AD9833: Difference between AD9833 and AD9834

Document created by analog-archivist Employee on Feb 23, 2016
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I want to use one of these two DDS chips (AD9833/AD9834) to generate a square
wave signal of 10...90kHz from a 7.2Mhz clock. All I need is a square wave
output. I therefore don't need the DAC running but intend to use the MSB output
only.
My questions are:
1. Are there any fundamental differences between the two devices when used for
my application?
2. Is there a difference in current consumption?
3. Is there a difference in terms of long term availability?

 

Both device are almost identical in terms of functionality. Both can do your
requirement. The subtle difference can be seen in both block diagrams p1 of its
datasheet and in the specs table (for a full list of subtle differences). Just
a quick summary to answer your point is ;

1. Are there any fundamental differences between the two devices when used for
my application?
#1. No fundamental differences between the two devices when used for your
application when the DAC is not taken into account.

2. Is there a difference in current consumption?
#2.For an exact comparison see current consumption graph (e.g. TPC1 Vs fig 7
etc) for the relevant part in order to see the difference.

3. Is there a difference in terms of long term availability?
#3. No, not at the moment, also we can not guarantee due to future market
demand/trends .

Bottom line is AD9833 is simpler in term of interface. both package are
different. Its really down to preference and above as outline.

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