ADM2486:  iCoupler® High Speed Isolated RS-485 Tranceiver

The ADM24861 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on multipoint bus transmission lines. It is designed for ...More

ADM2486:  iCoupler® High Speed Isolated RS-485 Tranceiver

Product Description

The ADM24861 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A and ISO 8482:1987(E).

The device employs Analog Devices’ iCoupler technology to combine a 3-channel isolator, a 3-state differential line driver, and a differential input receiver into a single package. The logic side of the device can be powered with either a 5 V or a 3 V supply while the bus side is powered with a 5 V supply.

The ADM2486 driver has an active high enable. The driver differential outputs and the receiver differential inputs are connected internally to form a differential input/output port that imposes minimal loading on the bus when the driver is disabled or when VDD1 or VDD2 =0. Also provided is an active high receiver disable that causes the receive output to enter a high impedance state.

The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention might cause excessive power dissapation.

Features

  • High-Speed Isolated RS-485 Transceiver
  • Electrical Data Isolation 2500 VRMS for 1 min (UL 1577 Certification)
  • PROFIBUS Compliant
  • Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482:1987(E)
  • High Data Rate: 20 Mbaud (NRZ)
  • Low Power Operation:
    DC–5 MBd: 5.7 mA max
    12 MBd: 8.5 mA max
    20 MBd: 10 mA max
  • Suitable for 5 V or 3 V Operation (VDD1)
  • High Common Mode Transient Immunity: >25 KV/µs

Diagrams

ADM2486 Diagram
Functional Block Diagram for ADM2486

Specifications

Protocols RS-485
Pwr Supply (Vnom) +3 to +5 & ISO +5
#Tx 1
# Rx 1
Data Rate 20Mbps
Low Power Shutdown No
Operating Temp Range -40 to +85

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