參數(shù)資料
型號： AD9549A/PCBZ
廠商： Analog Devices Inc
文件頁數(shù)： 58/76頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD9549A
設(shè)計資源： AD9549 Schematics
AD9549 Gerber Files
標準包裝： 1
主要目的： 計時，時鐘發(fā)生器
嵌入式： 否
已用 IC / 零件： AD9549A
主要屬性： 8 kHz ~ 750 MHz 輸入
次要屬性： 差分輸出
已供物品： 板
AD9549
Rev. D | Page 61 of 76
FREE-RUN (SINGLE-TONE) MODE (REGISTER 0x01A0 TO REGISTER 0x01AD)
Register 0x01A0 to Register 0x01A5—Reserved
Register 0x01A6—FTW0 (Frequency Tuning Word)
Table 60.
Bit
Bit Name
Description
[7:0]
FTW0
FTW (frequency tuning word) for DDS when the loop is not closed (see Register 0x0100, Bit 0). Also used as
the initial frequency estimate when the estimator is disabled (see Register 0x0100, Bit 4) Note that the
power-up default is defined by the startup of Pin S1 to Pin S4 (see the Default DDS Output Frequency on
Power-Up section). Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity.
Register 0x01A7—FTW0 (Frequency Tuning Word) (Continued)
Table 61.
Bit
Bit Name
Description
[15:8]
FTW0
FTW (frequency tuning word) for DDS when the loop is not closed (see Register 0x0100, Bit 0). Also used as
the initial frequency estimate when the estimator is disabled (see Register 0x0100, Bit 4) Note that the
power-up default is defined by the startup of Pin S1 to Pin S4 (see the Default DDS Output Frequency on
Power-Up section). Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity.
Register 0x01A8—FTW0 (Frequency Tuning Word) (Continued)
Table 62.
Bit
Bit Name
Description
[23:16]
FTW0
FTW (frequency tuning word) for DDS when the loop is not closed (see Register 0x0100, Bit 0). Also used as
the initial frequency estimate when the estimator is disabled (see Register 0x0100, Bit 4) Note that the
power-up default is defined by the startup of Pin S1 to Pin S4 (see the Default DDS Output Frequency on
Power-Up section). Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity.
Register 0x01A9—FTW0 (Frequency Tuning Word) (Continued)
Table 63.
Bit
Bit Name
Description
[31:24]
FTW0
FTW (frequency tuning word) for DDS when the loop is not closed (see Register 0x0100, Bit 0). Also used as
the initial frequency estimate when the estimator is disabled (see Register 0x0100, Bit 4) Note that the
power-up default is defined by the startup of Pin S1 to Pin S4 (see the Default DDS Output Frequency on
Power-Up section). Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity.
Register 0x01AA—FTW0 (Frequency Tuning Word) (Continued)
Table 64.
Bit
Bit Name
Description
[39:32]
FTW0
FTW (frequency tuning word) for DDS when the loop is not closed (see Register 0x0100, Bit 0). Also used as
the initial frequency estimate when the estimator is disabled (see Register 0x0100, Bit 4) Note that the
power-up default is defined by the startup of Pin S1 to Pin S4 (see the Default DDS Output Frequency on
Power-Up section). Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity.
Register 0x01AB—FTW0 (Frequency Tuning Word) (Continued)
Table 65.
Bit
Bit Name
Description
[47:40]
FTW0
FTW (frequency tuning word) for DDS when the loop is not closed (see Register 0x0100, Bit 0). Also used as
the initial frequency estimate when the estimator is disabled (see Register 0x0100, Bit 4) Note that the
power-up default is defined by the startup of Pin S1 to Pin S4 (see the Default DDS Output Frequency on
Power-Up section). Updates to the FTW results in an instantaneous frequency jump but no phase discontinuity.
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