USB Isolator - 100mA Isolated Low and Full Speed USB
If you're using a piece of USB test equipment with your PC and having issues with a shared ground, or you're the kind of person that shorts 5V to GND on your dev board and ruins the USB circuitry in your MacBook - then you need a USB isolator.
Our USB isolator lets the data go back and forth as normal - but keeps the two devices connected electrically-isolated. It's like a prophylactic for your computer's USB port.
The isolator supports both USB 1.1 and 2.0, (1.5 Mbps and 12 Mbps) which is selected via the DIP switch on the module.
Note that the isolator supports data only - you need to power your USB device using another method.
Download ADUM3160 datasheet (pdf)