Interleaving two AD9481 application

Document created by analog-archivist Employee on Feb 23, 2016Last modified by analog-archivist Employee on Feb 23, 2016
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I have two questions about "INTERLEAVING TWO AD9481s ". The datasheet shows the
description as below figure shown:
1. The phase offset between two ADCs' Clock should be 180 degree, isn't it?
2. How we deal with the two ADCs' DS Signal? The two ADCs' DS Signal shouldn't
be a same signal, isn't it?

 

1) Yes the phases between the two ADCs are 180° out of phase; however, that is
not sufficient in most cases.  There needs to be a fine tuned tweaking of the
two clocks to eliminate timing spurs.  See the attached article for more
information.
2) The DS is more for setting the ADCs to hand off data to a receiver with the
appropriate timing.  It does not affect the sampling time of the converter.

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