AD9910 DDS

If I switch from one profile register to another will the phase of the RF output be continuous?  For example if Profile 1 has a sine wave of 5 MHz, phase = 0 and Profile 2 has a sine wave of 10 MHz, phase = 0, and I switch the output from Profile 1 to Profile 2 will the phase  of the RF output be continuous?  Or will there be a discontinuity in the output at the time of the switch? 

I've measured it and found a discontinuity.  What do I have to do to change the frequency of the output and keep the phase continuous?

Also, I've found that is I keep Profile 1 active and just write a new frequency into it while it's running there doesn't seem to be a discontinuity in the phase.  Assuming this works is it ok to just keep the same profile active and write different frequency into it while the output is on?

Thanks,

David Heedy

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