Datasheet BT861, BT860 Datasheet (CONEX)

Digital Video Encoder

Bt860/861

digital infotainment products

• Six 10-bit DACs with individual
power management

• Simultaneous output of RGB, S-video
and CVBS, or YUV, S-video and CVBS

• Current drive output DACs for superior
video quality and reduced system cost

• Four output sharpness filtering options
(0, 1, 2, 3.5 dB gain)

• Programmable adjustment of brightness,
contrast, color saturation and hue

Distinguishing Features

High-Performance Multisource Video
for a Wide Range of Systems

Conexant’s Bt860 and Bt861 are multiport digital video encoders
with pixel synchronization and per-pixel blending capabilities.
The three 8-bit YCrCb data ports allow for a variety of video
and graphics overlay configurations useful in video set-top box
applications. The Bt860/861 is designed specifically for video
systems requiring the generation of simultaneous composite,
S-video (Y/C) and either component YUV or RGB (SCART)
video signals.

High-performance video combined with the right set of features
make the Bt860/861 a versatile device for almost any video
system. 10-bit DACs provide the clear, lifelike video required for
modern satellite and cable television set-top boxes, Super VCD
and DVD players, PC add-in cards, video conferencing systems
and digital cameras. Several power conservation modes extend
portable system battery life and help reduce system heating.
New televisions and media which make use of wide screen 16:9
aspect ratios are also supported by the Bt860/861 to provide the
best flexibility, performance and functionality.

Digital Video Encoder

Bt860/861

digital infotainment products

Multisource video is a key feature of the Bt860/861. The
primary video port (P) is designed to accept both digital
video and graphics overlay content from an MPEG video
decoder or OSD ICs. This input stream can be either ITU-R
BT.601 or 656 in format — as is typically generated by
MPEG decoder ICs. The second video port (VID) will
accept an alternate digital video stream from a video
decoder, such as Conexant’s Video Stream family of
devices. The third port (OSD) may be used for dedicated
graphics overlay devices, such as providing a higher­quality user interface or superior on-screen titles.
Alternatively, a second MPEG decoded stream could
also be the input to the OSD port for use with multiple
MPEG decoder ICs. A pixel synchronization mechanism
ensures proper timing between the three ports to
deliver the highest-video quality.

The block diagram below illustrates an example of
how the Bt860/861 may be used in a TV set-top box,
DVD player, or PC card. The white boxes represent

the typically used components. The light gray shaded
box represents the optional components used for video
capture. The medium grey shaded box represents the
optional graphic processor IC, which may be added for
enhanced OSD or superior user interface.

Worldwide Standards Supported

Worldwide video standards are supported, including
NTSC-M (North America, Taiwan, Japan), PAL-B,D,G,H,I
(Europe, Asia), PAL-M (Brazil), PAL-N (Uruguay,
Paraguay), PAL-Nc (Argentina), PAL-60, and SECAM.
The Bt860 and Bt861 are pin and functionally
identical, except the Bt861 also contains Macrovision

7.X copy protection circuitry used in DVD players
and TV set-top boxes. This permits all types of video
systems to use the Bt860/861 and achieve truly high­performance video.

Bt860/861 functional block diagram

Typical system functional block diagram

Multiple Video Outputs
for Televisions of All Varieties

The Bt860/861 provides analog luminance (Y) and chrominance (C)
information in the Y and C outputs for interfacing with equipment
having S-Video inputs. Component video outputs for Y, and the
color component signals (U and V) are available for use with the
latest DVD players and high-performance televisions. Analog
RGB video is also available to permit support of the European
SCART/PeriTV interface. Composite analog video is output
simultaneously to interface with all types of televisions, and VCRs.
One composite analog output has a programmable luma delay
to permit the synchronization of both luminance and chrominance
when video is transmitted via an RF modulator. A video multiplexer
on the output permits tremendous flexibility of output signal
configurations. A two-wire teletext (WST-B) interface is also
included in the Bt860/861. The table below illustrates the various
output configurations of the Bt860/861 DACs.

I2C Interface

Bt860/861 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 Bt861. Deactivation of
I

2

C communication is possible by asserting sleep or reset modes.

What is a Video Encoder?

A video encoder is an electronic integrated circuit (chip)

which 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 which

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 instruct 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.

OUTMODE[2:0] DAC A DAC B DAC C DAC D DAC E DAC F

000 Y C CVBS Y V U
001 Y C CVBS R G B
010 Y C CVBS CVBS_DLY CVBS CVBS

011 YCYYCC
100 CVBS CVBS_DLY CVBS Y V U
101 CVBS CVBS_DLY CVBS R G B

110 CVBS CVBS_DLY CVBS CVBS_DLY CVBS CVBS

111 Y C CVBS CVBS_DLY C Y

*Note: CVBS_DLY is the composite video signal with the luminance component delayed

features and specifications

Product Features

• Six 10-bit DACs with individual
power management

• Simultaneous output of RGB, S-video,
and CVBS, or YUV, S-video, and CVBS

• Current drive output DACs for superior
video quality and reduced system cost

• Dynamic video load sense circuitry
for reduced power operation

• Four output sharpness filtering options
(0, 1, 2, 3.5 dB gain)

• Programmable adjustment of brightness,
contrast, color saturation, and hue

• Glueless interface with a video decoder
output supports locking to a digital
video input stream

• Three 8-bit 4:2:2 YCrCb inputs
for simultaneous digital video
and graphics overlays

• Worldwide NTSC, PAL, PAL-60 and SECAM
video standard outputs

• ITU-R BT.656-4, ITU-R BT.601-5 and square
pixel digital video input options

• 2X oversampling and internal filtering
for reduced cost

• 3.3V single supply voltage with 5V
tolerant inputs

• Multiple aspect ratio output support
(VARIS II,WSS 4:3, 14:9, 16:9)

• Programmable luma delay (two-channels)

• Master or slave video timing with
programmable HSYNC delay

• Interlaced/noninterlaced operation

• Teletext encoding (WST system B)

• Closed Caption and Extended Data
Services encoding

• On-board voltage reference for greater
accuracy and stability

• Reduced power modes

• 400 KHz serial programming interface

• Internal color bar generation for simplified
systems testing

• Macrovision 7.x copy protection circuitry
(Bt861 only)

• Housed in a compact 80-pin MQFP package

Applications

• Digital satellite television receivers
(DBS/DVB/DSS)

• Digital and analog cable television receivers

• DVD players

• DVD PC add-in cards with TV output

• Internet appliances

• PC video editing cards

• Video game appliances

• Video conferencing systems

Related Products

• Bt835

• Bt852

• Bt856/857

• Bt864A/865A

• Bt866/867

• Bt868/869

Implementation

The Bt860/861 is packaged in an 80-pin Plastic Quad Flat Pack (PQFP) with a

16.95 x 17.45 mm body size. It requires only a minimum of discrete passive
support components. It is ideal for low-cost, high-performance video
systems and consumer electronics.

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

Further Information

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Digital Infotainment
Printed in USA

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U.S. South Central – Texas

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U.S. Northeast – Massachusetts

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U.S. Southeast – Florida/
South America

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U.S. Mid-Atlantic – Pennsylvania

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Canada – Ontario

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Europe

Europe Central – Germany

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Europe North – England

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Europe – Israel/Greece

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Europe South – France

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Europe Mediterranean – Italy

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Europe – Sweden

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Europe – Finland

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Asia – Pacific

Taiwan

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Australia

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China – Central

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China – South

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China – South (Satellite)

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China – North

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India

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Korea

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Korea (Satellite)

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Singapore

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Japan

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