Hello,
this might be interesting for you too:
**broken link removed**
These device are a good alternative!
NVE's Isolation Products Business Group is building a continually expanding family of galvanically-isolated signal interface products based on our patented IsoLoop® technology. This technology allows on-chip isolation, providing unprecedented performance characteristics. The IsoLoop's characteristics include high speed, small size, minimal pulse width distortion and high common mode rejection coupled with a high stand off voltage. When this device is integrated with the appropriate on-chip electronics, a wide variety of integrated devices having isolated interfaces can be created.