CONEXANT CX25874 Video encoder with hdtv output Datasheet

digital
infotainment
products
High Performance
Video Encoder with
HDTV Output
CX25874/CX25875
Highest-Quality Video Encoder with
“Adaptive” Flicker Filtering and HDTV Output
Conexant’s CX25874 and CX25875 video encoders are specifically
designed to meet TV-out cost and performance requirements for
next-generation desktop and notebook PCs, game consoles and
set-top boxes. With software forward compatibility to the CX25870
and CX25871, manufacturers can quickly bring to market new solutions
that provide adaptive flicker filtering, ATSC High-Definition Television
(HDTV) output, and true international television display (NTSC, PAL
and SECAM output). The CX25874 and CX25875 support resolutions
from 320 x 200 to 1024 x 768 and programmable overscan ratios from
0% to 25%. The CX25874 and CX25875 also provide 48 automatic
configuration modes and offer 10-bit DACs.
HDTV Output
HDTV is here. More than 1 million consumers have purchased
HDTV sets. With the start of this television set transition, TV-out
capability must now include the ability to connect PCs, set-top
boxes, DVD players and game consoles to HDTV television sets.
Distinguishing Features
• True international support for
NTSC, PAL and SECAM output
• HDTV output capability
The CX25874 and CX25875 can convert either YCrCb or RGB input
to HDTV output. While the CX25874 and CX25875 are in HDTV output
mode, the device will provide either analog RGB or analog YPBPR
signals and automatically insert tri-level synchronization pulses
• Adaptive flicker filtering
• Supports resolutions from 320 x 200
to 1024 x 768
(when necessary) and vertical synchronizing “broad pulses”.
• Software forward compatible
with the CX25870 and CX25871
The CX25874 and CX25875 are compliant with all existing HDTV
• Programmable overscan ratios
from 0% to 25%
standards including EIA770-4, SMPTE 274M/293M/296M and support
all ATSC HDTV resolutions including 480p, 720p and 1080i.
• Pin compatible with CX25872 and CX25873
• 64-pin TQFP
digital
infotainment
products
High Performance
Video Encoder with
HDTV Output
CX25874/CX25875
Adaptive Flicker Filtering
Signaling (WSS) 16:9 aspect ratio. The international
The CX25874 and CX25875 include Conexant’s unique
standards supported include NTSC (North America,
adaptive flicker-filtering capability. With this feature, the
Taiwan, Japan), PAL-B, D, G, H, I (Europe, Asia), PAL-M
optimal amount of flicker filtering for a given application
(Brazil), PAL-N (Paraguay), PAL-Nc (Argentina), PAL-60,
is automatically determined by the characteristics of the
ECAM-D, K, K1 (Russia), SECAM-B, G, H (Middle East)
pixel content. Now both an Excel spreadsheet and DVD
and SECAM-L (France).
movie can look great at the same time. Consumers
do not have to manually adjust the amount of flicker
Pixel Input Formats and Timing
filtering as they switch from applications requiring
The CX25874 and CX25875 convert a wide range
significant flicker filtering (e.g., text-intensive applications
of input formats to television video formats. The input
like an Excel spreadsheet) to those requiring little or no
resolution can be non-interlaced with an active
flicker filtering (e.g., a DVD movie).
resolution of 320 x 200 to 1024 x 768 or interlaced
such as CCIR601, CCIR656 and VESA VIP. Conexant
International Support
is the only provider of video encoders that have the
The CX25874 and CX25875 provide the most complete
flexibility to offer any resolution in this range with
support for products with TV-out functionality shipped
so many input and output format options. This includes
to the U.S. and international markets. The CX25874
the exact resolution to display DVD movies in either
and CX25875 support SCART and Wide Screen
NTSC or PAL formats.
Automatic Configuration Modes
CGMS Support
The CX25874 and CX25875 offer enhanced automatic
The CX25874 and CX25875 support the complete CGMS
configuration mode functionality. A total of 48 different
set of standards. This includes 480i, 480p/525p, 720p/750p
modes are now available which provide pre-programmed
and 1080i/1125i.
register settings for more than 95% of typical TV-out
settings. For example, PAL-M can be automatically
Overscan Compensation
configured to an input resolution of 640 x 480 RGB with
The CX25874 and CX25875 support overscan ratios as
a moderate amount of overscan compensation with just
low as 0% (truly to the bezel of the TV) and as high as
a single register write.
25% (25% of the screen will be black).
Macrovision™ Support
The CX25875 provides Macrovision 7.1.L1 copy protection
and Macrovision 525/625p specification compliance.
P[11:0]
Input
Demux
HSYNC
VSYNC
BLANK
FIELD
Timing
Color Space
Conversion
#1
Flicker
Filter/Scaler
FIFO
FSADJUST
COMP
Internal
Reference
VREF
SIC
SID
ALTADDR
Serial
Interface
Video
Encoder
RESET
DAC
Mux
SLEEP
Color Space
Conversion
#2
10-bit
DACA
10-bit
DACB
10-bit
DACC
10-bit
DACD
VBIAS
to internal clocks
XTALIN
XTALOUT
XTAL
OSC
PLL
Clock
Generation
XTL_BFO
CX25874/CX25875 block diagram
Bias
Gen
CLK 0
CLK 1
features
and
specifications
Product Features
• HDTV output
• CGMS support
• Adaptive flicker filtering for enhanced
image and text sharpness
• 5-line vertical and horizontal
flicker filtering
• Supports any input resolution from
320 x 200 to 1024 x 768
• 48 automatic configuration modes
• Programmable power management
• Software-forward compatibility with
the CX25870 and CX25871
• Pin compatibility with the CX25872
and CX25873
• SCART
• WSS 16:9 (wide screen signaling)
support
• Macrovision 7.1.L1 copy protection
(CX25875 only)
• 525p/625p specification compliance
(CX25875 only)
• 10-bit DACs for superior picture quality
• Overscan compensation ratios
from 0 to 25%
• Serial programming interface
• Buffered crystal clock output
• NTSC/PAL/SECAM TV outputs:
– Interlaced or non-interlaced
– Composite
– S-video (Y/C)
– Simultaneous S-video and
Composite
– YUV
www.conexant.com
© 2001, Conexant Systems, Inc. All Rights Reserved.
General Information:
Conexant and the Conexant logo are trademarks
of Conexant Systems, Inc. Other trademarks are
U.S. and Canada: (800) 854-8099
owned by their respective owners. Although Conexant
International: (949) 483-6996
strives for accuracy in all its publications, this material
Headquarters – Newport Beach
may contain errors or omissions and is subject to
change without notice.
THIS MATERIAL IS PROVIDED AS IS
4311 Jamboree Rd, P.O. Box C
AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
Newport Beach, CA 92660-3095
INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR
Order# 101812A
01-0916
PURPOSE AND NON-INFRINGEMENT.
Conexant shall not be
liable for any special, indirect, incidental or consequential
damages as a result of its use.
• YCrCb non-interlaced input to
interlaced output
– 16-bit 4:2:2 multiplexed 8-bit input
– 24-bit 4:4:4 multiplexed 12-bit input
• RGB non-interlaced input to
interlaced output
– 15/16-bit multiplexed 8-bit input
– 24-bit multiplexed 12-bit input
• RGB non-interlaced input to RGB
non-interlaced output
– 15/16-bit multiplexed 8-bit input
– 24-bit multiplexed 12-bit input
• RGB or YCrCb interlaced input to
interlaced output
– CCIR656
– CCIR601/DVD
– VESA VIP
• 64-pin TQFP
Applications
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Desktop PCs
Graphics cards
Notebook computers
Game consoles
Digital television receiver cards
Living room PCs
Internet PCs
Progressive DVD players
Set-top boxes
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