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3.3 V Slew Rate Limited, Half- and Full-Duplex, RS-485/RS-422 Transceivers


The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are low power, differential line transceivers designed to operate using a single 3.3 V power supply. Low power consumption, coupled with a shutdown mode, makes the ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 ideal for power-sensitive applications. The ADM3488/ADM3490/ADM3491 feature full-duplex communication, while the ADM3483/ADM3485 are designed for half-duplex communication.
The ADM3483/ADM3488 feature slew rate limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250 kbps.
The ADM3485/ADM3490/ADM3491 transmit at up to 10 Mbps. The receiver input impedance is 12 kΩ, allowing up to 32 transceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. If a significant temperature increase is detected in the internal driver circuitry during fault conditions, then the thermal shutdown circuit forces the driver output into a high impedance state. If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state. The parts are fully specified over the commercial and industrial temperature ranges. The ADM3483/ADM3485/ADM3488/ADM3490 are available in 8-lead SOIC_N; the ADM3491 is available in a 14-lead SOIC_N.

  Operate with 3.3 V supply
  Interoperable with 5 V logic
  EIA RS-422 and RS-485 compliant over full common-mode range
  Data rate options
     ADM3483/ADM3488: 250 kbps
     ADM3485/ADM3490/ADM3491: 10 Mbps
  Half- and full-duplex options
  Reduced slew rates for low EMI (ADM3483 and ADM3488)
  2 nA supply current in shutdown mode (ADM3483/ADM3485/ADM3491)
  Up to 32 transceivers on the bus
  −7 V to +12 V bus common-mode range
  Specified over the –40°C to +85°C temperature range
  8 ns skew (ADM3485/ADM3490/ADM3491)
  8-lead SOIC and 14-lead SOIC (ADM3491 only) packages
  Low power RS-485/RS-422 applications
  Industrial process control


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