Fujitsu MB15F74UL Datasheet page 10

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