DEMO MANUAL DC1766A LTC6957-3/LTC6957-4 Low Phase Noise, Dual CMOS Output Buffer/Driver/Logic Converter Description Demonstration Circuit 1766A features the LTC®6957-3/ LTC6957-4, a low phase noise, dual CMOS output buffer/ driver/logic converter. The DC1766A provides SMA connectors for the differential inputs and the CMOS outputs. The inputs are terminated to on-board 50Ω resistors and the outputs present similar impedance. The DC1766A allows the user to take advantage of the shutdown and bandwidth selection features of the LTC6957. The DC1766A can operate with a single-ended or differential sine wave or square-wave input signal. Supply the DC1766A with 3.3V and it is ready to function. Or, the output can be powered from a lower voltage supply if a lower voltage CMOS driver is desired. The DC1766A gives 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. DC1766A Inputs and Outputs dc1766af 1 DEMO MANUAL DC1766A Quick Start Procedure The DC1766A is very straightforward to operate. Refer to Figure 1 for the following discussion. DC1766A Configuration 1.Apply a low-noise and low-spurious 3.3V supply between the V+ (E1) and GND (E2) turrets. 2.Make sure that jumper VDD (JP7) is at the V+ position if 3.3V CMOS output operation is desired. Otherwise, apply a voltage that is between 2.4V and 3.3V between the VDD (E4) and GND (E3) turrets, and move jumper VDD (JP7) to EXT position to operate the CMOS outputs at the voltage level supplied at the VDD turret. 3.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. 4.Connect either of the outputs (OUT1, J3 or OUT2, J4) to a high-speed scope, spectrum analyzer or a signal analyzer to start the evaluation of the LTC6957. 5.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. 6.Shut down an unused output by using jumper SD1 (JP3) to shutdown OUT1 or jumper SD2 (JP4) to shutdown OUT2. DC1766A Reconfiguration The DC1766A is flexible and allows the connectivity of a variety of input and output signal types. The DC1766A is configured as shown in the schematic diagram. However, the DC1766A 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 DC1766A. NOTE: The CMOS outputs of the DC1766A are ACcoupled and attenuated through two 100Ω resistors as shown in the DC1766A schematic diagram to present a 50Ω source impedance appropriate to connect to a 50Ω input impedance instrument. dc1766af 2 DEMO MANUAL DC1766A Assembly Options Table 1. DC1766A Assembly Options ASSEMBLY VERSION PART NUMBER OUTPUT TYPE DC1766A-A LTC6957HMS-3 In-Phase CMOS DC1766A-B LTC6957HMS-4 Complementary CMOS Layout Top Layer The top metal layer of the DC1766A is shown here as an example of good PCB layout for the LTC6957-3/LTC6957-4. dc1766af 3 DEMO MANUAL DC1766A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1766A General BOM 1 4 C1, C4, C6, C8 CAP., X7R, 0.01µF 50V 10%, 0603 NIC, NMC0603X7R103K50TRP 2 2 C13, C23 CAP., X7R, 0.1µF 50V 10%, 0603 TDK, C1608X7R1H104K 3 2 C14, C15 CAP., X5R, 1µF 25V 10%, 0603 TDK, C1608X5R1E105K 4 2 C16, C17 CAP., TANT, 22µF 10V, 3528 AVX, TPSB226K010R0400 5 4 E1, E2, E3, E4 TESTPOINT, TURRET 0.094" MILLMAX, 2501-2-00-80-00-00-07-0 6 5 JP1, JP2, JP3, JP4, JP7 JMP, HD1X3-079 SAMTEC, TMM-103-02-L-S 7 4 J1, J2, J3, J4 CONN., SMA 50Ω EDGE-LAUNCH E.F. JOHNSON, 142-0701-851 8 4 R1, R2, R20, R22 RES., CHIP, 100Ω 1% 0603 VISHAY, CRCW0603100RFKEA 9 0 R3, R4, R6, R11, R14 RES., OPT 0603 OPT 10 2 R7, R15 RES., CHIP, 49.9Ω 1% 0603 VISHAY, CRCW060349R9FKEA 11 4 R16, R17, R18, R19 RES., CHIP, 330k 1% 0603 VISHAY, CRCW0603330KFKEA 12 4 STAND-OFF, NYLON 0.500 KEYSTONE, 8833 (SNAP ON) 13 5 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G DC1766A General BOM DC1766A IC, LTC6957HMS-3, MS12 LINEAR TECH., LTC6957HMS-3 DC1766A GENERAL BOM DC1766A IC, LTC6957HMS-4, MS12 LINEAR TECH., LTC6957HMS-4 DC1766A-A 1 1 2 1 U1 DC1766A-B 1 1 2 1 U1 dc1766af 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 COMPLEMENTARY CMOS -B 5 1. ALL RESISTORS AND CAPACITORS ARE 0603. V+ 6 5 4 3 2 1 V+ 1 2 3 * R18 330k FILTB 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 12 7 8 9 10 11 V+ SCALE = NONE 3 2 1 JP4 SD2 L H 3 REV L H DATE: N/A SIZE VDD C17 22uF 10V 3528 VDD 2.4V - 3.45V E4 __ ECO 2 DESCRIPTION C4 0.01uF C1 0.01uF R22 100 R4 OPT VDD R20 100 R3 OPT VDD MICHEL A. SMA-R J4 LTC6957HMS-3 / -4 DEMO CIRCUIT 1766A 2 12/17/2012, 01:39 PM 1 SHEET 1 LOW PHASE NOISE, DUAL CMOS OUTPUT BUFFER/ DRIVER/ LOGIC CONVERTER IC NO. DATE OUT2 OUT1 12-17-12 SMA-R J3 APPROVED 1 3 OF 1 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R2 100 R1 100 PRODUCTION REVISION HISTORY TECHNOLOGY C23 0.1uF C15 1uF TITLE: SCHEMATIC 3 2 1 JP3 SD1 GND E3 V+ MICHEL A. KIM T. APPROVALS R19 330k SD2 GNDOUT OUT2 INGND VDD OUT1 SD1 R17 330k EXT V+ IN+ JP7 VDD V+ FILTA U1 R16 330k CUSTOMER NOTICE FILTB 3 H 2 1 L JP2 FILTA 3 H 2 1 L JP1 V+ VDD 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. LTC6957HMS-4 U1 LTC6957HMS-3 ASSY R15 49.9 C8 0.01uF IN-PHASE CMOS R14 OPT C13 0.1uF -A SMA-R V+ R11 OPT R7 49.9 C6 0.01uF NOTE: UNLESS OTHERWISE SPECIFIED * IN- J2 SMA-R R6 OPT C14 1uF + B C IN+ J1 V+ C16 22uF 3528 10V V+ V+ 3.15V - 3.45V GND E1 E2 4 + D 5 A B C D DEMO MANUAL DC1766A Schematic Diagram dc1766af 5 DEMO MANUAL DC1766A 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 dc1766af 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