HMC703LP4E Datasheet, PDF (46/58 Pages) Hittite Microwave Corporation – 8 GHZ FRACTIONAL SYNTHESIZER

v02.0813
HMC703LP4E
8 GHz fractional synthesizer
Table 16. Reg 03h Frequency Register - Integer Part
BIT
[15:0]
TYPE
R/W
NAME
intg
W DEFLT
DESCRIPTION
16
25d
The (base) integer portion of the prescaler divide ratio. In any of
the fractional modes of operation, this value is double buffered, and
does not take effect until a ‘Trigger’ event. See ‘Operation Modes’
for more information. In integer mode, this value can range from
16 to 65535. In fractional mode it should be restricted between 20
and 65531.
Table 17. Reg 04h Frequency Register - Fractional Part
BIT
[23:0]
TYPE
R/W
NAME
frac
W DEFLT
DESCRIPTION
24
0
VCO Divider Fractional part (24 bit unsigned) see Fractional
Frequency Tuning
N_FRAC = Reg 04h/224
Used in Fractional Modes only
min 0d
max 2^24-1 = FFFFFFh = 16,777,215d
Table 18. Reg 05h Seed
BIT
[23:0]
TYPE
R/W
NAME
SEED
W DEFLT
DESCRIPTION
24 654321h The initial starting point for the fractional modulator at the “Trigger”
position. This value effects the phase of the output, and can effect
some types of spurious content. During sweeps, the modulator can
optionally be reloaded with this value at the start of each ramp.
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