Datasheet BT865A, BT864A Datasheet (CONEX)

digital infotainment products

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

• 10-bit DACs

• 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

digital infotainment products

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

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.

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

[e-mail]
1-800-854-8099 (North America)
33-14-906-3980 (International)
DI.PB07 98-6221
Digital Infotainment
Printed in USA

Web Site

www.conexant.com

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Conexant and the Conexant symbol are trademarks of Conexant Systems, Inc.