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Impact of unconnected LTC6952 charge pump pin on JESD link behaviour

Thread Summary

The user inquired about the impact of leaving the CP pin unconnected in an LTC6952-based clock distribution circuit on the stability of a JESD204B subclass 1 link. The final answer suggests that if the external source is frequency locked, it might be acceptable, but recommends using the HMC7043 for new designs. The CP pin and PLL activation are important for phase alignment and stability, and the user should connect the CP pin as shown in the design example.
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Category: Hardware

Hello all,

We are working on a custom board consisting of JESD204B (subclass1) link between Xilinx Kintex Ultrascale and AD9162.

the hardware design is based on example found in LTC6952 datasheet:

but in our hardware design, CP pin of LTC6952 is unconnected

my qyestion is: does the unconnected CP pin impact the subclass1 JESD link stability (in terms of phase alignment between SYSREFs and device clocks as example) ? and how to deal with that to ensure the stability of JESD204b subclass1 ?

Thanks

A.B.

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