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DS92LV0411: Cable/connector with suitable impendance?

Lo2
Expert 1925 points
Part Number: DS92LV0411
Other Parts Discussed in Thread: DS92LV0412,

Hi,

We would like to extend an LVDS signal over a length of up to 5m using a cots cable and connectors.

According to the spec, the USB-C high speed pair of a USB-C cable has an impedance of 90 ohms.

Would that be an appropriate match for the recommended 100 ohms?

We'd use  a set of DS92LV0411 / DS92LV0412  on one high speed pair of the cable.

Best regards,

Lo2

  • 0
    Expert 1925 points

    Addendum, USB-C cable:

    3.7.1 Raw Cable (Informative)
    Informative raw cable electrical performance targets are provided to help cable assembly
    manufacturers manage the procurement of raw cable. These targets are not part of the USB
    Type-C compliance requirements. The normative requirement is that the cable assembly
    meets the performance characteristics specified in Sections 3.7.2 and 3.7.5.3.
    The differential characteristic impedance for shielded differential pairs is recommended to
    be 90 Ω ± 5 Ω. The single-ended characteristic impedance of coaxial wires is recommended
    to be 45 Ω ± 3 Ω. The impedance should be evaluated using a 200 ps (10%-90%) rise time; a
    faster rise time is not necessary for raw cable since it will make ca ble test fixture
    discontinuities more prominent.

  • 0 in reply to Lo2
    TI__Genius 12866 points

    Hi,

    For LVDS, the cable impedance requirement is 100ohm +/- 10.

    The USB cable may fall below the limit if it goes below 90ohm

    Best Regards,

    Charley Cai