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and search for "dds". I have used so far the Ad9850, Ad9851. There are relatively easy to use and very precise. Furthermore you will find many articles and complete projects with these ICs on the web (try google with ad9851 and/or dds).
i think you are looking for true DDS based waveform generator chip or Arbitrary Waveform Generator chip.
but most chips are designed for different applications, so it is not easy to find out exact purpose.