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Bi-directional optocoupler offers robust optical isolation

Posted: 20 Jan 2011 ?? ?Print Version ?Bookmark and Share

Keywords:bi-directional? logic gate optocoupler?

Design engineers working with industrial communication designs need to transmit high speed data over the communication fieldbus without the risk of damaging sensitive controllers, ADCs or sensors. The current solution uses two single-channel optocouplers or other technology, like magnetic or capacitive coupling, but this does not bring the desired level of reliable isolation and immunity to EMI.

To assist designers fulfill this challenge, Fairchild Semiconductor developed the FOD8012 ? a full duplex, bi-directional, logic gate optocoupler with high noise immunity as well as proven, reliable optical isolation. This optocoupler is suitable for industrial fieldbus communications, programmable logic control and servo control, as well as for inverter, factory automation, process control and test and measurement applications.

The FOD8012 supports isolated communications of digital signals between systems without conducting ground loops or hazardous voltages. Unlike competitive devices which provide less than 0.1mm optical isolation gap, the FOD8012 offers a 0.4mm (minimum) optical isolation gap for reliable isolation. The device also features a fast switching speed, up to 15Mbit/sec, and uses Fairchild's proprietary Optoplanar packaging technology and optimized IC design to achieve high common mode rejection (CMR) of 20kV/�s minimum, allowing the device to operate in noisy industrial environments.

Additionally, the FOD8012 offers an extended industrial temperature range of -40 to +110 degrees C and a 3.3V or 5V supply voltage to facilitate logic level translation. The device's high isolation voltage is certified by UL1577 and IEC60747-5-2 for increased reliability.

Pricing and availability: FOD8012 Samples are available now. Price is $3.08 for 1k-unit quantities, with delivery in 8-10 weeks.





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