8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

8.1 Application Information

Many interfaces require AC coupling between the source and sink. The 0402 capacitors are the preferred option

to provide AC coupling, and the 0603 size capacitors also work. The 0805 size capacitors and C-packs must be

avoided. When placing AC coupling capacitors symmetric placement is best. A capacitor value of 0.1 µF is best

and the value must be match for the ± signal pair. 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 must be provided. A few placement

options are shown below.

In Figure 8-1, the coupling capacitors are placed on the source pair. In this situation, the switch is biased by the

sink.

GPU/

Source A

GPU/

Source B

DAx(p)

DAx(n)

DBx(p)

DBx(n)

DCx(p)

DCx(n)

Control

HD3SS213

Dx_SEL

AUX_SEL

Sink

Copyright © 2016, Texas Instruments Incorporated

Figure 8-1. Source Biased by the Sink

In Figure 8-2, the coupling capacitors are placed between the switch and Sink. In this situation, the switch is

biased by the Source

HD3SS213

SLAS901C – DECEMBER 2016 – REVISED JANUARY 2021

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