ADUM2251:  Hot-Swappable Dual I2C® Isolators, 5 kV

The ADuM2250/ADuM2251* are hot swappable digital isolators with nonlatching bidirectional communication channels and are compatible with I2C interfaces. This eliminates the need ...More

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Technical Article: IEC 60601-1-Compliant Digital Isolators with iCoupler Technology

ADUM2251:  Hot-Swappable Dual I2C® Isolators, 5 kV

Product Description

The ADuM2250/ADuM2251* are hot swappable digital isolators with nonlatching bidirectional communication channels and are compatible with I2C interfaces. This eliminates the need for splitting I2C signals into separate transmit and receive signals for use with stand-alone optocouplers.

The ADuM2250 provides two bidirectional channels supporting a complete isolated I2C interface. The ADuM2251 provides one bidirectional channel and one unidirectional channel for those applications where a bidirectional clock is not required.

The ADuM2250/ADuM2251 contain hot swap circuitry to prevent data glitches when an unpowered card is inserted onto an active bus.

These isolators are based on iCoupler® chip-scale transformer technology from Analog Devices, Inc. iCoupler is a magnetic isolation technology with functional, performance, size, and power consumption advantages compared to optocouplers. The ADuM2250/ADuM2251 integrate iCoupler channels with semiconductor circuitry to enable a complete, isolated I2C interface provided in a small form-factor.

* Protected by U.S. Patents 5,952,849; 6,873,065 and 7,075,329; other patents pending


Applications

  • Isolated I2C, SMbus, or PMBus Interfaces
  • Multilevel I2C interfaces
  • Power supplies
  • Networking
  • Power-over-Ethernet

Features

  • Bidirectional I2C communication
  • Open-drain interfaces
  • Suitable for hot swap applications
  • 30 mA current sink capability
  • 1000 KHz operation
  • 3.0 V to 5.5 V supply/logic levels
  • Wide body SOIC 16-lead package with > 8 mm creepage
  • High temperature operation: 105°C
  • Safety and regulatory approvals
  • UL recognition (pending)
  • 5000 V rms for 1 minute per UL 1577
  • CSA component acceptance notice #5A

Diagrams

ADUM2251 Diagram
Functional Block Diagram for ADUM2251

Specifications

Max Operating Temp (°C) 105Deg
Insulation Rating (kVrms) 5kV rms
Serial Clock Unidirectional
# Ch 2
Output Default State High

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Part# Features # Ch Max Data Rate(Mbps) Resolution (Bits) Insulation Rating (kVrms) Isolation Voltage (Vrms) Max Operating Temp (°C) Pulse Width Distort (ns) Max Prop Delay (ns) Pos Supply Min Output Voltage (V) Max Output Voltage (V) Output Default State Serial Clock Package Output Power (mW) iCouplerType Price* (1000-4999)
AD7400 Isolated Sigma-Delta Modulator - 10 16 - - - - - +4.5V to +5.5V - - - - 16-Lead SOIC - - $4.05
AD7401 Isolated Sigma-Delta Modulator - 10 16 - - - - - +4.5V to +5.5V - - - - 16-Lead SOIC - - $4.05
ADM2483 RS-485 Transceiver/Half Duplex 1 0.5 - 2.5 - 85 - - +2.7V to +5.5V 1.5 5 Z - 16-Lead SOIC - - $3.04
ADM2485 RS-485 Transeiver 1 16 - 2.5 - 85 - - +2.7V to +5.5V 2.1 5 Z - 16-Lead SOIC - - $5.57
ADM2486 RS-485 Transceiver/Half Duplex w/ Transformer Driver 1 20 - 2.5 - 85 - - +2.7V to +5.5V - - Z - 16-Lead SOIC - - $5.04
ADM2490E RS-485 Transceiver/Full Duplex 1 16 - 5 - 105 - - +2.7V to +5.5V - - High - 16-Lead SOIC - - $4.55
ADUM1100 Standard Digital Isolator 1 100 - 2.5 2.5 125 2 18 +3V to +5.5V 3 5.5 High - 8-Lead SOIC - Standard $1.63
ADUM1200 Standard Digital Isolator 2 25 - 2.5 2500