NCO - Sine problem

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Hello guys,

I have a little problem with the sine wave from NCO generator.

Schematic:

https://alteraforum.com/forum/attachment.php?attachmentid=13827&stc=1

I want to produce a 0.5 MHz 10bit sine wave. On the oscilloscope i get something like this:

https://alteraforum.com/forum/attachment.php?attachmentid=13829&stc=1

I am using DE0-CV BOARD with ladder 10 bit DAC. It seems to be a problem with the sign of amplitude but how to resolve it.

Thanks for any suggestions :)

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try invert sign bit before sending to DAC