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First bidirectional isolator bus chip cuts board requirements by 80 percent

Norwood, Mass.&#8212Analog Devices says its ADuM125x family is the first to provide true bidirectional isolation for the I2 C bus in industrial, networking and power supply applications. The digital isolators reportedly save as much as 80 percent in board space over traditional optocoupler solutions.

Based on the company's iCoupler chip-scale
micro-transformer technology, the ADuM1250 and ADuM1251 devices provide 2.5 kV of isolation across bidirectional I2 C lines in a single, narrow-body 8-lead SOIC package. This solution eliminates the need for additional circuitry to split bus data into separate transmit and receive signals and for stand alone optocouplers to isolate the signals. Both members of the ADuM125x family incorporate a hot-swap interface to prevent data corruption when an unpowered card is inserted onto an active bus.



The ADuM1250 provides two bidirectional channels supporting a complete isolated I2 C interface. The ADuM1251 provides one bidirectional
channel and one unidirectional channel for those applications in which a bidirectional clock is not required. Both devices are capable of operation up to 400 kbps and are compatible with SMBus and PMBus
protocols.

Contact the company directly for the product datasheet. The ADuM1250 and ADuM1251 are sampling now with full production release scheduled for October. Each of the devices is available in Pb-free 8-lead SOIC (small outline integrated circuit) packaging. The ADuM1250 priced at $3.38 and the ADuM1251 is $3.05 per unit in 1,000-piece quantities.

Analog Devices , 1-800-ANALOGD, www.analog.com

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