HMC704LP4E Datasheet, PDF (37/44 Pages) Hittite Microwave Corporation – 8 GHz fractionaL-N PLL

v04.0215
HMC704LP4E
8 GHZ FRACTIONAL-N PLL
Table 15. Reg 02h REFDIV Register
BIT
TYPE
NAME
W
[13:0]
R/W
rdiv
14
DEFLT
1
DESCRIPTION
Reference Divider ’R’ Value (EQ 8)
Divider use also requires refBufEn Reg08[3]=1
min 0d
max 16383d
Table 16. Reg 03h Frequency Register - Integer Part
BIT
TYPE
NAME
W DEFLT
DESCRIPTION
VCO Divider Integer part, used in all modes, see (EQ 10)
[18:0] R/W
Fractional Mode
intg
19
200d
C8h
min 20d
max 219 -4 = 7FFFCh = 524,284d
Integer Mode
min 16d
max 219-1 = 7FFFFh = 524,287d
Table 17. Reg 04h Frequency Register - Fractional Part
BIT
TYPE
[23:0] R/W
NAME
frac
W DEFLT
DESCRIPTION
VCO Divider Fractional part (24 bit unsigned) see Fractional Fre-
quency Tuning
24
0
Fractional Division Value = Reg4[23:0]/2^24
Used in Fractional Mode only
min 0d
max 2^24-1 = FFFFFFh = 16,777,215d
Table 18. Reg 05h Aux SPI Register
BIT
TYPE
NAME
W
[15:0]
R/W
Aux Data
16
DEFLT
0
DESCRIPTION
Data to be output on ASD pin
5 - 37
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