Testing Analog-to-Digital Converter, Spartan-3A, LTC1407-A
in [FPGA]
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From: m m on 13 Oct 2008 12:07 Hi: I need to test some VHDL codes, which are commanding the LTC1407-A Analog-to-Digital converter of the Spartan-3A, to take a sample on its voltage input pin. The results of the conversion will be displayed on the LCD. The problem is that my background is not in electrical engineering and I would like to know of a way (online tutorial, etc) to test these codes, by sending the voltage output of the digital-to-analog- converter (LTC2624 model) to the input pin of the analog-to-digital converter. I already confirmed, through an oscilloscope, that the DAC is sending the voltage as I need it. Basically the FPGA application sends a voltage and immediately after that, commands the analog-to-digital converter to take a sample. I have a cable, which bought in the Digilent Web site for the pins of both terminals. A "6 Pin MTE Cable" found at : http://www.digilentinc.com/Products/Catalog.cfm?Nav1=Products&Nav2=Cables&Cat=Cable ... however I received the advise that I need to make by myself a circuit to join the ground pin with another pin... and that for these steps I need to work with a resistor... etc... [ honestly I didn't understand much ] Is there a simpler way to successfully send the voltage output of the Digital-to-Analog converter to the voltage input of the Analog-to- Digital converter? Thank you, m __ m __________________________ LTC1407-A : http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1155,C1001,C1150,P2485 LTC2624 (DAC) : http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1155,C1005,C1156,P2048
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