Hi All!

How can I calculate the Vout voltage of AD9833? I found the equation in the datasheet but some data are missing from the datasheet.

Here is the equation:

VOUT = VREF × 18 × RLOAD / RSET × (1 + (SIN (2π (FREQREG × fMCLK × t/2^28 + PHASEREG / 2^12))))

VREF? VDD or something else?

t? signal period or something else?

If I connect the DDS to the follower opamp and the RSET = 6.8kOhm then Vout = 0.65V? Because the RLOAD is very high and the Vout max = 0.65V if the RSET = 6.8kOhm because the datasheet said Voutmax = 0.65V if the RSET = 6.8kOhm.

Sorry My english is not perfect.

Regards,

Adam

Hi,

This equation comes from the AD9834, and not sure why is there...

Anyway, answering your question, Vref = 1.15V typical.

t refer to the relative time when the sample is generated related to when you start to generate samples.

Regards,

Miguel