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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.

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
TEST RESET_N SLEEP GPIO[1]/PRGM9 VSS VDD GPIO[0]/PRGM8 IR_TX/PRGM6 IR_RX/PRGM5 IRQ_N/PRGM4 VDDO VSSO VSS VDD SER_DATA/HAD[1] SER_CLK/HAD[0] CHIP_SEL_VIPCLK VRESET/HCTL/PRGM3 VSS VDD
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
VDD VSS VSSO VDDO VAA_XTAL XTO XTI VSS_XTAL VSS_CH2 CVBS8/C4/SIF5/Pr2 VAA_CH2 CVBS7/C3/SIF4/Pr1 S2D_NEG2 CVBS6/C2/SIF3 IREF CVBS5/C1/SIF2/Pb2 VSS_CH1 CVBS4/Y4/SIF1/Pb1 VAA_CH1 CVBS3/Y3
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
80-Pin TQFP 12 x 12 x 1 mm Body Size 0.5 mm Pin Pitch
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
CVBS2/Y2 S2D_NEG1 CVBS1/Y1 ASUB VAA_ADC1 VSS_ADC1 VSS_ADC2 VAA_ADC2 REG_OUT REG_IN VSS_PLL VPP0 VPP1 VDDO_PLL PLL_CLK/PRGM7 VSSO_PLL SA_SDIN SA_BCLK_IN SA_WCLK_IN SA_BCLK_OUT
CX25843, CX25842, CX25841, and CX25840 Pinout
HRESET/PRGM2 FIELD/PGRM1 DVALID/PRGM0 VID_DATA[7] VID_DATA[6] VID_DATA[5] VID_DATA[4] VDDO VSSO VSS VDD VID_DATA[3] VID_DATA[2] VID_DATA[1] VID_DATA[0] PIXCLK VSS VDD SA_SDOUT SA_WCLK_OUT
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Convergence Video Video Encoders/Decoders

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.
www.conexant.com General Information: U.S. and Canada: (800) 854-8099 International: (949) 483-6996 Headquarters - Newport Beach 4000 MacArthur Blvd, P Box C .O. Newport Beach, CA 92660-3095 Order# 102205A
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
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