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LMH1981EVAL

LMH1981EVAL

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    -

  • 描述:

    BOARD EVALUATION FOR LMH1981

  • 数据手册
  • 价格&库存
LMH1981EVAL 数据手册
User's Guide SNLA094C – February 2007 – Revised April 2013 AN-1599 LMH1981 Evaluation Board Instruction Manual 1 General Description The LMH1981 evaluation board can be used to evaluate the LMH1981 multi-format sync separator and as a reference for designing the PCB layout. For more information on PCB layout considerations, see the LMH1981 Multi-Format Video Sync Separator Data Sheet (SNLS214). 2 Power Supply The board should be powered with a clean supply voltage of 3.3 V to 5.0 V using the banana jacks VCC (J2) and GND (J3). The supply should be well-regulated within ±5% variation of the voltage range and should not be shared directly with other digital circuitry. 3 Video Input A high-quality DC-coupled video source should be connected to the video input BNC (J1), which is terminated on-board via a 75 Ω load resistor. For AC-coupled video sources, it may be necessary to reduce the value of the input coupling capacitor (C4) as described in the data sheet; otherwise, sync loss may occur during significant changes in video average picture level (random white-to-black field transitions). It is recommended to drive the LMH1981 input by a professional-grade DC-coupled video reference. Because the input can accept either SD or HD video inputs, the PCB footprints for the chroma filter components were not populated. For SD composite video inputs, it may be necessary to use a RC lowpass filter to attenuate the chroma component so it does not extend below the 50% sync level and also to improve overall signal-to-noise ratio. The RC filter cutoff frequency is typically set between 0.5 MHz and 2 MHz, which corresponds to chroma attenuation between 17 dB and 6 dB for a 3.58 MHz subcarrier (NTSC). For HD video inputs, it is suggested to bypass any composite video filtering, as it may reduce the bandwidth of the HD tri-level sync signal and, thus, increase timing jitter on the HSync output. 4 Test Points Test points are provided to probe the input and output signals using oscilloscope probes with high input impedance and low capacitance. All trademarks are the property of their respective owners. SNLA094C – February 2007 – Revised April 2013 Submit Documentation Feedback AN-1599 LMH1981 Evaluation Board Instruction Manual Copyright © 2007–2013, Texas Instruments Incorporated 1 Board Schematic 5 www.ti.com Board Schematic U1 LMH1981 ODD/EVEN OUT R1 1 14 R2 OEOUT REXT 10k 1% 100 2 13 GND R9 OPEN BURST OUT R3 BPOUT 100 R11 OPEN 3 VCC 12 C SYNC OUT R4 CSOUT VCC1 100 R12 OPEN BNC J1 C4 R7 4 11 VIN R15 1 PF 75 VCC3 VCC 0: C2 0.1 PF INPUT 5 10 GND GND VCC2 VFOUT C1 0.1 PF 6 VCC + C3 10 PF 9 R5 VIDEO FORMAT OUT 100 R13 OPEN H SYNC OUT R8 7 8 HSOUT R10 100 OPEN J3 GND 2 V SYNC OUT R6 VSOUT GND 20 100 R14 OPEN J2 VCC VCC AN-1599 LMH1981 Evaluation Board Instruction Manual SNLA094C – February 2007 – Revised April 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Board Layout www.ti.com 6 Board Layout Figure 1. Top Side SNLA094C – February 2007 – Revised April 2013 Submit Documentation Feedback AN-1599 LMH1981 Evaluation Board Instruction Manual Copyright © 2007–2013, Texas Instruments Incorporated 3 Bill of Material (BOM) www.ti.com Figure 2. Bottom Side 7 Bill of Material (BOM) Item Mfr. Part Number 1 551012810-002A 2 LMH1981 Qty Ref Designator LMH1981MTEVAL 1 TSSOP-14 1 U1 3 Cer Cap 0.1 µF 25V X7R 0805 2 C1,C2 4 Cer Cap 1 µF 10V X5R 0805 1 C4 5 Tant Cap 10 µF 10V TANT-A (3216) 1 C3 6 Res 10 kΩ 0.125W 1% 0805 1 R1 7 Res 75Ω 0.125W 1% 0805 1 R15 8 Res 100Ω 0.125W 1% 0805 6 R2-6,R8 9 Res 0Ω 0.125W 1% 0805 1 R7 Res 10 kΩ 0.125W 1% 0805 6 R9-14 Amphenol BNC Coaxial 1 J1 10 4 Part Description 11 112404 12 164-R104B-EX Kobiconn Banana Jack Black 1 J3 13 164-R104R-EX Kobiconn Banana Jack Red 2 J2 AN-1599 LMH1981 Evaluation Board Instruction Manual Remark OPEN SNLA094C – February 2007 – Revised April 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily performed. TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information published by TI regarding third-party products or services does not constitute a license 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 significant portions 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. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use of any TI components in safety-critical applications. In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and requirements. Nonetheless, such components are subject to these terms. No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties have executed a special agreement specifically governing such use. Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of non-designated products, TI will not be responsible for any failure to meet ISO/TS16949. Products Applications Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps DSP dsp.ti.com Energy and Lighting www.ti.com/energy Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial Interface interface.ti.com Medical www.ti.com/medical Logic logic.ti.com Security www.ti.com/security Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video RFID www.ti-rfid.com OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com Wireless Connectivity www.ti.com/wirelessconnectivity Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2013, Texas Instruments Incorporated
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