Most certainly, the power supply requirements of the AustriaMicrosystems device are designed to integrate with the USB standard, as the USB interface is resident in the SOC.
If you have a look at the published AMS datasheets, there are some really cool functionalities available that are not currently used on the Sansa. There are some capabilities I’d love to use, but these are more logically implemented on a larger player.
For additional information or queries regarding the device, you can contact AustriaMicrosystems. The 3525 family is but one of many versions. The current Sansa device has integrated memory.
Bob 
