CX25871 Datasheet
Adaptive Flicker Filter Video Encoder
Download: CX25871 Datasheet 
CX25871
Adaptive Flicker Filter Video Encoder
digital infotainment products
CX25870/871
Highest-Quality Video Encoder with "Adaptive" Flicker Filtering
Conexant's Cx25870/871 Is Specifically Designed To Meet Tv Out System Requirements For The
Next-generation Desktop Pcs, Notebook Pcs, Game Consoles And Set-top Boxes. With Pin- And
Software-forward Compatibility To The Bt868/869, Manufacturers Can Quickly Bring To Market New
Solutions That Support Adaptive Flicker Filtering, Atsc High Definition Television (hdtv) Output,
True International Television Display (ntsc, Pal And Secam Output), And Resolutions From 320 X 200
to 1024 x 768. The CX25870/871 supports all
Features Of The Market's Most Popular Pc Video Encoder, Bt868/869, Including 5-line Vertical And
horizontal flicker filtering, overscan compensation and 10-bit DACs.
International Support
The Cx25870/871 Provides The Most Complete Support For Products With Tv Out Capability Shipped Into
The U.s. And International Markets. Support For Scart And Wss 16:9 (wide Screen Signaling) Per Eiaj
Cpr-1204 And Itu-r Bt.119 Are Now Built In. The Cx25870/871 Provides Support Of International
Standards Including Ntsc (north America, Taiwan, Japan), Pal-b, D, G, H, I (europe, Asia), Pal-m
(brazil), Pal-n (paraguay), Pal-nc (argentina), Pal-60, Secam-d, K, K1 (russia), Secam-b, G, H
(Middle East) and SECAM-L (France).
Distinguishing
FEATURES
True international support for NTSC, PAL and SECAM output
HDTV output capability
Adaptive flicker filtering
Supports resolutions from 320 x 200 to
1024 x 768
Pin- and software-forward compatible
with the Bt868/869
digital infotainment products
CX25870/871
HDTV Output Mode
Hdtv Is The Wave Of The Future. Consumers Are Beginning To Purchase Their First Hdtv Sets. With The
Start Of This Television Set Transition, Tv Out Capability Must Now Include The Ability To Connect
And Display Pc, Set-top Box And Game Console Content On These New Hdtv Television Sets.
The Cx25870/871 Provides An Hdtv Output Capability Which Generates Either The Analog Rgb Or Analog
Ypbpr Component Video Output Necessary For Driving A Hdtv's High Definition Input Port. While The
Cx25870/871 Is In Hdtv Output Mode, The Device Will Provide Either Analog Rgb Or Analogypbpr Signals
and
Automatically Insert Tri-level 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.
Adaptive Flicker Filtering
The Cx25870/871 Provides Conexant's Unique Adaptive Flicker Filtering Capability. This Feature Gives
New Meaning To The Words "end-user Ease Of Use" By Providing The Ability To Automatically Determine
the optimal amount of flicker filtering for a given
Application. Now, consumers do not have to manually adjust the
CX25870/871 architecture block diagram
amount of flicker filtering as they switch from
Applications requiring significant flicker filtering (e.g. text intensive
Applications Like An Excel Spreadsheet) To Those Requiring Little Or No Flicker Filtering (e.g. A
DVD movie). The CX25870/871 does this automatically, even when two
CX25871 Datasheet
Download: CX25871 Datasheet
CX25871
CX25870/871
Video Encoder with Adaptive Flicker Filtering and HDTV Output
Conexant's Cx25870/871 Is Specifically Designed To Meet Tv Out System Requirements For The
Next-generation Desktop Pcs, Notebook Pcs, Game Consoles And Set-top Boxes. With Pin And
Software-forward Compatibility To The Bt868/869, Manufacturers Can Quickly Bring To Market New
Solutions That Support Adaptive Flicker Filtering, Atsc High-definition Television (hdtv) Output,
and resolutions from 320 x 200 (minimum) to 1024 x 768 (maximum).
Adaptive Flicker Filtering Is A Conexant Technology In Which The Encoder Looks At The
Characteristics Of The Video Content On A Pixel-by-pixel Basis And Automatically Determines The
Optimal Amount Of Flicker Filtering Required. If An End-user Wants To Work On A Spreadsheet While
watching a DVD movie in a window, both the text-intensive
Application Requiring A Lot Of Flicker Filtering And The Dvd Movie Requiring Very Little Flicker
Filtering Can Look Their Best. The Amount Of Flicker Filtering And Overscan Compensation Is Entirely
flexible.
The Cx25870/871 Also Provides A 3-wire Analog Rgb Or Yprpb Hdtv Output. While The Encoder Is In Hdtv
Output Mode, The Device Will Automatically Insert Horizontal Tri-level Synchronization Pulses And
Vertical Synchronization Broad Pulses. The Cx25870/871 Is Compliant With The Eia770-3, Smpte
274m/293m/296m Standards And Supports Atsc Hdtv Resolutions Including 480p, 720p, And 1080i.
All Worldwide Standard Definition Outputs Are Supported, Including Ntsc-m (n. America, Taiwan),
Ntsc-j (japan), Pal-b,d,g,h,i (europe, Asia), Pal-m (brazil), Pal-n (uruguay, Paraguay), Pal-nc
(argentina), Pal-60 (china) And Secam. The Cx25870 And Cx25871 Are Functionally Identical, Except
The Cx25871 Can Output Standard Definition Video With Macrovision Level 7.1.l1 Copy Protection
capability.
Functional Block Diagram
24 P[23:0]
Input DEMUX
HSYNC* VSYNC* BLANK*
SIC SID ALTADDR
Timing
Serial Interface
RESET* SLEEP SLAVE
XTALIN XTALOUT
XTAL OSC
Color Space Conversion
Flicker Filter/ Scaler
Internal Reference
Video Encoder
Color Space Conversion
To Internal Clocks
DAC MUX
Clock Generation
10-Bit
BIAS GEN
XTL_BFO
FSADJUST COMP VREF DACA
DACB DACC
DACD VBIAS
CLKO CLKI
Distinguishing
FEATURES
Hdtv Output Mode (patents Pending) - Compliant With Eia770-3 And Smpte274m/293m/296m Standards -
Automatic Tri-level Sync Generation - Component (yprpb) Or Rgb Hdtv Outputs - Direct Yprpb Or Rgb
output from progressive RGB graphics video in 1080i, 720p, 480p ATSC resolutions
Software and register forward-compatibility with the Bt868/869
Ability To Accept Many Different Input Data Formats: - 15/16/24-bit Rgb Multiplexed Or
Nonmultiplexed - 16-bit 4:2:2 And 24-bit 4:4:4 Ycrcb Multiplexed Or Nonmultiplexed - Flexible Pixel
ordering with various alternate formats
Worldwide Video Output Support: Ntsc-m, J, 4.43, Pal-b, D, G, H, I, M, N, Nc, 60, And Secam
Interlaced and noninterlaced outputs
S-Video output (simultaneous with composite NTSC, PAL, or SECAM)
Scart Rgb Or Y/c Output For Europe - 4th Dac Is Composite Video - En50-049 And Iec 933-1 Compliant
5-line Vertical Filtering Scaling For Overscan Compensation And Flicker Reduction
Adaptive Flicker Filtering For Enhanced Image And Peaking Filters For Text Sharpness (patents
pending)
CCIR601/ITU-RBT.601 (i.e., 480i) and CCIR656 compatible input modes
Luma and chroma comb filtering
4 x 10-bit DACs