THS8200IPFP Datasheet, PDF (27/104 Pages) Texas Instruments – All-Format Oversampled Component Video/PC Graphics D/A System

THS8200-EP
www.ti.com
SLES253 – DECEMBER 2009
4.5.1 Clipping
Clipping (limiting) of the video input data can be turned on or off on a per-channel basis, and selectively at
the high and/or low end, by programming the csm_<gy,rcr,bcb>_<high,low>_clip_on registers. The
high/low clipping values can be programmed on a per-channel basis using registers
csm_clip_<gy,rcr,bcb>_<high,low>.
Figure 4-5 shows a typical situation to clip ITU-R.BT601 sampled video signals.
817.3 mV
751.1 mV
Ramping Analog Output With Clipping Effect on Top and Bottom
Output After
Clipping
Output Before
Clipping
51.1 mV
0 64
255
511
767
Input Digital Codes
940 ₁₀₂₃
Figure 4-5. Effect of Clipping on Analog Output
4.5.2 Shifting
Next the video data can be shifted over a programmable amount downward. The number of codes over
which to shift the input video data is set per channel by programming csm_shift_<gy,rcr,bcb>. Shifting of
the input video data can be done downwards over 0..255 codes inside the CSM.
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Detailed Functional Description
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