SKY73121-11 Datasheet, PDF (5/22 Pages) Skyworks Solutions Inc. – 1805 - 1890 MHz High Performance VCO/Synthesizer With Integrated Switch

DATA SHEET • SKY73121-11 VCO/SYNTHESIZER
Table 4. Load Register Word 0 (Programs the Operation Mode Register) (1 of 2)
Parameter
Function
State Description
wd_0, wd_1
cp_output
cp_delay
pd_polar
cp_tristate
rsvd
sd_sel
nr_sel
pll_en
ref_bw_sel
Address bits [1:0]. Must be set to 00b (see
Table 3)
Charge pump setting [4:2]
Charge pump delay [6:5]
Polarity of phase detector [7]
Tri-state selection for the transmit PLL
charge pump output [8]
Reserved [9]
Internal operating voltage control bit for 6'
synthesizer [10]
Note: this bit needs to be programmed
together with bits [11] and [12].
Internal operating voltage control bit for N-
counter and R1 divider [11]
See sd_sel parameter (bit [10])
Internal operating voltage control bit for PLL
[12]
See sd_sel parameter (bit [10])
Reference buffer bandwidth [14:13]
Bits [4:2]:
0 0 0 = 200 PA
0 0 1 = 400 PA
0 1 0 = 600 PA
0 1 1 = 800 PA
1 0 0 = 1000 PA
1 0 1 = 1200 PA
1 1 0 = 1400 PA
1 1 1 = 1600 PA
Bits [6:5]:
0 0 = 2 nsec
0 1 = 4 nsec
1 0 = 7 nsec
1 1 = 9 nsec
NOTE: this device is fixed at 2 nsec.
Bit [7]:
0 = Negative
1 = Positive
NOTE: this device is fixed at negative polarity.
Bit [8]:
0 = Charge pump in normal functional mode
1 = Charge pump disabled/tri-stated
Reserved
Bit [12] Bit [11] Bit [10]: N-Cntr/R1-Divider ΣΔ Mod
Voltage
Voltage
0
X
X = 0V
0V
1
0
0 = 1.8 V
1.8 V
1
0
1 = 1.8 V
2.4 V
1
1
0 = 2.4 V
1.8 V
1
1
1 = 2.4 V
2.4 V
This bit needs to be programmed together with bits [10] and [12].
This bit needs to be programmed together with bits [10] and [11].
Bits [14:13]:
0 0 = 20 MHz
0 1 = 30 MHz
1 0 = 40 MHz
1 1 = 50 MHz
Recommended
Operational Value
(Binary)
00
Application
dependent
00
0
0
0
100
–
–
11
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200888B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 1, 2009
5