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CDCLVP1102: Differential Input Voltage Specification

Gary Stein
Prodigy 30 points
Part Number: CDCLVP1102
Other Parts Discussed in Thread: LMK1D1208

Tool/software:

The CDCLVP1102 datasheet lists maximum Differential input peak-peak voltage as 1.5V.   Figure 14 shows a DC-coupled LVCMOS as an input to INP, with INN biased to 1/2 of the LVCMOS swing.  With 1.8V LVCMOS, this would result in a differential input peak-peak voltage of 1.8V {2*(Vinp - Vinn)}.   Is the application therefore only suited for 1.5V or below LVCMOS?  (Also note at VCC=1.5V+5% the max will be exceeded).  Or is the max input voltage of 1.5V incorrect?

Note the CDCLPV1102 datasheet does not explicitly define "differential peak-peak voltage", in contrast to the LMK1D1208 datasheet where diff peak to peak is clearly 2*(Vinp - Vinn).

  • +1
    TI__Genius 10220 points

    Hi Gary, 

    We have a separate spec for LVCMOS inputs for CDCLVCP1102, see table 6.5 in the datasheet: 

    Most likely the 1.5 Vpp max spec for differential inputs is not a hard limit that will damage the device, but it's a characterization limit for where we can guarantee the output performance. Let me know if you have any other questions. 

    Regards, 

    Connor