SKY73126-31 Datasheet, PDF (6/14 Pages) Skyworks Solutions Inc. – 161.92 MHz High Performance VCO/Synthesizer

DATA SHEET • SKY73126-31 VCO/SYNTHESIZER
Table 6. Word 2: DPLL Control Hold Register
Parameter
Function
State Description
wd_3, wd_2, wd_1,
wd_0
dpll_ctrl
Address bits [3:0]. Must be set to
0010b (see Table 3).
DPLL control [21:4]
Reserved
test_mux
sd_sel
rsvd
Lock detect and diagnostic output
select [24:22]
Note: Logic output is via LD signal
(pin 12)
Internal operating voltage control bit
for the synthesizer [25]
Note: this bit needs to be programmed
together with Word 1, bit [11], and
Word 1, bit [12].
Reserved [31:26]
Bits [24:22]:
0 0 0 = lock detect output or vendor ID read-back
0 0 1 = R-divider output
0 1 0 = N-divider output
0 1 1 = capacitor overflow
1 0 0 = capacitor underflow
1 0 1 = VCO high comparator
1 1 0 = VCO low comparator
1 1 1 = DPLL test
Note: When test_mux = 000, the vendor ID is output to
pin 12 if vendor ID read-back has been initialized.
Otherwise, when test_mux = 000, pin 12 outputs the
lock detect signal.
See nr_sel parameter (Word 1, bit [11])
Reserved
Recommended
Operational Value
(Binary)
0010
Default Value
(Binary)
0010
–
00000000000
0000000
000
000
0
0
000000
000000
Table 7. Word 3: Frequency Control Hold Register (1 of 2)
Parameter
Function
State Description
wd_3, wd_2, wd_1,
wd_0
dpll_en
Address bits [3:0]. Must be set to
0011b (see Table 3).
VCO auto tuning enable flag [4]
ndiv
N-divider/prescaler mode for control
of M and A counters [20:5]
Bit [4]:
0 = disable VCO auto tuning
1 = enable VCO auto tuning
Bits [20:5]:
For 8/9 prescaler mode:
bits [7:5] = A-counter bits [2:0] (bit [3] = 0)
bits [19:8] = M-counter bits [11:0]
bit [20] = 0
For 16/17 prescaler mode:
bits [8:5] = A-counter bits [3:0]
bits [20:9] = M-counter bits [11:0]
Recommended
Operational Value
(Binary)
0011
Default Value
(Binary)
0011
Refer to Figure 7
0
Application
dependent
00000000000
00000
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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February 24, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201112C