HMC701LP6CE Datasheet, PDF (41/46 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N Synthesizer

v03.0709
HMC701LP6CE
8 GHz 16-Bit Fractional-N Synthesizer
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Table 29. Reg 12h Delta Sigma Modulator Register
Bit
Type
Name
Default
Description
0
R/W dsm_ref_clk_select
0
use reference instead of divider
1
R/W dsm_invert_clk_sd3
1
invert Δ∑ clk
2
R/W dsm_invert_clk_rph
0
inverts the ref clock phase
3
R/W dsm_integer_mode
1- enables Integer Mode, bypasses the Δ∑
0
modulator, leaves it running
see also dsm_rstb Reg01h<13> to disable the
modulator
4
R/W Reserved
0
5
R/W Reserved
0
6
7
9:8
13:10
17:14
R/W
R/W
R/W
R/W
R/W
dsm_xref_sin_select
dsm_autoseed
dsm_order
dsm_quant_max
dsm_quant_min
0
1
2
4’b0111
4’b1000
when xref is selected specifies that the sine
source is used
automatic seed load when changing the frac
part, uses value in seed
00-first order 01-second 10-third fb 11-third ff
max value allowed out of Δ∑ modulator quantizer
limits are +7 to -8, typ ±3 or ±4
min value allowed out of Δ∑ modulator quantizer
limits are +7 to -8, typ ±3 or ±4
Table 30. Reg 14h CW Sweep Control Register
Bit
Type
Name
Default
0
R/W clear_ovf_undf
0
1
R/W ramp_enable
0
2
R/W ramp_trigg
0
3
R/W ramp_repeat_en
0
4
R/W ramp_startdir_dn
0
5
R/W ramp_trig_ext_en
0
6
R/W ramp_singlestep
0
7
R/W ramp_singledir
0
Description
asynchronous clear for ovf/undf flags
Ramp En/rstb
1= enables the CW Ramp Function
Write always triggers ramps if bit <2> = 0, if bit
<2> = 1, Ramp will not trigger, bit <2> must be
reset to 0 first
Ramp Repeat Seq enable
1= enables autotrigger of ramps
0 = ramp_trigg starts each ramp
Ramp start direction
1= Start with Ramp Down
0= Start with Ramp Up
Enable hardware trigger on GPO3 pin
Ramp single step, advances the ramp to the next
step, and holds frequency
Ramps in one direction only with hop to start at
end of ramp
Table 31. Reg 15h CW Sweep Ramp Step Register
Bit
Type
Name
Default
Description
23:0
R/W ramp_step
2048 Ramp Step size
Table 32. Reg 16h CW Sweep Ramp Step Number Register
Bit
Type
Name
Default
Description
23:0
R/W ramp_steps_number
2048 Ramp Number of steps in ramp
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