HD3SS3411-Q1 Datasheet, PDF (10/23 Pages) Texas Instruments – One Channel Differential 2:1 Mux/Demux

HD3SS3411-Q1
SLASE82A – JUNE 2015 – REVISED JULY 2015
9.3 Design Requirements
For this design example, use the values shown in Table 3.
Table 3. Design Paramerters
PARAMETER
V_CC voltage
Ap/n, Bp/n, Cp/n CM input voltage
SEL/OEn pin max voltage for low
SEL/OEn pin min voltage for high
VALUE
3.3 V
0 V to 2 V
0V
3.3 V
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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
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