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AOZ8905 View Datasheet(PDF) - Alpha and Omega Semiconductor

Part Name
Description
View to exact match
AOZ8905
AOSMD
Alpha and Omega Semiconductor AOSMD
AOZ8905 Datasheet PDF : 0 Pages
AOZ8905
Based on the AOZ8905 SOT23-6 package design, a very
straight forward layout can be achieved. To give the TDR
an extra level of margin the traces may be compensated
to have a nominal impedance of 90throughout the
differential pair. To make the design perfect the added
capacitance of the device will have to be compensated
by the use of “Skinny Traces”. The skinny traces are a
narrow stripe line acting to lower the parasitic
capacitance on the differential stripe line. The
differential impedance of the USB 3.0 transmission line
becomes well centered to 90. A layout EM field
simulator is recommended before fabrication to insure a
perfect stripe line. With careful layout and placement of
the device, the AOZ8905 can protect the USB 3.0 data
line effectively and safely and meet the ESD immunity
requirements of the IEC61000-4-2, level 4, ±15kV air
discharge, ±8kV contact discharge.
Figure 4. HDMI PCB Layout with Compensated Traces
Number of Layers
Copper Trace Thickness
Dielectric Constant, εr
Overall Board Thickness
Dielectric Thickness Between
Top and Ground Layer
4
1.4 mils
4.6
62 mils
10 mils
Rev. 1.1 April 2010
www.aosmd.com
Page 6 of 10
 

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