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Posts: 4
Registered: ‎04-26-2016

Using Si5338 for dynamically changing refclk for GTX Transceiver?

We are using the Kintex Ultrascale and hoping to recover the GTX transceiver output clock, route it through the Si 5338 for cleaning and submit that as a reference clock.  We have found precedent using the Si5324 and its Hitless Switching with Phase Built-Out feature.  This is described more in the post from Xilinx.

 

https://forums.xilinx.com/t5/7-Series-FPGAs/How-to-change-dynamically-the-reference-clock-of-GTX-Tra...

 

Will this work with the Si5338?  Is there a better part Si Labs recommends for this type of design strategy?

Posts: 37
Registered: ‎06-16-2014

Re: Using Si5338 for dynamically changing refclk for GTX Transceiver?

The Si5338 is a clock generator with a relatively high loop bandwidth and as such is not intended to specifically perform jitter attenuation (i.e. clock cleaning). We do have a full portfolio of jitter attenuators. Take a look at the Si5342/44/45 family of devices. The Si534x jitter attenuators are our latest generation of high-performance jitter attenuators.

 

http://www.silabs.com/products/timing/clock-generator/si5342-44-45-46-47/pages/si5342-44-45-46-47.as...