ADM487E:  5 V, 128 Nodes, ±15 kV ESD-Protected, 250kps Half-Duplex Transceiver

The ADM485E/ADM487E/ADM1487E are 5 V low power data transceivers with ±15 kV ESD protection suitable for halfduplex communication on multipoint bus transmission lines. They are designed for balanced ...More

ADM487E:  5 V, 128 Nodes, ±15 kV ESD-Protected, 250kps Half-Duplex Transceiver

Product Description

The ADM485E/ADM487E/ADM1487E are 5 V low power data transceivers with ±15 kV ESD protection suitable for halfduplex communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with TIA/EIA standards RS-485 and RS-422. The ADM487E and the ADM1487E have a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a bus, while the ADM485E allow up to 32 transceivers on a bus. Since only one driver is enabled at any time, the output of a disabled or powerdown driver is three-stated to avoid overloading the bus.

The driver outputs are slew rate-limited in order to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by bus contention or output shorting is prevented with a thermal shutdown circuit. The parts are fully specified over the industrial temperature ranges and are available in 8-lead SOIC packages

Applications

  • Energy/power metering
  • Lighting systems
  • Industrial control
  • Telecommunications
  • Security systems
  • Instrumentation

    • Features

    • TIA/EIA RS-485/RS-422 compliant
    • ESD protection on RS-485 I/O pins
    • ±15 kV human body model
    • Data rates: 250 kbps
    • Half-duplex options
    • Reduced slew rates for low EMI
    • −7 V to +12 V common-mode input range
    • Thermal shutdown and short-circuit protection
    • 8-lead SOIC packages

    Diagrams

    ADM487E Diagram
    Functional Block Diagram for ADM487E

    技术指标

    ESD-Protection 15 kV
    Pwr Supply (Vnom) +5
    Data Rate 250kbps
    Full-Half Duplex Half
    # of Nodes On Bus 128
    Drvr/Rcvr Enable Yes
    Fail Safe Open
    Isolation V (rms) ---
    Available Packages SOIC

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    订阅新产品资料
    Part# Min Pos Supply Pwr Supply (Vnom) Full-Half Duplex ESD-Protection Data Rate # of Nodes On Bus Drvr/Rcvr Enable Fail Safe Isolation V (rms) Available Packages Price* (1000-4999) Protocols
    ADM2482E +3 +3 to +5 & ISO +3 Full, Half 15 kV 16Mbps 256 Yes Open, Short 2.5 kV SOIC $4.66 RS-422, RS-485
    ADM2484E +3 +3 to +5 & ISO +3 Full, Half 15 kV 500kbps 256 Yes Open, Short 5 kV SOIC $3.04 RS-422, RS-485
    ADM2487E +3 +3 to +5 & ISO +3 Full, Half 15 kV 500kbps 256 Yes Open, Short 2.5 kV SOIC $3.64 RS-422, RS-485
    ADM2491E +3 +3 to +5 & ISO +5 Full, Half 8 kV 16Mbps 32 Yes Open 5 kV SOIC $4.76 RS-422, RS-485
    ADN4667 +3 3.3 --- 15 kV 400Mbps - Yes - - SOIC, SOP $1.16 RS-485/LVDS
    ADN4668 +3 3.3 --- 15 kV 400Mbps - Yes - - SOIC, SOP $1.15 RS-485/LVDS
    ADM2490E +2.7 +3 to +5 & ISO +5 Full 8 kV 16Mbps 32 No Open 5 kV SOIC $4.55 RS-422, RS-485
    ADM2483 +2.7 +3 to +5 & ISO +5 Half --- 500kbps 256 Yes Open, Short 2.5 kV SOIC $3.04 RS-485
    ADM2485 +2.7 +3 to +5 & ISO +5 Half --- 16Mbps 50 Yes Open 2.5 kV SOIC $5.57 RS-422, RS-485
    ADM2486 +2.7 +3 to +5 & ISO +5 Half --- 20Mbps 50 Yes Open 2.5 kV SOIC $5.04 RS-485
    ADM3070E +3 3.3 Full 15 kV 250kbps 256 Yes Open, Short --- SOIC $1.62 RS-422, RS-485
    ADM3071E +3 3.3 Full 15 kV 250kbps 256 No Open, Short --- SOIC $1.57 RS-422, RS-485
    ADM3488E +3 3.3 Full 15 kV 250kbps