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Valpey's attenuators set ultralow jitter performance

Posted: 03 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Ethernet? attenuators Valpey? network?

Valpey Fisher Corp. has introduced two jitter attenuators for synchronous Ethernet applications. The VFJA910 jitter attenuator provides two LVCMOS outputs with a frequency of 25MHz, while the VFJA911 device provides a LVPECL output with a frequency of 25MHz.

With less than 0.4dBc of jitter peaking both the VFJA910 and VFJA911 allow for cascading multiple stages within the network. A select input allows the user to switch from the external input reference to a free-run mode. In free-run mode, the devices output a 25MHz clock that is not locked to the input reference frequency.

Operating with a +3.3 volt power supply, the VFJA910 typically consumes 120mW while the VFJA911 uses 135mW. Both devices offer an ultralow jitter of 0.25ps RMS. Phase noise is recorded 140dBc/Hz at 1KHz for the VFJA910 and 138dBc/Hz at 1KHz for the VFJA911. The devices are available in a 15.0mm x 13.0mm surface-mount package.

Gina Roos

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