Looking for a controller

Hi Everyone,

I am building an application which requires these specifications

1. ADC sampling at least 1 million samples per second

2. Low Power ( Battery powered device )

3. Hardware RTC

4. USB support

I have gone through the plethora of controllers( a comprehensive explanation of controller http://www.apogeeweb.net/article/58.html )offered by TI, but couldn't find one.

I would add:

1. ENOB 12 is good enough
2. Device will be battery operated, basically a handheld measuring device
3. USB device will do, any speed is fine ( It's good to have, if not present will do )

But with the first two requirements we require an in built hardware RTC, the device won't be having any internet access it's data will be access via PC and for first time time initialisation we require hardware RTC, since timestamp is critical for application.

Any suggestion is highly appreciated!