HMC700LP4 Datasheet, PDF (31/36 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N PLL

v07.0411
HMC701LP6CE
8 GHz 16-Bit Fractional-N PLL
0
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
Table 31. Reg 15h CW Sweep Ramp Step 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
23:0
R/W ramp_step
2048 Ramp Step size
Table 32. Reg 16h CW Sweep Ramp Step Number 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
23:0
R/W ramp_steps_number
2048 Ramp Number of steps in ramp
Table 33. Reg 17h CW Sweep Dwell Time Register
Bit
Type
Name
Default
Description
23:0
R/W ramp_dwell_time
2048
Ramp Number of cycles to hold at top/bottom
in repeat mode
0 - 31
[1] Phase-Error Measurement and Compensation in PLL Frequency Synthesizers for FMCW, Sensors—I: Context and Application, Pichler, Stelzer,
Member, IEEE, Seisenberger, and Vossiek, IEEE Transactions on Circuits and Systems—I, VOL. 54, No. 5, May 2007
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