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參數(shù)資料
| 型號(hào)： | DM9102DE |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SINGLE CHIP FAST ETHEMET NIC CONTROLLER |
| 中文描述： | 單晶片快速以太網(wǎng)NIC控制器 |
| 文件頁數(shù)： | 64/70頁 |
| 文件大小： | 2245K |
| 代理商： | DM9102DE |
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64
Preliminary datasheet
Version: DM9102D-DS-P02
Jan. 14, 2005
9.4 Power Supply Decoupling Capacitors
Place all the decoupling capacitors for all the
power supply pins as close as possible to the
power pads of the DM9102D (no more than
2.5mm from the pins mentioned above.) The
recommended decoupling capacitor is 0.1
0.01
F.
The decoupling of PCB layout and power supply
should provide sufficient decoupling to achieve
the following when measured at the device:
(1) All DVDDs and AVDDs should be within 50m
Vpp of each other,
(2) All DGNDs and AGNDs should be within 50m
Vpp of each other.
(3) The resultant AC noise voltage measured
across
each
DVDD/DGND
AVDD/AGND set should be less than 100m
Vpp.
The 0.1-0.01
F decoupling capacitor should be
connected between each DVDD/DGND set and
F or
set
and
AVDD/AGND set be placed as close as possible
to the pins of DM9102D. The conservative
approach is to use two decoupling capacitors on
each DVDD/DGND set and AVDD/AGND set.
The 0.1μF capacitor is used for low frequency
noise and the 0.01μF one is for high frequency
noise on the power supply.
The AVDD connection to the transmit center tap
of the magnetic has to be well decoupled to
minimize common mode noise injection from the
power supply into the twisted pair cable. It is
recommended that a 0.01
μ
F decoupling
capacitor should be placed between the center
tap AVDD to AGND ground plane. This
decoupling capacitor should be placed as close
as possible to the center tap of the magnetic.
Figure 9-3
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