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PDF TW9906 Data sheet ( Hoja de datos )
| Número de pieza | TW9906 | |
| Descripción | Enhanced 3 x 10-Bit Multi Standard Comb Filter Video Decoder | |
| Fabricantes | Techwell | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TW9906 (archivo pdf) en la parte inferior de esta página. Total 70 Páginas | ||
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mDisclaimer
oThis document provides technical information for the user. Techwell, Inc. reserves the right to modify the
.cinformation in this document as necessary. The customer should make sure that they have the most
Urecent data sheet version. Techwell, Inc. holds no responsibility for any errors that may appear in this
t4document. Customers should take appropriate action to ensure their use of the products does not infringe
upon any patents. Techwell, Inc. respects valid patent rights of third parties and does not infringe upon or
eassist others to infringe upon such rights.
www.DataSheTECHWELL, INC.
1
REV.B
11/01/2005
1 page  
TW9906
TW9906 – 3x10-bit Multi-Standard Comb Filter Video
Decoder with YCbCr Component Input
Introduction and Features
Techwell’s TW9906 is a high quality
NTSC/PAL,/SECAM multi-standard video decoder
plus YCbCr component inputs designed for
multimedia applications.
TW9906 uses the mixed-signal 2.5V/3.3V CMOS
technology to provide a low-cost and low-power
integrated solution. Minimum external components
are required due to its integrated analog front-end
containing anti-aliasing filter, AGC, clamping, and
three 10-bit high speed ADCs. For composite inputs,
an adaptive comb filter and luma/chroma processing
produce exceptionally high quality pictures using
proprietary techniques. A high quality internal scaling
engine offers arbitrarily filtered down scaling of the
output video. Its VBI capability is enhanced with built-
in VBI slicer, filter, FIFO and VBI data pass-through
function to support common data services.
The main features of the TW9906 are
• 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 trick mode
and weak signal
• Software selectable analog inputs allows any of the
following combinations:
• Up to five composite video inputs
• Four composite, one S-video or one YCbCr input.
• Two composite, two S-Video or two YCbCr inputs.
• Three composite, one S-Video and one YCbCr input.
• Three 10-bit ADCs with clamping circuit and anti-aliasing
filter.
• Fully programmable static or automatic gain control for the
Y channel
• Programmable white peak control for the Y channel
• Adaptive 4H comb filter for the best image quality.
• PAL delay line for color phase error correction
• Digital sub-carrier PLL for accurate color decoding
• Digital Horizontal PLL and advanced synchronization
processing for non-standard video signals
• Programmable hue, brightness, saturation, contrast, and
sharpness
• Blue stretch
• Image enhancement with 2D peaking and CTI.
• Automatic color control and color killer
• IF compensation filter
• Detection of level of copy protection according to
Macrovision standard
• YCbCr input supports 480i/576i and sub-sampled
480p/576p with auto-detection.
• Video Output
• Support both free-running and line-locked clock outputs
• Programmable output cropping
• High quality horizontal filtered scaling with arbitrary scale
down ratio
• VMI 1.4 compatible 10-bit or 20-bit pixel interface
• ITU-R 601 or ITU-R 656 compatible output YCbCr(4:2:2)
output format
• VBI slicer supporting industrial standard data services with
data packet filter capability
• Built-in VBI FIFO for convenient access through host
interface
• VBI data pass through, raw ADC data for Intercast™
• Field locked audio clock generator
• Miscellaneous
• Two wire MPU serial bus interface
• Power-down mode
• Typical power consumption 0.25W
• Single 27MHz crystal for all standards
• Supports 24.54MHz and 29.5MHz crystal for high quality
square pixel format
• 3.3V / 5V tolerant I/O
• 2.5V / 3.3V Power Supply
• 80 pin TQFP package
TECHWELL, INC.
5
REV.B
11/01/2005
5 Page 
TW9906
Component Processing
Luminance Processing
The TW9906 adjusts brightness by adding a programmable value (in register BRIGHTNESS) to
the Y signal. It adjusts the picture contrast by changing the gain (in register CONTRAST) of the Y
signal.
The TW9906 video decoder also performs a coring function. It can force all values below a certain
level, programmed in the Coring Control Register, to zero. This is useful because human eyes are
sensitive to variations in nearly black images. Changing levels near black to true black, can make
the image appears clearer.
Sharpness
The TW9906 also provides a sharpness control function through control registers. It provides the
control in 16 steps up to +12db. The center frequency of the enhancement curve is selectable by
software control. It also provides a high frequency coring function to minimize the amplification of
high frequency noise. The coring level is adjustable through the Coring Control register. The same
function can also be used to soften the images. This can be used to provide noise reduction on
noisy signal.
To further enhance the image, a programmable vertical peaking function is provided for up to +6db
of enhancement. A programmable coring level can be adjusted to minimize the noise
enhancement.
CTI
The TW9906 provides the Color Transient Improvement function to further enhance the image
quality. The CTI enhance the color edge transient without any overshoot or under-shoot.
The Hue and Saturation
When decoding NTSC signals, TW9906 can adjust the hue of the chroma signal. The hue is
defined as a phase shift of the subcarrier with respect to the burst. This phase shift can be
programmed through a control register.
The color saturation can be adjusted by changing the gain of Cb and Cr signals for all NTSC, PAL
and SECAM formats. The Cb and Cr gain can be adjusted independently for flexibility.
Power Management
The TW9906 can be put into power-down mode in which its clock is turned off for most of the
circuits. The Y, C(Pb) and V(Pr) path can be separately powered down.
Control Interface
The TW9906 registers are accessed via 2-WIRE SERIAL MPU interface. It operates as a slave
device. Serial clock and data lines, SCL and SDA, transfer data from the bus master at a rate of
400 Kbits/s. The TW9906 has one serial interface address select pins to program up to two unique
serial addresses TW9906. This allows as many as two TW9906 to share the same serial bus.
Reset signals are also available to reset the control registers to their default values.
TECHWELL, INC.
11
REV.B
11/01/2005
11 Page | ||
| Páginas | Total 70 Páginas | |
| PDF Descargar | [ Datasheet TW9906.PDF ] | |
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