DS125DF1610 Datasheet, PDF (71/81 Pages) Texas Instruments – 9.8 to 12.5 Gbps 16-Channel Retimer

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Typical Applications (continued)
DS125DF1610
SNLS482A – APRIL 2014 – REVISED DECEMBER 2015
RX_0A
RX_0B
RX_1A
RX_1B
DS125DF1610 High
Speed Connections
Quad 0
Cross Point Switch
TX_0A
TX_0B
TX_1A
TX_1B
RX_2A
RX_2B
RX_3A
RX_3B
RX_4A
RX_4B
RX_5A
RX_5B
Quad 1
Cross Point Switch
Quad 2
Cross Point Switch
TX_2A
TX_2B
TX_3A
TX_3B
TX_4A
TX_4B
TX_5A
TX_5B
RX_6A
RX_6B
RX_7A
RX_7B
Quad 3
Cross Point Switch
TX_6A
TX_6B
TX_7A
TX_7B
Figure 7. Typical Connection Diagram: High Speed Signals
8.2.1 Design Requirements
This section lists some critical areas for high speed printed circuit board design consideration and study.
• Utilize 100Ω differential impedance traces.
• Back-drill connector vias and signal vias to minimize stub length.
• Use reference plane vias to ensure a low inductance path for the return current.
• Place AC-Coupling capacitors for the transmitter links near the receiver for that channel.
• The maximum body size for AC-coupling capacitors is 0402.
8.2.2 Detailed Design Procedure
To begin the design process determine the following:
• Maximum power draw for PCB regulator selection. For this calculation use the CDR locking power number
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