QWhat is the precison can I except on temperature range: the output is 0.65V max
Do you confirm that the rejection of 2nd harmonic is 65 dB.
AThe frequency precision of any DDS system is as good
as its reference frequency. The AD9833 & AD9834 use
external reference source, so that reference must have
the frequency stability that you need in your system.
The output of the DAC is a current into a 200 Ohm load.
The scale factor is defined by the reference. The AD9833
has a TC of 200 ppm/°C (Max) and the AD9834 has a TC of
100 ppm/°C (Max) so the worst case amplitude stability
will be 200 or 200 ppm/°C depending on which device you
The THD of these devices (sine wave output) is typically
-66 dB, but can be as bad, at some frequency codes, as
-56 dB. You should be able to build a generator with
-65 dB 2nd harmonic without much trouble if you can choose
your reference frequency/division ration or use quite a
simple filter at the output (or, of course, both).
To raise the current output of the device to a 10V p-p
signal you should use an op-amp in I-V mode.