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UG-802 Datasheet(PDF) 4 Page - Analog Devices |
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UG-802 Datasheet(HTML) 4 Page - Analog Devices |
4 / 19 page UG-802 EV-ADF5355SD1Z User Guide Rev. B | Page 4 of 19 EVALUATION BOARD HARDWARE The EV-ADF5355SD1Z requires an SDP-S platform that uses the EVAL-SDP-CS1Z (SDP-B is not recommended). The EV-ADF5355SD1Z schematics are shown in Figure 7, Figure 8, and Figure 9. The silkscreens for the evaluation board are shown in Figure 10 and Figure 11. POWER SUPPLIES The board is powered by a 6 V power supply connected to the red and black banana connectors. Connect the red connector to a 6 V power supply and the black connector to ground. The power supply circuitry allows the user two or three separate low dropout (LDO) regulators to feed the ADF5355 (using fewer LDO regulators increases the risk of spur contaminated dc feeds). The charge pump and VCO supply pins are powered from a 5 V ADM7150 high performance, low noise regulator. The remaining supplies are powered from a 3.3 V ADM7150 high performance, low noise regulator. LED1 indicates when the ADF5355 is powered on. Use Switch S1 to switch the 6 V power to the board on and off. RF OUTPUT The EV-ADF5355SD1Z has one pair of SMA output connectors: RFOUTA+ and RFOUTA− (differential outputs). Because they are sensitive to impedance mismatch, connect the RF outputs to equal load impedances. If only one port of a differential pair is used, terminate the complementary port with an equal load terminator (in general, a 50 Ω terminator). SMA RFOUTB is a single-ended RF output that operates from 6.8 GHz to 13.6 GHz. If only RFOUTB is used, power off RFOUTA+ and RFOUTA−. If left on, terminate both RFOUTA+ and RFOUTA− SMA connectors with 50 Ω terminators. LOOP FILTER The loop filter schematic is included in the board schematic in Figure 7. Figure 3 shows the loop filter component placements. For lowest noise at 100 kHz offset, use the following components (that are inserted on the evaluation board) with a 0.9 mA charge pump current: C60 = 22 nF, C59 = 0.47 μF, C61 = 10 nF, C73 = 10 pF R14 = 220 Ω, R1 = 470 Ω For lowest rms phase noise, use the following components with 0.9 mA charge pump current: C60 = 1.2 nF, C59 = 33 nF, C61 = 390 pF, C73 = 10 pF R14 = 1 kΩ, R17 = 3.3 kΩ Figure 3. Loop Filter Placement REFERENCE SOURCE The evaluation board contains a 122.88 MHz differential output TCXO from Vectron International. If preferred, the user may supply either a single-ended or differential reference input to the REFINA/REFINB SMA connectors. When using an external reference, remove R12 to disconnect the power rail from the TCXO. To use a single-ended REFINx, connect a low noise 122.88 MHz reference source to SMA REFINB, and connect a 50 Ω terminator to SMA REFINA. Remove Resistor R27 (100 Ω). To use a differ- ential REFINx, connect the differential signal to SMA REFINA and SMA REFINB. The differential REFINA/REFINB SMA connectors can operate to a 500 MHz input frequency. In the schematic shown in Figure 7, the REFINA pin of U1 (ADF5355) is connected to SMA REFINB, and the REFINB pin of U1 (ADF5355) is connected to SMA REFINA. This schematic matches the evaluation board connections. DEFAULT CONFIGURATION All components necessary for local oscillator generation are inserted on the board. This board is shipped with the ADF5355 synthesizer with an integrated VCO, a differential 122.88 MHz reference TCXO, and a 5 kHz loop filter (ICP = 0.9 mA). RVTUNE C73 RCPOUT R17 R14 |
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