Hello,

I would want to know if generators DDS as the AD9851 can be configurable to produce a signal at the precise moment with a number of fixed period.

Thank you,

Mikael

Hello,

I would want to know if generators DDS as the AD9851 can be configurable to produce a signal at the precise moment with a number of fixed period.

Thank you,

Mikael

Hi Mikael,

Yes. For AD9851, you can issue frequency update (FQ_UD) to transfer data from buffer register to active register. Looking at the timing characteristics, the latency defines how many clock cycles before frequency or phase output changes. So, a sinusoidal signal is expected at the output after 18 SYSCLK cycles. So if you have a SYCLK of 180MHz, period would be 5.56ns, you can then compute the number of periods to produce a signal.

Hope this helps,

Sitti

Hi Mikael,

Yes. For AD9851, you can issue frequency update (FQ_UD) to transfer data from buffer register to active register. Looking at the timing characteristics, the latency defines how many clock cycles before frequency or phase output changes. So, a sinusoidal signal is expected at the output after 18 SYSCLK cycles. So if you have a SYCLK of 180MHz, period would be 5.56ns, you can then compute the number of periods to produce a signal.

Hope this helps,

Sitti