Fujitsu MB15F74UL manual Divide ratio SW = H SW = L, Current value, LD/fout pin state

MB15F74UL

•Prescaler Data Setting

Divide ratio		SW = “H”	SW = “L”
Prescaler divide ratio IF-PLL		32/33	64/65
Prescaler divide ratio RF-PLL		64/65	128/129
• Charge Pump Current Setting
Current value	CS
±6.0 mA	1
±1.5 mA	0

•LD/fout output Selectable Bit Setting

LD/fout pin state		LDS	T1	T2
		0	0	0
LD output		0	1	0
		0	1	1
	frIF	1	0	0
fout	frRF	1	1	0
output	fpIF	1	0	1
	fpRF	1	1	1

•Phase Comparator Phase Switching Data Setting

Phase comparator input	FCIF, RF = “H”	FC IF, RF = “L”
	DoIF, RF	DoIF, RF
fr > fp	H	L
fr < fp	L	H
fr = fp	Z	Z
Z : High-impedance

Depending upon the VCO and LPF polarity, FC bit should be set.

High

(1)

(1)VCO polarity FC = “H”

(2)VCO polarity FC = “L”

VCO Output

Frequency

(2)

LPF Output voltage Max

Note : Give attention to the polarity for using active type LPF.

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