ground connections.
If the components cannot be placed in a manner that keeps the
high frequency ground currents from traversing under the
MxFE and analog components, it may be necessary to put
current steering channels into the ground plane to route the
high frequency currents around these sensitive areas. These
current steering channels should be made only when and where
necessary.
SIGNAL ROUTING
The digital Rx and Tx signal paths should be kept as short as
possible. Also, these traces should have a controlled impedance
of about 50 . This prevents poor signal integrity and the high
currents that can occur during undershoot or overshoot caused
by ringing. If the signal traces cannot be kept shorter than
approximately 1.5 inches, then series termination resistors
(33 to 47 ) should be placed close to all signal sources. It is
advisable to series terminate all clock signals at their source
regardless of trace length.
The receive (I IN, Q IN, and RF IN) signals are the most
sensitive signals on the entire board. Careful routing of these
signals is essential for good receive path performance. The Rx±
signals form a differential pair and should be routed together as
a pair. By keeping the traces adjacent to each other, noise
coupled onto the signals appears as common-mode and is
largely rejected by the MxFE receive input. Keeping the driving
point impedance of the receive signal low and placing any low-
pass filtering of the signals close to the MxFE further reduces
the possibility of noise corrupting these signals.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9879BSZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD9879-EB | 制造商:Analog Devices 功能描述:Evaluation Board For Mixed Signal Front End Set Top Box, Cable Modem 制造商:Analog Devices 功能描述:DEV TOOLS, MIXED SGNL FRONT END SET TOP , CBL MODEM - Bulk |
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| AD9880/PCBZ | 功能描述:KIT EVALUATION AD9880 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:Advantiv® 標準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
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