Datasheet

0
1023
0
700
512 350
700 mV
Input
Codes
V
O
mV
300 mV
300 mV
0
1023
350
1050
50
300 mV
300 mV
700 mV
Input
Codes
V
O
mV
THS8135
www.ti.com SLAS343B –MAY 2001–REVISED APRIL 2013
Figure 1 through Figure 4 show the nominal output voltage levels for full- or reduced-range input code range
configurations on R, G, B, and Y versus Cb and Cr channels.
Note that in full-scale input code range configuration, the blanking level is at 350 mV on all outputs; while in
reduced-scale operation it is at 400 mV on all outputs.
In reduced scale modes, after proper adjustment of R
FS
, the nominal 700-mV output compliance is reached from
an input code range of only 876 ( = 940-64) codes on G/Y, and of only 896 ( = 960-64) codes on R/Pr and B/Pr
output channels. The maximum excursions are ~817 mV ( = 1023/876 × 700 mV) on G/Y and ~800 mV ( =
876/896 × 817 mV) on B/Pb and R/Pr channels. Figure 4 shows that when using reduced-scale input code
range, the blanking level needs to be at 400 mV to accommodate the maximum negative excursion on B/Pr and
R/Pr channels.
The figures also show the excursions for the sync level positions in either full-scale or reduced-scale
configurations. These levels are internally adjusted and assure 300-mV sync excursions when using nominal
termination loads and properly adjusting R
FS
, as previously explained.
NOTE: Choose R
FS
for 700 mV from input codes 0−1023 on Y.
Figure 1. YRGB Outputs, Full-Scale Input Code Range
Figure 2. CbCr Outputs, Full-Scale Input Code Range
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