1.0 Functional Description
CX25870/871
1.3 Device Description
Flicker-Free Video Encoder with Ultrascale Technology
The three component video signals Y, PB, and PR will be coincident with
respect to each other within 5.0 ns. Any filtering that introduces group delay
exceeding 5.0 ns should be redesigned.
Figure 1-36. YPR PB Component Video Signals using 100/0/100/0 Color Bars as the Digital Input Signal (Courtesy–
EIA-770.2-A standard, page 8 and EIA-770.1 standard)
EIA770.1 EIA770.2-A
WHT YEL CYN GRN MGT RED BLU BLK
+714
+700
0
0
Y
–286
–300
EIA770.1 EIA770.2-A
+350
+350
PB
0
0
–350
–350
EIA770.1 EIA770.2-A
+350
+350
PR
0
0
–350
–350
CLAMP PERIOD
SYNC PERIOD
100381_098
To switch the device into 480i Component Video Output Mode with bilevel
syncs embedded into each of the three YPRPB analog outputs, first, program up
the CX25870/871 into a fully functional NTSC over-scan solution where
Composite and/or S-Video is being generated out of at least three of the encoder’s
outputs. Next, change the registers found in Table 1-27 to the indicated values.
1-82
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
