Interfacing ADC to FPGA altera DE2 board

[atif.india]

I am interfacing ADC with DE2 board. I am using ADC 0809. My problem is that ADC is giving output voltage as 5V for logic 1 and FPGa as 3.3V as logic high. Will there is any problem in connecting it directly or should i use any other ADC IC which gives o/p with 3.3V as logic high (compatible with FPGa) or do we have to use level shifter IC

 

[nxtech]

First check your FPGA datasheet to see if your part has 5V tolerant I/O. If it doesnt then you might want to look into selecting a different ADC.

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[aizou37]

i have 8 bit serial output from the ADC08831 how i connect it to my DE2 board. and first, how do i test the ADC chip?

 

[nxtech]

You connect it just like you would any other device. Write the code to manage the device. To get an idea goto Xilinx's web site and do a search for Coolrunner 2 app notes. They have one that details connecting an TI A/D to the device.


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