User Manual

PROGRAMMING
3-2
Part No. 001-3422-003
Table 3-1 Programming Function Table
Symbol Bits Function
NM1 12 Number of main divider cycles when prescaler modulus = 64*
NM2 8 if PR = “01”
4 if PR = “10” Number of main divider cycles when prescaler modulus = 65*
NM3 4 if PR = “10” Number of main divider cycles when prescaler modulus = 72*
PR 2 Prescaler type in use
PR = “01”: modulus 2 prescaler (64/65)
PR = “10”: modulus 3 prescaler (64/65/72)
NF 3 Fractional-N increment
FMOD 1 Fractional-N modulus selection flag
“1”: modulo 8
“0”: modulo 5
LONG 1 A word format selection flag
“0”: 24 bit A0 format
“1”: 32 bit A1 format
CN 8 Binary current setting factor for main charge pumps
CL 2 Binary acceleration factor for proportional charge pump current
CK 4 Binary acceleration factor for integral charge pump current
EM 1 Main divider enable flag
EA 1 Auxiliary divider enable flag
SM 2 Reference select for main phase detector
SA 2 Reference select for auxiliary phase detector
NR 12 Reference divider ratio
NA 12 Auxiliary divider ratio
PA 1 Auxiliary prescaler mode:
PA = “0”: divide by 4
PA = “1”: divide by 1
* Not including reset cycles and Fractional-N effects.