參數(shù)資料
型號: AD9558/PCBZ
廠商: Analog Devices Inc
文件頁數(shù): 33/104頁
文件大小: 0K
描述: BOARD EVAL FOR AD9558
產(chǎn)品變化通告: AD9558 Minor Metal Mask Change 17/Apr/2012
設(shè)計資源: AD9558 Eval Brd BOM
AD9558 Schematic
標準包裝: 1
系列: *
AD9558
Data Sheet
Rev. B | Page 34 of 104
LOOP CONTROL STATE MACHINE
Switchover
Switchover occurs when the loop controller switches directly
from one input reference to another. The AD9558 handles a
reference switchover by briefly entering holdover mode, loading
the new DPLL parameters, and then immediately recovering.
During the switchover event, however, the AD9558 preserves
the status of the lock detectors to avoid phantom unlock
indications.
Holdover
The holdover state of the DPLL is typically used when none of
the input references are present, although the user can also
manually engage holdover mode. In holdover mode, the output
frequency remains constant. The accuracy of the AD9558 in
holdover mode is dependent on the device programming and
availability of tuning word history.
Recovery from Holdover
When in holdover mode and a valid reference becomes
available, the device exits holdover operation. The loop state
machine restores the DPLL to closed-loop operation, locks to
the selected reference, and sequences the recovery of all the
loop parameters based on the profile settings for the active
reference.
Note that, if the user holdover bit is set, the device does not
automatically exit holdover when a valid reference is available.
However, automatic recovery can occur after clearing the user
holdover bit (Bit 6 in Register 0x0A01).
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AD9559 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual PLL, Quad Input, Multiservice Line Card Adaptive Clock Translator
AD9559/PCBZ 功能描述:時鐘和定時器開發(fā)工具 Multi-protocol line card dual clock RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V
AD9559BCPZ 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Multi-protocol line card dual clock RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
AD9559BCPZ-REEL7 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Multi-protocol line card dual clock RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
AD9559PCBZ 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual PLL, Quad Input, Multiservice Line Card Adaptive Clock Translator