LMH1981EVAL

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. 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