USB 3.0 isolator eliminates ground loops and ground potential differences

November 30, 2018 // By Julien Happich
Saelig's Alldaq ADQ-USB 3.0-ISO series of USB 3.0 isolators support the full USB 3.0 SuperSpeed data rate of 5Gbit/s, allowing USB 3.0 SuperSpeed devices to be electrically isolated from a host PC or other peripherals at full performance. The re-clocking design guarantees a stable USB connection at all speeds.

The ADQ-USB isolators can be used for the electrical isolation of USB measurement instruments to avoid ground loops to solve problems in industrial and automotive applications as well as in professional sound studios and event and show equipment. The units automatically detect SuperSpeed (5Gbit/s), High-Speed (480Mbit/s), Full-Speed (12Mbit/s) or Low-Speed (1.5 Mbit/s) connections. The model ADQ-USB 3.0-ISO-PS includes a +5 V power adapter with a lockable 5.5mm barrel connector (bayonet lock) for a safety. For industrial and automotive applications, the ADQ-USB 3.0-ISO-W version can accept 10 to 36 VDC from an external power source via a 2-pin lockable Phoenix-type connector to power devices with up to 900 mA. The external power input is protected against reverse polarity and short-circuits.

Isolation voltage between PC and USB device is 1kV (continuous) for the model ADQ-USB 3.0-ISO-PS and 1.0kV (< 60s) for the model ADQ-USB 3.0-ISO-W. The ESD protection of the data lines is ensured by transient-voltage-suppression diodes up to ±12kV (contact discharge) and ±15kV (air-gap discharge) according to IEC 61000-4-2. Without an external power supply the USB isolator can source up to 200mA at the device port. For USB devices requiring more current, the external power supply version ADQ-USB 3.0-ISO-W can provide 900 mA according to the USB 3.0 specification. Housed in a robust aluminium housing with rubber bumpers and designed for an operating temperature from -20 to +70ºC, the Alldaq USB 3.0-ISO isolators are suitable even for applications in harsh environments. An optional DIN rail mounting kit is also available for permanent installations.

Saelig -  www.saelig.com


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