Bt829B/827B

VideoStreamII Decoders

Advance Information

This document contains information on a product under development. The parametric information contains target
parameters that are subject to change.

Bt829B–

Video Capture Processor and Scaler for
TV/VCR Analog Input

Bt827B–

Composite Video and S-Video Decoder

The Bt829B and Bt827B VideoStream™ Decoders are a family of single-chip, pin-
and register-compatible, composite NTSC/PAL/SECAM video and S-Video decod-
ers. They are also pin and register backward compatible with the Bt829A/827A
family of products. Low operating power consumption and power-down capabil-
ity make them ideal low-cost solutions for PC video capture applications on both
desktop and portable system platforms with a 3.3 V digital I/O interface. They
support square pixel and CCIR601 resolutions for NTSC, PAL, and SECAM video.
They have a flexible pixel port which supports a variety of system interface config-
urations, and they are offered in a 100-pin Plastic Quad Flat Pack (PQFP).

Functional Block Diagram
Distinguishing Features

• Single-chip composite/S-Video NTSC/PAL/
SECAM to YCrCb digitizer
• On-chip Ultralock



• Square Pixel and CCIR601 Resolution for:
– NTSC (M)
– NTSC (M) without 7.5IRE pedestal
– PAL (B, D, G, H, I, M, N, N
combination)
– SECAM
• Chroma comb filter
• Arbitrary horizontal and 5-tap vertical
filtered scaling
• Hardware closed-caption decoder
• Vertical Blanking Interval (VBI) data
pass-through
• Arbitrary temporal decimation for a
reduced frame-rate video sequence
• Programmable hue, brightness, saturation,
and contrast
• User-programmable cropping of the video
window
• 2x oversampling to simplify external
analog filtering
• Two-wire Inter-Integrated Circuit (I

2

C) bus
interface
• 8- or 16-bit pixel interface
• YCrCb (4:2:2) output format
• Software selectable four-input analog MUX
• 4 fully programmable GPIO bits
• Auto NTSC/PAL format detect
• Automatic Gain Control (AGC)
• 3.3 V I/O
• Typical power consumption 0.85 W
• IEEE 1149.1 Joint Test Action Group
(JTAG) interface
• 100-pin PQFP

Related Products

• Bt829A, Bt856/857, Bt864A/865A, Bt864/
865, Bt852

Applications

• Multimedia
• Image processing
• Desktop video
• Video phone
• Teleconferencing
• Interactive video

ADC
Ultralock
and
Clock
MUX0
MUX1
MUXOUT
SYNCDET
REFOUT
YREF+
YIN
16
Decimation LPF
Output
Luma-Chroma
Separation
and
Chroma
Output
Video
YREF–
Output F
o
r
matting
Analog
MUX
ADC
CREF+
CIN
CREF–
AGC
Timing
Control
Data
I

2

C JTAG
Demodulation
Spatial and
Temporal
Scaling
Video
Timing
Unit
Generation
XT0 XT1
40 MHz
40 MHz
MUX2
MUX3