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LMX2364SLEX Datasheet(PDF) 34 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMX2364SLEX
Description  2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer
PDF  39 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2364SLEX Datasheet(HTML) 34 Page - National Semiconductor (TI)

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Supplemental Information
3.0 USE OF THE DIGITAL LOCK DETECT FUNCTION
The Lock Detect Digital Filter compares the difference be-
tween the phase of the inputs of the phase detector to a RC
generated delay of approximately 15nS. To enter the locked
state (Lock = HIGH) the phase error must be less than the
15nS RC delay for 5 consecutive reference cycles. Once in
lock (Lock = HIGH), the RC delay is changed to approxi-
mately 30nS. To exit the locked state (Lock = LOW), the
phase error must become greater than the 30nS RC delay.
When the PLL is in the power down mode, Lock is forced
LOW. A flow chart of the digital filter is shown below.
20050604
www.national.com
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