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ONET4251PA: Definition of VDIN+, VDIN-, VIN and VAST

F.N
Expert 8760 points
Part Number: ONET4251PA

Hi team,

My customer wants to know the definition of VDIN+, VDIN-, VIN and VAST.  

I think these as below.
Is this correct?  Please let me know.

Best regards,
Fumio Nakano

  • 0
    TI__Genius 13935 points

    Hello Nakano-san,

    Your drawing of VDIN+, VDIN- and VIN looks accurate.   The VAST is the voltage where the LOS indicator transitions to high indicating a loss of signal.  THe equation on page 3 shows how to program this voltage with an external resistor connected to the TH pin.  On page 8 there is a graph that shows the hystersis for when LOS goes back low again as the signal increases. The graph on page 8 also shows how changing the Rth resistor changes the LOS voltage.

    Regards,

    Loren

  • 0 in reply to Loren Siebert 1
    TI__Expert 8760 points

    Hello Siebert-san,

    Thank you for your quick reply. 
    Your reply was very helpul.
    Thank you!!

    Best regards,
    Fumio Nakano