Évaluations - 1, GPA: 3 ( )

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Adobe Systems 0–1300207782- 119FREQUENCY (MHz) AMPLITUDE ( dBFS) –10–20–30–40–50–60–70–80–90–100–110–1205101520fIN = 3.5MHz @ –1dBFSLNA = 6.VGAIN = 1VFILTER TUNEDHPF = 700kHz Figure 17. Typical FFT, AD9272/AD9273 USING THE INTEGRATED CROSSPOINT SWITCH (CW DOPPLER MODE) To examine the spectrum of the CW Doppler integrated crosspoint switch output, use the following procedure: 1. Complete the steps in the Configuring the Board and Using the Software for Testing sections to ensure that the board is set up correctly. 2. Optionally, remove the voltage source from the gain pin. It does not affect the CW Doppler output. 3. Connect the dc voltage source to P601, connecting the .5 V pin, the 0 V ground pin, and the +5 V pin as shown in Figure 1. These benchtop linear supplies should each have 100 mA of current capability. 4. Place jumpers on the top pin pairs of P606 or P607 to connect CWD2+/CWD2. to CWD5+/CWD5. to the IOP/ION buses. This directs each of these connections to the output amplifier for display. Note that the CWD0±/CWD1±/CWD6±/CWD7± outputs are configured and biased to interface with the AD8339 evaluation board. The AD9272/AD9273 is specially designed to snap onto the AD8339 evaluation board to allow the user to evaluate a larger portion of this common signal chain. For detailed instructions about enabling this function, send an email to highspeed.converters@analog.com. 5. Use a 1 m, shielded, RG-58, 50 . coaxial cable to connect the spectrum analyzer to J402 (labeled AOUT on the evaluation board). 6. In the ADCBase 0 tab of the SPI Controller, find the MODES(8) box. Select the CW Mode option (see Figure 18). Adobe Systems 07782- 029 Figure 18. SPI Controller, MODES(8) Box 7. In the ADC x tab of the SPI Controller, where x is the channel to which an analog input is applied, find the CROSSPOINT SWITCH(2D) box. From the Crosspoint Switch Modes drop-down box, select the cwd2p/n option (see Figure 19). Adobe Systems 07782- 030 Figure 19. SPI Controller, CROSSPOINT SWITCH(2D) Box 8. Examine the spectrum analyzer for the CW Doppler output (see Figure 20 for an example). Adobe Systems 0–10–20–30–40–50–60–70–80–90–1000207782- 004FREQUENCY (MHz) AMPLITUDE ( dBm) 5101520FREQUENCY = 2.3MHzCWD1±, DIFFERENTIAL OUTPUT Figure 20. Typical Spectrum Analyzer Display of CWD Output EVALUATION BOARD SCHEMATICS AND ARTWORK Adobe Systems 07782-005 Figure 21. Evaluation Board Schematic, DUT Analog Input Circuits Adobe Systems 07782-006 Figure 22. Evaluation Board Schematic, DUT Analog Input Circuits (Continued) Adobe Systems 07782-007 Figure 23. Evaluation Board Schematic, DUT, VREF, and Decoupling Adobe Systems 07782-008 Figure 24. Evaluation Board Schematic, Clock, SPI, and Gain Circuits Adobe Systems 07782-009 Figure 25. Evaluation Board Schematic, Power Supply, CW Doppler, Digital Output Interface Adobe Systems 07782- 010 Figure 26. Evaluation Board Layout, Top Side Adobe Systems 07782- 011 Figure 27. Evaluation Board Layout, Ground Plane (Layer 2) Adobe Systems 07782- 012 Figure 28. Evaluation Board Layout, Power Plane (Layer 3) Adobe Systems 07782- 013 Figure 29. Evaluation Board Layout, Power Plane (Layer 4) Adobe Systems 07782- 014 Figure 30. Evaluation Board Layout, Ground Plane (Layer 5) Adobe Systems 07782- 015 Figure 31. Evaluation Board Layout, Bottom Side ORDERING INFORMATION BILL OF MATERIALS Table 1. Item Qty Reference Designator Description Manufacturer Part Number 1 79 C101, C102, C106, C110, C111, C115, C120, C121, C125, C130, C131, C136, C201, C202, C206, C210, C211, C215, C220, C221, C225, C230, C231, C236, C301, C302, C304, C305, C306, C307, C308, C309, C401, C402, C403, C404, C409, C410, C412, C413, C414, C415, C416, C419, C420, C421, C422, C423, C425, C502, C504, C601, C602, C706, C708, C710, C712, C730, C731, C732, C733, C734, C735, C740, C742, C743, C744, C745, C749, C750, C751, C752, C753, C754, C755, C756, C770, C771, C2201 Capacitor, 0.1 .F, 0402, ceramic, X5R, 10 V Panasonic ECJ-0EB1A104K 2 9 C426, C714, C715, C716, C717, C719, C720, C721, C722 Capacitor, 1.0 .F, 0603, ceramic, 16 V, X5R Panasonic ECJ-BVB1C105M 3 6 C501, C503, C705, C707, C709, C711 Capacitor, 10 .F, 0603, ceramic, 6.3 V, 20%, X5R Panasonic ECJ-1VB0J106M 4 1 C704 Capacitor, 10 .F, 6032-28, tantalum, SMT, 16 V, 10% Kemet T491C106K016AT 5 2 C801, C802 Capacitor mono ceramic, 1 .F, 0402, X5R Murata GRM155B30J105KE18D 6 1 C803 Capacitor ceramic, 100 pF, 0402 Panasonic ECJ-0EC1H101J 7 1 CR702 LED, 0603, green Panasonic LNJ314G8TRA 8 1 D401 Diode Schottky GP LN 30 V, 20 mA SOT-23 Avago HSMS-2812-TR1G 9 8 D101, D102, D103, D104, D201, D202, D203, D204 Diode Schottky GP LN 20 V SOT-23 Fairchild MMBD4148SE 10 5 D701, D702, D703, D704, D705 Diode, silicon rectifier, SMBJ, 2 A, 50 V Microcommercial S2A-TP 11 1 F701 Polyswitch 1.1 A reset fuse SMD Tyco/Raychem NANOSMDC110F-2 12 1 OSC401 CLK oscillator, 3.3 V, 50 MHz/65 MHz/80 MHz Valpey Fisher VFAC3-BHL-50MHz, VFAC3-BHL-65MHz, VFAC3-BHL-80MHz 13 12 J101, J102, J103, J104, J201, J202, J203, J2...

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