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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
000
010
011
fout
output
fr
IF 100
frRF 110
fp
IF 101
fp
RF 111
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