參數(shù)資料
型號: 84221
英文描述: 84221 Quad 10/100 Mbps TX/FX/10BT (PHY) manual 1/99
中文描述: 84221四10/100 Mbps的TX/FX/10BT(PHY)的手冊1 / 99
文件頁數(shù): 49/70頁
文件大?。?/td> 1017K
代理商: 84221
MD400184/A
49
84221
A 0.01-0.1uF decoupling capacitor should be connected
between the VDD group and GND on each of the 4 sides
of the 84221 as close as possible to the device pins,
preferably within 0.5 in. The value should be chosen
depending on whether the noise from VDD-GND is high
or low frequency. A conservative approach would be to
use two decoupling capacitors on each side, one 0.1uf for
low frequencys, and one 0.001 uf for high frequency noise
on the power supply.
The VDD connection to the transmit transformer center
tap shown in Figures 12 and 13 must be well decoupled in
order to minimize common mode noise injection from the
supply into the twisted pair cable. It is recommended that
a 0.01 uF decoupling capacitor be placed between the
transformer center tap VDD connection and the 84221
GND plane. This decoupling capacitor should be
physically placed as close as possible to the transformer
center tap, preferably within 0.5 in.
The PCB layout and power supply decoupling discussed
above should provide sufficient decoupling to achieve the
following when measured at the device:
(1) the resultant AC noise voltage measured across
each VDD/GND set should be less than 100 mVpp,
(2) all VDD’s should be within 50 mVpp of each other,
and
(3) all GND’s should be within 50 mVpp of each other.
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