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Analog Devices Inc. logo Results on Analog.com
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    1. ADM1487E
      Production
      Product
      RS-485 and RS-422
      5 V, ±15 kV ESD Protected, Half Duplex RS-485/RS-422 Transceiver (2.5 Mbps, ¼ Load)
      ADM1487E

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      Sample & Buy

    2. ADM485E/ADM487E/ADM1487E: 5 V, 15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers Data Sheet
      Data Sheet

      PDF

      ADM485E/ADM487E/ADM1487E: 5 V, 15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers Data Sheet

      757 kB

    3. ADM487E
      Production
      Product
      RS-485 and RS-422
      5 V, ±15 kV ESD Protected, Half Duplex RS-485/RS-422 Transceiver (250 kbps, ¼ Load)
      ADM487E

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    4. ADM3485E
      Production
      Product
      RS-485 and RS-422
      3.3 V, ±15 kV ESD-Protected, RS-485/RS-422 Transceiver (Half Duplex, 12Mbps, DE/RE)
      ADM3485E

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    5. ADM1486
      Production
      Product
      RS-485 and RS-422
      5 V, High Speed (30 Mbps), Low Power, Half Duplex RS-485 PROFIBUS Transceiver
      ADM1486

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    6. ADM1485
      Production
      Product
      RS-485 and RS-422
      5 V, High Speed (30 Mbps), Low Power, Half Duplex EIA RS-485 Transceiver
      ADM1485

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    7. ADM485E
      Production
      Product
      RS-485 and RS-422
      5 V, ±15 kV ESD Protected, Half Duplex RS-485/RS-422 Transceiver (2.5 Mbps)
      ADM485E

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    8. ADM3486E
      Production
      Product
      RS-485 and RS-422
      3.3 V, ±15 kV ESD-Protected, RS-485/RS-422 Transceiver (Half Duplex, 2.5 Mbps, DE/RE)
      ADM3486E

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    9. ADM483E
      Production
      Product
      RS-485 and RS-422
      5 V, ±15 kV ESD Protected, Slew Rate Limited, Low Power, Half Duplex RS-485/RS-422 Transceiver
      ADM483E

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    10. ADM3488E
      Production
      Product
      RS-485 and RS-422
      3.3 V, ±15 kV ESD-Protected, RS-485/RS-422 Transceiver (Full Duplex, 250kbps)
      ADM3488E

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      1. Fail safe feature of ADM3485EARZ

        Forum Thread
        Answered
        Interface and Isolation
        24 June, 2019
        Hi We would like to confirm the Fail safe feature of ADM3485EARZ. and have two questions as below 1 In the data sheet of ADM34858EARZ, it is with fail-safe feature. But it do not present the voltage range of fail-safe. We see AN-960(Implementation Guide) shows …

      2. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        07 July, 2019
        Hi Wallace, The Diode has large current rating which would be over design( the DC bias current is at several mA level) and you need take the diode voltage drops into consideration when calculating the resistors value, the bias resistors can limit the max. current well. If the front stage …

      3. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        03 July, 2019
        Hi Neil We have two question as below 1. In original design, Pull high resistor is connected to VDD33(Main chip power) We plan change to connect with 5V and series a DIODE(100V 200mA). The purpose of DIODE is to block the DC current form the pull high …

      4. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        28 June, 2019
        Hi Wallace, I suggest you to check the system 3.3V current output capability, and add some inductors on SOC chip supply net to improve the noise immunity, also large bypass capacitors may be needed. Regards, Neil

      5. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        28 June, 2019
        Hi Neil We do not have good bypass on power supply. We use system 3.3V to pull high/low resistor of RS-485 A, B line However when DUT connect with 3 RS-485 device. Their pull high voltage will go through the system 3.3 V net …

      6. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        27 June, 2019
        Hi Wallance, The 39mV is not enough, and 900Ohm is recommended, would the 900 Ohm cause boot up problem? Do you have good bypass on power supply? Regards, Neil

      7. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        27 June, 2019
        Hi Neil Due to 330 ohm cause one system boot up issue. We need to change 330 ohm to 5K ohm. If we change 330 ohm to 5K, A-B is +39mV. When Bus idle and A-B = 39mV, Can RO hold out 3.3V ?

      8. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        27 June, 2019
        Hi Wallace, The 330 Ohm resistors should be OK except drawing extra currents from bias supply or transceiver. Regards, Neil

      9. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        27 June, 2019
        Hi Neil Got it Thanks! We will add bias-resistor for open fail-safe feature. The Board use two ADM3485E chip, we add 330 ohm bias-resistor as below two figures. Fig.1 is with Terminal resistor. Fig.2 is without Terminal resistor. Could you help to confirm if …

      10. RE: Fail safe feature of ADM3485EARZ

        Forum Reply
        Interface and Isolation
        24 June, 2019
        Hi Wallance, For question 1: The differential input threshold voltage is -200mV to 200mV, and ADM3485E only has open fail-safe feature rather than true fail safe. question 2: It does not have true fail-safe so the bias resistor is needed. Regards, Neil

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