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AOZ8007FI Datasheet(PDF) 7 Page - Alpha & Omega Semiconductors |
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AOZ8007FI Datasheet(HTML) 7 Page - Alpha & Omega Semiconductors |
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7 / 14 page  Rev. 2.1 August 2008 www.aosmd.com Page 7 of 14 AOZ8007 Figure 6. 140 Ω Differential Impedance Max 102 Ω, Min 92Ω Figure 7. 160 Ω Differential Impedance Max 123 Ω, Min 109Ω Figure 8. Differential Impedance By adding a TVS onto the traces it can have a large effect on the impedance of the line. This addition of a capacitance added to a 100 Ω differential transmission line without any compensation may decrease the impedance as much as 20 Ω or more. Below is a formula to calculate the length for the compensation of C(TVS). Figure 7. Z0 is the normal 61Ω differential impedance on the trace. Z1 is the needed impedance to compensate for the added C(TVS) K is defined as the unloaded impedance of the adjusted trace. X is the length of the trace needed for the compensation. τ is the propagation delay time required for a signal to travel from one point to another. This value should be less than 200pS. From the above method the designer should layout the boards with a 50 Ω common mode trace. The result should give you approximately 100 Ω differential imped- ance. Z1 is the impedance that you choose in order to compensate the TVS capacitance. Based on Z1 value, we can get the length of the segment from the above equations. With the value of Z1 = 80Ω, Zo = 61Ω, C(TVS) = 0.94 and τ = 180. The X(mils) equates to 580 mils. Page 8 has a series of graph that represent changing width and length of the trace from 50 Ω to 80Ω in increment of 10 Ω with a MSOP-10 package solder onto the board. As you can observe from the graphs, a small incremental capacitance that is added to the differential lines can significantly decrease the differential imped- ance. Thus violated the HDMI specification of 100 Ω±15%. 140 120 100 80 60 40 20 0 50 55 60 65 70 75 80 Common Mode Impedance ( Ω) Max. Min. X Zo = 61 Ω Zo = 61 Ω Z1 C(TVS) K Z 1 Z 0 ------ = (5) X Z 0CTVS τ --------------------- K K 2 1 – ---------------- = (6) |
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