NTSC/PAL/SECAM Video Decoder for Multimedia Applications
NTSC/PAL/SECAM Video Decoder for Multimedia Applications
CRT, LCD, PDP and Projection TV
Multifunction LCD Monitor (Monitor TV)
DVD-Recorder
PC TV Capture Card
CCTV Digital Video Recorder
www.intersil.com
Techwell
Target Applications
Features
Analog Video Decoder
Techwell's TW9919 is a high quality NTSC/PAL/SECAM video decoder
that is designed for multimedia applications. It uses the mixed-signal
2.5V/3.3V CMOS technology to provide a low-power integrated solution.
The TW9919 analog front-end is equipped with six separate analog
channels that enable it to accept various analog video input standard
including Composite video, S-video, component video (YCbCr), and SCART
RGB. With the analog FB support, it also allows the mixing of composite or
S-video input with YCbCr/RGB input. All channels include an analog
multiplexer (MUX) for maximum flexibility in software controlled input
selection. It is possible to connect up to five composite inputs or two S-
video inputs or two YCbCr inputs or two SCART RGB inputs at one time and
allow the software to switch between them. Alternatively, a maximum
combination of five of these inputs may be switched under software
control. In the PIP mode, a maximum combination of four composite/S-
video input can be mixed with any of two YCbCr/RGB inputs through
The front-end contains all the necessary circuits to simplify the system
design. The built-in six high quality 10-bit analog-to-digital converters
(ADCs)
convert
inputs
into
digital
signals
for
processing.
The TW9919 uses proprietary adaptive 3D comb filter to achieve best NTSC
and PAL quality fpr stationary portion. For motion part of the image, it
employs 2H(NTSC)/4H(PAL) comb filter for chroma and luma separation to
achieve high video quality. The image enhancement includes horizontal
The advanced synchronization processing can produce stable pictures for
non-standard signal such as those produced by VCR trick mode.
The high quality scaler uses multi-tap poly-phase decimation filter to
accurately scale down the image with minimum phase error. It can be
programmed to scale-down the output picture to an arbitrary ratio with
The TW9919 supports flexible pixel interface. It outputs YCbCr (4:2:2) data
stream over 10-bit or 20-bit data path. It also supports both free-running
A 2-wire serial MPU interface is used to simplify system integration. All the
TW9919
NTSC (M, 4.43) and PAL (B, D, G, H, I, M, N, N
combination), PAL (60), SECAM support with
automatic format detection
Advanced synchronization processing for VCR
fast forward, backward, and pause mode
Software selectable 14 analog input terminals
allow maximum flexibility:
Up to five composite, or two S-Video or two
Up to two SCART RGB inputs with FB.
Six 10-bit ADCs with analog clamping circuit
and anti-aliasing filter
Fully programmable static gain or automatic
gain control for the Y and G(Y) channel
Programmable white peak control for the Y
channel
High quality RGB/YCbCr mixing by Fast
Blanking signal
6x10-bit Multi-Standard 3D Comb Filter Video Decoder
with SCART and RGB Mixing Support
external FB control.
and vertical peaking, CTI and BCS control.
cropping.
clock and line-locked clock output.
functions can be controlled through this interface.
YCbCr inputs
TECHWELL
VIDEO
DECODERS