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Entry  Sat Feb 20 01:56:05 2010, Hao Huan, PLLLCK signal of DRS4 
    Reply  Sat Feb 20 09:54:48 2010, Stefan Ritt, PLLLCK signal of DRS4 start_1ghz.png
       Reply  Sun Feb 21 00:46:01 2010, Hao Huan, PLLLCK signal of DRS4 
          Reply  Sun Feb 21 13:47:03 2010, Stefan Ritt, PLLLCK signal of DRS4 
             Reply  Sun Feb 21 20:27:46 2010, Hao Huan, PLLLCK signal of DRS4 
                Reply  Sun Feb 21 20:33:57 2010, Stefan Ritt, PLLLCK signal of DRS4 
                   Reply  Mon Feb 22 17:23:59 2010, Hao Huan, PLLLCK signal of DRS4 
                      Reply  Wed Mar 3 14:37:40 2010, Stefan Ritt, PLLLCK signal of DRS4 
Message ID: 37     Entry time: Sat Feb 20 01:56:05 2010     Reply to this: 38
Author: Hao Huan 
Subject: PLLLCK signal of DRS4 

Hi Stefan,

    in the latest DRS4 datasheet I only saw your data of the DRS4 PLL locking time for 6GSPS sampling speed, with other rows "TBD". Have you tried those lower frequencies? According to the datasheet I think the PLLLCK should be stabily low when the PLL is locked; am I right? However when I try my design with the DRS4 chip and feed the reference clock signal at 0.5MHz or 2MHz, the PLLLCK I get can never stabilize. There could be some problem in the PCB circuit connection, but I want to confirm with you since I'm confused with those "TBD" blanks.

    Thanks a lot!

 

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