1, the device selection: USB 2.0 devices: FX2 series of Cypress's; High Speed ??ADC:  TI, LT, AD 'high-speed (of 40MSPS ~ 80MSPS) 8-bit ADC series; high precision the ADC:  TI, the LT, the AD company's high-speed ( 2MSPS ~ 40MSPS) 12/14-bit ADC series; high- speed DAC: AD, LT company's high-speed (of 40MSPS ~ 80MSPS) 8-bit DAC series; high- speed high-precision DAC: AD, LT (20MSPS to 80MSPS) 12/14 DAC family.

2, the main features of the EX-USB FX2 EZ-USB FX2 chip includes an 8051 processor, a  serial interface engine (SIE), a USB transceiver, 8.5KB chip on the RA M, 4KB FIFO  memory as well as a general-purpose Programmable Interface (GPIF) and FX2 is a fully  integrated solution, it takes up less board space and reduce development time. EZ-USB  FX2 has a unique architecture, including an Intelligent Serial Interface Engine (SIE),  it performs all basic USB functions, freeing the embedded MCU to be used to implement  specific functions, and to ensure its continued high performance transmission rate.  FX2 also includes two general-purpose programmable interface (GPIF), allow it to "glue  then you can connect with any ASIC or DSP, and it supports all common bus standards,  including ATA, UTOPIA, EPP, and PCMCIA.EZ-USB FX2 is fully applicable in the USB 2.0,  and compatible with USB1.1. the FX2 There are three kinds of packages: SOPP of 56  feet, 100 feet TQFF (thin quad flat pack), 128-pin TQFP pin number difference is that  the input and output pin number different to requirements for different applications.