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PDF TW9910 Data sheet ( Hoja de datos )
| Número de pieza | TW9910 | |
| Descripción | Low Power NTSC/PAL/SECAM Video Decoder | |
| Fabricantes | Techwell | |
| Logotipo |  |
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Techwell, Inc.
www.datasheet4u.com
TW9910 – Low Power NTSC/PAL/SECAM
Video Decoder with VBI Slicer
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. A
09/21/2006
1 page  
TW9910
Low Power NTSC/PAL/SECAM
Video Decoder with VBI Slicer
Introduction
The TW9910 is a low power NTSC/PAL/SECAM video decoder chip that is designed for portable
www.datasheet4u.comapplications. 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 that needed to decode all analog video
standards.
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 embedded sync.
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
standard including AGC and colorstripe pulses.
A 2-wire serial host interface is used to simplify system integration. All the functions can be controlled
through this interface.
Analog Front End
The analog front-end prepares and digitizes the AC coupled analog signal for further processing. Both
channels have built-in anti-aliase filter and 10-bit over-sampling ADCs. The characteristic of the filter is
available in the filter curve section. The Y channel has additional 4-input multiplexer, and a variable
gain amplifier for automatic gain control (AGC). It can support a maximum input voltage range of 1.4V
without attenuation. The C channel has only one input with built-in clamping circuit that restores the DC
level. Software selectable analog inputs allow two possible input combinations:
1. Four selectable composite video inputs.
2. Three selectable composites and one S-video input.
Sync Processor
The sync processor of TW9910 detects horizontal synchronization and vertical synchronization signals
in the composite video or in the Y signal of an S-video or component signal. The processor contains a
digital phase-locked-loop and decision logic to achieve reliable sync detection in stable signal as well as
in unstable signals such as those from VCR fast forward or backward. It allows the sampling of the
video signal in line-locked fashion.
Y/C separation
For NTSC and PAL standard signals, the luma/chroma separation can be done either by adaptive
comb filtering or notch/band-pass filter combination. For SECAM standard signals, only notch/band-
pass filter is available. The default selection for NTSC/PAL is comb filter. The characteristics of the
band-pass filter are shown in the filter curve section.
TECHWELL, INC.
5
REV. A
09/21/2006
5 Page 
TW9910
Low Power NTSC/PAL/SECAM
Video Decoder with VBI Slicer
www.datasheet4u.com
VCLK
HACTIVE
DVALID
VD[15:8]
HACTIVE x 2 VCLK
360x2 VCLK
0x00
Cb0 Y0 Cr0 Y1 Cb2 ... Cb358 Y358 Cr358 Y359
Figure 2. 8 bit mode Horizontal Down Scaling Output
Vertical Down Scaling Output
TW9910 generates Vertical Down Scaling output data. Figure 3 shows its timing. As shown on Figure
3, HACTIVE is NOT generated on invalid line as default (VSCTL is “0”). If VSCTL is set to “1”,
HACTIVE is generated on every lines during VACTIVE active period. DVALID is not generated on
invalid lines in each setting. Invalid lines for Vertical down scaling are generated during VACTIVE active
period. If MODE bit is set to “1” for VIP mode, EAV/SAV codes are not generated on those lines without
HACTIVE signal. All CbCr data will be 80H and all Y data will be 10H the same as H-blanking data in
ITU-R BT.656 data stream.
HSYNC
HACTIVE
DVALID
VACTIVE
LVALID
(OPTION)
Figure 3. Vertical Down Scaling Output
TECHWELL, INC.
11
REV. A
09/21/2006
11 Page | ||
| Páginas | Total 70 Páginas | |
| PDF Descargar | [ Datasheet TW9910.PDF ] | |
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