MB1519 Fujitsu Microelectronics, Inc., MB1519 Datasheet - Page 8

• Manufacturer Part Number: MB1519
• Description: Dual Serial Input Pll Frequency Synthesizer
• Manufacturer: Fujitsu Microelectronics, Inc.

8
PHASE DETECTOR OUTPUT WAVEFORM
Note:
MB1519
Phase difference detection range = –2 to +2
LD output becomes low when phase difference is t
LD output becomes high when phase difference less than t
(e. g. t
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.
fr
fp
LD
(FC bit = High)
D
(FC bit = Low)
D
O
O
W
= 625 to 1250 ns, foscin = 12.8 MHz)
Z
Z
t
W
H
W
or more.
t
W
W
is reperated 3 times or more.
L