How to write successfully user data to RAM in AD9957

I have applied 33MHz quartz (ILCX13) connected to REF_CLK pins. It works ok with single tone, so I would not expect any issues related to that. I have applied your suggestions and I get the signal at ca. 349 MHz for Q = 1 in the proposed formula for y(k):

short y = 0x0000;

short Q = 1;

for (int k = 0; k < 1024; k++)
{

y = round(32767*cos(Q*2*3.14159*k/1024));

RAMdata.bits31_16 = RAMvalue;
RAMdata.bits15_0 = 0x0000;

send(...)

}

However, if I change anything (e.g. Q = 2; or sin instead of cos) I get nothing at the output. Why such a simple change from cos() to sin() spoil the generation? By the way, I don't see any impact of PLL settings, like VCO range, on the generated signal. How, in that case, control the frequency of the arbitrary signal?

I have applied 33MHz quartz (ILCX13) connected to REF_CLK pins. It works ok with single tone, so I would not expect any issues related to that. I have applied your suggestions and I get the signal at ca. 349 MHz for Q = 1 in the proposed formula for y(k):

short y = 0x0000;

short Q = 1;

for (int k = 0; k < 1024; k++)
{

y = round(32767*cos(Q*2*3.14159*k/1024));

RAMdata.bits31_16 = RAMvalue;
RAMdata.bits15_0 = 0x0000;

send(...)

}

However, if I change anything (e.g. Q = 2; or sin instead of cos) I get nothing at the output. Why such a simple change from cos() to sin() spoil the generation? By the way, I don't see any impact of PLL settings, like VCO range, on the generated signal. How, in that case, control the frequency of the arbitrary signal?