Hello & welcome,
There are a few ways to go: use Adobe Photoshop, or Adobe Acrobat to make a bitmap, or you can use a program called
Universal Document Converter. That link takes you to the thread here on this forum, where Mark Toce mentioned it.
Any of these will produce a bitmap file (BMP or JPG) that you can then insert into DataCAD 10, scale it, and if you need vectors, you will have to trace it, or you might try aa program like Scan2CAD, that will "automatically" convert a bitmap to vectors.
None of these is ideal, and the results might be on the rough side -- can you get a DWG or DXF file from this person, instead?