Home datasheet ADM3491ARZ


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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Manufacturer information


Analog Devices, Inc. Introduction - Analog Devices, Inc. (NASDAQ: ADI) defines innovation and excellence in signal processing. ADI's analog, mixed-signal, and digital signal processing (DSP) integrated circuits (IC) play a fundamental role in converting, conditioning, and processing real-world phenomena such as light, sound, temperature, motion, and pressure into electrical signals to be used in a wide array of electronic equipment. ADI is synonymous with high performance among electronics manufacturers and we collaborate with our customers to define the very best in the quality of the user experience. That means the clearest image, crispest sound, and optimum interface, size and performance in thousands of entertainment, medical, communications, industrial and other applications.

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