Texas Instruments | TVP5146 Anti-Aliasing Filters | Application notes | Texas Instruments TVP5146 Anti-Aliasing Filters Application notes

Texas Instruments TVP5146 Anti-Aliasing Filters Application notes
Application Report
SLEA085 – June 2010
TVP5146 Anti-Aliasing Filters
.....................................................................................................................................................
1
Overview
This document describes the anti-aliasing filters used on the TVP5146EVM Revision 1.1. They are
designed based on the sampling frequencies of the ADC(s) given the particular input and apply to both
NTSC and PAL video color standards. The filters are also designed to minimize system costs by using
standard EIA values.
Table 1. TVP5146 EVM Anti-Aliasing Filter Specifics
2
Input Type
Sampling
Frequency
(fs)
Cutoff
Frequency
(fc)
Oversampling
ADCs Used
Comments
CVBS
27MHz
~6.8MHz
2x
1
Each ADC provides 2x oversampling with CVBS
S-Video
27MHz
~6.8MHz
2x
2
Both Y and C are 2x oversampled using two ADCs
Y
27MHz
~6.8MHz
2x
1
Y or YPbPr is 2x oversampled using one ADC
Pb/Pr
27MHz
~6.8MHz
2x
2
PbPr of YPbPr is 2x oversampling using two ADCs
SCART
27MHz
~6.8MHz
2x
2
CVBS and RGB are 2x oversampled using four ADCs
Anti-Aliasing Filter for CVBS, S-Video, and Y (of YPbPr)
This anti-aliasing filter is designed for the CVBS, S-Video and Y (of YPbPr) input signals on the
TVP5146EVM Revision 1.1. The frequency response and group delay curves for this filter design are
shown below.
Figure 1. Schematic
SLEA085 – June 2010
TVP5146 Anti-Aliasing Filters
Copyright © 2010, Texas Instruments Incorporated
1
Anti-Aliasing Filter for CVBS, S-Video, and Y (of YPbPr)
www.ti.com
Figure 2. Frequency Response
Figure 3. Group Delay Response
2
TVP5146 Anti-Aliasing Filters
SLEA085 – June 2010
Copyright © 2010, Texas Instruments Incorporated
Anti-Aliasing Filter for CVBS, S-Video, and Y (of YPbPr)
www.ti.com
Table 2. Example Anti-Aliasing Filter Characteristics (Detail)
Frequency
Composite Filter
Comments
Amplitude
Delay
3.58 MHz
-.05 dB
89 ns
NTSC color subcarrier
4.2 MHz
-0.1 dB
89 ns
NTSC bandwidth
4.43 MHz
-0.1 dB
97 ns
PAL color subcarrier
6.0 MHz
-1.1 dB
123 ns
PAL-D bandwidth
13.5 MHz
-31 dB
21ns
Pixel rate
27.0 MHz
-61.8 dB
4 ns
Sample rate
SLEA085 – June 2010
TVP5146 Anti-Aliasing Filters
Copyright © 2010, Texas Instruments Incorporated
3
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DLP® Products
www.dlp.com
Communications and
Telecom
www.ti.com/communications
DSP
dsp.ti.com
Computers and
Peripherals
www.ti.com/computers
Clocks and Timers
www.ti.com/clocks
Consumer Electronics
www.ti.com/consumer-apps
Interface
interface.ti.com
Energy
www.ti.com/energy
Logic
logic.ti.com
Industrial
www.ti.com/industrial
Power Mgmt
power.ti.com
Medical
www.ti.com/medical
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
RFID
www.ti-rfid.com
Space, Avionics &
Defense
www.ti.com/space-avionics-defense
RF/IF and ZigBee® Solutions www.ti.com/lprf
Video and Imaging
www.ti.com/video
Wireless
www.ti.com/wireless-apps
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2010, Texas Instruments Incorporated
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising