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Design of 2Mbps USB DAQ with matlab or labview

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jackobian

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I want to design usb daq that take signal of 2MHz as input and send it to pc via usb port to labview???
any idea please by using atmega,dspic,smt,xmega,....etc but with out FFGA
 

What is 2 MHz, sampling rate of an analog signal? If so how many bits?

If you want 2 MHz as sustained (continuous) data rate, you need high speed USB, none of the mentioned processors does support it. You need something faster like ARM or dedicated USB processor, e.g. Cypress FX2, or FTDI HS USB FIFO with hardwired ADC.
 
Sorry mis-writing,What I need is to make acquisition of 2 MHz and send result to pc via usb
 

OK, so you want to "design" it rather than buy a
USB DAQ unit off eBay for a few tens of dollars.
Not that the low end gear will hang with your
goal of (accurate) acquisition of a 2MHz baseband
signal.

Design always starts with "what do you want?".
That is barely formed, here. You talking 2MHz signal
at what resolution, accuracy (voltage and time)?
8 bits time resolution means 512MHz sample rate.
Not gonna find too many of those kind of ADCs
out there and the ones you do, are for RF with
very limited signal max range. So you'd have to
scale the input probably (range, unspecified at
present) to make any use, and your sample rate
exceeds USB2.0 bit rate (forget word rate).

The USB interface is digital and you can buy chips
for it, although the state machine is probably on
you to design (pump data from ADC to serializer).
Using a good-to-go USB interface chip (like FTDI)
gets you low level drivers and maybe even some
VI code in the vendor's or contrib-space to rip off.
 
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