MB1519 Datasheet, PDF (8/16 Pages) Fujitsu Component Limited. – DUAL SERIAL INPUT PLL FREQUENCY SYNTHESIZER

MB1519
PHASE DETECTOR OUTPUT WAVEFORM
fr
fp
t_W
LD
(FC bit = High)
H
D_O
Z
(FC bit = Low)
D_O
Z
t_W
L
Note: • Phase difference detection range = –2π to +2π
• LD output becomes low when phase difference is t_W or more.
LD output becomes high when phase difference less than t_W is reperated 3 times or more.
(e. g. t_W = 625 to 1250 ns, foscin = 12.8 MHz)
• Spike apperance depends on the charge pump characteristics. The spike is output to diminish the dead band.
• When fr > fp or fr < fp, spike might not generate depending up the VCO characteristics.
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