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Convergence Video Video Encoders/Decoders
Single-Chip Video Decoder
CX25836/7
High Performance in a Small Package
Conexant's broadband communications portfolio includes a comprehensive suite of semiconductor solutions that enable the digital home and information network. The CX25836/7 is Conexant's fourth-generation video decoding solution. It provides a highly integrated single-chip analog video capture solution ideal for a wide range of digital video systems applications. The CX25836/7 features, although applicable to a wide range of analog video applications, are focused on both the security and consumer electronics markets. Most notably, CX25836's fast camera locking capabilities and flexible programmable inputs make it most suitable for the security camera market. The CX25837 with its ability to decode Composite Video Baseband Signal , (CVBS), S-Video, and YPbPr, is best suited to address the wide array of consumer electronics requirements. Both devices are distinguished by high quality, flexibility, integration, and ease of use. Both fit into a wide array of applications: set-top-boxes, flat panel displays (such as LCD and Plasma TVs), HDTVs, and PVRs/DVRs. High Quality The CX25836/7 integrates two high-performance 10-bit ADCs and provides a full 10-bit data path through the video decoder to maintain optimum end-toend video quality. Eight video inputs provide flexible analog muxing that can be configured for any of the following: * Eight CVBS inputs * Four Y/C inputs * Three composite with one Y/C and one YPbPr * One composite with two Y/C and one YPbPr * Two composite with two YPbPr (CX25837 only) The CX25837 uses its high quality Analog-to-Digital Converter (ADC) to sample the YPbPr video format, which is most often found on prosumer (intermediate to advanced end user) type equipment. Simultaneous digitization of Pb and Pr, through the 10-bit chrominance A/D, is used to offer this feature cost effectively yet yield the highest quality. Part Number CX25836/7 Description Single-Chip Video Decoder
Distinguishing Features
* Integrated NTSC/PAL/SECAM video decoding * Auto detection and configuration for video * Two 10 bit A/D * YPbPr component video input * Ease of Use * 12mm X 12mm 80-pin TQFP * 7mm X 7mm 64-pin TQFP * CCIR 656/601/VIP * Integrated anti-alias filter * On-chip voltage regulator
Convergence Video Video Encoders/Decoders
Integrated Filters All video inputs have integrated anti-alias filters, eliminating the need for external filter components. These filters help improve the video decoding process by removing aliasing artifacts prior to the digitization process. Conexant also employs a proprietary method of luma/chroma separation of the composite video sources. Conceptually similar to a 4H adaptive chrominance comb filter used for NTSC and PAL, Conexant performs a slight twist to provide unparalleled performance. Through the use of adaptive correlation logic, the resulting combed image provides improved performance over a standard 4H comb solution. In the case where no correlation exists between lines, the decoder automatically falls back to the chrominance band-pass and luma notch filter. In the case of SECAM, a bell filter is implemented. The net effect of the various filtering stages results in a high-quality image with reduced cross-chrominance and cross-luminance artifacts (such as dot crawl, hanging dots, rainbow effects) and thus restores full bandwidth to luminance data from composite sources.
Flexible Architecture With eight programmable input ports and a configurable output port for 4:2:2 digital, the CX25836/7 can be used to capture video from TV tuners, DVD players, video cameras, VCRs, game consoles, or any other sources of composite Y/C or component (480i) video. The CX25836/7 video inputs can be programmed for up to eight video sources; a maximum of eight CVBS input channels. Each of these inputs can be used to support CVBS, S-Video, or component video inputs. The total number and configuration of video inputs is user-defined. Ease of Use The CX25836/7 requires minimal programming for startup. These devices are preconfigured in a default mode for development, verification, and fast prototyping. Additionally, the CX25836/7 can auto detect all worldwide broadcast video standards. Internally, the CX25836/7 uses on-chip logic to determine which video standard is present and reconfigures automatically so no user intervention is necessary. This is especially useful in geographic regions where different video standards may be received on a channel-by-channel basis. However, like the operation of traditional video decoders where the user chooses a specific video standard, the automatic detection feature may be turned off.

CX25836/7 System Block Diagram
Superior Performance The CX25836/7 high quality video decoder offers superior performance through advances in technology, integration, and patented intellectual property. For example, a new and improved arbitrary horizontal and vertical scaler, from full resolution down to an 8:1 ratio (icon size), has been implemented using a polyphase interpolation filter. This maintains a high-quality scaled image that preserves the detail and aspect ratio of the source material. Scaling can be accomplished in both ITU-R BT.656 and square formats. Additionally, new advances in clamping, Automatic Gain Control (AGC), and DC restore circuitry allow for faster lock times upon channel change and improved signal reconstruction abilities to improve the video decode process. The CX25836/7 is offered in a compact 64-pin 7x7 mm TQFP and operates off of a single 3.3 V regulator.
Moreover, the surrounding Bill of Materials (BOM) has been integrated and optimized for performance and overall cost effectiveness. Together, small package and integration yield high performance in a small package. To maximize the customer's flexibility and minimize the board space by eliminating multiple foot print options, the CX25837 is also offered in an 80-pin 12x12 mm device, which is pin-for-pin compatible with the CX25840/1/2/3 broadcast A/V decoder. Broadcast audio can be added by a mere device change. Finally, the CX25836/7 has multiple power-down modes to address low-power applications and power budget-sensitive designs. The video decoder is designed on the latest sub-micron process, which reduces the overall power consumption through the advantages of reduced geometries.
Part Ordering Numbers
Part Number 6 Video Input Mux 8 Video Input Mux Component Video Input VIP Host Port
CX25836 CX25837 X
X X X
CVBS5/C1/SIF2/Pb2
CVBS4/Y4/SIF1/Pb1
CVBS8/C4/SIF5/Pr2
CVBS7/C3/SIF4/Pr1
CVBS6/C2/SIF3
VAA_XTAL
S2D_NEG2
VSS_XTAL
CVBS3/Y3
VAA_CH2
VAA_CH1
VSS_CH2
VSS_CH1
IREF
XTO
XTI
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
TEST RESET_N SLEEP 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
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 VSS0_PLL
64-Pin TQFP 7 x 7 x 1 mm Body Size 0.4 mm Pin Pitch
TEST RESET_N SLEEP NC NC NC NC 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
NC NC NC NC VAA_XTAL XTO XTI VSS_XTAL VSS_CH2 CVBS8/C4SIF5/Pr2 VAA_CH2 CVBS8/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 REF_IN VSS_PLL VPP0 VPP1 VDDO_PLL PLL_CLK/PRGM7 VSSO_PLL NC NC NC NC
VID_DATA[7]
VID_DATA[6]
VID_DATA[5]
VID_DATA[4]
VID_DATA[3]
VID_DATA[2]
VID_DATA[1]
DVALID/PRGM0
VID_DATA[0]
VDDO
VSSO
FILD/PRGM1
VDD
VSS
PIXCLK
CX25837 and CX25836 Pinout (64-Pin)
HRESET/PRGM2
CX25837 Pinout (80-Pin)
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 NC NC NC NC
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
CX25836/7 Features
* Auto detection and configuration * * * * * * * * * * *
of NTSC/PAL/SECAM video Worldwide video standards - NTSC (M, J, 4.43), PAL (B, D, G, H, I, M, N, Nc), SECAM (K, L) Full 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 Hardware interrupt to eliminate polling Auto detection and configuration for video Fast locking mode for security camera applications (CX25836)
* Auxiliary clock output - For providing an oversampled
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 * Lower power consumption * Small form factor * Pin for pin compatible devices Video Decoder Applications
* Set-top-boxes * Flat panel displays - LCD and Plasma TVs * HDTVs * PVRs/DVRs/VCRs * TV tuners * DVD players * Video cameras

CX25836/7 Diagram
(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
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# 102226A
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
03-0887

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