LTC2000 LINER
Document overview
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Technical content
DESCRIPTION
LTC2000, LTC2000A 16-, 14-, 11-Bit, 2.5Gsps to 2.7Gsps DACs Demonstration circuit 2085 supports the LT C®2000 and LTC2000A, a high speed, high dynamic range family of DACs. It was specially designed for applications that re - quire differential DC coupled outputs. DC2085 supports the complete family of the LTC2000 including 16, 14 and 11 bit parts. For all the variations see Table 1. L, L T , L TC, L TM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY The circuitry on the analog outputs is optimized for analog frequencies from DC-1.08GHz. Design files for this circuit board are available at http://www.linear.com/demo/DC2085 Specifications are at TA = 25°C PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Voltage – DC2085 This supply must provide up to 800mA 4.8 5.0 5.2 V Sampling Frequency (Sample Clock Frequency) 300 2500 or 2700 MHz Sample Clock Level (Single-Ended) Use a 50Ω Source 0 15 dBm LVDS Inputs Differential Input Voltage Range Common Mode Voltage Range ±0.2 0.4 ±0.6 1.8 V V Table 1. DC2085 Variants
Figure 1. DC2085 Setup (zoom for details)
J2 & J3: Differential T rigger Input. Apply a signal to J2 from a 50Ω driver. Absorptive filters are required for data sheet performance. Use J2 and J3 if the trigger is a differential signal. J4: Sample Clock Input. Apply a clock signal to this SMA connector from a 50Ω driver. A 0dBm clock source should be sufficient, but for best phase noise and jitter performance, use the highest possible amplitude and slew rate, up to 15dBm. J5 & J6: Differential Output Signals. These SMAs provide access to the differential outputs of the DAC. The output impedance is designed to be 50Ω at each SMA, or 100Ω differential. Connect an external balun or combiner to these pins to drive a single-ended spectrum analyzer. Linear Technology has various coupon boards for specific frequencies and applications. More information is available at www.linear.com. J8: SYNC. This SMA is to provide access to the sync pin of the LT8614. It is not used in normal use. Turrets +5V: Positive Input Voltage for the DAC and Digital Circuits. This voltage feeds a series of regulators that supply the proper voltages for the DAC. The voltage range for this turret is 4.8V to 5.2V. Note: For close-in phase noise plots, driving this voltage is not ideal. There is a known 20kHz noise hump in the spectrum that is generated by the regulators. For the best phase noise performance, back drive the onboard regulators with the provided turrets from a low noise supply. GND: Ground Connection. This demo board has only a single ground plane. This turret should be tied to the GND terminal of the power supply being used. SVDD3V0: Optional 3.0 V Input. This pin is connected directly to the SVDD pin of the DAC. It requires a supply that can deliver up to 100mA. Driving this pin will shut down the onboard regulator. AVDD3V3: Optional 3.3 V Input. This pin is connected directly to the AVDD3V3 pin of the DAC. It requires a supply that can deliver up to 200mA. Driving this pin will shut down the onboard regulator. DVDD3V3: Optional 3.3 V Input. This pin is connected directly to the DVDD3V3 pin of the DAC. It requires a supply that can deliver up to 50mA. Driving this pin will shut down the onboard regulator. AVDD1V8: Optional 1.8 V Input. This pin is connected directly to the AVDD1V8 pin of the DAC. It requires a supply that can deliver up to 1A. Driving this pin will shut down the onboard regulator. DVDD3V3: Optional 1.8 V Input. This pin is connected directly to the DVDD1V8 pin of the DAC. It requires a supply that can deliver up to 500mA. Driving this pin will shut down the onboard regulator. VP1: This is a test point that is at the output of the on - board switching regulator. It is meant for test purposes. It can also be driven to 2.5V to shut down the output of the switching regulator. TSTP & TSTN: These pins are tied directly to the TSTP and TSTN pins of the DAC. They can be used to measure the internal temperature and timing of the LVDS inputs. FSADJ: This is an optional pin that is tied directly to the FSADJ pin of the DAC. It can be used to set the full-scale output current of the DAC. In normal operation this pin is tied to GND through 500Ω to set a current of 40mA at the output. REFIO: This pin is tied directly to the REFIO pin of the DAC and is used to set the reference voltage for the DAC. Normally it is internally set to 1.25V but can be overdriven with an external voltage from 1.1V to 1.4V. Jumpers The DC2085 demonstration circuit should have the fol - lowing jumper settings as default positions. JP1: PD. In the RUN position this pin results in normal operation of the DAC. In the SHDN position the DAC is powered down. (Default: RUN or up) JP2: SPI and JTAG. This jumper selects how the FPGA is programmed. In the SPI position the FPGA is programmed from the onboard FTDI chip and the L TDACGen software. In
the L TDACGen software installed. the DAC is routed through these connectors. the Altera board to the provided power supply.
- Connect the USB cable to J7.
- Connect any optional output board to J5 and J6.
- Turn on the voltage to the Altera board.
TDACGen software and hit connect. Figure 2. L TDACGen Connected to FPGA
designed to maximize the performance of the LTC2000. analyzer through a balun or other combiner. ended to differential translation. be driven with a very low jitter signal generator source. Figure 3. Default Frequency
Figure 4. DC2085 Results. Close-In (Top) and Wideband (Bottom)
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 13 C1, C25, C26, C29, C31, C32, C33, C34, C35, C36, C37, C71, C72 CAP., X7R, 0.1µF, 16V 10% 0402 AVX, 0402YC104KAT2A 2 4 C2, C3, C8, C19 CAP., NPO, 0.01µF, 25V 5% 0603 TDK, C1608C0G1H103J 3 9 C4, C6, C9, C11, C14, C18, C67, C68, C69 CAP., X7R, 1µF, 16V 10% 0603 AVX, 0603YC105KAT2A 4 5 C5, C7, C10, C12, C15 CAP., TANT., 47µF, 16V 10% 7343 AVX, TAJD476K016RNJ 5 4 C13, C16, C27, C28 CAP., X5R, 4.7µF, 16V 20% 1206 TDK, C3216X5R1C475M 6 2 C17, C40 CAP., X5R, 10µF, 10V 20% 0603 AVX, 0603ZD106MA2T 7 1 C20 CAP., C0G, 4.7pF, 50V ± 0.25pF 0603 AVX, 06035A4R7CAT2A 8 2 C21, C24 CAP., X7R, 0.1µF, 16V 10% 0603 TDK, C1608X7R1C104K 9 1 C22 CAP., X7R, 1µF, 25V 10% 0603 TDK, C1608X7R1E105K 10 2 C23, C70 CAP., X7R, 47µF, 10V 10% 1210 MURATA, GRM32ER71A476KE15L 11 1 C30 CAP., X5R, 3.3µF, 16V 10% 0603 TDK, C1608X5R1C335K 12 2 C38, C39 CAP., COG, 27pF, 50V 5% 0402 TDK, C1005C0G1H270J 13 2 C41, C42 CAP., COG, 100pF, 25V 5% 0201 TDK, C0603C0G1E101J 14 1 C43 CAP., X5R, 0.01µF, 16V 10% 0402 MURAT A, GRM155R61C103KA01D 15 1 C44 CAP., X7R, 47nF, 25V 10% 0402 MURATA, GRM155R71E473KA88D 16 9 C45, C48, C49, C53, C54, C58, C61, C62, C64 CAP., X5R, 100µF, 6.3V 20% 1206 TDK, C3216X5R0J107M 17 10 C46, C50, C51, C52, C55, C56, C57, C59, C60, C63 CAP., X7S, 2.2µF, 4V 20% 0306 MURATA, LLL185C70G225ME01L 18 1 C47 CAP., COG, 10pF, 25V 5% 0201 MURATA, GRM0335C1E100JA01D 19 0 C65 CAP., OPT, 0402 OPTION 20 1 C66 CAP., NP0, 1pF, 25V ±.25pF 0402 AVX, 04023A1R0CAT2A 21 2 C73, C74 CAP., X7R, 4.7µF, 50V 10% 1206 MURATA, GRM31CR71H475KA12L 22 1 C75 CAP., X7R, 10µF, 50V 10% 1210 MURATA, GRM32ER71H106KA12L 23 2 C76, C77 CAP., X5R, 1µF, 50V 10% 0603 MURATA, GRM188R61H105KAALD 24 1 D1 DIODE, TVS, 70V,SMA DIODES INC./ ZETEX, SMAT70A-13-F 25 1 D2 DIODE, TVS, 24V,SMA DIODES INC./ ZETEX, SMAJ24A-13-F 26 1 D3 LED, RED, WATERCLEAR, 0805 WÜRTH, 150080RS75000 27 10 E1, E2, E3, E5–E11 TEST POINT, TURRET, .061, PBF MILL-MAX, 2308-2-00-80-00-00-07-0 28 2 E4, E12 TEST POINT, TURRET, .094, PBF MILL-MAX, 2501-2-00-80-00-00-07-0 29 2 JP1, JP2 HEADER, 3 PIN, .079 SULLINS, NRPN031PAEN-RC 30 1 J1 HEADER, 2×7 DUAL ROW MOLEX 87831-1420 31 3 J2, J3, J8 CON., SMA JACK, STRAIGHT, THRU-HOLE AMPHENOL CONNEX, 132134 1 J4 CON., SMA PCB TOP MOUNT AEP, 9650-1113-005 33 2 J5, J6 CON., SMA 50Ω EDGE-LAUNCH EMERSON, 142-0701-851 34 1 J7 CONNECTOR, USB TYPE B, RIGHT ANGLE PCB MOUNT FCI, 61729-0010BLF 35 1 J9 HEADER, 2X5, 0.100 SAMTEC, TSW-105-07-L-D 36 2 J10, J11 CONNECTOR, HSMC SAMTEC, ASP-122952-01
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 37 6 L1, L2, L3, L4, L6, L7 FERRITE BEAD, 33Ω AT 100mHz, 1206 MURATA, BLM31PG330SN1L 38 1 L5 INDUCTOR, 2.2µH, 20% HIGH CURRENT, SMT VISHAY, IHLP2020BZER2R2M11 39 1 L8 INDUCTOR, CERAMIC CHIP, 1nH, 5%, 0402 COILCRAFT, 0402CS-1N0XJLU 40 1 L9 FERRITE BEAD, 30Ω AT 100mHz, 0805 TDK, MPZ2012S300A 41 1 L10 INDUCTOR, 6.8µH, 20% HIGH CURRENT, SMT VISHAY, IHLP2020BZER6R8M11 42 2 MTG5, MTG6 STANDOFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON) 43 2 Q1, Q2 TRANSISTOR, N-CH. POWER MOSFET, SOIC 8L FAIRCHILD, FDS8870 44 6 R1, R2, R3, R13, R17, R30 RES., CHIP, 1k, 1/16W, 5% 0402 VISHAY, CRCW04021K00JNED 45 1 R4 RES., CHIP, 4.7k, 1/16W, 5% 0402 YAGEO, RC0402JR-074K7L 46 4 R5, R14–R16 RES., CHIP, 10k, 1/16W, 5% 0402 YAGEO, RC0402JR-0710KL 47 2 R6, R8 RES., CHIP, 2k, 1/16W, 5% 0402 VISHAY, CRCW04022K00JNED 48 0 R7, R10, R23, R24, R25, R27, R28, R36, R37, R38, R39, R43, R62, R63 RES., CHIP, OPT, 0402 OPTION 49 1 R9 RES., CHIP, 39Ω, 1/16W, 1% 0402 VISHAY, CRCW040239R0FKED 50 1 R11 RES., CHIP, 0Ω JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED 51 1 R12 RES., CHIP, 12k, 1/16W, 5% 0402 VISHAY, CRCW040212K0JNED 52 1 R18 RES., CHIP, 2.2k, 1/16W, 5% 0402 VISHAY, CRCW04022K20JNED 53 2 R19, R20 RES., CHIP, 3.24k, 1/16W, 1% 0402 VISHAY, CRCW04023K24FKED 54 1 R21 RES., CHIP, 1k, 1/16W, 1% 0402 YAGEO, RC0402FR-071KL 1 R22 RES., CHIP, 7.15k, 1/16W, 1% 0402 VISHAY, CRCW04027K15FKED 56 2 R26, R29 RES., CHIP, 49.9Ω, 1/6W, 1% 0201 VISHAY, CRCW020149R9FNED 57 7 R31-R35, R41, R42 RES., CHIP, 10Ω, 1/16W, 1% 0402 VISHAY, CRCW040210R0FKED 58 10 R40, R44, R46, R47, R48, R57, R58, R59, R60, R61 RES., CHIP, 50Ω, HIGH FREQ., 1/20W, 0.1% 0402 VISHAY, FC0402E50R0BST1 59 1 R45 RES., CHIP, 499Ω, 1/16W, 1% 0402 VISHAY, CRCW0402499RFKED 60 1 R49 RES., CHIP, 41.2k, 1/10W, 1% 0603 VISHAY, CRCW060341K2FKEA 61 1 R50 RES., CHIP, 309k, 1/10W, 1% 0603 VISHAY, CRCW0603309KFKEA 62 1 R51 RES., CHIP, 243k, 1/10W, 1% 0603 VISHAY, CRCW0603243KFKEA 63 1 R52 RES., CHIP, 50Ω, 1/8W, 5% 0603 VISHAY, FC0603E50R0JST1 64 1 R53 RES., CHIP, 560Ω, 1/10W, 5% 0603 VISHAY, CRCW0603560RJNEA 65 1 R54 RES., CHIP, 10k, 1/10W, 1% 0603 VISHAY, CRCW060310K0FKEA 66 2 R55, R56 RES., CHIP, 20Ω, 1/16W, 1% 0402 VISHAY, CRCW040220R0FKED 67 1 T1 TRANSFORMER, BALUN ANAREN, B0430J50100AHF 68 1 U2 IC, USB TO MUL TIPURPOSE UART/FIFO, TQFP FTDI, FT 2232HL 69 1 U3 IC, QUAD MUX/DEMUX, TSSOP-16 FAIRCHILD, FST3257MTCX 70 1 U4 IC, EEPROM 1kBIT 3MHZ, 8TSSOP MICROCHIP, 93LC46C-I/ST 71 1 U5 IC, MICROPOWER REGULATOR, SO-8 LINEAR TECHNOLOGY, LT1763CS8-3#PBF 72 2 U6, U7 IC, MICROPOWER REGULATOR, SO-8 LINEAR TECHNOLOGY, LT1763CS8-3.3#PBF 73 1 U8 IC, BUCK REGULATOR, QFN LINEAR TECHNOLOGY, LT8614IUDC#PBF 74 1 U9 IC, VOL TAGE REFERENCE, MSOP LINEAR TECHNOLOGY, LTC6655CHMS8-2.048#PBF
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 75 2 U10, U11 I.C., LOW DROPOUT REGULATOR, 3×3mm, DFN LINEAR TECHNOLOGY, LT3080EDD#PBF 76 1 U12 I.C., 80V IDEAL DIODE, DFN-6L LINEAR TECHNOLOGY, LTC4359HDCB-#TRPBF 77 2 XJP1, XJP2 SHUNT, 2mm SAMTEC, 2SN-BK-G 78 1 Y1 CRYSTAL, 12.0 MHz, SMT ABRACON, ABMM2-12.000MHZ-E2-T DC2085A-A Required Circuit Components 1 1 GENERAL BOM DC2085A 2 1 U1 IC, 16-BIT 2.5Gsps DAC LINEAR TECHNOLOGY, LTC2000IY-16 DC2085A-B Required Circuit Components 1 1 GENERAL BOM DC2085A 2 1 U1 IC, 14-BIT 2.5Gsps DAC LINEAR TECHNOLOGY, LTC2000IY-14 DC2085A-C Required Circuit Components 1 1 GENERAL BOM DC2085A 2 1 U1 IC, 11-BIT 2.5Gsps DAC LINEAR TECHNOLOGY, LTC2000IY-11 DC2085A-D Required Circuit Components 1 1 GENERAL BOM DC2085A 2 1 U1 IC, 16-BIT 2.7Gsps DAC LINEAR TECHNOLOGY, LTC2000AIY-16 DC2085A-E Required Circuit Components 1 1 GENERAL BOM DC2085A 2 1 U1 IC, 14-BIT 2.7Gsps DAC LINEAR TECHNOLOGY, LTC2000AIY-14 DC2085A-F Required Circuit Components 1 1 GENERAL BOM DC2085A 2 1 U1 IC, 11-BIT 2.7Gsps DAC LINEAR TECHNOLOGY, LTC2000AIY-11
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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. Figure 5. DC2085 Demo Circuit Schematic (Sheet 1)
- ALL RESISTORS ARE SIZE 0402, U.O.N.
- REFER TO PAGE 4 FOR LTC2000 POWER CONNECTIONS.
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV C. MAYOTTPRODUCTION3- DESCRIPTION DATEAPPROVEDECO REV C. MAYOTTPRODUCTION3- DESCRIPTION DATEAPPROVEDECO REV C. MAYOTTPRODUCTION3- R41 10 R61 0402 R33 10 R31 10 C41 100pF COG 0201 R42 10 C42 100pF COG 0201 R62 OPT 0402 R46 0402 R48 0402 R59 0402 R40 0402 VUNREG 1 GND 3 MISO 5MOSI/SDA 7 EESDA 9 EESCL 11 GND 13 VCCIO 2 SCK/SCL 4CS 6 GND 8 EEVCC 10 EEGND 12 GPIO 14 R23 OPT 0402 C40 10uF R24 OPT 0402 C47 10pF 0201 COG GND GND IN ANAREN XINGER R38 OPT R26 49.9 0201 R32 10 R35 10 E11 R37 OPT R29 49.9 0201 C65 OPT 0402 L8 1nH 1 2 R63 OPT 0402 R60 0402 R28 OPT 0402 R27 OPT 0402 R47 0402 R58 0402 R34 10 R25 OPT 0402 E10 C66 1pF NP0 DAP15A8 DAN15A7 DAP14B8 DAN14B7 DAP13C8 DAN13C7 DAP12D8 DAN12D7 DAP11E8 DAN11E7 DAP10F8 DAN10F7 DAP9G8 DAN9G7 DAP8H8 DAN8H7 DAP7K8 DAN7K7 DAP6L8 DAN6L7 DAP5M8 DAN5M7 DAP4N8 DAN4N7 DAP3P8 DAN3P7 DAP2Q8 DAN2Q7 DAP1R8 DAN1R7 DAP0S8 DAN0S7 DBP15A10DBN15A9 DBP14B10DBN14B9 DBP13C10DBN13C9 DBP12D10DBN12D9 DBP11E10DBN11E9 DBP10F10DBN10F9 DBP9G10DBN9G9 DBP8H10DBN8H9 DBP7K10DBN7K9 DBP6L10DBN6L9 DBP5M10DBN5M9 DBP4N10DBN4N9 DBP3P10DBN3P9 DBP2Q10DBN2Q9 DBP1R10DBN1R9 DBP0S10DBN0S9 DCKIPJ10 DCKINJ9 CKPA3 CKNA2 IOUTP H1 IOUTN J1 SCKS5 SD0S3 SDIS4 PDS1 CSS2 REFIO M1FSADJ M2 DCKON J7DCKOP J8 TSTPR4 TSTNR3 SVDDS6 R43 OPT 0402 JP1 R57 0402 R39 OPT C43 0.01uF 0402 X5R R44 0402 R36 OPT R45 499
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
61 EECLK
62 EECS
0 OHMS
Figure 6. DC2085 Demo Circuit Schematic (Sheet 2)
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. Figure 7. DC2085 Demo Circuit Schematic (Sheet 3)
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. Figure 8. DC2085 Demo Circuit Schematic (Sheet 4)
DEMO MANUAL DC2085 LINEAR TECHNOLOGY CORPORATION 2014 LT 0317 REV B • PRINTED IN USA DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LT C) 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 ONL Y and is not provided by LT C 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 LT C 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. LT C assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LT C 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 LT C applica- tion engineer . Mailing Address: Linear T echnology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation