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SM5168CX Arkusz danych(PDF) 6 Page - Nippon Precision Circuits Inc

Numer części SM5168CX
Szczegółowy opis  PLL Synthesizer IC
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Producent  NPC [Nippon Precision Circuits Inc]
Strona internetowa  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5168CX Arkusz danych(HTML) 6 Page - Nippon Precision Circuits Inc

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SM5168 series
SEIKO NPC CORPORATION —6
FUNCTIONAL DESCRIPTION
SM5168A
× series
Frequency dividers
The comparator frequency divider (N-counter) and reference frequency divider (R-counter), one of each, are
set in master-slice to the following values.
I
Comparator frequency divider (N-counter) = 272 to 65535
I
Reference frequency divider (R-counter) = 5 to 65535
Standby mode
When OPR goes from HIGH to LOW, the PLL is in standby mode with the following input/output conditions.
When OPR goes from LOW to HIGH, standby mode is released and the PLL is in operating mode, and the fol-
lowing start-up sequence is executed.
Block
State
Input FIN
LOW level
Comparator frequency divider (N-counter)
Stopped
Input XIN
LOW level
Reference frequency divider (R-counter)
Stopped
Phase comparator
Reset
Output DO
Floating
Output LD
LOW-level
Internal feedback resistance is connected to XIN to activate the reference frequency divider (R-counter).
Internal feedback resistance is connected to FIN.
The comparator frequency divider (N-counter) and the phase comparator are reset.
DO is floating and LD is LOW.
Reference frequency divider (R-counter) starts to perform frequency division.
An internal signal (FR signal) is output on the 2nd clock cycle.
Phase comparator starts and comparator frequency divider (N-counter) starts to perform frequency division.
DO floating condition is released and LD goes HIGH.


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