In SX Microcontrollers, SX/B Compiler and SX-Key Tool, dpaton wrote:

Herold-

Max sample rate will be as much a function of your program as of the external ADC. With flash ADCs on the market capable of hundreds of millions of samples per second, you're entirely limited by how tight you can code and how much you want to spend. 

What do you consider "fast"?
What kind of interface do you need? SPI, I2C, parallel?
What kind of money can you spend on parts?
What else will your processor need to do in between samples?

These are all things we need to know before we can help further...

-dave

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