DM9102DEP datasheet(64/70 Pages) DAVICOM

64 / 70 page

Final

Version: DM9102D-DS-F01

May 10, 2006

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 0.1μF or

0.01μF.

•

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

set

and

AVDD/AGND set should be less than 100m

Vpp.

•

The 0.1-0.01μF decoupling capacitor should be

connected between each DVDD/DGND 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

0.01

µF decoupling

capacitor should be placed between the center

tap

AVDD

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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