HMC701LP6CE Datasheet, PDF (39/46 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N Synthesizer

v03.0709
HMC701LP6CE
8 GHz 16-Bit Fractional-N Synthesizer
11
Table 19. Reg 08h Charge Pump Trim & Offset Register
Bit
Type
Name
Default
Description
3:0
R/W cp_UPtrim_sel
0
Trim Up gain, 14.3uA lsb, binary, 100uA max
7:4
R/W cp_DNtrim_sel
0
Trim Dn gain, 14.3uA lsb, binary, 100uA max
11:8
R/W cp_UPoffset_sel
4
Up Offset leakage current, 28.7uA lsb, binary,
430uA max
15:12
R/W cp_DNoffset_sel
0
Dn Offset leakage current, 28.7uA , binary,
430uAmax
17:16
R/W cp_amp_bias_sel
2
Charge Pump Dummy Branch Op amp bias
selection, 100uA
Table 20. Reg 09h Charge Pump EN Register
Bit
Type
Name
Default
0
R/W cp_pull_updn_en
0
1
R/W cp_pull_dn_upb
0
Description
Enables CP UP/Down Control Reg09 ^[1]
0 - Forces Charge Pump Up when Reg09[0]=1
1 - Forces Charge Pump DN when Reg09[0]=1
Table 21. Reg 0Ah VCO Auto Tune & Control Register
Bit
Type
Name
Default
Description
0
R/W vcot_auto_start
0
Enables Auto start of VCO cap tuning when frac
word is written to spi
1
R/W vcot_man_start
0
Starts manual vco tuning when auto_start=0
(must be cleared to 0 before another tune)
5:2
R/W vcot_ncyc_rdiv
Exponent selection for number of rdiv cycles to
2
wait during measurement (effects time to perform
the measurement and hence the accuracy)
6
R/W vcot_invert_outdata
0
Inverts the vco tuning cap polarity
7
R/W vcot_swap_outdata
0
Swaps the cap tuning data (left-to-right)
8
R/W vcot_force_data_en
0
Force enable for the VCO tuning cap word -
Obsolete
9
R/W vcot_force_dblbuff_mode
0
Enables double buffer for vco caps. Caps will go
to the vco when dsm_frac reg is written
11:10
R/W vcot_xrefdiv_sel
xref divider generate vco tuning calibration
clock, and VCO Serial Port Clock VSCK from the
crystal input (see Figure 10) . This divider affects
calibration time and accuracy, currently only
0
divby1 is supported
00-->div by 1
01-->div by 2 not supported
10-->div by 4 not supported
11-->div by 8 not supported
Table 22. Reg 0Bh VCO Tuning & Control Register
Bit
Type
Name
Default
Description
15:0
R/W spivco_direct_data
0
Used to set VCO control settings VCO Specific,
see VCO SERIAL PORT description
11 - 40
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