Conexant’s product portfolio of multimedia ICs provide the finest combination of features, video performance, flexibility, size and value for today’s Set Top Box, PC Video, DVD playback, Digital Photography and other video systems. Key features such as 10-bit current output DACs, worldwide video standards support, interfaces with common bus architectures and compact packages provide the ultimate combination of video performance, quality, ease of design and overall value.

Fusion™ 878A PCI Video Decoder

	Bt878A Application Brief
	Customising PCI Decoder Drivers for Different Tuners
	Implementing Tuner Arbitration Application Note
	WDM Application Note
	Bt878A Data Sheet
	Bt878A Errata
	Bt878A Product Brief
	DStream™ ATSC Reference Design
	DStream™ DBS Reference Design
	Extra data and application notes

The Fusion 878A is a complete, low cost, single-chip solution for analogue broadcast signal capture on the PCI Bus. The Fusion 878A takes advantage of the PCI-based system's high bandwidth and inherent multimedia capability. It is designed to be interoperable with any other PCI multimedia device at the component or board level.

The Fusion 878A has all the video and audio capture features of the Bt878, plus a whole lot more. Designed to address the demanding requirements of the Personal Computing and digital video industry, Fusion 878A meets PC98/PC99 requirements as well as being fully PCI 2.2 compliant. Fusion 878A addresses the current analogue PC TV requirements since it is pin compatible and software compatible with the current Bt878. Fusion 878A can also be used in an array of MPEG digital transport stream products as well. The world is turning digital, with new standards in Television - ATSC and COFDM - and Television recording technologies using MPEG compression. Fusion 878A can be used as the hub into the PC connecting the multiple analogue and digital video formats in the PC via a single PCI connection.

	EVALUATION REFERENCE BOARD The Bt878A Evaluation Board is available for purchase supporting three versions, NTSC, PAL-I and PAL-BG which simply reflects the type of TV tuner fitted to the card i.e. allows the user to capture or display live video and TV on the PC). A UK customer would probably require the PAL-I version.

Features
NTSC/PAL/SECAM video decoding
Supports capture resolutions up to 768 x 576 (full PAL)
On-chip PCI bus mastering and bridge functionality
Supports HDTV/audio/MPEG2 transport data across PCI bus
High-speed serial port support MPEG transport stream up to 20 Mbps
Flexible 24 bit wide GPIO
CCIR656 interface
Interfaces to a Digital TV data stream from a VSB or OFDM demodulator
Multiple YcrCb and RGB pixel formats and YUV planar formats supported on   output
Selectable pixel density: 8, 16, 24 and 32 bits per pixel
Performs complex clipping or videos source and VGA video overlay
Permits different program control and colour space/scaling for even and odd
   fields.
Executes Windows 98 'Scatter and Gather '
Integrates advanced chroma and luma comb filters/scalers
Image scalable in X and Y direction
Y/C, 6-tap luma/2-tap chroma polyphase filter
Received Digital audio via 21S serial port Includes VBI data capture (closed
   captioning, teletext, and I intercast data decoding)
100% PCI Rev.2.2 complaint
PC98/PC 99 complaint
WHQL-certificate
Accepts Mono audio input
Packaged in compact 128-pin plastic QFP

Fusion 878A Specific Features
Full stereo decoding for both TV audio (BTSC) and FM radio
Enhanced GPIO/I2S
ACPI support
Byte Alignment
Vital products data
High Speed Serial port
High Speed parallel port

CX23880/CX23881 PCI Audio/Video Broadcast Decoder

	CX23880/CX23881 Product Brief
	CX23880/1/2/3 Product Bulletin
	Extra data and application notes

Single-Chip Solution Allows TV, Radio, Digital TV and Broadband Data Capture Over the PCI Bus
This single-chip solution enables the host PC to perform audio/video capture, video display, audio playback, or storage and playback at a later time through software or hardware audio/video codecs.

The CX23880/CX23881 is fully compatible with Conexant’s family of digital channel demodulators for capture of (HDTV) High Definition Television and Standard Definition Television (SDTV) streams, as well as broadband data over terrestrial, satellite or cable links. The CX23880 interfaces directly to the CX23490 HDTV hardware decoder for offloading the CPU of high-level MPEG-2 decoding tasks.

A variety of third-party peripheral connectivity options are supported by the CX23880/CX23881. Its General Purpose Input/Output pins and CPU host port interface enable vendor-specific board functionality and marketplace differentiation.

CX23880 Overview
The CX23880 is designed to offer global support for all analogue video broadcast standards in addition to digital broadcasts via an external channel demodulator. It is also designed to offload the CPU of decoding tasks for High Level MPEG-2 (HDTV), 4:2:2 de-interlacing and progressive-scan DVD via a dedicated ViP 2 Host Port interface to the CX23490 high-level MPEG-2 Decoder.

CX23881 Overview
The CX23881 is a 100% pin-compatible and software-compatible subset of the CX23880. It is particularly suited to the European marketplace and therefore does not support BTSC-dBX and EIAJ audio as broadcast in the U.S. and Japan. In addition, the ViP host port is not supported on the CX23881 as there is no requirement for supporting high-level MPEG-2 decoding for digital television applications.

Main level MPEG-2 decoding for DVB broadcast applications is supported via a dedicated MPEG port for streaming of compressed data streams to the host for software-based decompression.

Both the CX23880 and CX23881 support a general purpose host port for connection to external CODECs for compression of analogue video/audio broadcasts that can be stored on the host’s hard disk or played back in software.

Analogue Video Capture Overview
The CX23880/CX23881 integrates a 10-bit NTSC/ PAL/SECAM composite and s-video decoder, image resizer/scaler, Direct Memory Access (DMA) controller and Peripheral Component Interface (PCI) bus master on a single device. The CX23880/CX23881 can place video data directly into host memory for video capture applications and into a target video display frame buffer for video overlay applications.

Features
Video Subsystem
10-bit video A/D
Global video standards support [NTSC (M, J, 4.43), PAL (B, D, G, H, I, M, N,  N-combination), SECAM (K, L)]
Capture resolution up to 768 x 576 (square pixel PAL/SECAM)
NTSC and PAL adaptive comb-filter for 2-D Y/C luminance and chrominance
  separation
AGC video circuit
Multiple YCrCb and RGB pixel formats and YUV planar formats supported on
  output
Selectable pixel density: 8, 16, 24 and 32-bits per pixel
Performs complex clipping of video source and VGA video overlay
Permits different program control and colour space/scaling for even and odd
  fields
Supports Windows ® “Scatter/Gather” DMA
High-quality multi-tap horizontal and vertical image scaler for decoded video or   4:2:2 sources
ITU-R BT.656 8-bit or 10-bit 4:2:2 output port for MPEG-2 encoder connection
ITU-R BT.656/VIP 2.0 pixel input port for MPEG-2 ML or HL decoder
  connection
Flexible VBI data capture for closed captioning, teletext, other analogue    broadcast data types
Hue, brightness, contrast, saturation control for video decoder

Audio Subsystem
Low IF sampling direct from tuner
CX23880: Global broadcast audio support (BTSC-DBX, NICAM, A2, EIAJ, FM)
CX23881: European broadcast audio support (NICAM, A2, FM)
Decoded 48 KHz audio stream to PCI bus for real-time encoding to MP3
Integrated 90 dB SNR stereo audio DACs to drive sound card or headphones
I2S Input port for external source connectivity to on-board stereo DACs
I2S Output port to drive coaxial/optical digital audio interface
Flexible audio sample rate converter

Multipurpose I/O Subsystem
Bi-directional 33 Mbps VIP 2.0 host port. Compatible with the CX23490
  all-format MPEG-2 decoder (CX23880 only)
Bi-directional 10 Mbps Intel/Motorola-compatible general purpose host port
Unidirectional 10 Mbps parallel/serial MPEG transport/data stream port. Compatible with all Conexant digital television channel demodulator ICs
MPEG packet synchronisation
User-defined general purpose input/output pins

PCI Subsystem
5 independent functions each with target/master and local register space   (video, audio, MPEG port, VIP 2.0 host port, GP host port)
All RISC/control programs executed on chip
On-chip SRAM for PCI data buffering up/down
Vital product data
DMA byte alignment
PCI revision 2.2 compliant

Miscellaneous
ACPI and power-down support
Requires only one crystal for all video and audio decoding
400 KHz serial bus master
JTAG boundary scan interface
Compact 176-pin TQFP
Low power

Bt829A/Bt827A VideoStream II™ Decoders

	Bt829A/Bt827A VideoStream II Decoders
	Bt829A Errata Sheet
	Bt829A/Bt827A Errata Sheet

The Bt829A and Bt827A VideoStream Decoders are a family of single-chip, pin- and register-compatible, composite NTSC/PAL/SECAM video and S-Video decoders. They are also pin and register backward compatible with the Bt829/Bt827 family of products. Low operating power consumption and power-down capability make them ideal low-cost solutions for PC video capture applications on both desktop and portable system platforms. They support square pixel and CCIR601 resolutions for NTSC, PAL and SECAM video. They have a flexible pixel port which supports a variety of system interface configurations, and they are offered in 100-pin PQFP and 100-pin TQFP packages.

Please refer to Bt829B and Bt835.

• Single-chip composite/S-Video NTSC/PAL/SECAM to YCrCb digitiser
• On-chip Ultralock
• Square pixel and CCIR601 resolution for NTSC (M), NTSC (M) without 7.5IRE pedestal, PAL (B, D, G, H, I, M, N, N combination), and SECAM

Bt829B VideoStream™ Decoder

	Bt829B Data Sheet
	Bt829B/Bt827B
	Bt829B/Bt827B
	Bt829B/Bt827B
	Bt829B/Bt827B

The Bt829B VideoStream™ Decoder are a family of single-chip, pin-and register-compatible, composite NTSC/PAL/ SECAM video and S-Video decoders. It is also pin and register backward compatible with the Bt829A/827A family of products. Low operating power consumption and power-down capability make them ideal low-cost solutions for PC video capture applications on both desktop and portable system platforms with a 3.3 V digital I/O interface. It supports square pixel and CCIR601 resolutions for NTSC, PAL, and SECAM video. They have a flexible pixel port which supports a variety of system interface configurations, and they are offered in a 100-pin Plastic Quad Flat Pack (PQFP).

Features
Single-chip composite/S-Video NTSC/PAL/ SECAM to YCrCb digitiser
On-chip Ultralock
Square Pixel and CCIR601 Resolution for:
   - NTSC (M)
   - NTSC (M) without 7.5IRE pedestal
   - PAL (B, D, G, H, I, M, N, N combination)
   - SECAM
Chroma comb filter
Arbitrary horizontal and 5-tap vertical filtered scaling
Hardware closed-caption decoder
Vertical Blanking Interval (VBI) data pass-through
Arbitrary temporal decimation for a reduced frame-rate video sequence
Programmable hue, brightness, saturation, and contrast
User-programmable cropping of the video window
2x oversampling to simplify external analogue filtering
Two-wire Inter-Integrated Circuit (I2C) bus interface
8- or 16-bit pixel interface
YCrCb (4:2:2) output format
Software selectable four-input analogue MUX
4 fully programmable GPIO bits
Auto NTSC/PAL format detect
Automatic Gain Control (AGC)
   3.3 V I/O
Typical power consumption 0.85 W
IEEE 1149.1 Joint Test Action Group (JTAG) interface
100-pin PQFP
Related Products: Bt829A, Bt856/857, Bt864A/865A, Bt864/865, Bt852

Applications
Multimedia
Image processing
Desktop video
Video phone
Teleconferencing
Interactive video

Bt835 Digital Video Decoder

	Bt835 Phase Locked Loop
	Bt835 VideoStream™III DecoderData Sheet
	Bt835
	Bt835
	Bt835
	25835-12 and 25835-13 Obsolescence Notice
	Bt835 Digital Video Decoder Product Brief

Integrated VideoStream III Video Capture Processor for TV/VCR Analogue Input and VBI Data Decoding
Conexant’s Bt835 video capture processor is a single-chip decoding and filtered scaling solution for analogue NTSC/PAL/SECAM baseband signals from TV tuners, VCRs, cameras, and other sources of composite or Y/C video. The Bt835 is the first video capture solution for low-cost PC video/graphics systems to deliver total integration of the video digitisation, synchronisation, 2H adaptive Y/C separation, scaling and VBI data passthrough functions. Using mixed signal and DSP circuitry, the Bt835 converts an analogue composite video waveform into a scaled digital video stream while supporting a variety of video formats, resolutions and frame rates.

Optimised for PC Video Capture
The Bt835 provides the most cost-effective, high-quality video input solution for low-cost PC multimedia subsystems, which integrate both graphics acceleration and video capabilities on one add-in card or the PC motherboard itself.

The Bt835 minimises the cost of the video capture function integration in a number of ways. First, recognising that YCrCb to RGB colour space conversion is now a standard feature of multimedia controllers for acceleration of digital video playback, the Bt835 avoids redundant functionality and allows the downstream controller to perform this task.

	Interlaced Mode on Bt835 The Bt835 supports interlaced modes only. It acceps analogue video in PAL, NTSC or SECAM formats and converts this to a digital output in 4:4:2 YCrCb format (including CCIR 656). It also has a digital video input port to enable digital video pass-through and use of the Bt835's internal scaling processor to resize the digital video data.

Ultralock™
Employing a Conexant patented Ultralock technique, the Bt835 achieves both horizontal and subcarrier synchronisation to the incoming analogue video signal. It will always generate the required number of pixels per line from an analogue source in which the line length can vary by as much as a few microseconds. Ultralock‘s digital locking circuitry enables the Bt835 to quickly and accurately lock on to video signals, regardless of their source.

Since the technique is completely digital, Ultralock can recognise unstable signals caused by VCR headswitches or any other deviation and adapt the locking mechanism to accommodate the source. Ultralock uses non-linear techniques that are difficult, if not impossible, to implement in genlock systems. Unlike linear techniques, it adapts the locking mechanism automatically. This removes the requirement to reset the locking range of the genlock circuit, which other video decoding technologies impose to accommodate the type of source being used in a particular system setup.

Digital Video Output Interface
The output pixel port of the Bt835 can be configured in a variety of flexible formats to support many different system implementations.The video pixels are delivered as a continuous video stream running at a 4x Fsc rate which is synchronous to the ADC sample clock. Both YCrCb and YUV 4:2:2 pixels can be provided over an 8- or 16-bit data bus.Three clock signals are provided for the system interface: CLK x 1 and CLK x 2, which operate at 4x Fsc and 8x Fsc respectively; and QCLK, which can be configured to be a pixel load clock for a downstream video controller. Both data and clock operate at 2x the video pixel rate when the pixel port is configured in an 8-bit-wide mode. The Bt835 also has the capability of embedding the video control signals in the digital pixel stream in either ViP mode or ByteStream mode.

The video field/frame synchronisation signals and others are coded into the pixel data stream using out-of-range luminance and chrominance data values. This feature eliminates the requirement for the downstream video controller to allocate pins to receive video control signals from the Bt835.

The Bt835 features a digital video input interface where any digital video stream from sources such as a MPEG-II decoder or a digital camera with 8-bit YCrCb outputs can take advantage of the Bt835’s sophisticated video scaler and colour control circuitry. CCIR656 inputs and 8-bitYCrCb data with external syncs are supported.

VBI Data Capture
The Bt835 provides a complete solution for capturing and decoding Vertical Blanking Interval (VBI) data by operating in a VBI line output mode, in which the VBI data is only captured during select lines. This mode of operation enables the concurrent capturing of VBI lines which contain ancillary data and the processing of normal video image data. In addition, the Bt835 supports a VBI frame output mode, in which every line in the video frame is treated as if it were VBI line data. This mode of operation is designed for use with still frame capture/processing applications.

Scaling
The Bt835 integrates a high-quality comprehensive scaler for image downsizing. The scaling factor is selectable to be arbitrary and independent in X and Y dimensions with minimum scaling factors of 0.071 in X and Y. This enables full-resolution video to be reduced to any size down to icon resolution. The video can be optionally band-limited using a digital low-pass filter prior to scaling to minimise aliasing artifacts induced by the scaling process. Horizontal scaling is implemented through a six-tap 32-phase interpolation filter. Vertical scaling is performed with a multi-tap eight-phase interpolation filter. In addition to scaling, the video image may be cropped to an arbitrarily sized window.

Y/C Separation
Y/C separation involves extracting the luminance (Y) and the chrominance (C) components from the composite information. This is followed by quadrature demodulation to generate the baseband components (I and Q for NTSC or U and V for PAL) from the chrominance signal. The Bt835 implements an adaptive 2H comb filter to separate the chrominance from the luminance while maintaining full vertical resolution and eliminating“hanging dots” for the best possible NTSC Y/C separation. For PAL/SECAM video, the Bt835 uses a notch/chroma comb filter. The Bt835 also provides hue, saturation, brightness and contrast controls — providing end users with the flexibility to adjust the decoded image‘s appearance.

Host Interface
Bt835 register access is implemented using I2C, which is a serial two-wire interface (one data pin and one clock pin). The Bt835 behaves as an I2C slave with a data transfer rate of 100 Kbps.

Features
Single-chip composite/S-video NTSC/PAL/SECAM to YCrCb digitiser
On-chip Ultralock™
Square pixel and CCIR601 resolution for NTSC, PAL (B, D, G, H, I , M, N, N
   combination, OO) and SECAM
2H adaptive comb filtering (NTSC)
Single crystal for all video formats
High quality horizontal and vertical filtered scaling
Closed caption decoding
Vertical blanking interval data passthrough
Programmable temporal decimation for a reduced frame-rate video sequence
Programmable hue, brightness, saturation, and contrast
8x Fsc sampling to simplify external analogue filtering
Two-wire I2C bus interface
8- or 16-bit pixel interface
YCrCb (4:2:2) output format
Software selectable four-input analogue mux
8 fully programmable GPIO pins
Auto NTSC/PAL format detect
Automatic gain control
User programmable peaking filter
3.3V I/0 mode
IEEE 1149.1 (JTAG) interface
100-pin PQFP package

Applications
Multimedia
Image processing
Desktop video
Video phone
Personal video conferencing
Interactive video

Bt812 NTSC/PAL to RGB/YCrCb Decoder

Bt812 Decoder Data Sheet
Last-time-buy information

The Bt812 Image Digitiser converts NTSC and PAL composite or Y/C analog video signals to either digital RGB or YCrCb video data at pixel rates from 8-15 MHz. This digitizer supports 24-bit RGB, 16-bit RGB, 15-bit RGB, 4:4:4 24-bit YCrCb, or 4:2:2 16-bit YCrCb output formats.

• Ability to Digitize Composite or Y/C (NTSC or PAL)
• Flexible Video Resolutions up to 15 MSPS
• On-Chip Ultralock
• Programmable Hue, Brightness, Contrast, and Saturation
• Supports 2X Clock Operation
• RGB or YCrCb Output Formats
• 0.7-2 V Video Input Signals
• Standard MPU Interface
• 160-pin PQFP Package
• JTAG Support