HD3SS3411-Q1

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SLASE82A – JUNE 2015 – REVISED JULY 2015

Detailed Design Procedure (continued)

In Figure 5, the coupling capacitors are placed on the host transmit pair and endpoint transmit pair. In this

situation, the switch on the top is biased by the endpoint and the lower switch is biased by the host controller.

Figure 5. AC Coupling Capacitors on Host TX and Endpoint TX

If the common mode voltage in the system is higher than 2 V, the coupling capacitors are placed on both sides of

the switch (shown in Figure 6). A biasing voltage of less than 2 V is required in this case.

Figure 6. AC Coupling Capacitors on Both Sides of Switch

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