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AD9912ABCPZ Datasheet(PDF) 36 Page - Analog Devices |
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AD9912ABCPZ Datasheet(HTML) 36 Page - Analog Devices |
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36 / 40 page  AD9912 Rev. F | Page 36 of 40 Register 0x01A9—FTW0 (Frequency Tuning Word) (Continued) Table 27. Bits Bit Name Description [31:24] FTW0 These registers contain the FTW (frequency tuning word) for the DDS. The FTW determines the ratio of the AD9912 output frequency to its DAC system clock. Register 0x01A6 is the least significant byte of the FTW. Note that the power-up default is defined by start-up Pin S1 to Pin S4. Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity. Register 0x01AA—FTW0 (Frequency Tuning Word) (Continued) Table 28. Bits Bit Name Description [39:32] FTW0 These registers contain the FTW (frequency tuning word) for the DDS. The FTW determines the ratio of the AD9912 output frequency to its DAC system clock. Register 0x01A6 is the least significant byte of the FTW. Note that the power-up default is defined by start-up Pin S1 to Pin S4. Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity. Register 0x01AB—FTW0 (Frequency Tuning Word) (Continued) Table 29. Bits Bit Name Description [47:40] FTW0 These registers contain the FTW (frequency tuning word) for the DDS. The FTW determines the ratio of the AD9912 output frequency to its DAC system clock. Register 0x01A6 is the least significant byte of the FTW. Note that the power-up default is defined by start-up Pin S1 to Pin S4. Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity. Register 0x01AC—Phase Table 30. Bits Bit Name Description [7:0] DDS phase word Allows the user to vary the phase of the DDS output. See the Direct Digital Synthesizer section. Register 0x01AC is the least significant byte of the phase offset word (POW). Note that a momentary phase discontinuity may occur as the phase passes through 45° intervals. Register 0x01AD—Phase (Continued) Table 31. Bits Bit Name Description [13:8] DDS phase word Allows the user to vary the phase of the DDS output. See the Direct Digital Synthesizer section. Register 0x01AC is the least significant byte of the phase offset word (POW). Note that a momentary phase discontinuity may occur as the phase passes through 45° intervals. |
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