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Urgent: LMH7322 output to LVDS receiver

Nat Wong
Genius 3070 points
Other Parts Discussed in Thread: LMH7322

Dear Sirs

LMH7322 output to LVDS receiver

Signal input from A0 & A1, compare to Vr.

Reference circuit from LMH7322 data sheet Fig.24

But change the Vcci from 5V to 3.3V, Vcco from 2.5V to 3.3V.

Is the schematic ok?

 

BRS

Nat

  • 0
    TI__Genius 13935 points

    Hi Nat,

    I don't normally work with comparators.  I think this would be better posted in the General Purpose Amplifiers & Other Linear section. The High Speed Interface forum also covers LVDS devices. 

    I will give you my best answer, though.  On page 2 of the datasheet is shows a supply voltage range of 2.7V to 12V (Vccx - Vee), so your supply voltage levels are fine as far as device operation is concerned. 

    If you look at Figure 24 it shows +5V for Vcci (comparator supply) and 2.5V for the Vcco (output reference) and then a -5V Vee. 

    If you change Vcco to 3.3V your output levels will now be 2.2V and 1.8V.  This is not LVDS compliant anymore.  So I think this will not be a good idea. 

    The other thing I noticed is that your A1 will be opposite polairty to your A0.  Was this intentional?

    Regards,

    Loren