DEMO MANUAL DC1642A LTM9003 12-Bit Digital Predistortion Receiver Subsystem Description Demonstration circuit DC1642A is an evaluation board featuring Linear Technology Corporation's LTM(R)9003 12-Bit predistortion receiver subsystem. DC1642A demonstrates good circuit layout techniques and recommended external circuitry for optimal system performance. DC1642A comes with Linear Technology's 12-bit LTM9003 receiver subsystem installed. The board includes output LVDS buffers. DC1642A plugs into the DC890 data acqui- sition demo board using an FT149 adapter card and the output can be easily analyzed with Linear Technology's PScopeTM data processing software, which is available for no charge on our website at http://www.linear.com. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Module, Linear Technology and the Linear logo are registered trademarks and PScope is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. quick start procedure Validating the performance of the LTM9003 is simple with DC1642A, and requires only two input sources, a clock source, a computer, and a lab power supply. Refer to Figure 1 for proper board evaluation equipment setup and follow the procedure below: 1.Connect the power supply as shown in Figure 1. There are on-board low-noise voltage regulators that provide the supply voltage for the DC1642A. The entire board and all components share a common ground. The power supply should still be a low-noise lab power supply capable of supplying at least 1A. 2. Provide an encode clock to the ADC via SMA connector J7. Use a low-phase-noise clock source such as a filtered RF signal generator or a high-quality clock oscillator. 3.Apply an RF input signal to the board. For best results, use a low distortion, low noise signal generator with sufficient filtering to avoid degrading the performance of the receiver. 4.Apply an LO input signal to the board. Note that the difference in frequency between this signal and the RF signal will be the IF frequency resulting at the IF filter and ADC input. 5.Observe the ADC output with the FT149 adapter card connected to the DC890, a USB cable, a Windows computer, and Linear Technology's PScope data processing software. Note that the DC890 will also require an external 6V/1A power supply when receiving LVDS outputs. Note: Similar to having a noisy input, a high-jitter (phase noise) encode clock will degrade the signal-to-noise ratio (SNR) of the system. Order Options Table 1. DC1642A Variants DC1624 VARIANTS PART NUMBER SFDR SUPPLY VOLTAGE BANDPASS FILTER 1624A-AA LTM9003A-AA 58.8dB 2.5V ADC, 3.3V Amplifier, 3.3V Mixer 184MHz Center, 125MHz Bandwidth 1624A-AB LTM9003A-AB 62.4dB 2.5V ADC, 3.3V Amplifier, 5V Mixer 184MHz Center, 125MHz Bandwidth dc1642af 1 DEMO MANUAL DC1642A quick start procedure Signal Generator HP 8644B or Equivalent Signal Generator HP 8644B or Equivalent BPF Power Supply +5V at 200mA * Power Supply +3.3V at 1A BPF To FT149+ DC890B RF Signal Generator (HP 8644B) or Other Low Phase Noise Clock Source (e.g. DC1216) BPF * Note: Even a high-quality signal synthesizer will still have noise and harmonics that should be attenuated with a low-pass or band-pass filter. For good-quality high order filters, see TTE, Lark Engineering, or equivalent. Figure 1. Proper Measurement Equipment Setup Table 2. DC1642A Connectors and Jumpers REFERENCE FUNCTION J2 (Mode) Output Format and Clock Duty Stabilizer Pin. Default is VDD. J3 (SHDN/OE) Enables/Disables the ADC. Default is ON. J4 (Sense) Reference Input to Adjust the Full-Scale Range of the DC1642A. Default is VDD. J5 (RF) Board RF Signal Input. Impedance-matched to 50 for use with lab signal generators. J6 (Mixer/Amplifier Enable) Enables/Disables the RF Mixer and Amplifier. Default is ON. J7 (CLK) Board Clock Input. Impedance-matched to 50. Drive with a low-phase-noise clock oscil-lator or filtered sine wave signal source. J9 (LO) Board LO Signal Input. Impedance-matched to 50 for use with lab signal generators. TP1 (External Reference) Reference Input to Adjust the Full-Scale Range of the LTM9003. Connects to the SENSE pin; by default, tied to VDD for internal reference. TP2 (GND) DC Ground. TP3 (3.3V) DC Supply Input (3.3VDC). TP4 (GND) DC Ground. TP5 (5V) DC Supply Input (5VDC). dc1642af 2 DEMO MANUAL DC1642A quick start procedure Other Board Circuitry Device U1 is an EEPROM device that is used by the PScope software to identify the board and apply the correct settings for the data collection. Using PScope Software PScope, downloadable from Linear Technology's website at http://www.linear.com/software, processes data from the DC890 QuikEval II data acquisition board and displays FFT and signal analysis information on the computer screen. The on-board EEPROM U1 should enable automatic board detection and auto-configuration of the software. From the Configure menu in the toolbar, uncheck "Autodetect Device." The default settings for DC1642A are shown in Figure 2. Figure 2. Entering the Correct Device Information for Your ADC. Select the Correct Parameters for the DC1642A. Under Normal Conditions, PScope Should Automatically Recognize the Board and Adjust the Software Settings Accordingly dc1642af 3 DEMO MANUAL DC1642A parts list ITEM QTY REFERENCE LTM9003CV, Demo Board #1642A 1 1 C4 2 4 C1, C2, C10, C44 3 10 C19, C27-C32, C34, C35, C36 4 1 C45 5 4 C5, C6, C8, C9 6 2 C3, C7 7 0 C37, C42 8 1 C39 9 1 C43 10 1 J1 11 4 J2, J3, J4, J6 12 3 J5, J7, J9 13 1 J8 14 1 L1 15 1 L5 16 0 R41 17 0 R52 18 3 R3, R13, R14 19 1 R50 20 6 R37, R42-R46 21 17 R17-R23, R28, R30-R35, R38-R40 22 4 R6, R8, R53, R54 23 3 R10, R24, R48 24 2 R12, R49 25 1 R47 26 3 R4, R5, R51 27 2 R1, R2 28 2 R7, R11 29 5 R25, R26, R27, R29, R36 30 1 R9 31 1 T2 32 5 TP1-TP5 33 1 U1 34 2 U3, U4 35 2 U5, U10 36 6 XJP2, XJP3, XJP4, XJP6 (See Drawing) 37 3 (Stand-Off) 38 2 LTM9003CV-AA, Demo Board #1642A-AA 1 1 DC1642AA 2 0 R15 3 1 R16 4 1 U2 5 1 LTM9003CV-AB, Demo Board #1642A-AB 1 1 DC1642AA 2 1 R15 3 0 R16 4 1 U2 5 1 PART DESCRIPTION MANUFACTURER/PART NUMBER Capacitor, NPO, 8.2pF, 50V, 0.25pF, 0402 Capacitor, X5R, 0.01F, 16V, 0.1, 0402 Capacitor, X5R, 0.1F, 10V, 0.1, 0402 Capacitor, X5R, 10F, 6.3V, 0.2, 0805 Capacitor, X5R, 4.7F, 10V, 0.2, 0805 Capacitor, X7R, 0.1F, 16V, 0.1, 0603 Capacitor, DNI Capacitor, NPO, 0.5pF, 50V, 0.25pF, 0402 Capacitor, NPO, 1pF, 50V, 0.25pF, 0402 Connector, HSMC, Mezzanine Header, 3x2, 2mm Connector, SMA Female Edge Mount Header, 2x1, 2mm Inductor, 3.9nH, 5%, 0402 Inductor, 2.7nH, 5%, 0402 Resistor, DNI Resistor, 0.01, 1/16W, 0603 Resistor, 0 Jumper, 0805 Resistor, 0 Jumper, 1206 Resistor, 10, 0.01, 1/4W, 1206 Resistor, 100, 0.01, 39833, 0201 Resistor, 1000, 0.01, 1/10W, 0603 Resistor, 100k, 0.01, 39829, 0402 Resistor, 10k, 0.01, 39829, 0402 Resistor, 32.4k, 0.01, 39829, 0402 Resistor, 4.99, 0.01, 39829, 0402 Resistor, 49.9, 0.01, 39829, 0402 Resistor, 499, 0.01, 1/10W, 0603 Resistor, 4990, 0.01, 39829, 0402 Resistor, 64.9k, 0.01, 39829, 0402 XFRMR, 1:1, SMT, SM-22 Turret IC, Serial_EEPROM, TSSOP8 IC, RPTR, LVDS, OCTAL, SMT, TSSOP IC, VREG, ADJ, 500MA, DFN SHUNT Stand-Off, Nylon, 0.25" Stencil, Component & Solder Sides AVX/04025A8R2CAT2A AVX/0402YC103KAT AVX/0402ZD104KAT AVX/08056D106MAT AVX/0805ZD475MAT AVX/0603YC104KAT General BOM Resistor, DNI Resistor, 0 Jumper, 0805 I.C., Module Printed Circuit Board General BOM Resistor, 0 Jumper, 0805 Resistor, DNI I.C., Module Printed Circuit Board AVX/04025A0R5CAT2A AVX/04025A1R0CAT2A Samtec/ASP-122952-01 Samtec/TMM-103-02-L-D E.F.JOHNSON/142-0701-851 Samtec/TMM-102-02-L-S Coilcraft/0402CS-3N9XJLW Coilcraft/0402CS-2N7XJLW Vishay, CRCW0603XXXX Vishay, CRCW08050000ZOEA NIC, NRC12ZOTR Vishay, CRCW120610R0FNEA Vishay, CRCW0201100RFNED Vishay, CRCW06031K00FKEA Vishay, CRCW0402100KFKED Vishay, CRCW040210K0FKED Vishay, CRCW040232K4FKED Vishay, CRCW04024R99FKED Vishay, CRCW040249R9FKED Vishay, CRCW0603499RFKEA Vishay, CRCW04024K99FKED Vishay, CRCW040264K9FKED Macom/MABA-007159-000000 Mill_Max/2308-2 Microchip/24LC025-I_ST Fairchild/FIN1108 Linear Technology/LT1763CDE Samtec 2SN-BK-G Keystone/ 8831(Snap On) Vishay CRCW08050000Z0EA Linear Tech. Corp. LTM9003CV-AA Demo Circuit 1642A Vishay CRCW08050000Z0EA Linear Tech. Corp. LTM9003CV-AB Demo Circuit 1642A dc1642af 4 DEMO MANUAL DC1642A Schematic Diagram dc1642af 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. 5 DEMO MANUAL DC1642A 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 (c) 2004, Linear Technology Corporation dc1642af 6 Linear Technology Corporation LT 0411 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2011