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ADF4153 Datasheet(PDF) 5 Page - Analog Devices |
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ADF4153 Datasheet(HTML) 5 Page - Analog Devices |
5 / 6 page Circuit Note CN-0232 Rev. 0 | Page 5 of 6 Initialization Procedure The ADF4350 must go through the band select process for every new frequency. 1. Initialize the ADF4350 as normal (program R5, R4, R3, R2, R1, R0), except set DB4, R2 to 1 (ICP three-state enabled), because the ADF4350 charge pump is unused. Set DB9, R4 to 0 for divided VCO output on RFOUTB+. Enable RFOUTB+ (auxiliary out). This signal is fed to the ADF4153 over the coax cable. 2. Initialize the ADF4153 (as per the data sheet) to accept the VCO output frequency as the RF input frequency. Note that the band select switch is internal; therefore, an external switch to remove the PLL VTUNE is not required. 3. When the ADF4153 achieves lock, the ADF4350 counter reset to 1 (DB3, R2) must be activated. Not activating the counter reset degrades spur performance. Additionally, all ADF4350 synthesizer blocks can be powered down using the test mode bit (DB10, R5). Frequency Update 1. Program DB10, R5 to 0 to reactivate the ADF4350 synthesizer blocks. 2. Program DB3, R2 of the ADF4350 to 0 to deactivate the counter reset because these counters are required for band select. 3. Program the ADF4350 and ADF4153 N-counter registers as appropriate for the new frequency. 4. When the ADF4153 achieves lock, the ADF4350 counter reset (DB3, R2) can be activated. Additionally all synthesizer blocks can be powered down using the test mode bit (DB10, R5). 5. Repeat Step 1 to Step 4 as required for new frequencies. The software screen captures shown in Figure 5 and Figure 6 show the software windows for 26 MHz REFIN (ADF4350) and 13 MHz PFD (ADF4153). After setting up the equipment, use standard RF test methods to measure the spectral purity of the output signal. Figure 5. ADF4350 Software Window Figure 6. ADF4153 Software Window |
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