ADM2491E:  High Speed, ESD-Protected, Half-/Full-Duplex, iCoupler Isolated RS-485 Transceiver

The ADM2491E is an isolated data transceiver with ±8 kV ESD protection and is suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For halfduplex operation, ...More

ADM2491E:  High Speed, ESD-Protected, Half-/Full-Duplex, iCoupler Isolated RS-485 Transceiver

Product Description

The ADM2491E is an isolated data transceiver with ±8 kV ESD protection and is suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For halfduplex operation, the transmitter outputs and the receiver inputs share the same transmission line. Transmitter output Pin Y is linked externally to receiver input Pin A, and transmitter output Pin Z to receiver input Pin B. The ADM2491E is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E). The device employs Analog Devices, Inc., iCoupler ® technology to combine a 3-channel isolator, a threestate differential line driver, and a differential input receiver into a single package

The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM). The logic side of the device can be powered with either a 5 V or a 3.3 V supply, whereas the bus side requires an isolated 5 V supply. The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention could cause excessive power dissipation. The ADM2491E is available in a wide body, 16-lead SOIC package and operates over the −40°C to +85°C temperature range.

Features

  • Isolated, RS-485/RS-422 transceiver, configurable as half- or full-duplex
  • ±8 kV ESD protection on RS-485 input/output pins
  • 16 Mbps data rate
  • Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E)
  • Suitable for 5 V or 3.3 V operation (VDD1)
  • High common-mode transient immunity: >25 kV/@s
  • Receiver has open-circuit, fail-safe design
  • 32 nodes on the bus
  • Thermal shutdown protection
  • Safety and regulatory approvals pending
    UL recognition: 5000 V rms isolation voltage for 1 minute, per UL 1577
    VDE certificate of conformity
    DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
    Reinforced insulation, VIORM = 848 V peak

Diagrams

ADM2491E Diagram
Functional Block Diagram for ADM2491E

Specifications

Protocols RS-422,RS-485
Pwr Supply (Vnom) +3 to +5 & ISO +5
#Tx 2
# Rx 2
Data Rate 16Mbps
Low Power Shutdown No
Operating Temp Range -40 to +85

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