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AD9557 Datasheet(PDF) 29 Page - Analog Devices |
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AD9557 Datasheet(HTML) 29 Page - Analog Devices |
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29 / 95 page  Data Sheet AD9557 Rev. C | Page 29 of 95 Program the Reference Profiles The reference profile parameters reside in Register 0x0700 to Register 0x0766. The AD9557 evaluation software contains a wizard that calculates these values based on the user input frequency. See the Reference Profiles section for details on programming these functions. They include the following: • Reference period • Reference period tolerance • Reference validation timer • Selection of high phase margin, loop filter coefficients • DPLL loop bandwidth • Reference prescaler (R divider) • Feedback dividers (N1, N2, N3, FRAC1, and MOD1) • Phase and frequency lock detector controls Generate the Reference Acquisition After the registers are programmed, the user can clear the user free run bit (Register 0x0A01, Bit 5) and issue an I/O update, using Register 0x0005, Bit 0 to invoke all of the register settings that are programmed up to this point. After the registers are programmed, the DPLL locks to the first available valid reference that has the highest priority. |
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