FUJITSU MB15E07SL - Manual (Page 14)

MB15E07SL
14
■ PHASE COMPARATOR OUTPUT WAVEFORM
fr
fp
LD
D O
D O
t
WU
t
WL
Notes :
•
Phase error detection range: –2
π
to +2
π
•
Pulses on Do signal during locked state are output to prevent dead zone.
•
LD output becomes low when phase is t
WU
or more. LD output becomes high when phase error
is t
WL
or less and continues to be so for three cycles or more.
•
t
WU
and t
WL
depend on OSC
IN
input frequency.
t
WU
> 2/fosc (s) (e. g. t
WU
> 156.3 ns, fosc = 12.8 MHz)
t
WU
< 4/fosc (s) (e. g. t
WL
< 312.5 ns, fosc = 12.8 MHz)
•
LD becomes high during the power saving mode (PS = “L”).
[FC = “H”]
[FC = “L”]