• ADM1485 input open

    Hi

    I have a question about table II of ADM1485 Datasheet.

    Does RO go to 1 independent of DE level when RE=0 and A,B are open?

    Best regards

    N.Kokubo

  • ADM1485, fail-safe feature

    Hi,

    ADM1485 datasheet p.3 Table II specify when differential input A-B is <Inputs Open>, RO output becomes to logic High.

    Here, are you talking Inputs Open by defining A-B actual differential voltage is from -0.2V to 0.2V, isn't it ?

    By another…

  • ADM1485 fail-safe feature

    Hi,

    According to the ADM1485 datasheet page 9/12 Reciever Open-Circuit Fail-Safe section, this product guarantees a logic high on the reciever. How does it guarantee a logic high?  I suppose that it can not guarantee it from its differential input threshold…

  • About the ADM1485 "Differential Input Threshold Voltage"

    Hello,

    About the ADM1485,

    Does "Differential Input Threshold Voltage" change due to fluctuation of Vcc?

    In the board suspected of fluctuation of Vcc, a plurality of points switching
    from High to Low was confirmed.(For example, +3mV, +12mV, …

  • ADM1485 bus open circuit failure detection with termination

    Hi All,

     

    My customer is using ADM1485 for his equipment.

    One pair of ADM1485 are controlled by one CPU, it means both of DE and /RE are controlled by one CPU, and the data is sent and received between two ADM1485s.

    It also needs the bus open failure…

  • RE: 时钟信号长距离传输应用

    长距离传输RS485,芯片ADM1485/86,速率是30Mbps,这样算下来时钟为15Mhz,不能满足传输25Mhz时钟需求

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