ADM2481

PRODUCTION

2.5 kV Signal Isolated, 500 kbps, Half Duplex RS-485 Transceiver

Data Sheet (Rev. D) Product Selection Table
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Overview

  • RS-485 transceiver with electrical data isolation
  • Complies with ANSI TIA/EIA-485-A and ISO 8482:1987(E)
  • 500 kbps data rate
  • Slew rate-limited driver outputs
  • Low power operation: 2.5 mA maximum
  • Suitable for 5 V or 3.3 V operations (VDD1)
  • High common-mode transient immunity: >25 kV/μs
  • True fail-safe receiver inputs
  • Chatter-free power-up/power-down protection
  • 256 nodes on bus
  • Thermal shutdown protection
  • Safety and regulatory approvals
    • DIN EN IEC 60747-17 (VDE 0884-17)
      • VIORM = 656 V peak
    • UL 1577
      • VISO = 2500 V rms for 1 minute
    • IEC/EN/CSA 62368-1 (pending)
    • IEC/CSA 60601-1 (pending)
    • IEC/CSA 61010-1 (pending)
  • Operating temperature range: −40°C to +85°C

The ADM2481 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on balanced, multipoint bus transmission lines. It complies with ANSI EIA/TIA-485-A and ISO 8482: 1987(E). Using iCoupler® technology from Analog Devices, Inc., the ADM2481 combines a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. The logic side of the device is powered with either a 5 V or 3 V supply, and the bus side uses a 5 V supply only.

The ADM2481 is slew-limited to reduce reflections with improperly terminated transmission lines. The controlled slew rate limits the data rate to 500 kbps. The input impedance of the device is 96 kΩ, allowing up to 256 transceivers on the bus. Its driver has an active-high enable feature. The driver differential outputs and receiver differential inputs are connected internally to form a differential I/O port. When the driver is disabled or when VDD1 or VDD2 = 0 V, this imposes minimal loading on the bus. An active-high receiver disable feature, which causes the receiver output to enter a high impedance state, is provided as well.

The receiver inputs have a true fail-safe feature that ensures a logic-high receiver output level when the inputs are open or shorted. This guarantees that the receiver outputs are in a known state before communication begins and at the point when communication ends.

Current limiting and thermal shutdown features protect against output short circuits and bus contention situations that might cause excessive power dissipation. The part is fully specified over the industrial temperature range of −40°C to +85°C and is available in a 16-lead, wide body SOIC package.

Applications

  • Low power RS-485/RS-422 networks
  • Isolated interfaces
  • Building control networks
  • Multipoint data transmission systems
ADM2481
2.5 kV Signal Isolated, 500 kbps, Half Duplex RS-485 Transceiver
ADM2481 Functional Block Diagram ADM2481 Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Application Note 3

Safety and Regulatory Compliance 1

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Hardware Ecosystem

Parts Product Life Cycle Description
ADM2461E
RECOMMENDED FOR NEW DESIGNS 500 kbps, 5.7 kV RMS, Signal Isolated Half Duplex RS-485 Transceiver with ±15 kV IEC ESD
ADM2761E
RECOMMENDED FOR NEW DESIGNS 5.7 kV RMS Isolated, High Working Voltage, RS-485 Transceiver with ±15 kV IEC ESD
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Evaluation Kits
EVAL-ADM2481
ADM2481 Evaluation Board

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