| Electronics > Projects, Designs, and Technical Stuff |
| Isolated USB 3.0 |
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| wholder:
I just ran across a new USB isolator that claims to run at USB 3.0 speeds. Would love to know what chipset is used inside to accomplish this. Also, if anyone has purchased and used this device, please pass on your thoughts how well it works. https://www.saelig.com/product/adq-usb-iso-ps.htm Wayne |
| coppice:
There are several USB3 5Gbps isolator gadgets available. I don't know what devices any specific gadget may use, but things like http://www.advancedphotonics.co.jp/en/usb3-isolator.html exist for this purpose, |
| DaJMasta:
A lot of high bandwidth options are actually on-chip optical RF links. They modulate the incoming data onto the optical signal, then demodulate it a few mm away where it's received on the opposite side. You can get a lot of data through a single channel that way, and the isolation is as high as you put the transmit and receive diodes. |
| Doctorandus_P:
The block diagram on page 2 of the datasheet suggests a capacative barrier. This seems a logical choise. Capacitors work better at high frequencies. Capacitive barriers are also already being used in similar applications (Was it in the ADUC.... signal isolators?) and in MOSfet drivers such as IR2102. Optical fibres (with their electronics) go upto much higher bandwidts, but might not be available for the right price point :) Curios if some RF link would be doable. A low power transmitter and receiver in a metal can could be very low cost. Look at the multitude of 2.4GHz WiFi and other transceiver chips. A few of those links could be used in parallel. With short distance and shielded metal can these transceivers could be very simple. Even some pulsed theme similar to the principle of the very old spark-gap transmitters. |
| SiliconWizard:
I think TI's (and SiLabs?) digital isolators typically are capacitive, whereas AD's ones (ADuM series for instance) use micro-transformers. The fastest I could find so far from AD is this one: https://www.analog.com/en/products/adn4654.html (1.1Gbps). One alternative possible approach could be to use 10G ethernet transformers such as this: https://www.haloelectronics.com/products/lan/ethernet/discrete-transformers/10g/ of course with appropriate signal conditioning... (not necessarily trivial). Or yet another one could be to use USB 3.0 transceivers such as this: http://www.ti.com/product/TUSB1310A and isolating at the PIPE interface-level, which is "much" slower at 250MHz. That would probably be pretty expensive. The Advanced Photonics isolator seems great. Didn't know these products. Would be a likely candidate if the diagram didn't suggest a capacitive isolation (and also the size of the box which give hints about the circuit's size, although it may be deceptively empty...) |
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