Video
PCI Express Video Decoders
PCI Express Broadcast Audio/Video
Decoder
CX23885
Conexant’s portfolio includes a comprehensive suite of semiconductor
solutions for communications and consumer applications.
•
The CX23885 family device brings Conexant’s long heritage of audio and video
capture solutions to systems that enable PCI Express™ bus architectures. The
device integrates all the functions required to perform television and external
A/V capture on personal computers or consumer electronic devices.
The integrated worldwide video decoder and audio decoder can be used for
a high-performance, cost-effective, basic analog television capture, or can be
used as the base for more complex multiple tuner configurations. The device
can support capture of two simultaneous digital television transport streams,
or a combination of analog and digital capture. The device can be used in
conjunction with Conexant’s tuners and demodulators to create hybrid tuner
cards that support ATSC, DVB-S, DVB-S2, and DVB-T content.
The device is packaged in a 14x14 mm, lead-free, 128-pin Exposed Thin Quad
Flat Pack (ETQFP).
Highly Integrated
This latest generation of devices integrates anti-aliasing, noise rejection filters,
and Automatic Gain Control (AGC). Quality video is accomplished by using
10-bit video Analog-to-Digital Converters (ADCs), a full 10-bit video data path,
a two dimensional adaptive comb filter for NTSC and PAL video for improved
image quality, horizontal and five-tap vertical scaling, and hue, brightness,
saturation, and contrast controls.
For high-quality audio, Conexant provides ADCs for stereo audio capture. A
minimum of 16-bit audio resolution through the entire audio data path ensures
high-fidelity audio, whether it comes from the integrated broadcast audio decoder,
the sigma-delta ADCs, or an external serial audio source. The audio path includes
an automatic volume control function and two assignable stereo processing units
for control of volume, three-band equalization, and balance. The level of audio
and video integration provided by the CX23885 removes the need for additional
broadcast audio decoding and processing chips or external sound demodulation
chips. It also reduces the overall Bill of Materials (BOM) for the system developer,
without compromising audio and video performance. To enable faster time
to market, Conexant offers multiple CX23885 PCI Express and ExpressCard
reference designs. All of the reference designs include schematics, layout files,
and evaluation boards with production-ready device drivers.
Conexant’s fourth-generation device represents another landmark in the
company’s video innovation timeline. Additional pioneering developments
include creating the PCI video decoder category. The company also introduced
the industry’s first single-chip MPEG audio/video codec, delivered the world’s
most widely deployed MPEG audio/video encoder, and launched the first
single-chip video encoder and digital video interface (DVI) transmitter.
Distinguishing Features
• PCI Express 1.0a compliant
• Worldwide audio and video decoding
• Automatic video and broadcast audio
standard detection and configuration
• Flexible video input MUX supporting
composite, S-Video, and component
inputs with integrated anti-alias filtering
• Integrated sigma-delta stereo audio
ADCs with 4:2 MUX
• Audio sample-rate converters on all
inputs and outputs
• Two MPEG transport stream ports—
serial or parallel interfaces
• Support for the following audio
formats: Stereo, mono, dual language
(mono), tri language (Trivox)
Part Number CX23885
Description
PCI Express Broadcast Audio/Video Decoder
Video
PCI Express Video Decoders
Features
• Two I2C master ports (two ports are required for a
two-tuner design to isolate I2C transactions to reduce noise)
• PCI Express 1.0a compliant
• Worldwide audio and video decoding
• Macrovision 1.0 detection compliant
• Automatic video and broadcast audio standard detection
and configuration
• Flexible video input MUX supporting composite, S-Video,
and component inputs with integrated anti-alias filtering
• Programmable Vertical Blanking Interval (VBI) data slicer for data services such as closed caption, Wide Screen Signaling (WSS), Gemstar 1x and 2x, and program guides
• Integrated sigma-delta stereo audio ADCs with 4:2 MUX
• Infrared transmitter and receiver logic
• Audio sample-rate converters on all inputs and outputs
• High-quality multi-tap horizontal and vertical image scaler
for decoded video or 4:2:2 sources
• Two MPEG transport stream ports — serial or
parallel interfaces
• ITU-R BT.656 input port
• Support for the following audio formats: stereo, mono,
dual language (mono), tri language (Trivox)
• ITU-R BT.656 output port
• I2S in (line-in audio)
• Two program stream inputs — serial or parallel interfaces
• I2S out
• Auxiliary Phase Locked Loop (PLL) clock for general use
3 CVBS
or
Luma
Inputs
3 CVBS,
Luma,
Chroma,
SIF, or
Pb Inputs
2 CVBS,
Luma,
Chroma,
SIF, or
Pr Inputs
L/R 1
Audio In
L/R 2
Audio In
2
3
Clock, Data,
Start, Valid
Clock, Data[7:0],
Start, Valid
Clock, Data,
Start, Valid
Serial TS/PS Input
Port or BT.656/VIP1.1
Input or Output
Parallel TS/PS Input
Port or BT.656/VIP1.1
Input or Output
Serial TS/PS
Input Port
ColorSpace
Converter and
Formatter
Analog
Front End
CH 2
Analog
Front End
CH 3
Video
Decoder
NTSC/PAL/
SECAM
10-Bit
Video
ADC
Analog
Front End
CH 1
10-Bit
Video/SIF
ADC
18-Bit
Audio
ADCs
Audio
Decoder
BTSC/EIAJ/
A2/NICAM/
AM
GPIO
UART
GPIO x24
RS 232
Baseband
Audio
Vol/Tone/
Balance/Mute
Color Space
Converter
and
Formatter
I2C Master 1
SCL{1}
SDA{1}
I2C Master 2
SCL{2}
SDA{2}
RISC Engine
and
DMA Controller
PCI
Express
SRAM Butters
TL
DLL
MAC
x1
PCI
Express
PHY
L/F
System
PLL
Aux/Audio
PLL
Serial Audio
In/Out
Crystal
Amplifier
Video
PLL
16 to 24-Bit
32, 44.1, 48.
96 kHz
Single Crystal
Frequency
x1
PCI
Express
Audio
Master
Clock
CX23885 Block Diagram
Conexant Product Portfolio
The company’s broad portfolio of semiconductor products also includes client-side DSL, cable, and dial-up modem solutions; fiber optic system-onchips; broadcast video encoders and decoders; digital set-top box components and systems solutions; and IEEE 802.11a/b/g/n-compliant WLAN
chipsets. Additional products include a complete line of asymmetric and symmetric DSL central office solutions, which are used by service providers
worldwide to deliver broadband data, voice, and video over copper telephone lines.
© 2007, Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant
logo are registered trademarks of Conexant Systems, Inc. All other trademarks
are owned by their respective owners. Although Conexant strives for accuracy
in all its publications, this material may contain errors or omissions and is
subject to change without notice.
This material is provided AS IS and without
any express or implied warranties, including merchantability, fitness for a
particular purpose and non-infringement.
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
07-2676
www.conexant.com
General Information:
U.S. and Canada: (888) 855-4562
International: (732) 345-7500
Headquarters
4000 MacArthur Blvd.
Newport Beach, CA 92660
Doc# PBR-200865