The family of DDS', AD9954, AD9953, AD9952 and the AD9951 use the same die,
and the AD9954 has the most features.
As sown here, the AD9954 can be used for evaluation of the AD9954, AD9953,
AD9952 and the AD9951:
Also, the ordering guide of the AD9951, AD9952, AD9953, AD9954 datasheets show
the AD9954/PCBZ as the evaluation system.