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LMX2820: OSCin input voltage in differential mode

franziskus
Expert 8379 points
Part Number: LMX2820

Team,

my customer wants to use the OSCIN_P/N input and supply it differential.
The datasheet leaves some questions for them, especially the marked value:

Is the voltage related to one pin when used differential?
Why is the voltage so much higher when used single-ended?
Are this peak-to-peak voltages or amplitude voltages (or even DC range)?

In general, what information can they draw from this voltage information?

Thanks for your help!

  • 0
    TI__Guru** 108750 points

    Hi Franziskus,

    The 0.1V to 1V input voltage is referring to either the _P or _N pin. The output of OSCin buffer is therefore 0.2 to 2Vpp. 

    However, when only one input pin is used (_N pin is ac-coupled to ground), the _P pin can tolerate a higher voltage making it possible with CMOS clock.