I was curious, I pulled apart my
BlackMagic Intensity Shuttle for ThunderboltThis is the list of electronics inside.
ADV7604 HDMI receiver with analog interface. It is Hdmi 1.3/HDCP 1.3 with 12 bit/deep color support. It has a 12-bit ADC
ADV7180 10-bit SD analog video decoder with 2D 5-line comb filter / 10-bit ADC
ADV7393 10-bit SD/HD video decoder /10-bit ADC
Cirrus Logic CS4256 24-bit/192kHz transmitter. This chip has 5 functions in one, perhaps responsible for the entire audio side of the board.
There is also AD98898 for ADC, perhaps to digitize the analog audio inputs.
A Spartan-6 series FPGA