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BT818A Datasheet PDF : 110 Pages
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Bt819A/817A/815A
VideoStream™ Decoders
Bt819A – Video Capture Processor for
TV/VCR Analog Input
Bt817A – Composite Video and S-Video Decoder
Bt815A – Composite Video Decoder
The Bt819A, Bt817A and Bt815A VideoStream Decoders are a family of single-
chip, pin and register compatible, composite NTSC/PAL video and S-video
decoders. Low operating power consumption and power down capability make
them ideal low-cost solutions for PC video capture applications on both desktop
and portable system platforms. They support square pixel and CCIR601 resolu-
tions for both NTSC and PAL. They have a flexible pixel port which supports a
variety of system interface configurations, and they are offered in both a 100-pin
PQFP and 100-pin TQFP.
Functional Block Diagram
MUX0
MUX1
MUX2
MUXOUT
SYNCDET
REFOUT
YREF+
YIN
YREF–
CREF+
CIN
CREF–
ANALOG
MUX
AGC
40 MHZ
ADC
40 MHZ
ADC
XT0 XT1
ULTRALOCKTM
AND
CLOCK
GENERATION
LUMA-CHROMA
SEPARATION
AND
CHROMA
DEMODULATION
I2C JTAG
VIDEO
TIMING
UNIT
SPATIAL AND
TEMPORAL
SCALING
VIDEO
TIMING
OUTPUT
CONTROL
16
OUTPUT
DATA
Distinguishing Features
• Single-Chip Composite/S-Video
NTSC/PAL to YCrCb Digitizer
• On-Chip UltralockTM
• Square Pixel and CCIR601 Resolu-
tion for NTSC and PAL
• Chroma Comb Filtering
• Arbitrary Horizontal Scaling and
Vertical Scaling (using line store)
• 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 I2C Bus Interface
• On-Chip 40-Pixel-Deep
Asynchronous Output FIFO
• 8- or 16-Bit Pixel Interface
• YCrCb (4:2:2) Output Format
• Software Selectable Three-Input
Analog Mux
• Auto NTSC/PAL Format Detect
• Automatic Gain Control
• IEEE 1149.1 (JTAG) Interface
• 100-Pin PQFP and TQFP Packages
Related Products
• Bt812, Bt858, Bt855,
Bt856, Bt857
• Bt851
Applications
• Multimedia
• Image Processing
• Desktop Video
• Video Phone
• Teleconferencing
• Interactive Video
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