cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 97

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
100381B
Active Line
Pixels per
720
Active Lines
per Frame
480
more lifelike colors and crisper detail. Because the video information is
transferred over three separate connecting cables instead of two (for S-Video) or
one (for Coaxial or RCA/Composite), 480i Component Video yields the best
standard definition TV quality available. However, because we are still dealing
with standard 480 line interlaced resolutions, this format remains inferior to
High-Definition TV .
Digital TV set top boxes, Satellite DBS Receiver Decoders, and DVD players.
Input media capable of decoding ColorStream include television receivers and/or
monitors.
converters are available for encoding. This results in a D/A conversion more
accurate than conventional 8-bit, 13.500 MHz systems. The end result is a more
artifact-free and clear image.
television analog component video interface are as follows:
Video luminance signal has a peak amplitude of 700 mV from the blanking level,
with zero setup. A negative-going bilevel sync pulse of 300 mV , conforming to
the timing requirements in Figure 1.3-a, is added to the Luma signal as the only
timing reference for the complete Y P
maximum peak amplitude of ± 350 mV. The DC level of P
horizontal line shown in
voltage of 0 V . It will be generated in conformance with the EIA 770.2-A and
EIA770.1 standards. The only differences between these standards are the
presence of the 7.5 IRE setup pedestal and slightly different luminance levels.
Check
standard.
The advantage of this type of video is increased image quality combined with
Output devices used for generating this format include, but are not limited to,
While in the Component Video mode, all 10-bits of the CX25870’s D/A
Some major characteristics governing the interlaced standard definition
• The digital input stream can be received in a progressive (i.e.,
• Each field will be divided into an active picture area and a vertical
• The 480i video output will be capable of either a 4:3 or 16:9 aspect ratio
If configured properly, the CX25870’s EIA 770.2-A compliant Component
Neither P
noninterlaced) format or interlaced format. Interlaced data must be
transmitted as ODD–EVEN–ODD … fields. The fields carry every other
scan line in succession with succeeding fields carrying the lines not
scanned by the previous field.
blanking interval (VBI). Similarly, each line will be divided into an active
pixel area and a horizontal blanking interval.
through embedding of Wide Screen Signaling (WSS) bits into the
appropriate lines in the VBI. Review the section 1.3.35 in the data sheet for
more details.
Tables 1-27
Frame Rate
30 / 1.001
(Hz)
R
nor P
and
Conexant
B
will contain an embedded sync pulse. Both will have a
1-28
Figure 1-36
Scanning
Interlaced
Format
Output
for complete programming instructions for either
below will be at reference black with a
R
P
B
Total Samples
set of signals.
per Line
858
1.0 Functional Description
R
Total Liens per
and P
1.3 Device Description
Frame
525
B
during the
1-81