ADM2487E

PRODUCTION

2.5 kV Signal Isolated, ESD Protected, Full/Half Duplex RS-485 Transceiver w/ Transformer Driver (500 kbps)

Data Sheet (Rev. B) Product Selection Table
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Overview

  • Isolated RS-485/RS-422 transceiver, configurable as half or full duplex
  • Integrated oscillator driver for external transformer
  • ±15 kV ESD protection on RS485 input/output pins
  • Complies with TIA/EIA-485-A-98 and ISO 8482:1987(E)
  • Data rate: 500 kbps
  • 5 V or 3.3 V operation (VDD1)
  • 256 nodes on bus
  • True fail-safe receiver inputs
  • Safety and regulatory approvals
    • UL recognition: 2500 V rms for 1 minute per UL 1577
    • VDE certificates of conformity
      • DIN VVDE V 0884-10 (VDE V 0884-10):2006-12
      • VIORM = 560 V peak
  • Thermal shutdown protection
  • Operating temperature range: −40°C to +85°C
  • Wide-body, 16-lead SOIC package

The ADM2482E/ADM2487E are isolated data transceivers with ±15 kV ESD protection and are suitable for high speed, half-duplex or full-duplex communication on multipoint transmission lines. For half-duplex operation, the transmitter outputs and 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 parts are designed for balanced transmission lines and comply with TIA/EIA- 485-A-98 and ISO 8482:1987(E).

The devices employ the Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. An on-chip oscillator outputs a pair of square waveforms that drive an external transformer to provide isolated power. The logic side of the device can be powered with either a 5 V or a 3.3 V supply, and the bus side is powered with an isolated 3.3 V supply.

The ADM2482E/ADM2487E driver has an active high enable, and the receiver has an active low enable. The driver output enters a high impedance state when the driver enable signal is low. The receiver output enters a high impedance state when the receiver enable signal is high.

The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention 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

  • Isolated RS-485/RS-422 interfaces
  • Industrial field networks
  • Multipoint data transmission systems
ADM2487E
2.5 kV Signal Isolated, ESD Protected, Full/Half Duplex RS-485 Transceiver w/ Transformer Driver (500 kbps)
ADM2482E/ADM2487E Functional Block Diagram ADM2482E/ADM2487E Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Application Note 3

Technical Articles 2

Safety and Regulatory Compliance 1

Frequently Asked Question 1

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Evaluation Kits

EVAL-ADM2487E

ADM2487E Evaluation Board

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Features and Benefits

  • Easy evaluation of the ADM2482E/ADM2487E
  • Isolated ground plane layout
  • Configurable as full duplex or half duplex
  • Evaluation of the ADM2482E at 16 Mbps
  • Evaluation of the ADM2487E at 500 kbps

Product Details

The ADM2487E evaluation board allow the ADM2482E/ADM2487E isolated RS-485 transceivers to be quickly and easily evaluated. The evaluation board allows all of the input and output functions to be exercised without the need for external components.


The ADM2487E feature an integrated transformer driver that outputs a pair of square waves to an external transformer to provide isolated power. When the ADM2487E is powered by 3.3 V on the logic side (VDD1), a transformer, U3, is required with a turns ratio of 1:1.5 (DA2303-AL). This ensures that there is enough headroom for the ADP3330 LDO to output a regulated 3.3 V output (EVAL-ADM2482EEB3Z and EVAL-ADM2487EEB3Z). 


When the ADM2487E is powered by 5 V on the logic side, a transformer, U3, is required with a turns ratio of 1:1 (GA3157-AL) to give a 5 V input for the ADP3330, which regulates an output of 3.3 V output (EVAL-ADM2482EEB5Z and EVAL-ADM2487EEB5Z).
EVAL-ADM2487E
ADM2487E Evaluation Board

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