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
frIF 100
frRF 110
fpIF 101
fpRF 111
Phase comparator input FCIF, RF =
==
= “H” FCIF, RF =
==
= “L”
DoIF, RF DoIF, 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