THS8200

The THS8200 device is a complete video back-end D/A solution for DVD players, personal video recorders and set-top boxes, or any system requiring the conversion of digital component video signals into the analog domain.

The THS8200 device can accept a variety of digital input formats, in 4:4:4 and 4:2:2 formats, over an interface of three, two, or one 10‑bit ports. The device synchronizes to incoming video data either through dedicated Hsync and Vsync inputs or through extraction of the sync information from embedded sync (SAV and EAV) codes inside the video stream. Alternatively, when the THS8200 is configured for generating PC graphics output, the device also provides a master timing mode in which it requests video data from an external (memory) source.

The THS8200 device contains a display timing generator that is completely programmable for all standard and nonstandard video formats up to the maximum supported pixel clock of 205 MSPS. Therefore, the device supports all component video and PC graphics (VESA) formats. A fully programmable 3x3 matrixing operation is included for color space conversion. All video formats, up to the HDTV 1080I and 720P formats, can also be internally 2x oversampled. Oversampling relaxes the need for sharp external analog reconstruction filters behind the DAC and improves the video frequency characteristic.

The output compliance range can be set through external adjustment resistors, and there is a choice of two settings to accommodate both component video or PC graphics (700-mV) and composite video (1.3‑V) outputs without hardware changes. An internal programmable clip/shift/multiply function on the video data assures standards-compliant video output ranges for either full 10-bit or reduced ITU-R.BT601 style video input. To avoid nonlinearities after scaling of the video range, the DACs have 11-bit resolution internally. Furthermore, a bi-level or tri-level sync with programmable amplitude (to support both 700-mV:300-mV and 714-mV:286-mV video:sync ratios) can be inserted either on the green/luma channel only or on all three output channels. This sync insertion is generated from additional current sources in the DACs such that the full DAC resolution remains available for the video range and preserves 100% of the 11-bit dynamic range of the DAC for video data.

The THS8200 optionally supports the pass-through of ancillary data embedded in the input video stream or can insert ancillary data into the 525P analog component output according to the CGMS data specification.