NTSC/PAL/SECAM Video Decoder for Portable ApplicationsNTSC/PAL/SECAM Video Decoder for Portable Applications
Mobile Phone
Portable Media Player
Portable DVD player
Picture in Picture (PIP) decoder
DVD Recorder
www.intersil.com
Techwell
Techwell
Target Applications
FeaturesFeatures
Video Decoder
The TW9910 is a low power NTSC/PAL/SECAM video decoder chip that is
designed for portable applications. It consumes less than 100mW in typical
composite input application. The available power down mode further
reduces the power consumption. It uses the 1.8V for both analog and
digital supply voltage and 3.3V for I/O power. A single 27MHz crystal is all
The video decoder decodes the base-band analog CVBS or S-video signals
into digital 8 or 16-bit 4:2:2 YCbCr for output. It consists of analog front-
end with input source selection, variable gain amplifier and analog-to-
digital converters,Y/C separation circuit, multi-standard color decoder (PAL
BGHI, PAL M, PAL N, combination PAL N, NTSC M, NTSC 4.43 and SECAM)
and synchronization circuitry. The Y/C separation is done with high quality
adaptive 4H comb filter for reduced cross color and cross luminance. The
advanced synchronization processing circuitry can produce stable pictures
for non-standard signal as well as weak signal. A video scaler is provided to
arbitrarily scale down the output video in a packed format. The output of
the decoder is line-locked and formatted to the ITU-R 656 output with
The TW9910 also includes circuits to detect and process vertical blanking
interval (VBI) signal. It slices and process VBI data for output through video
bus. Some information can also be alternatively retrieved through host
interface. It also detects copy-protected signal according to Macrovision
A 2-wire serial host interface is used to simplify system integration. All the
TW9910
NTSC (M, 4.43) and PAL (B, D, G, H, I, M, N, N
combination), PAL (60), SECAM support with
automatic format detection
Software selectable analog inputs allows any of
the following combinations, e.g. 4 CVBS or ( 3
CVBS and 1 Y/C ).
Built-in analog anti-aliasing filter
Two 9-bit ADCs and analog clamping circuit
Fully programmable static gain or automatic gain
control for the Y channel
Programmable white peak control for the Y
channel
Low Power NTSC/PAL/SECAM
Video Decoder with VBI Slicer
TECHWELL
VIDEO
DECODERS
embedded sync.
standard including AGC and colorstripe pulses.
functions can be controlled through this interface.
that needed to decode all analog video standards.
Video Processing
4-H adaptive comb filter Y/C separation
PAL delay line for color phase error correction
Image enhancement with peaking and CTI
Digital sub-carrier PLL for accurate color
decoding
Digital Horizontal PLL for synchronization
processing and pixel sampling
Advanced synchronization processing and sync
detection for handling non-standard and weak
signal
Programmable hue, brightness, saturation,
contrast, and sharpness
Automatic color control and color killer
Chroma IF compensation
Detection of level of copy protection according
to Macrovision standard
TechwellTechwell
TW9910TW9910
TV Tuner
NTSC/PAL
SECAM
TW9910
601/
656
PRELIMINARY
Block Diagram
Composite
S-Video
TW9910 Block Diagram
Miscellaneous
Two wire MPU serial bus interface
Support Real Time Control interface
Power save and Power down mode
Typical power consumption < 100mW
Single 27MHz crystal for all standards
Supports 24.54MHz and 29.5MHz crystal for high
resolution square pixel format decoding
3.3 V tolerant I/O
1.8V/3.3 V power supply
48-pin QFN or 44-pin LQFP package
Techwell
Video Output
ITU-R 601 or ITU-R 656 compatible YCbCr(4:2:2) output format
VBI slicer supporting industrial standard data services
VBI data pass through, raw ADC data output
© 2006 Intersil Americas Inc. All Rights Reserved. The following are trademarks or registered trademarks of Intersil Americas Inc.:
Intersil, Intersil logo, “i” and Design. All other trademarks are the property of the respective trademark owners.
www.intersil.com
TW9910
Low Power NTSC/PAL/SECAM Video Decoder with VBI Slicer
NTSC/PAL/SECAM Video Decoder for Portable ApplicationsNTSC/PAL/SECAM Video Decoder for Portable Applications
MUX0
MUX1
MUX2
MUX3
Analog Video In
9-bit
ADC
MUX
AGC
9-bit
ADC
VBI Slicer
CIN0
Clock
Line-lock
clock
Generator
27Mhz
PDN
SCLK
SDAT
2Wire
Serial Bus
4H Adaptive
Comb Filter
Sync
Processor
Chroma
Demodulation
Luma/Chroma
Processor
Scaling / Video Interface
U
V
Y
VD (15:8)
VD (7:0)
HS
VS
CLKx2
MPOUT
Video Scaler
High quality horizontal filtered scaling with arbitrary scale down
ratio
Phase accuracy better than 1/32 pixel
Selectable anti-alias filter
Vertical down scaling by line dropping
PRELIMINARY
