HMC701LP6CE Datasheet, PDF (40/46 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N Synthesizer

v03.0709
HMC701LP6CE
8 GHz 16-Bit Fractional-N Synthesizer
Table 23. Reg 0Ch VCO Auto Tune Wait Register
Bit
Type
Name
Default
13:0
R/W vcot_initial_wait
256
Description
Initial wait time (xtal cycles) after tri-stating
charge-pump to start VCO tuning
Table 24. Reg 0Dh VCO Control Register
Bit
Type
Name
1:0
R/W spivco_mode
3:2
R/W f1_modesel
5:4
R/W sar_bits_number
6
R/W autocal_when_unlocked
Default
0
0
0
0
Description
Support for different VCO SPI formats
0: 16-bit VSPI
1: 10-bit VSPI with 5-bit SAR
2: 10-bit VSPI with 6-bit SAR
3: blank VCOSPI data
CSP Speedup Function Increases CSP current
when Lock Detect window exceeds threshold
0: disabled
1: 1nsec threshold
2: 3nsec threshold
3: 5nsec threshold
Autotune Successive Approximation Register
(SAR)
Autotune Algorithm supports VCOs with 5, 6, 7
or 8-bit step tuning
8-n = SAR bits
0: 8 bit SAR
1: 7 bit SAR
2: 6 bit SAR
3: 5 bit SAR
0 : disabled
1: automatically runs the autotuning routine to
relock the VCO if loss of lock is detected
Table 25. Reg 0Eh Reserved
Bit
Type
Name
23:0
R/W Reserved
Default
0
Reserved
Description
Table 26. Reg 0Fh Integer Division Register
Bit
Type
Name
Default
15:0
R/W dsm_intg
200d
Description
unsigned integer portion of VCO divider value,
also known as N_INT, see (EQ 12)
Table 27. Reg 10h Fractional Division Register
Bit
Type
Name
Default
23:0
R/W dsm_frac
0
Description
unsigned fractional portion of VCO divider also
known as N_FRAC, see (EQ 12)
Table 28. Reg 11h Seed Register
Bit
Type
Name
23:0
R/W dsm_seed
Default
0
Description
unsigned seed value for Δ∑ modulator
sets the start phase of the modulator
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]
Order On-line at www.hittite.com
11
11 - 41