参数资料
型号: LMX1602MDA
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: PLL合成/DDS/VCOs
英文描述: PLL FREQUENCY SYNTHESIZER, 1100 MHz, UUC
封装: DIE
文件页数: 4/19页
文件大小: 238K
代理商: LMX1602MDA
2.0
Programming Description (Continued)
2.5.1
Lock Detect Digital Filter
The Lock Detect Digital Filter compares the difference between the phase of the inputs of the phase detector to a RC generated
delay of approximately 15 ns. To enter the locked state (Lock = HIGH) the phase error must be less than the 15 ns RC delay for
4 consecutive reference cycles. Once in lock (Lock = HIGH), the RC delay is changed to approximately 30 ns. To exit the locked
state (Lock = LOW), the phase error must become greater than the 30 ns RC delay. When the PLL is in the powerdown mode,
Lock is forced LOW. A flow chart of the digital filter is shown below.
2.5.2
Typical Lock Detect Timing (AUX_PD_POL/MAIN_PD_POL = 1)
DS100129-16
DS100129-17
LMX1600/LMX1601/LMX1602
www.national.com
12
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相关代理商/技术参数
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