I looked at PIC32MZ (EF series) and it has 6 ADC modules which can sample simultaneously @ 3.125 Msps each. It supports high speed USB and can also run at 200MHz. If you get a board with it, it'll be much easier than combining 2 STM boards.

 

BTW: Very nice project! How many channels do you have?

Thanks - two channels.

 

I looked at PIC32MZ (EF series) and it has 6 ADC modules which can sample simultaneously @ 3.125 Msps each. It supports high speed USB and can also run at 200MHz. If you get a board with it, it'll be much easier than combining 2 STM boards.

thanks, you mean this board here?
http://uk.rs-online.com/web/p/processor-microcontroller-development-kits/9048455/
Do you know if I can directly connect my conditioned analog signals to the ADCs' inputs or have to get the adaptor boards?

 

thanks, you mean this board here?
http://uk.rs-online.com/web/p/processor-microcontroller-development-kits/9048455/
Do you know if I can directly connect my conditioned analog signals to the ADCs' inputs or have to get the adaptor boards?

I don't work with boards. I know you can connect the ADC signal directly to the pins (provided they're 0V to VRef+, typically 0V to 3.3V). I don't know if enough analog pins are exposed on this board and whether the PCB layout is suitable. Most likely, there wouldn't be any problems, but it won't hurt to look at the board schematics and layout to check these things.

The signal you use must have low impedance. The lower the impedance, the faster you can sample.

BTW: Buying it directly from Microchip might be cheaper, and I noticed they have a sale:

http://www.microchipdirect.com/productsearch.aspx?Keywords=DM320007

 

Your conditioned signal will probably come from OPAmp output - and it is the best source for ADC converter.