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AD9920A programming problem

Question asked by APU on Feb 2, 2015
Latest reply on Feb 4, 2015 by APU

Hello! I try to program internal registers, but I can't get proper waveform on HD. I do all according to "power up sequence for master...". I program HDLENO and HDLENE = 1380, HDRISE=40 VDRISE=0. In this case I get constant 1 on HD and VD.

When I write HDRISE=VDRISE=0, I get HD every 36 clocks, I get VD in this case too, according to my VDLEN register value.I use 1VPAT, 1VSEQ, 1FIELD.

Can anybody advice, what is wrong?

 

Thanks a lot!

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