Datasheet BT865A, BT864A Datasheet (CONEX)

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Distinguishing Features
• 8- or 16-bit 4:2:2 YCrCb inputs
• NTSC-M/PAL/PAL-M/PAL-N/PAL-Nc video outputs
• S-video/RGB (SCART)/CVBS outputs
• CCIR 601 or square pixel operation
• 2x oversampling
• Current output DACs for the highest video quality and reduced cost
High Performance YCrCb to NTSC/PAL Digital Video Encoders
Conexant’s Bt864A and Bt865A are designed for video systems that require the generation of high-quality composite, Y/C (S-video) or RGB (SCART) video signals from an 8- or 16-bit YCrCb video stream. Worldwide video standards are supported, including NTSC-M (N. America, Taiwan, Japan), PAL-B,D,G,H,I (Europe, Asia), PAL-M (Brazil), PAL-N (Uruguay, Paraguay), and PAL-Nc (Argentina).
The Bt864A and Bt865A are pin-compatible and functionally identical, except the Bt865A can also output the Macrovision version 7 anticopy algorithm. Either master or slave mode operation may be implemented to provide the highest video performance when interfaced with any MPEG decoder. CCIR 601 or square pixel video signals may be input to provide maximum flexibility in the system architecture.
The Bt864A/865A and other Conexant video encoders have been designed into numerous high-performance and high-volume consumer applications worldwide. These include satellite set-top boxes, DVD players, PC add-in kits, digital cameras, video CD players, video conferencing systems and other applications that demand the highest quality video.
Digital Video Encoder
Bt864A/865A
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Flexible Operation for a Wide Range of Video Systems
High-performance video combined with the right set of features make the Bt864A/865A a versatile device for almost any video system. 10-bit DACs provide the high-resolution video required for modern satellite set-top boxes, DVD players, PC add-in cards, video conferencing systems and digital cameras. Several power conservation modes extend portable system battery life and help to reduce system heating. New televisions and media, which make use of wide screen 16:9 aspect ratios, are also supported by the Bt864A/865A to provide the best flexibility, performance and functionality.
The Bt864A/865A accepts video data in a variety of ways: CCIR 601, NTSC, and PAL square pixel formats. This provides system designers with maximum flexibility. Either 3.3V or 5V operation is possible with the Bt864A/865A to permit operation within any system environment. Horizontal sync and vertical sync may be configured as inputs (slave mode) or outputs (master mode). In addition to the normal blanking which occurs during Hsync and Vsync, blanking may be externally controlled during active video. The rise and fall times of sync, the burst envelope, and closed caption data are internally controlled.
Functional block diagram
Digital Video Encoder
Bt864A/865A
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What is a Video Encoder?
A video encoder is an electronic integrated circuit (chip)
that delivers the signal to your television from a DVD or
video CD player, LaserDisc player, cable or satellite TV
set- top box, digital camera,video conferencing system,
Internet browser or personal computer (PC). It is the
chip that makes everyone’s favorite shows look bright,
crisp, colorful and clear. With today’s new digital video
systems,TV pictures can look their best when showing
movies and sports from DVD and TV set-top boxes.
Video encoder chips today have the functions of four
separate chips integrated into one single chip. These chips
take the digital video information which is stored on DVD
discs or digital camera memory cards, or transmitted to a
satellite dish TV receiver or cable tuner box, and convert it
into the “old-fashioned” type of signal a TV requires. The
video encoder converts digital bits into analog electrical
signals, which tell the TV what colors should be shown on
the screen and how bright or dark they should be. Better
quality video encoder chips produce better quality video
and make the images seem more lifelike and exciting.
Video encoder technology has improved rapidly in recent
years, allowing people to connect a variety of different video
devices to their TVs and create the home entertainment
systems of their dreams. These relatively inexpensive
devices are one of the most critical components of modern
video systems, and they have found widespread usage in
business, home office, medical, security, professional video
studios, and all types of consumer video applications.
Analog luminance (Y) and chrominance (C) information is available on the Y and C outputs for interfacing to S-video equipment. The composite analog video signal is output simultaneously onto two outputs. This enables two simultaneous baseband composite video signals, or one output, to provide baseband composite video while the other drives an RF modulator. Programmable luminance delay (single-channel) permits the synchronization of both luminance and chrominance when video is transmitted to a television monitor via an RF modulator. Analog RGB is also available to allow for support of the European SCART/PeriTV interface. A two-wire teletext (WST-B) interface is also included in the Bt864A/865A.
Macrovision anticopy circuitry is included in the Bt865A to support DVD and newer set-top box services. The Bt864A is pin and function compatible with the Bt865A to permit video design and testing for applications that do require Macrovision circuitry and those that do not.
I2C Interface
Bt864A/865A registers are accessed via a two-wire Inter-Integrated Circuit (I
2
C) interface. Serial clock and data lines (SCL and SDA) are used to transfer data at a rate of 100 Kbps. These lines are used to access and program the internal registers of the device, including the Macrovision registers of the Bt865A. Deactivation of I
2
C communication is possible by asserting sleep or reset modes.
Implementation
The Bt864A/865A is packaged in a 52-pin Plastic Quad Flat Pack (PQFP) with a 14 mm x 14 mm body size. It requires only a minimum of discrete passive support components. It is ideal for low-cost and high-performance video systems and consumer electronics.
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features and specifications
Product Features
• 8- or 16-bit 4:2:2 YCrCb inputs
• NTSC-M/PAL/PAL-M/PAL-N/PAL-Nc
composite video outputs
• S-video/RGB (SCART) outputs
• CCIR 601 or square pixel operation
• 2x oversampling
• 10-bit DACs
• Master or slave video timing
• Auto mode detection function (slave mode)
• Interlaced/noninterlaced operation
• Macrovision 7 support (Bt865A only)
• Closed caption encoding
• Teletext encoding (WST system B)
• I
2
C interface
• On-board voltage reference
• Power-down modes
• 52-pin PQFP package
• Programmable luma delay (single-channel)
• 3.3V or 5V supply voltage
• VARIS-II (16:9) aspect ratio support
Applications
Digital cable systems
Satellite television set-top boxes (DBS/DSS)
DVD players
Video CD players
Digital cameras
Video conferencing systems
PC add-on cards
PC video editing
Related Products
Bt835
Bt852
Bt856/857
Bt860/861
Bt866/867
Bt868/869
Further Information
literature@conexant.com 1-800-854-8099 (North America) 33-14-906-3980 (International) DI.PB07 98-6221 Digital Infotainment Printed in USA
Web Site
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Conexant Systems,Taiwan Co.,Ltd. Room 2808 International Trade Building 333 Keelung Road,Section 1 Taipei 110,Taiwan, ROC Phone: (886 2) 2720 0282 Fax: (886 2) 2757 6760
Conexant and the Conexant symbol are trademarks of Conexant Systems, Inc.
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