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HD3SS3411RWARQ1 Datasheet(PDF) 10 Page - Texas Instruments |
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HD3SS3411RWARQ1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 23 page HD3SS3411-Q1 SLASE82A – JUNE 2015 – REVISED JULY 2015 www.ti.com 9.3 Design Requirements For this design example, use the values shown in Table 3. Table 3. Design Paramerters PARAMETER VALUE VCC voltage 3.3 V Ap/n, Bp/n, Cp/n CM input voltage 0 V to 2 V SEL/OEn pin max voltage for low 0 V SEL/OEn pin min voltage for high 3.3 V 9.4 Detailed Design Procedure 9.4.1 AC Coupling Capacitors Many interfaces require AC coupling between the transmitter and receiver. The 0402 capacitors are the preferred option to provide AC coupling, and the 0603 size capacitors will also work. The 0805 size capacitors and C- packs should be avoided. When placing AC coupling capacitors symmetric placement is best. A capacitor value of 0.1 µF is best and the value should be match for the ± signal pair. The placement should be along the TX pairs on the system board, which are usually routed on the top layer of the board. There are several placement options for the AC coupling capacitors. Because the switch requires a bias voltage, the capacitors must only be placed on one side of the switch. If they are placed on both sides of the switch, a biasing voltage should be provided. A few placement options are shown below. In Figure 4, the coupling capacitors are placed between the switch and endpoint. In this situation, the switch is biased by the system/host controller. Figure 4. AC Coupling Capacitors Between Switch TX and Endpoint TX 10 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: HD3SS3411-Q1 |
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