A DVB-T Demodulator produced by SPaSE and then later by Microtune as the MT8872. Successor of the SP8870.
Documentation is not available, a SDK only when signing an NDA. Requires a firmware that needs to get peeled out of the Windows-Driver.
A Linux-driver exists, but is known to work not well with all cards.
Used e.g. on some AVerMedia DVB-T cards.