DEMO MANUAL DC1765A LTC6957-1/LTC6957-2 Low Phase Noise, Dual LVPECL or LVDS Output Buffer/Driver/Logic Converter Description Demonstration Circuit 1765A features the LTC®6957-1/ LTC6957-2, a low phase noise, dual LVPECL or LVDS output buffer/driver/logic converter. The DC1765A provides 0.5" spaced SMA connectors for the differential inputs and outputs. The inputs are terminated to on-board 50Ω resistors. The LVPECL outputs of the DC1765A-A are individually biased through 130Ω resistors to ground and then AC-coupled. The transmission lines are 50Ω, making the outputs suitable to drive 50Ω input impedance instruments. The LVDS outputs of the DC1765A-B are terminated with 100Ω differential and are DC-coupled. The DC1765A allows the user to take advantage of the shutdown and bandwidth selection features of the LTC6957. The DC1765A can operate with a single-ended or differential sine wave or square-wave input signal. Supply the DC1765A with 3.3V and it is ready to function. The DC1765A offers extra component population options to make it compatible with different logic signal types. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Figure 1. DC1765A Inputs and Outputs dc1765af 1 DEMO MANUAL DC1765A Quick Start Procedure The DC1765A is very straightforward to operate. Refer to Figure 1 for the following discussion. DC1765A Configuration 1.Apply a low-noise and low-spurious 3.3V supply between the V+ (E1) and GND (E2) turrets. 2.Connect a low phase-noise (or jitter) single-ended or differential input signal to IN+ (J1) and/or IN– (J2) SMA connectors. Refer to the LTC6957 data sheet for appropriate input signal types and levels. DC1765A Reconfiguration The DC1765A is flexible and allows the connectivity of a variety of input and output signal types. The DC1765A is configured as shown in the schematic diagram. However, the DC1765A allows the installation of different input and output configurations to adapt to a variety of logic signals. Refer to the Applications Information section of the LTC6957 data sheet for all possible connectivity options that can be implemented by modifying the DC1765A. 3.Connect either of the outputs (OUT1, J3 and J4 or OUT2, J5 and J6) to a high-speed scope, spectrum analyzer or a signal analyzer to start the evaluation of the LTC6957. 4.Configure the input bandwidth of the LTC6957 with the use of FILTA (JP1) and FILTB (JP2) jumpers. Follow the instructions given in the LTC6957 data sheet to choose the correct bandwidth given an input signal. 5.Shut down an unused output by using jumper SD1 (JP3) to shutdown OUT1 or jumper SD2 (JP4) to shutdown OUT2. dc1765af 2 DEMO MANUAL DC1765A Assembly Options Table 1. DC1765A Assembly Options ASSEMBLY VERSION PART NUMBER OUTPUT TYPE DC1765A-A LTC6957HMS-1 LVPECL DC1765A-B LTC6957HMS-2 LVDS Layout Top Layer The top metal layer of the DC1765A is shown here as an example of good PCB layout for the LTC6957-1/LTC6957-2. dc1765af 3 DEMO MANUAL DC1765A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER C6, C8 CAP., X7R, 0.01µF 50V 10%, 0603 NIC, NMC0603X7R103K50TRP DC1765A General BOM 1 2 2 1 C13 CAP., X7R, 0.1µF 50V 10%, 0603 TDK, C1608X7R1H104K 3 1 C14 CAP., X5R, 1µF 25V 10%, 0603 TDK, C1608X5R1E105K 4 1 C16 CAP., TANT, 22µF 10V, 3528 AVX, TPSB226K010R0400 5 2 E1, E2 TESTPOINT, TURRET 0.094" MILLMAX, 2501-2-00-80-00-00-07-0 6 4 JP1, JP2, JP3, JP4 HEADER 1×3 079 SAMTEC, TMM-103-02-L-S 7 6 J1, J2, J3, J4, J5, J6 CONN., SMA 50Ω EDGE-LAUNCH E.F. JOHNSON, 142-0701-851 8 0 R6, R11, R14 RES., OPT 0603 OPT 9 2 R7, R15 RES., CHIP, 49.9Ω 1% 0603 VISHAY, CRCW060349R9FKEA 10 4 R16, R17, R18, R19 RES., CHIP, 330k 1% 0603 VISHAY, CRCW0603330KFKEA 11 4 SHUNTS FOR JP1-JP4 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G 12 4 STAND-OFF, NYLON 0.500 KEYSTONE, 8833 (SNAP ON) 1 DC1765A GENERAL BOM DC1765A DC1765A-A 1 2 4 Z1, Z2, Z3, Z4 CAP., X7R, 0.01µF 50V, 0603 NIC, NMC0603X7R103K50TRP 3 4 R1, R2, R3, R4 RES., CHIP, 130Ω, 0603 VISHAY, CRCW0603130RFKEA 4 0 R20, R21 RES., 0603 OPT 5 1 U1 IC, LTC6957HMS-1, MS12 LINEAR TECH., LTC6957HMS-1 DC1765A GENERAL BOM DC1765A DC1765A-B 1 1 2 4 Z1, Z2, Z3, Z4 RES., CHIP, 0Ω, 0603 VISHAY, CRCW06030000Z0EA 3 0 R1, R2, R3, R4 RES., 0603 OPT 4 2 R20, R21 RES., CHIP, 100Ω 5%, 0603 VISHAY, CRCW0603100RJNEA 5 1 U1 IC, LTC6957HMS-2, MS12 LINEAR TECH., LTC6957HMS-2 dc1765af 4 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B LVPECL LVDS -A -B ASSY SMA-R J2 SMA-R U1 R14 OPT R15 49.9 R7 49.9 LTC6957HMS-2 LTC6957HMS-1 V+ R11 OPT R6 OPT L H 0 OHM OPT * OUT2- IN- R18 330k FILTB 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 7 8 9 10 11 12 V+ SCALE = NONE 3 2 1 V+ MICHEL A. KIM T. APPROVALS R19 330k SD2 OUT2+ OUT1- GND OUT1+ IN+ SD1 R17 330k V+ FILTA CUSTOMER NOTICE 100 OHM 3 2 1 6 5 4 3 2 1 U1 R16 330k 3 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 0.01uF JP2 FILTB V+ V+ GND E2 FILTA 3 H 2 1 L JP1 Z1-Z4 R20-R21 C13 0.1uF C14 1uF OPT 1. ALL RESISTORS AND CAPACITORS ARE 0603. 5 C16 22uF 3528 10V 130 OHM R1-R4 C8 0.01uF C6 0.01uF NOTE: UNLESS OTHERWISE SPECIFIED * IN- IN+ J1 V+ V+ V+ 3.15V - 3.45V E1 4 + C D 5 JP4 L H 3 DATE: N/A SIZE * R21 * R20 * R4 * R3 * R2 * R1 Z4 Z3 OUT2+ OUT2- OUT1- SMA-R J6 SMA-R J5 SMA-R J4 SMA-R J3 MICHEL A. APPROVED 1 DATE OUT2+ OUT2- OUT1- OUT1+ 08-16-12 2 08/16/2012, 06:45 PM IC NO. 1 SHEET 1 OF 1 3 REV. LOW PHASE NOISE, DUAL LVPECL OR LVDS OUTPUT BUFFER / DRIVER / LOGIC CONVERTER LTC6957HMS-1 / -2 DEMO CIRCUIT 1765A 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only * * Z2 * Z1 * OUT1+ DESCRIPTION PRODUCTION REVISION HISTORY TECHNOLOGY REV TITLE: SCHEMATIC 3 2 1 L H SD2 JP3 SD1 __ ECO 2 A B C D DEMO MANUAL DC1765A Schematic Diagram dc1765af 5 DEMO MANUAL DC1765A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc1765af 6 Linear Technology Corporation LT 0213 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013