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ADF4350 Datasheet(PDF) 4 Page - Analog Devices |
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ADF4350 Datasheet(HTML) 4 Page - Analog Devices |
4 / 6 page CN-0232 Circuit Note Rev. 0 | Page 4 of 6 CIRCUIT EVALUATION AND TEST The CN-0232 uses the EVAL-ADF4350EB2Z board for evaluation of the described circuit, and with some minor modifications, allows for quick setup and evaluation. The EVAL-ADF4350EB2Z board uses the standard ADF4350 programming software, contained on the CD that accompanies the evaluation board. The EVAL-ADF4153EBZ1 evaluation board comes with the software for the ADF4153 PLL. Equipment Needed • EVAL-ADF4350EB2Z with programming software. • EVAL-ADF4153EBZ1 with programming software. • 5.5 V power supply. • R&S SMA100A signal generator or equivalent. • R&S FSUP26 spectrum analyzer or equivalent. • Two PCs with Windows® XP, Windows, Vista (32-bit), or Windows 7 (32-bit), one with an USB port and the other with a printer port. Alternatively, the EVAL-ADF4xxxX- USB USB adaptor kit can be used instead of the printer port, if none is available. The SMA coaxial cable is required to connect RFOUTB+ of the EVAL-ADF4350EB2Z to RFIN of the EVAL-ADF4153EBZ1. A simple SMA splitter is also needed to share the reference source between the two boards. Some flexible microcoaxial cable is required to connect the output of the ADF4153 loop filter to the ADF4350 VTUNE input. To minimize unwanted interference, both sides of the cable must be grounded to suitable GND points on each board. Functional Block Diagram For this experiment, the EVAL-ADF4153EBZ1 and the EVAL- ADF4350EB2Z are used. The EVAL-ADF4350EB2Z is selected because it contains the auxiliary RFOUTB+ output stage, which is connected via SMA cable to the EVAL-ADF4153EBZ1, as shown in Figure 4. Both PLLs use the same reference input (REFIN) frequency; therefore, an SMA splitter connects the same REFIN to both boards. The loop filter output on the EVAL-ADF4153EBZ1 is connected to the VTUNE pin of the ADF4350 via a shielded coaxial cable to ensure that no extra noise or spurs appear on the pin. Both parts are programmed separately. It may be necessary to use different PCs for each board to ensure no conflicts occur between hardware drivers. Getting Started The UG-110 user guide details the installation and use of the EVAL-ADF4350EB2Z evaluation software. UG-110 also contains board setup instructions and the board schematic, layout, and bill of materials. The UG-167 user guide contains similar information relevant to the EVAL-ADF4153EBZ1. Necessary modifications to the board are the removal of the VCO (Y1). To reconfigure this board as an input, remove the R7 resistor and change R8 and R9 to 0 Ω. The PLL loop filter on the ADF4350 board is unused and should be removed. At this point, the microcoaxial cable can be used to connect the output of the ADF4153 loop filter (T7) to the VTUNE pin of the ADF4350 (T4). It is of critical importance that the outer shielding of this cable is connected to a ground point on both boards. REFERENCE FREQUENCY GENERATOR (R&S SMA100A) SPECTRUM ANALYZER (R&S FSUP26) 9V BATTERY POWER SUPPLY 50Ω TERM 50Ω TERM RFOUTA+ RFOUTA− RFOUTB+ RFIN+ CP OUT VTUNE PC PC USB PRINTER COM 5.5V J14 J15 J4 ADF4350 EVALUATION BOARD (EVAL-ADF4350EB2Z) J2 J3 RFOUTB− J5 J1 T4 T7 ADF4153 EVALUATION BOARD (EVAL-ADF4153EBZ1) J5 J2 EVAL- ADF4xxxX-USB USB Figure 4. Test Setup Functional Diagram |
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Similar Description - ADF4350 |
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