Datasheet

1023
940
817.3 mV
751.1 mV
51.1 mV
255 767511
64
0
Input Digital Codes
Analog Output From DACs
Ramping Analog Output With Clipping Effect on Top and Bottom
700.0 mV
876
Output After
Clipping and
Shifting
Output After
Clipping
THS8200
SLES032D –JUNE 2002–REVISED JUNE 2013 www.ti.com
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.
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, scale the input video data to use the full 10-bit dynamic
range of the DACs. Care should be taken not to overflow/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.
26 Detailed Functional Description Copyright © 2002–2013, Texas Instruments Incorporated
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