HMC703LP4E Datasheet, PDF (50/58 Pages) Hittite Microwave Corporation – 8 GHZ FRACTIONAL SYNTHESIZER

v02.0813
HMC703LP4E
8 GHz fractional synthesizer
Table 25. Reg 0Ch ALTINT
BIT
TYPE
NAME
[15:0]
R/W
ALTINT
Table 26. Reg 0Dh ALTFRAC
BIT
TYPE
NAME
[23:0]
R/W
ALTFRAC
Table 27. Reg 0Eh SPI TRIG
BIT
TYPE
NAME
[0]
R/W
SPITRIG
W DEFLT
DESCRIPTION
16
25d
Stop freq for Ramp mode, Alternate freq for FM mode. See “Opera-
tion Modes” for more information.
W DEFLT
DESCRIPTION
24
0
Stop freq for Ramp mode, Alternate freq for FM mode, number of
channels/boundary for Exact frequency mode. See “Operation
Modes” for more information.
W DEFLT
DESCRIPTION
1
0
This bit can be used as an alternative to the external TRIG pin.
If Reg06h[9] (EXTTRIG_EN)= 0 then this bit is used to trigger
sweep, FM, or PM modes,
Trigger requires initial state of 0 followed by a write of 1. Register
must be reset to 0 before subsequent triggers.
If Reg06[8] = 0, then in PM mode this register is level sensitive and
modulates the phase.
See “Operating Modes” for more information.
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