Michael Drozd NCSG Applications capacitor value depends voltage c

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Michael Drozd NCSG Applications capacitor value depends voltage c

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AN2181/D Rev. 0.1, 11/2001 MPC860 Revision Considerations
Michael Drozd NCSG Applications
capacitor value depends voltage controlled oscillator (VCO) frequency resulting multiplication factor. larger capacitor value, slower feedback loop. MPC860 User's Manual (MPC860UM/AD Rev. recommends values depending multiplication factor (MF). value below recommended range, jitter output increases. value larger than recommended range, never achieve lock after system startup.
Device Nomenclature Current Table
formula table 15-2 page 15-8 MPC860 Users Manual valid revision silicon eariler. revision silicon derived from last digits part number, e.g. XPC860ENZP66C1 revision silicon. XPC860PZP80D4 revision silicon.
Revision Implementation
change manufacturing technology used revision silicon, revised formula must used calculate appropriate value. values larger revision compared revision formula obtain lower jitter. systems which migrating from revision revision capacitor value need change, within calculation ranges. possible from revision revision MPC860 without changing value. However, system must have timing margins least propogation delay values signals, especially SDRAM signals. Table shows revised formula revision silicon later.
Table Range (MF+1) (MF+1)
Capacitor Value Revision Silicon later Based PLPRCR[MF].
Minimum Capacitance [(MF+1) 580] (MF+1) Maximum Capacitance [(MF+1) 780] (MF+1) 1470 Unit
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Table Revision History
Revision 8/2001 11/2001 Date Change Initial revision Revised template
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AN2181/D
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