cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 26

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

1.0 Functional Description
1.3 Device Description
1.3.1 Overview
1.3.2 Serial Interface
1-10
1.3 Device Description
The CX25870/871 is a video encoder designed for TV output of interlaced and
noninterlaced graphics data. Common applications requiring flicker-filtered TV
output include:
and flexible amounts of overscan compensation for high-quality display of
noninterlaced images on an interlaced TV . The CX25870/871 accomplishes this
by minimizing the flicker and controlling the amount of overscan so that the
entire image is viewable.
followed by a digital video encoder. The Color Space Converter/Flicker Filter
contains:
digital video encoder.
YP
will automatically insert trilevel synchronization pulses (when necessary) and
vertical synchronizing “broad pulses.” The CX25870/871 is compliant with
EIA770-3, SMPTE 274M/293M/296M and supports ATSC HDTV resolutions
including 480p, 720p, and 1080i.
The device includes a 2-wire read and write serial interface for programming the
registers in the device. The interface is designed to operate with 3.3 V levels. To
ensure that valid serial data is received and transmitted, make sure the VDD_SI
pin is connected to a stable 3.3 V supply. Review
Chapter 2.4
B
• desktop/portable PCs with TV Out
• high definition TVs
• DVD players and set top boxes
• graphic cards with TV Out
• game consoles
• set-top boxes
It incorporates normal and adaptive filtering technology for flicker removal
The CX25870/871 consists of a Color Space Converter/Flicker Filter engine
• A timing converter
• Various horizontal video processing functions
• Flicker filter and vertical scaler for overscan compensation
The output of this engine feeds into a FIFO for synchronization with the
The CX25870/871 provides Composite, S-Video, or 3-signal analog RGB or
P
R
HDTV output. While the encoder is in HDTV output mode, the device
for more details of the encoder’s serial interface.
Conexant
Flicker-Free Video Encoder with Ultrascale Technology
Chapter
2.2,
Chapter 2.3
CX25870/871
100381B
and