DEMO MANUAL DC1685A LTC6417 and LTC2209 Combo Board DESCRIPTION Demonstration circuit 1685A features the LTC(R)6417, a 1.6GHz differential ADC buffer driving the LTC2209, a 16-bit 160Msps ADC. The DC1685B is supplied with a bandpass filter centered at 140MHz between the buffer and ADC. The filter center frequency can be changed to optimize performance at different analog input frequencies. Both single-ended and differential configurations are supported at the inputs. The DC1685A has been developed from the DC1281A, used to characterize LTC2209 family of ADCs. Use the DC1685A with a DC890 FastDAACS and PScopeTM Software to collect time and frequency data. Design files for this circuit board are available. All registered trademarks and trademarks are the property of their respective owners. QUICK START PROCEDURE DC1685A is easy to set up. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. Apply power to the DC1685A 3.3V across the pins marked VCC and PWR_GND and 5V across AMP_POWER and PWR_GND. The DC1685A requires up to 800mA from the VCC, and 200mA from the AMP_POWER. 2. Supply power to the DC890B fast DAACS board with an external 6V 0.5V, 1A on turrets G7(+) and G1(-) or the adjacent 2.1mm power jack. Unless the DC890B detects external power, it will not activate the LVDS mode of the Xilinx Spartan-III FPGA. The FPGA actively terminates the LVDS repeaters at the outputs of the LTC2209. 3. Connect encode clock to the DC1685A on the SMA connector marked (J3) Encode Clock. This transformer coupled input is terminated with a 100 at the ADC clock inputs. For best noise performance the clock input must be driven with a very low jitter source. When using a sinusoidal generator, the amplitude should be as large as possible, up to 13dBm. Using bandpass filters on the clock and analog inputs will improve the noise performance by reducing the wideband noise power of the signals. Data sheet FFT plots are taken with 10 pole LC filters made by TTE (Los Angeles, CA) to suppress signal generator harmonics, non-harmonically related spurs and broadband noise. Low phase noise (jitter) Agilent 8644B generators are used with the TTE bandpass filters for the clock and analog input. 4. Connect the analog input to the DC1685A to the SMA connector marked (J6) IN+ at 140MHz. This input is capacitively coupled to a 1:4 balun transformer WBC4-11. 5. Start and configure PScope data collection software for the FastDAACS (DC890) by selecting AutoConfigure. If the board is not detected, update PScope for latest software and device list, and then select LTC2209 from the Configure Device menu. You can also manually configure PScope for the LTC2209 by setting the parameters listed in Table 1. 6. Collect data by clicking on the Collect button. Time and frequency plots will be displayed in the PScope window. Consult the DC890B Quick Start Guide for more details. This procedure contains only one critical sequence. The user must apply supply voltage before applying signal power to the analog and clock inputs or forcing a voltage to any other turrets. The user must also remove the signal to the analog and clock inputs and voltages on any other turret before turning down the supply voltage. Rev 0 1 DEMO MANUAL DC1685A QUICK START PROCEDURE Table 2 summarizes the function of each SMA connector and jumper on the board and their suggested default settings. Table 1. PScope User Configuration for LTC2209. USER CONFIGURE Bits 16 Channels 1 Alignment 16 FPGA Ld LVDS Bipolar [x] Positive Edge Clk [x] Table 2. DC1685A Connector and Jumpers CONNECTOR/ JUMPER FUNCTION Buffer ADC Interface The LTC6417 has been specifically designed to interface directly with high speed A/D converters. In Figure 2, the differential LTC6417 outputs are bandpass filtered to drive the differential inputs of the LTC2209. Such a filter suppresses harmonics and limits the wideband noise of the amplifier to achieve the best SFDR and SNR. Table 3 lists component values suggested for bandpass filters optimized for various input frequencies. The 1:4 transformer at the input of the LTC6417 performs a single-ended to differential conversion and provides 6dB voltage gain. For more detail on the LTC6417 and LTC2209, consult the data sheets. Table 3. Bandpass Filter Component Values for Various Input Frequencies J2 (MODE) ADC Output Format and Clock Duty Stabilizer CDS. Default to VCC for twos complement and CDS off. J3 (SHDN) ADC Power Shutdown. Default to RUN. COMPONENTS 70MHz 140MHz 270MHz 380MHz J3 (DITH) ADC Internal Dither Enable. Default to OFF to disable internal dither. R12 = R36 [] 60.4 60.4 60.4 60.4 J4 (PGA) ADC Programmable Gain Amplifier. Default to 1x gain mode. C43 = C44 [pF] 56 27 15 12 E1 = E2 [nH] 100 51 27 18 J5 (IN-) Differential Input. Not connected by default. Install capacitor C9 to drive the input differentially. J6 (IN+) J7 (ENCODE CLOCK) J11 (OR) INPUT FREQUENCIES C41 [pF] 47 12 12 10 C10 = C40 [pF] 13 12 33 2.7 Differential Input. Connected to input balun for single-ended operation. Drive from a 50 signal source. No external termination needed. E5 [nH] 100 51 27 18 R42 = R43 [] 300 300 300 300 Single-Ended Input. Drive with a 13dBm low jitter 50 source. R53 [] 120 120 120 120 C45 = C46 [pF] 39 18 10 8.2 E3 = E4 [nH] 150 75 39 27 Overrange Output. Connect to an oscilloscope input. Rev 0 2 DEMO MANUAL DC1685A PCB LAYOUT Figure 1. DC1685A Layout Rev 0 3 DEMO MANUAL DC1685A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 3 B1, B4, B5 Ferrite Bead, SMT 1206 MURATA, BLM31PG330SN1L 2 3 C1, C2, C3 Cap., X7R 0.01F 100V 10% 0603 AVX, 06031C103KAT2A 3 1 C4 Cap., NPO 8.2pF 50V 0.25pF 0402 AVX, 04025A8R2CAT2A 4 26 C5, C7, C8, C11, C12, C15, C16, C20-C23, C25-C37, C39, C42 Cap., X5R 0.1F 10V 10% 0402 AVX, 0402ZD104KAT2A 5 3 C6, C9, C48 Cap., X7R 0.1F 25V 10% 0603 AVX, 06033C104KAT2A 6 3 C10, C40, C41 Cap., X7R 12pF 25V 10% 0402 AVX, 04023C120KAT2A 7 2 C13, C17 Cap., X5R 2.2F 10V 20% 0603 AVX, 0603ZD225MAT2A 8 3 C14, C24, C38 Cap., X5R 4.7F 10V 20% 0805 AVX, 0805ZD475MAT2A 9 0 C18, C19 (OPT) Cap., 0402, OPT 11 2 C43, C44 Cap., NPO 27pF 25V 10% 0402 AVX, 04023A270KAT2A 12 2 C45, C46 Cap., NPO 18pF 25V 10% 0402 AVX, 04023A180KAT2A 13 0 C47, C49 (OPT) Cap., 0603 OPT 14 3 E1, E2, E5 Ceramic Chip Inductor, 51nH, 0603 Coilcraft, 0603HP_51NXGLU 15 2 E3, E4 Ceramic Chip Inductor, 75nH, 0603 Coilcraft, 0603HP_75NXGLU 4 J2, J3, J4, J9 Headers, Dbl. Row 2 x 3 2mm Ctrs. Samtec, TMM-103-02-L-D 10 16 17 18 5 XJ2, XJ3_3-5, XJ3_4-6, XJ4_3-5, XJ4_4-6 Shunt, 2mm Ctrs. Samtec, 2SN-BK-G 19 4 J5, J6, J7, J11 Conn., SMA 50 EMERSON, 142-0701-851 20 0 J10 EDGE-CON-100 21 4 R1, R2, R9, R10 Res., Chip 49.9 0.06W 1% 0402 22 0 R3 (OPT) Res., 0603 OPT 23 2 R4, R5 Res., Chip 5.11 0.06W 1% 0402 VISHAY, CRCW04025R11FKED 24 3 R6, R7, R8 Res., Chip 1.00k 0.06W 1% 0603 YAGEO, RC0603FR-071KL 25 5 R11, R44, R45, R55, R56 Res., Chip 0 0402 VISHAY, CRCW04020000Z0ED 26 1 R12 Res., Chip 82 0.06W 1% 0402 Vishay, CRCW040282R0FKED 27 19 R13, R16-R23, R30-R35, R38-R41 Res., Chip 100 0.05W 5% 0201 YAGEO, RC0201JR-07100RL 28 1 R14 Res., Chip 1.00k 0.06W 1% 0402 YAGEO, RC0402FR-071KL 29 1 R15 Res., Chip 100 0.06W 5% 0402 VISHAY, CRCW0402100RFKED 30 1 R24 Res., Chip 100k 0.06W 5% 0402 VISHAY, CRCW0402100KJNED 31 3 R25, R26, R29 Res., Chip 4.99k 0.06W 1% 0402 VISHAY, CRCW04024K99FKED 32 2 R27, R28 Res., Chip 10 0.05W 5% 0201 VISHAY, CRCW020110R0JNED 33 1 R36 Res., Chip 60.4 0.06W 1% 0402 VISHAY, CRCW040260R4FKED 34 1 R37 Res., Chip 100 0.06W 1% 0603 Vishay, CRCW0603100RFKEA 35 2 R42,R43 Res., Chip 300 0.06W 5% 0402 NIC, NRC04F3000TRF 36 0 R49 (OPT) Res., 0402 OPT 37 1 R53 Res., Chip 120 0.06W 5% 0402 YAGEO, RC0402JR-07120RL 38 6 TP1, TP2, TP4, TP5, TP6, TP7 Turret, Testpoint Mill Max, 2308-2-00-80-00-00-07-0 39 1 T2 XFMR 1 : 4 COILCRAFT, WBC4-14LB 40 1 T3 XFMR MACOM/SM-22 M/A-COM, MABA-007159-000000 YAGEO, RC0402FR-0749R9L Rev 0 4 DEMO MANUAL DC1685A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 41 1 U1 I.C., Serial EEPROM TSSOP-8 MICROCHIP, 24LC025-I/ST 42 1 U2 I.C., 16-Bit, 160Msps ADC QFN(64) (UP) 9mm x 9mm ANALOG DEVICES, LTC2209CUP#PBF 43 2 U3, U4 I.C., LVDS 8-Port, Hi speed Repeater TSSOP48 6.1mm Wide FAIRCHILD, FIN1108MTD 44 1 U5 I.C. BUFFER-LVDS-SINGLE US8 FAIRCHILD, FIN1101K8X 45 1 U6 I.C., ADC Buffer QFN(20) (UDC) 3mm x 4mm ANALOG DEVICES, LTC6417CUDC#PBF 46 4 MTGS at 4 Corners STANDOFF, NYLON .5 1/2" KEYSTONE, 8833(SNAP-ON) Rev 0 5 A B C D 5 4 3 2 1 TECHNOLOGY 1 2 Figure 2a. DC1685A Demo Circuit Schematic 3 4 6 5 A B C D DEMO MANUAL DC1685A SCHEMATIC DIAGRAM Rev 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. A B C D E 5 4 4 5 2 1 1 TECHNOLOGY Figure 2b. DC1685A Demo Circuit Schematic 3 2 3 A B C D E DEMO MANUAL DC1685A SCHEMATIC DIAGRAM Rev 0 7 DEMO MANUAL DC1685A ESD Caution ESD (electrostatic discharge) sensitive device. 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