Some years back, I designed/built a little sine/cosine generator based on the B-B 4423 chip. Long discontinued but old stock can sometimes be found.
If interested, you can see the datasheet here: http://www.icmaster.com/PartDetails.aspx?Part=1440941204&InStock=False
Kal
If interested, you can see the datasheet here: http://www.icmaster.com/PartDetails.aspx?Part=1440941204&InStock=False
Kal