HMC701LP6CE Datasheet, PDF (35/46 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N Synthesizer

v03.0709
HMC701LP6CE
8 GHz 16-Bit Fractional-N Synthesizer
11
Typical Step Tuned VCO Register Map
Step Tuned VCO Registers Example
Note: HMC step tuned VCOs come in different configurations. The following four registers give
examples of typical control registers in HMC step tuned VCOs. Consult the VCO data sheet to
confirm available VCO features.
Table 6. VSPI Format
Bit
Name
[2:0] VCO ID
[6:3] VCO Register Address
[15:7] VCO Data
Width
3
4
9
Default
n/a
n/a
n/a
Description
VCO Address, MSB First
VCO Register Address
VCO Data Bits
Table 7. VCO R00 (Switch Controller Register)
Bit
Name
Width Default
[0]
Enable Calibration
1
0
[6:1] Tune control
[8:7] Not Used
6
100000
b
2
Description
Reserved for Calibration mode, forces a locally
generated temperature compensated voltage on the VCO
tuning port
6 bit tuning control
000000 minimum tuning capacitance
000001 next to minimum
...
111111 maximum tuning capacitance
Not Used
Table 8. VCO R01 (Enable Register)
Bit
Name
Width
[3:0] Reserved
4
[4]
PLL Buffer En
1
[5]
Divider En
1
[6]
Buffer En
1
[7]
VCO En
1
Global En
[8]
1
Default
x
1
1
1
1
1
Description
Reserved
PLL Buffer Enable (Low power output to PLL)
Divider Enable (if present)
Buffer Enable (High power RF output to application)
VCO Enable
Global Enable
0: Forces all cells to power down state
1: Enables individual Cell state control via bits 4 thru 7.
Table 9. VCO R02 (Bias Control Register)
Bit
Name
Width
[1:0]
PLL Buffer Bias Bits
(MSB:LSB)
2
[3:2]
Divider or Doubler Bias Bits
(MSB:LSB), if present in VCO
2
[5:4]
Mixer Buffer Bias Bits
(MSB:LSB)
2
[8:6] Reserved
3
Default
1
00
00
0: Min Bias
1: Next to min bias
2: Next to max bias
3: Max Bias
0: Min Bias
1: Next to min bias
2: Next to max bias
3: Max Bias
0: Min Bias
1: Next to min bias
2: Next to max bias
3: Max Bias
Description
11 - 36
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