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ADM2481BRWZ

2.5kV isolated 500kbps half-duplex RS-485, iCoupler, 256 nodes, SOIC-16W, fail-safe

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Manufacturer Part：

ADM2481BRWZ

Package：

SOIC-16 Wide (10.50 x 7.60 x 2.35 mm)

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Description

Product Overview

The ADM2481BRWZ from Analog Devices is a 2.5kV signal-isolated, 500kbps, half-duplex RS-485 transceiver in a 16-lead wide-body SOIC package. Using iCoupler technology, it integrates a 3-channel isolator with an RS-485 driver and receiver for galvanically isolated communication.

Key Specifications

Data Rate 500 kbps (slew-rate limited)
Isolation Voltage 2500 Vrms (UL 1577)
Common-Mode Transient Immunity >25 kV/µs
Bus Nodes Up to 256
Supply Voltage (Logic Side) 3.0 V to 5.5 V (VDD1)
Supply Voltage (Bus Side) 4.75 V to 5.25 V (VDD2)
Supply Current 2.5 mA max
Receiver Fail-Safe True fail-safe (open/shorted inputs)
Protection Thermal shutdown, current limit
Operating Temperature -40°C to +85°C
Package 16-lead SOIC Wide (7.50mm)

Features

  • 2.5kV galvanic isolation using iCoupler technology for RS-485 communication
  • 500kbps slew-rate-limited data rate for EMI reduction on long cables
  • Supports up to 256 nodes on bus with 96kΩ input impedance
  • True fail-safe receiver ensures known state when inputs are open or shorted
  • Chatter-free power-up and power-down protection
  • 3.3V or 5V logic side operation with 5V bus side supply

Applications

  • Isolated RS-485/RS-422 communication in industrial automation
  • Building control networks with ground loop isolation
  • Multipoint data transmission systems requiring galvanic isolation

The ADM2481BRWZ from Analog Devices is an integrated, galvanically isolated half-duplex RS-485 transceiver designed for bidirectional data communication on balanced, multipoint bus transmission lines. The device uses Analog Devices proprietary iCoupler technology to combine a 3-channel digital isolator, a three-state differential line driver, and a differential input receiver into a single 16-lead wide-body SOIC package. The logic side operates from either a 3V or 5V supply (VDD1), while the bus side requires a 5V supply (VDD2). The device is slew-rate limited to 500kbps, reducing reflections on improperly terminated transmission lines. The 96kOhm receiver input impedance allows up to 256 transceivers on a single bus. True fail-safe receiver inputs ensure a logic-high output when the bus is open or shorted.

The ADM2481BRWZ integrates a digital isolator, RS-485 driver, and RS-485 receiver. The iCoupler isolation uses transformer-based technology to transfer data across the galvanic barrier with 2500Vrms isolation and >25kV/us common-mode transient immunity. When DE is high, the driver amplifies TxD and drives differential signals onto the A and B bus lines with slew-rate limiting for EMI reduction. When RE is low, the receiver compares the voltage difference between A and B with true fail-safe threshold ensuring high output when inputs are open or shorted. VDD1 powers the logic side and VDD2 powers the bus side, with the isolation barrier preventing ground loops.

Pin Name Function
1 VDD1 Logic side supply (3-5.5V)
2,7,8 GND1 Logic side ground
3 RxD Receiver data output
4 RE Receiver enable (active low)
5 DE Driver enable (active high)
6 TxD Transmit data input
9,10,15 GND2 Bus side ground
12 A Non-inverting bus I/O
13 B Inverting bus I/O
16 VDD2 Bus side supply (5V)
  • Isolated RS-485 communication in industrial automation with ground loop prevention
  • Building control network data transmission with 2.5kV galvanic isolation
  • Multipoint bus systems requiring up to 256 nodes and fail-safe operation
Manufacturer Part Number Package Notes
ADI ADM2587EBRWZ SOIC-20W Isolated, 500kbps, integrated DC/DC
TI ISO3086DW SOIC-16W Isolated RS-485, 500kbps
ADI ADM2483EBRWZ SOIC-16W Isolated, 500kbps, 3.3V bus
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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