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TLK6201EA: Output Swing

Mark Heh
Intellectual 270 points
Part Number: TLK6201EA

The datasheet of the TLK6201EA specifies the Vod, Differential data output voltage swing as 800 mVp-p.

Is this for one leg of the output (either Dout+ or Dout-) and since it is given in peak to peak amplitude this is the N subtracted from the P trace of one leg?

OR

Is this for the voltage of DOUT- subtracted from DOUT+?

Also, I'm looking to interface with a standard 1.8V LVDS receiver (Virtex 7). Will I be able to directly drive to a standard LVDS receiver if I ac couple this output?

  • 0
    TI__Mastermind 43795 points

    Hi Mark,

    The 800mVpp is the differential output amplitude (peak to peak).  If uses the equation [(DOUT+) - (DOUT-)].

    For LVDS devices the common mode is set by the Tx output to be ~ 1.2V.  With the AC coupled TLK6201EA output there will be no common mode voltage reference after the capacitor coupling.  You would need to add in an appropriate common mode reference voltage externally using a resistor divider.  Or maybe there is a capability within the FPGA to do something similar which can ensure the common mode is compatible with the Virtex 7 input differential pair.

    Regards,

    Lee