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AD9914 Dircet Mode Usage's Clocking (Sync or can it be Async)

Question asked by Sercan on Nov 7, 2014
Latest reply on Nov 11, 2014 by Sercan

Hi,

 

For direct mode usage of AD9914, can we use async Function & 32 bit data to program DDS's FTW,AMP or POW output?
OR
Do we have a constraint to use DDS in the direct mode only with synchroneous clocking (by using DDS's SYNC_CLK)?

 

Info:

Datasheet's "Setup Time To SYNC_CLK" AC Specs says that Func & 32 bit data bits have to be settled 2 ns before the SYNC_CLK.
With this info, i come to a conclusion that,we have a constraint to use DDS in the direct mode only with synchroneous clocking (by using DDS's SYNC_CLK)?

Where,

there is no other exact information at the datasheet, which was there is a constraint like that.

So, in order to be sure i am going to make some experiments with my AD9914 Ev.Board.

Sure,
I don't have a proper test setup.
Most probably, i am going to use pulse generator, etc.
If you know the answer of my new question it will be a nice plus for me.

 

Do we have a constraint to use DDS in the direct mode only with synchroneous clocking (by using DDS's SYNC_CLK)?

Cause, if we use async clk, then at many moments we will violate the 2 ns "Setup Time To SYNC_CLK" AC Specs. And i guess that this will result with unwanted FTW, AMP & POW values.

 

Regards,
Sercan

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