System/Host

controller

RX

TX

Device/

Endpoint

RX

TX

Device/

Endpoint

RX

Port B

Port B

Port C

Port C

TX

System/Host

controller

RX

Device/

Endpoint

RX

Device/

Endpoint

RX

Port B

Port B

Port C

Port C

TX

TX

TX

12

HD3SS3202

SLASEO1 – MAY 2018

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Application Information (continued)

In Figure 6, the coupling capacitors are placed on the host transmit pair and endpoint transmit pair. In this

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

Figure 6. 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 7). A biasing voltage of < 2 V is required in this case.

Capacitor and resistor values depend upon application.

Figure 7. AC Coupling Capacitors on Both Sides of Switch