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Convergence Video Video Encoders/Decoders
Single-Chip Broadcast Audio/Video Decoder
CX25840/1/2/3
Highly Flexible Single-Chip Video and Broadcast Audio Decoding
Conexant's broadband communications portfolio includes a comprehensive suite of semiconductor solutions that enable the digital home and information network. The CX25840/1/2/3 is Conexant's second generation of Audio/Video (A/V) decoders built on the success of the CX23880 family of broadcast A/V PCI decoders. These devices are optimized for the regional broadcast requirements and are pin-to-pin compatible with each other. The CX25840/ 1/2/3 is the smallest integrated stereo broadcast A/V decoder capable of demodulating all of the most common worldwide A/V standards. The CX25840 with no DBX and CX25841 with DBX support both the North American (BTSC) and Japanese (EIA-J) markets, respectively. The CX25842 supports the European market. And finally, for the customer who wants a single chip to address all worldwide broadcast standards, there is the CX25843. This device provides highly integrated, single-chip analog, A/V capture solutions ideal for digital video systems that support worldwide broadcast analog A/V content. Distinguished by its high quality, flexibility, broadcast audio support, integration, and ease of use, the CX25840/1/2/3 can be designed into a wide array of applications, including set-top boxes, flat panel displays, HDTVs, and personal video recorders (PVRs). Highly Integrated The CX25840/1/2/3 is highly integrated, and includes anti-aliasing, noise rejection filters, and Automatic Gain Control (AGC) and DC restore circuits. Along with worldwide decoding for all common video and broadcast audio standards, processing functions such as high-quality four-lines adaptive comb filtering, arbitrary horizontal and 5-tap vertical scaling, hue, brightness, saturation, and contrast controls are also included. 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 CX25840/1/2/3 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. Part Number CX25840/1/2/3 Description Broadcast Audio/Video Decoder
Distinguishing Features
* Auto detection and configuration for audio/video * Worldwide audio standards - BTSC, EIA-J, A2, NICAM, FM/AM * Baseband audio support via I2S and AC 97 * Two 10 bit A/D * Component video support * Integrated anti-alias filter * 12mm X 12mm 80-TQFP * 4H adaptive comb * On-chip voltage regulator
Convergence Video Video Encoders/Decoders
Ease of Use The CX25840/1/2/3 can automatically detect, via the use of an on-chip microprocessor, all the worldwide broadcast video and audio standards. This automatic detection is particularly important in geographic regions where different audio standards may be received on a channel-by-channel basis. The devices are preconfigured in default mode for development, verification, and fast prototyping and thus require minimal programming for startup. Flexible Architecture The CX25840/1/2/3 video inputs can be programmed for up to eight signal inputs - a maximum of eight Composite Video Baseband Signal (CVBS) input channels. Each of these inputs can be used to support CVBS, S-Video, component video, or broadcast audio inputs. The total number and configuration of video and audio inputs is user defined.
With eight programmable input ports and configurable output ports for 4:2:2 digital video and linear PCM audio, the CX25840/ 1/2/3 can be used to capture video and audio from TV tuners, DVD players, video cameras, VCRs, game consoles, or any other source of composite Y/C or component (480i) video. Baseband Audio Support Output flexibility is not limited to video. The CX25840/1/2/3 offers complete support for baseband audio. The audio output can be programmed to support interfaces of I2S, VIP or audio , over ancillary in the 656 video modes. Additionally, the I2S CLK can act as a master or slave. The serial audio interface supports programmable master/slave modes and 16- to 24-bit sample widths. The serial audio input port can supply audio samples from an external, baseband audio codec at 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz.
XTI XTO
Master Clock Input
VBI Data Slicer and Decoder PIXCLK Arbitrary Horizontal and Vertical Multi-tap Polyphase Scaler Video Output Port: BT.656, BT.601, VIP 2.0 I/O Pin MUX VID_DATA[7:0] VRESET/PRGM3 HRESET/PRGM2 FIELD/PRGM1 DVALID/PRGM0 IR_RX/PRGM5 IR_TX/PRGM6 GPIO1/PRGM9 GPIO0/PRGM8 SER_CLK/HAD[0] SER_DATA/HAD[1] CHIP_SEL/VIPCLK HCTL/PRGM3 IRQ_N/PRGM4
CVBS1/Y1 Input MUX, Anti-alias Filter and AGC CVBS2/Y2 CVBS3/Y3 10-Bit CVBS/ LUMA ADC
CVBS4/Y4/SIF1/Pb CVBS5/C1/SIF2/Pb CVBS6/C2/SIF3/Pb CVBS7/C3/SIF4/Pr CVBS8/C4/SIF5/Pr
Video Decoder NTSC, PAL, SECAM with 4H Adaptive Comb Filter Broadcast Audio Decoder BTSC, SAP, EIAJ, A2, NICAM, FM, AM
10-Bit Chroma/ Sound IF ADC
Stereo Audio Processing Tone, Volume, Balance
BCLK_IN WCLK_IN SDIN
Serial Audio In 32, 44.1, 48, 96 kHz 16 - 24 Bit Samples Master or Slave
Stereo Audio Processing Tone, Volume, Balance
Stereo Audio Out 32, 44.1, 48, 96 kHz 16 - 24 Bit Samples Master or Slave
2-Wire Serial Command or VIP Host I/F Audio Over Sample or Generic Clock
PLL_CLK/PRGM7
BCLK_OUT
SDOUT
WCLK_OUT
CX25840/1/2/3 System Block Diagram
Part Ordering Numbers
Part Number Worldwide Audio Decoding A2, NICAM, FM, AM, Audio Decoding BTSC (with DBX), EIA-J Audio Decoding BTSC (without DBX), EIA-J Audio Decoding Component Video Input VIP Host Port
CX25840 CX25841 CX25842 CX25843 X X X
X
X X X X
X X X X
CX25843, CX25842, CX25841, and CX25840 Pinout
Convergence Video Video Encoders/Decoders
CX2584X
Video Decoder CVBS Tuner VIF SIF Stereo A/D Left+Right Ch Broadcast Audio Decoder CCIR 656 MPEG Video Decoder CVBS
I2S
L, R Stereo
I2S
CX25840/1/2/3 Diagram
CX25840/1/2/3 Features
* Auto detection and configuration of worldwide broadcast A/V standards * Worldwide video standards - NTSC (M, J, 4.43), PAL (B, D, G, H, I, M, N, Nc), SECAM (K, L) * Worldwide audio standards - BTSC, EIA-J, A2, NICAM, FM/AM * Full 2 10-Bit ADCs and data path * Flexible video input mux with integrated anti-alias filtering * Four line adaptive comb filter for NTSC and PAL * Flexible video output port - 27 MHz ITU-R BT.656, VIP 2, or ITU-R BT.601 video with separate syncs * Macrovision detection * Programmable VBI data slicer for data services such as closed caption, Teletext, and program guides * Power-up configurable two wire serial command interface or two wire VIP 1.1/2 host port interface * Multiple audio outputs - serial audio interface I2S or AC97 or embedded as ancillary data in the video stream * Flexible sample rate conversion on all audio inputs and outputs
(c) 2003, 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
* Hardware interrupt to eliminate polling * Fast locking mode for security camera applications * Auxiliary clock output - For providing an over sample audio clock locked to the video or for use as a general purpose PLL output * Infrared transmit and receive logic * Internal voltage regulation for single supply operation * Low power * 80-pin TQFP Typical Applications * Flat panel displays * HDTV * TV tuners * DVD players * Video cameras * Set-top boxes * VCRs and PVRs * Game consoles
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
Conexant shall not be liable for any
www.conexant.com General Information: U.S. and Canada: (888) 855-4562 International: (732) 345-7500 Headquarters 4000 MacArthur Blvd. Newport Beach, CA 92660 Order# 102205A
special, indirect, incidental or consequential damages as a result of its use.
03-0859

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