d i g i t a l i n f o t a i n m e n t p r o d u c t s

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 MacrovisionTM

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.

D i g i t a l V i d e o E n c o d e r

Bt864A/865A

d i g i t a l i n f o t a i n m e n t p r o d u c t s

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

D i g i t a l V i d e o E n c o d e r

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 (I2C) 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

I2C 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.

f e a t u r e s a n d s p e c i f i c a t i o n s

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)

· I2C 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

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