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ADF5902 bảng dữ liệu(PDF) 12 Page - Analog Devices |
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ADF5902 bảng dữ liệu(HTML) 12 Page - Analog Devices |
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12 / 39 page ![]() ADF5902 Data Sheet Rev. 0 | Page 12 of 39 PROGRAM MODES Table 6 and Figure 24 through Figure 42 show how to set up the program modes in the ADF5902. Several settings in the ADF5902 are double buffered. These include the LSB fractional value, R counter value (R divider), reference doubler, clock divider, RDIV2, and MUXOUT. This means that two events must occur before the device uses a new value for any of the double buffered settings. First, the new value is latched into the device by writing to the appropriate register. Second, a new write must be performed on Register R5. For example, updating the fractional value can involve a write to the 13 LSB bits in Register R6 and the 12 MSB bits in Register R5. Write to Register R6 first, followed by the write to Register R5. The frequency change begins after the write to Register R5. Double buffering ensures that the bits written to in Register R6 do not take effect until after the write to Register R5. Table 6. C5, C4, C3, C2, and C1 Truth Table Control Bits C5 (DB4) C4 (DB3) C3 (DB2) C2 (DB1) C1 (DB0) Register 0 0 0 0 0 R0 0 0 0 0 1 R1 0 0 0 1 0 R2 0 0 0 1 1 R3 0 0 1 0 0 R4 0 0 1 0 1 R5 0 0 1 1 0 R6 0 0 1 1 1 R7 0 1 0 0 0 R8 0 1 0 0 1 R9 0 1 0 1 0 R10 0 1 0 1 1 R11 0 1 1 0 0 R12 0 1 1 0 1 R13 0 1 1 1 0 R14 0 1 1 1 1 R15 1 0 0 0 0 R16 1 0 0 0 1 R17 |
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