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I am currently using ADuM4160 by Analog Devices as a USB isolator.

However, this part is EXPENSIVE. I was wondering if anyone thinks it can be replaced with ADuM2200.

Any reason why this wouldn't work? If so, any thing that needs to be done to make it work?

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Absolutely not.

The ADuM4160 is expensive because it has five internal isolation channels. USB is a complex bus, as it's both bi-directional and differential. It's not easy or simple to isolate.

Also, the isolator needs to be fairly fast, USB-2.0 full-speed has a 12 Mbps signaling rate. Looking at a similar-speed 4-channel ADuM isolator, the costs are about the same.

Basically, there is no way to easily reduce the cost. Within the ADuM product line, the ADuM4160 is price-competitive with other devices of similar complexity.

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Another way to save money would be to use a device with a lower insulation rating. Depending on your insulation rating needs (2.5kV vs 5kV) you might also consider the less expensive ADuM3160 as well. It is actually the same part, but will only isolate to half of the voltage.

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Doubt it. USB is a bidirectional bus that uses differential signals, and the ADuM220 is a one-way isolator that uses ground-referenced logic. Isolating bidirectional buses is more difficult than one-way buses.

I'm not sure, but I think if you build a device using the ADuM4160, it might comply to the USB standard, but if you jury-rig something out of combined one-way isolators, it wouldn't be likely to.

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