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LMK61E2-125M: Connecting to cdclvp1102rgtt

Anthony Monti
Intellectual 330 points
Part Number: LMK61E2-125M
Other Parts Discussed in Thread: CDCLVP1102, LMK61E2

Per the OSC data sheet, the LVPECL Vout, Diff PP is 2xVod = 2x1200mv max= 2.4Vpp. The input of the buffer CDCLVP1102rgtt LVPECL is Vin Diff pp 1.5V max, per it's data sheet. I was planning to connect the two per Figure 19 of the CDCLVP1102 data sheet.

Per the data sheet the OSC output exceeds the input of the Buffer. Am I reading this wrong? It would be odd that both devices being LVPECL can not be connected. How should I connect the two devices? Thank you, Tony

  • 0
    TI__Genius 16845 points
    Hi Tony,

    I recommend to add series resistors (Rs) near the LMK61E2 driver outputs to form a voltage divider with the load termination (50 ohm/side). Place the Rs on the driver side after the 150-ohm LVPECL biasing resistor.

    Vid = Vod*50/(Rs+50) (single ended swing)


    Kind regards,
    Lane