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PDF TW9903 Data sheet ( Hoja de datos )
| Número de pieza | TW9903 | |
| Descripción | Multi-standard Video Decoder | |
| Fabricantes | Techwell | |
| Logotipo |  |
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Techwell, Inc.
TW9903 – Multi-standard Video
Decoder With High Quality Down Scaler
Preliminary Data Sheet
Techwell Confidential. Information may change
without notice.
Disclaimer
This document provides technical information for the user. Techwell, Inc. reserves the right to modify the
information in this document as necessary. The customer should make sure that they have the most
recent data sheet version. Techwell, Inc. holds no responsibility for any errors that may appear in this
document. 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
assist others to infringe upon such rights.
TECHWELL, INC.
1
REV. 0.92 ( B )
06/02/2002
Free Datasheet http://www.datasheet4u.com/
1 page  
TW9903
Overview
Techwell’s TW9903 is a high quality NTSC/PAL/SECAM video decoder that is designed for
multimedia applications. It uses the mixed-signal 3.3V CMOS technology to provide a low-power
integrated solution.
The TW9903 analog front-end is equipped with three separate analog channels that enable it to
accept two possible analog video signal standards: composite or S-video. All channels include an
analog multiplexer (MUX) for maximum flexibility in software controlled input selection. It is possible
to connect up to four composite inputs at one time and allow the software to switch between them.
Alternatively several combinations of composite inputs and S-Video component inputs may be
switched under software control. (Four input channels of any format can be accommodated with
but there is a maximum of 2 S-Video inputs and 2 component inputs.)
The front-end contains all the necessary circuits to simplify the system design. AGC and clamping
circuits, and three 8-bit analog-to-digital converters (ADCs) convert inputs into digital signals for
processing.
The TW9903 uses proprietary adaptive comb filter for chroma and luma separation to achi eve high
video quality. The image enhancement uses nonlinear methods to enhance picture sharpness
with little overshoot.
The advanced synchronization processing can produce stable pictures for non-standard signal
such as those produced by VCR during fast forward, rewind or pause.
The high quality scaler uses multi-tap poly-phase decimation filter to reduce aliasing effects. It can
be programmed to scale-down the output picture to an arbitrary ratio with cropping.
The TW9903 supports flexible pixel int erface. It outputs YCbCr (4:2:2) data stream over 8-bit or
16-bit data path. The output is VMI 1.4 compatible.
A 2-wire serial MPU interface is used to simplify system integration. All the functions can be
controlled through this interface.
Analog Front-end
The analog front-end converts analog video signals to the required digital format. There are three
analog channels with clamping circuits and ADCs. The Y channel has 4-input multiplexer, and a
variable gain amplifier for automatic gain control (AGC). tIs four inputs are identified as MUX0,
MUX1, MUX2 and MUX3. The C_Pb channel has 2-input multiplexer. Its two inputs are identified
as C_PbIn0 and C_PbIn1. The C_Pb channel is internally clamped to the zero level of the bipolar
input source when enabled.
Video Source Selection
All analog signals should be AC-coupled to these inputs.
The Y channel analog multiplexer selects one of the four inputs MUX[0-3]. MUX[0-3] can be
connected to composite video inputs or the Y signal of an S-Video or component input. When
decoding a S-Video input, the Y signal should connect to one of the MUX inputs and the C signal
to C_PbIn0 or C_PbIn1.
TECHWELL, INC.
5
REV. 0.92 ( B )
06/02/2002
Free Datasheet http://www.datasheet4u.com/
5 Page 
TW9903
Output Interface
TW9903
HSYNC
VSYNC
HACTIVE
VACTIVE
DVALID
MPOUT
VCLK
FIELD
CBFLAG
CLKX1, CLKX2
OE#
VD[15:0]
Figure 2. TW9903 Video Data Output Interface
The TW9903 supports a synchronous 8-bit or 16-bit YCbCr 4:2:2 data output stream. The interface
consists of VD [15:0], HSYNC, VSYNC, HACTIVE, VACTIVE, DVALID, MPOUT, VCLK, FIELD,
CBFLAG, and OE# as shown in Figure 2. In 8-bit output mode, Reg0x03[6] is “0”.In 16-bit output
mode,Reg0x03[6] is “1”.
The TW9903 outputs all pixel data and control signals synchronous with CLKX2 rising edge for
both the 8-bit format and the 16bit format.
The mapping of video data stream formats is shown in Table 2. When the output is configured for a
8-bit format, the data is output on pins VD[15:8] with 8 bits of chrominance data preceding 8 bits of
luminance data for each pixel output. The data output is synchronous to the rising edge of CLKX2.
When the output si configured for a 16 -bit format, the luminance data is output on VD[15:8], and
the chrominance data is output on VD[7:0]. In 16-bit mode, the data output is synchronous with the
rising edge of CLKX2 and VD[15:0] data changes when CLKX1 goes high. Figure3a shows 8-bit
video data output timing. Figure3b shows 16-bit video data output timing.
TECHWELL, INC.
11
REV. 0.92 ( B )
06/02/2002
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TW9903.PDF ] | |
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