We use AD5439 in a signal generator. We found crosstalk between the two
channels when using the part. However, there is no crosstalk spec in the
datasheet .Would you please give some suggestion to this problem.
A table of crosstalk measurements is provided in the attachment using the
AD5415 which is the same core as the AD5449 which is the 12-bit version of the
AD5439. You should be getting similar figures to these. If not it's very much a
layout issue. Using decoupling caps, keeping tracks as far from each other as
possible etc, see further recommendations on layout in the datasheet.