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AD9136 JESD204B PCB Skew Tolerances

rdb9879
on Jan 14, 2021

When routing traces for the JESD204B lanes of the AD9136, what is the maximum skew tolerance? I'm in Mode 11.

I know the datasheet talks about a link-to-link tolerance of 15mm, but I wasn't sure if that applies to the lane-to-lane tolerance, or even between the differential pairs?

What is the maximum skew allowed between two lanes, and what is the maximum skew allowed between the 2 traces (differential pair) of a single lane?

Thanks.

  • 0
    •  Analog Employees 
    on Feb 8, 2021 8:24 PM 17 days ago

    Hello,

    Single link interconnect skew is defined as the maximum difference in propagation time between any two lanes of a link or a multipoint link in the JESD204B standard.  The budget for this "lane-to-lane" skew is defined in table 9 of the standard and pasted in here:

    I believe the 15mm (or 12.5mm?) number was intended to refer to the intra-pair skew.

    Regards,

    Del