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LMK03806 LVCMOS Output

Other Parts Discussed in Thread: LMK03806

Hi,

Please look at the highlighted area for the LMK03806 datasheet, it is about Tskew. It says in the “condition” column that R load is 50 ohm. My question is: How come LVCMOS can be loaded with 50 ohm? LVCMOS as far as I know is intended for high impedance load.

Thanks.

  • I believe output skew was specified this way for convenient and accurate testing using a high-bandwidth GHz o-scope with 50-ohm input through 50-ohm phase-matched coax cables .  The 50-ohm scope input provides proper load termination to minimize reflections from impacting these precise measurements.  Measurement system complexity and errors could be introduced when using high-impedance probes.

    Regards,
    Alan

  • It is also possible to AC couple the CMOS output to the 50 ohm Oscope load to prevent DC loading on CMOS output buffer.

    73,

    Timothy