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About max cable rangh of DS90LV019

Satoshi
Guru 19645 points
Other Parts Discussed in Thread: DS90LV019

Please let me know about max cable range of DS90LV019.

・Cable：CAT5

・Signaling rate：100Mbps

 

Best regards,

Satoshi

  • 0
    Guru 19645 points
    Any update on this?
  • 0 in reply to Satoshi
    TI__Mastermind 43795 points

    Hi,

    There are many factors which can influence the maximum cable length.  When a device does not have signal conditioning I tend to limit the maximum cable loss to about -3 dB.  Based on CAT5 specifications, the cable loss at 50 MHz (nyquist frequency for 100 Mbps) is approximately 0.16 dB/meter.  This value would allow almost 20 meters of cable to be driven at 100mbps datarate. 

    LVDS has a limited common mode voltage range.  So long cable runs can run into trouble with GND potential.  Ethernet uses magnetics to overcome this problem.  If LVDS is going to drive an external cable, I would recommend using some data encoding or scrambling so that AC coupling can be used to isolate the Rx and Tx devices.