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Original question:

DS90LV049H: DS90LV049HMTX/NOPB

DS90LV049H: DS90LV049HMTX/NOPB

Yazharasan m
Prodigy 45 points
Part Number: DS90LV049H

Tool/software:

Hi ,

Could you confirm the formula and value of Common-Mode Voltage Range of this part. 

 VCMR=        i use this formula, with condition VID = 100 mV, VDD=3.3 V. The answer i got is 0.05 to 3.25V.

But in datasheet the value is 0.05 to 3V, with same condition

Could you please confirm the formula and correct value!

  • 0
    TI__Genius 15321 points

    Hello,

    Could you please share the page number in the datasheet where the formula reference above is located? I am having trouble finding it.

    Thank you,

    Amy

  • 0 in reply to Amy
    Prodigy 45 points

    Hi,

    I got those formula from our existing part's datasheet (FIN1049MTCX_Onsemi). Thats why I'm asking the formula from your side.

    Regards,

    Yazh

  • 0
    Guru 317370 points

    Both datasheets define the common-mode voltage as the average of the two input voltages, but for the input voltage specification, using it just obscures the absolute limits.

    The FIN1049 allows voltages between GND and VCC at each LVDS input pin.
    The DS90LV049H allows voltages between GND and 3.05 V at each LVDS input pin.

  • 0 in reply to Yazharasan m
    TI__Genius 15321 points

    Hello,

    We do not have an equivalent formula for this device. The Vcm range is as stated in the datasheet ranging from 0.05V to 3V.

    The common mode input must fall within this range to guarantee datasheet parameters.

    Thank you,

    Amy