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Isolated USB
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Isolating USB reduces noise and eliminates ground loops. But unlike optocouplers, IsoLoop isolators have unlimited life with no degradation.

Illustrative circuits are shown below:


Isolated USB UART Using an IL712

Isolating the input to a USB controller (rather than the bus lines) requires fewer isolation channels, and is therefore usually the simplest solution as shown in the following illustrative circuit:

Isolated USB UART Using an IL712

The Microchip MCP2200 is a USB 2.0 to UART Protocol Converter. The IL712/IL721 Series are best-in-class bidirectional isolators with a remarkable 100 ps of jitter, and parts are available in unique MSOPs to reduce board space.

 IL712-Series product details

 IL712-Series data sheet

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Isolated USB Controller Using IL710s

The IL710’s output enable makes it ideal for bidirectional interfaces such as USB. In this illustrative circuit, the directional output (pin 27) of the PLX/NetChip NET2890 transceiver enables the isolator channels in the active direction:

Isolated USB Controller Using IL710s

The IL710 is available in a unique MSOP for five channels of isolation on minimal board space.

 IL710-Series product details

 IL710-Series data sheet

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