HMC701LP6CE Datasheet, PDF (33/40 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N Synthesizer

v09.1112
HMC701LP6CE
8 GHz 16-BIT FRACTIONAL-N PLL
Table 29. Reg 12h Delta Sigma Modulator Register
Bit
Type
Name
0
R/W dsm_ref_clk_select
1
R/W dsm_invert_clk_sd3
2
R/W dsm_invert_clk_rph
3
R/W dsm_integer_mode
Default
0
1
0
0
Description
use reference instead of divider Program 0
invert Δ∑ clk
inverts the ref clock phase
1- enables Integer Mode, bypasses the Δ∑
modulator, leaves it running
see also dsm_rstb Reg01h<13> to disable the
modulator
4
R/W Reserved
0
5
R/W Reserved
6
R/W dsm_xref_sin_select
7
R/W dsm_autoseed
9:8
R/W dsm_order
13:10
17:14
R/W dsm_quant_max
R/W dsm_quant_min
0
0
when xref is selected specifies that the sine
source is used
1
automatic seed load when changing the frac
part, uses value in seed
Delta-Sigma Modulator configuration:
00-1st order 01-2nd order 10-3rd order Feedback
2
11-3rd order Feedforward
Use either 10 or 11. For Sweeper operation use
11 only.
Do not use 1st or 2nd order (for test only)
3h
max value allowed out of Δ∑ modulator quantizer
limits are +7 to -8, typ ±3 or ±4 Program 3h
Ch
min value allowed out of Δ∑ modulator quantizer
limits are +7 to -8, typ ±3 or ±4 Program Ch
Table 30. Reg 14h CW Sweep Control Register
The maximum sweep range is limited to 255 x Fxtal/R. Delta-Sigma Modulator mode should be Feed
Forward when using Sweep feature (Register 12h Bits [9:8] = 11.
Bit
Type
Name
Default
Description
0
R/W clear_ovf_undf
0
asynchronous clear for ovf/undf flags
1
R/W ramp_enable
0
Ramp En/rstb
1= enables the CW Ramp Function
2
R/W ramp_trigg
Write always triggers ramps if bit <2> = 0, if bit
0
<2> = 1, Ramp will not trigger, bit <2> must be
reset to 0 first
3
R/W ramp_repeat_en
Ramp Repeat Seq enable
0
1= enables autotrigger of ramps
0 = ramp_trigg starts each ramp
4
R/W ramp_startdir_dn
Ramp start direction
0
1= Start with Ramp Down
0= Start with Ramp Up
5
R/W ramp_trig_ext_en
0
Enable hardware trigger on GPO3 pin
6
R/W ramp_singlestep
0
Ramp single step, advances the ramp to the next
step, and holds frequency
7
R/W ramp_singledir
0
Ramps in one direction only with hop to start at
end of ramp
33
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