THS8200IPFP Datasheet, PDF (28/104 Pages) Texas Instruments – All-Format Oversampled Component Video/PC Graphics D/A System

THS8200-EP
SLES253 – DECEMBER 2009
817.3 mV
751.1 mV
700.0 mV
Ramping Analog Output With Clipping Effect on Top and Bottom
Output After
Clipping
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51.1 mV
Output After
Clipping and
Shifting
0 64
255
511
767 ^{876 9401023}
Input Digital Codes
Figure 4-6. Effect of Shifting on Clipped Analog Output
Figure 4-5 and Figure 4-6 also show the analog output from the DAC if the full-scale video range over the
[64..940] input would correspond to the normal 700-mV range for component video. This full-scale range
is set by the selected FSADJ full-scale setting (register data_fsadj).
4.5.3 Multiplying
When the 10-bit range is not fully used for video, we can scale the input video data to use the full 10-bit
dynamic range of the DACs. Care should be taken not to over/underflow the available range after scaling.
This multiplying control serves two purposes:
• Use of the full 10-bit DAC range for inputs of reduced range.
• Individual fine gain control per channel to compensate for gain errors and provide white balance
control.
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Detailed Functional Description
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