How to use FPGA generate the digital sinwave code to dac?

[kivvzhou]

Hello,guys. Now I need use FPGA to generate the 12bit digital sinwave code (that mean the 12bit digital code restore to analog signal is a sinwavw)to control dac to test my dac SNR and SNDR, anyone can give me some suggestion how to generate this 12bit digital code use FPGA? thanks!

 

[FvM]

Most DDS designs use a lookup table, with or without interpolation.

 

[farhada]

I agree with FvM,
You can create a simple lookup table for 1/4th of your sinewave, then repeate it 4 times up and down to get the correct sinus output values.

The size of the lookup table depends on your frequency.

Take a look at this Xilinx App-note for some ideas on how to do it:

https://www.xilinx.com/support/documentation/application_notes/xapp448.pdf

 

[FvM]

Re: How to use FPGA generate the digital sinwave code to dac

A previous thread, that shows how a lookup table can be generated in VHDL code:

 

[shitansh]

Re: How to use FPGA generate the digital sinwave code to dac

hi,

I have generated different waves (sine, saqare, trialngle and sawtooth) and displayed on OLED display in my projecy refer this pdf.

http://www.actel.com/documents/M1AFS_EMBEDDED_KIT_Webserver_UG.pdf

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Shitansh Vaghela