Design of a data acquisition system based on TMS320VC5509 and AD7322

In order to enhance the signal sampling rate and conversion accuracy and to reduce system power consumption,a kind of dada acquisition system is designed based on the fixed-point DSP TMS320VC5509 and 2-channel,software-selectable,true bipolar input,1MSPS,12-Bit plus sign,successive approximation type ADC,AD7322,and the principle of hardware circuit and the method of connection and acquisition process are introduced.TCD1206SUP linear CCD with 2160 cells is adopted as image sensor,after CCD completes scanning data,the output of video signals will be filtered by a second-order active low pass circuit,these signals will be collected by the high speed serial ADC,AD7322,which will convert them to digital signals and be sent into DSP.The test result indicates that the system scheme designed is reasonable and design purpose and requirement are reached.