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參數資料
| 型號： | AD9875BSTRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通信及網絡 |
| 英文描述： | Broadband Modem Mixed-Signal Front End |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP48 |
| 封裝： | LQFP-48 |
| 文件頁數： | 24/24頁 |
| 文件大小： | 288K |
| 代理商： | AD9875BSTRL |
–24–
C
P
REV. 0
T he AVDD and DVDD power planes may be fed from the same
low noise voltage source; however, they should be decoupled
from each other to prevent the noise generated in the DVDD
portion of the MxFE from corrupting the AVDD supply. T his
can be done by using ferrite beads between the voltage source
and DVDD, and between the source and AVDD. Both DVDD
and AVDD should have a low ESR, bulk decoupling capacitor
on the MxFE side of the ferrite as well as a low ESR, ESL
decoupling capacitors on each supply pin (i.e., the AD9875
requires five power supply decoupling caps, one each on Pins 5,
38, 47, 14, and 35). T he decoupling caps should be placed as close
to the MxFE supply pins as possible. An example of the proper
decoupling is shown in the AD9875 evaluation board schematic.
Ground Planes
In general, if the component placing guidelines discussed earlier
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. T his will result in the lowest impedance
return paths, and the quietest ground connections.
If the components cannot be placed in a manner that will keep
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. T hese current
steering channels should be made only when and where necessary.
Signal Routing
T he digital Rx and T x signal paths should be kept as short as
possible. Also, the impedance of these traces should have a
controlled characteristic impedance of about 50
. T his will
prevent 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 about 1.5 inches, then
series-termination resistors (33
to 47
) should be placed
close to all signal sources. It is a good idea to series-terminate all
clock signals at their source, regardless of trace length.
T he receive Rx
±
signals are the most sensitive signals on the
entire board. Careful routing of these signals is essential for good
receive path performance. T he 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 will
appear as common-mode and will be largely rejected by the
MxFE receive input. K eeping the driving point impedance of
the receive signal low and placing any low-pass filtering of the
signals close to the MxFE will further reduce the possibility of
noise corrupting these signals.
OUT LINE DIME NSIONS
Dimensions shown in inches and (mm).
AD9875
48-Lead LQFP
(ST -48)
0.039 (1.00)
REF
(PINS DOWN)
1
12
13
25
24
36
37
48
0.011 (0.27)
0.009 (0.22)
0.007 (0.17)
0.019 (0.50)
BSC
0.276
(7.00)
BSC
SQ
0.354 (9.00)
BSC SQ
SEATING
PLANE
0.063 (1.60)
MAX
0.030 (0.75)
0.024 (0.60)
0.018 (0.45)
VIEW A
7
3.5
0
0.008 (0.20)
0.004 (0.09)
0.057 (1.45)
0.055 (1.40)
0.053 (1.35)
0.006 (0.15)
0.002 (0.05)
0.003 (0.08)
MAX
VIEW A
ROTATED 90 CCW
CONTROLLING DIMENSIONS ARE IN MILLIMETERS.
相關PDF資料 |
PDF描述 |
|---|---|
| AD9875 | Broadband Modem Mixed-Signal Front End |
| AD9875-EB | Broadband Modem Mixed-Signal Front End |
| AD9875BST | Broadband Modem Mixed-Signal Front End |
| AD9876 | Broadband Modem Mixed-Signal Front End |
| AD9876-EB | Broadband Modem Mixed-Signal Front End |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9875BSTZ | 制造商:Analog Devices 功能描述:Modem Chip Single 48-Pin LQFP |
| AD9875-EB | 制造商:Analog Devices 功能描述: |
| AD9876 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Broadband Modem Mixed-Signal Front End |
| AD9876ABST | 制造商:Rochester Electronics LLC 功能描述:12B BROADBAND MODEM MXFE CONVERTER - Tape and Reel 制造商:Analog Devices 功能描述: |
| AD9876ABSTRL | 制造商:Rochester Electronics LLC 功能描述:12B BROADBAND MODEM MXFE CONVERTER - Tape and Reel 制造商:Analog Devices 功能描述: |
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