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LMH0046 Reclocker Does really it work?

Other Parts Discussed in Thread: LMH0030, LMH0046, LMH0034, LMH0376

I have an in-house developed board that uses a LMH0046 reclocker on the output of a LMH0030 serializer. After getting a series of jitter complaints, I rented a video analyzer and discovered that the LMH0046 is not reducing the jitter in the 100KHz range. It appears to be neutral at best. I then tested a third party reclocker product that uses the LMH0034 line equalizer followed by a LMH0046 reclocker (This arrangement is specifically described in the documentation). We inserted a jitter of 0.34UI and to our surprise, got a 0.34UI jitter out. The documentation clearly indicates that it should reduce a 0.75UI jitter to 0.05UI. 

Does this part really work?

How do we interface the parts so that it does work?

  • We too had jitter problems from the LMH0030 (caused mainly by excessive jitter on our input signal to VCLK).  As a work-around we tried shoehorning a LMH0046 on to the output, which improved the reliability of the video signal marginally.  We also invested in an eval board SD3GDA-III which is supposed to demonstrate the capabilities of the LMH0376 (a 3G version of the 0046, I believe).  We have an ancient LeCroy scope we we use to measure the jitter.  This seems to show that the reclocker is not doing much.