MB87P2020 Datasheet, PDF (34/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
2.1 Definitions
2.1.1 Phase Skew
Maximum phase differences between reference clock and feed back clock measured by the CK pin of the
PLL and the feedback clock measured by the FB pin.
CK
FB
2.1.2 Duty
Duty is the maximum and minimum values indicated by the ratio of a high pulse width to a low pulse with
(T_low to T_high) in one cycle of the output clock measured by the X pin of the PLL.
X
T _high
T _low
2.1.3 Lock Up Time
Lock up time is the time period that starts when the S pin of the PLL changes from 0 to 1 and ends when
the PLL is locked.
S
L
lock up time
2.1.4 Jitter
Jitter is the maximum and minimum values for cycle variations (T₂-T₁, T₃-T₂ and T₄-T₃) in two continuous
cycles measured by the X pin of the PLL.
T1
T2
T3
T4
X
2.1.5 Variation in Output Cycle
The max./min. time periods from the rising edge of the output clock to thenext rising edge measured by the
X pin of the PLL. Observation points: 1400. The max./min values in T₁, T₂, T₃ and T₄ in above figure.
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