DEMO MANUAL DC1216 High Speed ADC Clock Source Description Demonstration circuit 1216 is a low jitter, low noise clock source for demonstrating high speed ADCs. Each assembly includes a LDO regulator and a high precision VCXO. Functionally, this circuit uses a linear regulator to provide a clean 5V to a VCXO at a fixed frequency. This VCXO is capable of providing a signal which is clean enough to produce data sheet performance from high speed ADCs. It is designed to have 50Ω output impedance, but has provision for other termination resistors if needed. This circuit also is a model for the clock source of ADCs. It shows how to properly implement a VCXO correctly to drive the clock of an ADC. It can be used with a DC1075 to produce lower clock frequencies. 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. Table 1. DC1216A Variants DC1216A VARIANTS VCXO PART NUMBER OUTPUT FREQUENCY DC1216A-A Crystek 601964 100MHz DC1216A-B Crystek 602017 122.88MHz DC1216A-C Crystek 602019 80MHz DC1216A-D Crystek 601964 100MHz Note: DC1216A-A, DC1216A-B and DC1216A-C are optimized to be used with the data converter demo boards. The DC1216A-D is optimized to drive the synthesizer demo boards. dc1216f 1 DEMO MANUAL DC1216 Quick Start Procedure SETUP The DC1216 requires an external voltage of 5V. This voltage can be as high as 9V. The SMA connector should be connected to the ADC directly, or through a clock divider circuit such as the DC1075A. No external filter is required. 5V TO 9V OUTPUT FREQUENCY DEPENDENT ON CRYSTAL FREQUENCY CONNECT SMA DIRECTLY TO HIGH SPEED ADC DEMO BOARD dc1216f 2 DEMO MANUAL DC1216 Parts List DEMO BOARD 1216A ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 1 B1 BEAD, 47Ω IMPEDANCE 0603 MURATA, BLM18BB470SN1D 2 1 C1 CAP, TANT, 100µF, 10V, 20% 6032 AVX, TPSC107M010R0200 3 1 C2 CAP, X5R, 1µF, 10V, 10% 0603 AVX, 0603ZD105KAT2A 4 1 C4 CAP, X7R, 0.1µF, 25V, 10% 0603 AVX, 06033C104KAT2A 5 2 C6, C5 CAP, X7R, 0.01µF, 50V, 10% 0603 AVX, 06035C103KAT2A MILL-MAX, 2501-2-00-80-00-00-07-0 6 2 E3, E5 TESTPOINT, TURRET, 0.094" 7 0 E1, E2, E4 (OPT) TESTPOINT, TURRET, 0.094" 8 1 J1 CON, SMA-EDGE, 50Ω, PLUG AMPHENOL, 901-9895-RFX 9 1 J2 AUX POWER CONNECTOR, B03B-PASK JST, B03B-PASK (LF)(SN) 10 2 R1, R2 RES, CHIP, 4.99k, 1/10W, 1% 0603 VISHAY, CRCW06034K99FKEA 11 0 R3, R5 (OPT) RES, 0603 12 1 R6 RES, CHIP, 1k, 1/10W, 5% 0603 VISHAY, CRCW06031K00JNEA 13 1 U1 IC LT1761ES5-3.3, SOT23-S5 LINEAR TECHNOLOGY, LT1761ES5-3.3#PBF 14 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON) 15 1 STENCIL STENCIL 1216A dc1216f 3 DEMO MANUAL DC1216 Parts List DEMO BOARD 1216-A ITEM QTY 1 1 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1216A DC1216A GENERAL BOM GENERAL BOM 2 1 Y1 CRYSTAL 601964 CRYSTEK, 601964 3 1 R4 RES, CHIP, 5.1Ω, 1/10W, 5% 0603 VISHAY, CRCW06035R10JNEA 4 0 C3 OPT 5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1216A DEMO BOARD 1216-B ITEM QTY 1 1 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1216A DC1216A GENERAL BOM GENERAL BOM 2 1 Y1 CRYSTAL 602017 CRYSTEK, 602017 3 1 R4 RES, CHIP, 5.1Ω, 1/10W, 5% 0603 VISHAY, CRCW06035R10JNEA 4 0 C3 OPT 5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1216A REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1216A DC1216A GENERAL BOM GENERAL BOM DEMO BOARD 1216-C ITEM QTY 1 1 2 1 Y1 CRYSTAL, 602019 CRYSTEK, 602019 3 1 R4 RES, CHIP, 5.1Ω, 1/10W, 5% 0603 VISHAY, CRCW06035R10JNEA 4 0 C3 OPT 5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1216A REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1216A DC1216A GENERAL BOM GENERAL BOM DEMO BOARD 1216-D ITEM QTY 1 1 2 1 C3 CAP, X5R, 4.7µF, 10V, 10% 0603 TDK, C1608X5R1A475K 3 1 R4 RES, CHIP, 100Ω, 1/10W, 5% 0603 VISHAY, CRCW0603100RJNEA 4 1 Y1 CRYSTAL, 601964 CRYSTEK, 601964 5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1216A dc1216f 4 E3 GND 3 2 1 E5 B03B-PASK J2 AUX PWR VIN 5V SHDN C2 1uF E4 (opt.) R6 1K SHDN IN BYP OUT GND VREF R3 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. Crystek, 602019 Crystek, 601964 DC1216A-C DC1216A-D B1 + C1 100uF 10V BEAD 47ohm DATE 1/17/07 1/17/07 Wednesday, October 03, 2012 APPROVED APPROVALS DRAWN June Wu ENGINEER Clarence Mayott CHECKED 4.7uF OPT 5 ohms 100 ohms OPT OPT 5 ohms C3 R2 4.99K R1 4.99K 5 ohms R4 C5 0.01uF A1 CONTRACT NO. 100MHz, PLL Reference 80MHz 122.88MHz 100MHz Freq. (MHz) CLKOUT * C3 Crystek, 601964 Crystek, 602017 C4 0.1uF opt. DC1216A-A Y1 4 5 E2 (opt.) E1 (opt.) DC1216A-B ASSEMBLY TYPE * VERSION TABLE 3 1 U1 LT1761ES5-3.3 GND 2 ECO REV Y1 * 0.01uF C6 * R4 TECHNOLOGY 3 1 R5 opt. FILENAME: DWG NO J1 DATE SHEET DC1216A 1 OF CLKOUT 10-03-12 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 MICHEL A. High Speed ADC Clock Source OUT Volt Cont. CAGE CODE GND Vdd SCALE: SIZE TITLE 2 4 ADD "-D" VERSION REVISION HISTORY APPROVED DESCRIPTION 1 A1 REV * DEMO MANUAL DC1216 Schematic Diagram dc1216f 5 DEMO MANUAL DC1216 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 dc1216f 6 Linear Technology Corporation LT 0313 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013