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LM3881: Low Level Max Voltage

Mitchell
Expert 4915 points
Part Number: LM3881

Hi Team,

My customer wants to use LM3881 to drive a IC, which needs a voltage threshold of 0.2V. If the low level max voltage is 0.4V, this will not work for the design. Is itpossible to drive the LM3881 low level max voltage less than  0.2V by decreasing the Iflag (increasing the pull up resistor) as following?

-Mitchell

  • 0
    TI__Guru 58090 points

    Hi

    Datasheet has is what the production data, we can not guarantee anything outside of the data sheet.

    Regards

    Yihe  

  • 0 in reply to yihe
    TI__Expert 4915 points

    Thanks for your information. Actually they are not expecting anything beyond your datasheet spec.

    1. The table shows Vol max at 0.4V if Iflag=1.2mA for Vcc=3.3V
    2. Fig 7 shows Vol is about 0.25V if Iflag=1.2mA for Vcc=3.3V

    Both above cases are consistent in datasheet.

    My question is :

    If I decrease the Iflag=5V/100K=50uA with Vcc=5V, Fig 7 shows the Vol is close to 0V. Is this true or not?

    In another word instead of the above question:

    What is your table testing condition pull up resistor for Iflag=1.2mA at Vcc=3.3V?

  • 0 in reply to Mitchell
    TI__Guru 58090 points

    Hi

     If you consider the worst case Vol, the Rsdon is 0.4/1.2 = 333ohm while the typical is less.

    The large pull-up will help decrease the Vol voltage.

    But it is good that customers to test this on their own to see whether it meets their need.

    Regards

    Yihe