I thought they were made by microtune... although that may be the complete module itself rather than the main IC (which might be made by Temic).

http://www.microtune.com/products/1384_Series.html

I have attached the Microtune .PDF brochure but it's not what you're after


Attachments
104369-PB-00013 1384 Series.pdf (372 downloads)

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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)