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For some areas like medical equipment or test equipment it is required to galvanically insolate the peripheral from the PC. This little device serves this purpose.
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It can be jumpered for USB powered or externally powered. The mini USB port serves as a power connector. A cellphone AC adapter can be used as long as it is isolated. In order to insolate the USB power the Traco DC/DC converter is used.
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The key part is an ADuM4160 from Analog Devices. It can do low speed and full speed. Unfortunately high speed is not supported by the ADuM4160.
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The mini USB power port and USB-A device port .
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The cable is connected directly to the PCB.
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