SKY73126-31 Datasheet, PDF (5/14 Pages) Skyworks Solutions Inc. – 161.92 MHz High Performance VCO/Synthesizer

DATA SHEET • SKY73126-31 VCO/SYNTHESIZER
Table 5. Word 1: Operation Mode Hold Register (2 of 2)
Parameter
Function
State Description
pd_polar
cp_tristate
nr_sel
pll_en
ref_bw_sel
pre_curr_sel
prescale_sel
rdiv
rsvd
Polarity of the phase detector [9]
Tri-states the transmit PLL charge
pump [10]
Internal operating voltage control bit
for the N-counter and R-divider [11]
Note: this bit needs to be programmed
together with Word 1, bit [12], and
Word 2, bit [25].
Internal operating voltage control bit
for the PLL [12]
Note: this bit needs to be programmed
together with Word 1, bit [11], and
Word 2, bit [25].
Reference buffer bandwidth [14:13]
Prescaler current bias [16:15]
Prescaler mode select [17]
Reference divider ratio [27:18]
Reserved [31:28]
Bit [9]:
0 = negative
1 = positive
Bit [10]:
0 = charge pump functional
1 = charge pump disabled/tri-stated
Word 1 Word 1 Word 2
Bit [12] Bit [11] Bit [25]: N-Cntr/R-Divider Mod Dig
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
See nr_sel parameter (bit [11])
Bits [14:13]:
0 0 = 20 MHz
0 1 = 30 MHz
1 0 = 40 MHz
1 1 = 50 MHz
Bits [16:15]:
0 0 = 20 A
0 1 = 22 A
1 0 = 24 A
1 1 = 26 A
Bit [17]:
0 = Prescaler in 8/9 divide mode
1 = Prescaler in 16/17 divide mode
Bits [27:18]: represents the 10-bit reference divider, R1
[9:0]. Refer to the Synthesizer Programming section of
this Data Sheet for information.
Reserved
Recommended
Operational Value
(Binary)
0
Default Value
(Binary)
0
0
0
0
0
1
0
Application
00
dependent
00
00
Application
dependent
Application
dependent
0000
0
0000000000
0000
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201112C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 24, 2010
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