TLK10031 Datasheet, PDF (135/146 Pages) Texas Instruments – TLK10031 Single-Channel XAUI/10GBASE-KR Transceiver

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TLK10031
SLLSEL3A – JULY 2015 – REVISED AUGUST 2015
8.2.1 Design Requirements
For this design example, use the parameters shown in Table 8-1.
Table 8-1. Design Parameters
PARAMETER
10GBASE-KR Interface Requirements
Signaling rate
Differential peak-to-peak output voltage (maximum)
Total jitter (maximum)
Encoding
Scrambling?
Auto-negotation?
Link training
XAUI Interface Requirements
Signaling rate per lane
Differential peak-to-peak output voltage (maximum)
Total jitter (maximum)
VALUE
10.3125 Gbps ±100 ppm
1200 mV
0.28 UI
64b/66b
Yes
Yes
Yes
3.125 Gbps ±100 ppm
1600 mV
0.35 UI
8.2.2 Detailed Design Procedure
The TLK10031 should be powered via a 1-V (nominal) supply on the VDDD, VDDA, DVDD, VDDT, and
VPP rails and by a 1.5-V or 1.8-V (nominal) supply on the VDDR and VDDO rails. The power supply
accuracy should be 5% or better, and the user should be careful that resistive losses across the
application PCB’s power distribution network do not cause the voltage present at the TLK10031 BGA balls
to be below specification. If a switched-mode power supply is used, care should be taken to ensure low
supply ripple
A differential reference clock must be provided to either the REFCLK0P/N or REFCLK1P/N input port. The
clock signal should be AC-coupled and have a differential amplitude between 250 mV and 2000 mV peak-
to-peak. For 10GBASE-R applications, the clock frequency should be either 156.25 MHz or 312.5 MHz
and have an accuracy of 100 ppm. Because jitter on the reference clock can transfer through the
TLK10031 PLLs and onto the serial outputs, it is best to keep the reference clock’s jitter as low as
possible (that is, under 1 ps from 10 kHz to 20 MHz) in order to meet the requirements of IEEE 802.3.
All serial inputs and outputs should be laid out on the PCB following best practices for high speed signal
integrity. Detailed layout recommendations are given in the Section 10 section.
Copyright © 2015, Texas Instruments Incorporated
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Applications and Implementation 135