STMicroelectronics STB6100
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An 8PSK/QPSK direct conversion tuner IC from STMicroelectronics.
A brochure about the STB6100, including basic specifications, pinout and logical diagram is available here http://www.st.com/content/ccc/resource/technical/document/data_brief/91/90/cf/d2/1e/8e/4f/6b/CD00043871.pdf/files/CD00043871.pdf/jcr:content/translations/en.CD00043871.pdf.
The full datasheet is not publicly available but some documentation can be found. For example, Comtech Technology has a product brief for a tuner module containing the STB6100 & STB0899, that outlines the basic register and timing info.
Fortunately the information available is sufficient to be able to write a driver for this IC.