FUJITSU MB15F74UL - Manual (Page 10)

MB15F74UL
10
• Prescaler Data Setting
• Charge Pump Current Setting
• LD / fout output Selectable Bit Setting
• Phase Comparator Phase Switching Data Setting
Z : High-impedance
Depending upon the VCO and LPF polarity, FC bit should be set.
Divide ratio SW
====
“H” SW
====
“L”
Prescaler divide ratio IF-PLL 32/33 64/65
Prescaler divide ratio RF-PLL 64/65 128/129
Current value CS
±
6.0 mA 1
±
1.5 mA 0
LD/fout pin state LDS T1 T2
LD output
0 0 0
0 1 0
0 1 1
fout
output
fr
IF
1 0 0
fr
RF
1 1 0
fp
IF
1 0 1
fp
RF
1 1 1
Phase comparator input
FC
IF
,
RF
====
“H” FC
IF
,
RF
====
“L”
Do
IF
,
RF
Do
IF
,
RF
fr
>
fp H L
fr
<
fp L H
fr
=
fp Z Z
(1)
(2)
(1) VCO polarity FC
=
“H”
(2) VCO polarity FC
=
“L”
Note : Give attention to the polarity for using active type LPF.
VCO Output
Frequency
High
LPF Output voltage Max