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PDF SKY73103-11 Data sheet ( Hoja de datos )
| Número de pieza | SKY73103-11 | |
| Descripción | High Performance VCO/Synthesizer | |
| Fabricantes | Skyworks | |
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DATA SHEET
SKY73103-11: 1460-1665 MHz High Performance
VCO/Synthesizer With Integrated Switch
Applications
x 2G, 2.5G, and 3G base station transceivers:
GSM, EDGE, CDMA, WCDMA
x General purpose RF systems
Features
x Wideband frequency operation: 1460 to 1665 MHz
x Process-tolerant compensation for VCO
x 24-bit 6' fractional-N synthesizer
x Ultra-fine frequency resolution of 0.001 ppm
x Flexible reference frequency selection
x Three-wire serial interface up to 20 MHz clock frequency
x Integrated PLL supply regulation for spur isolation
x MCM (38-pin, 9 x 12 mm) SMT package (MSL3, 260 qC per
JEDEC J-STD-020)
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances) compliant packaging.
Description
Skyworks SKY73103-11 Voltage-Controlled Oscillator
(VCO)/Synthesizer is a fully integrated, high performance signal
source for high dynamic range transceivers. The device provides
ultra-fine frequency resolution, fast switching speed, and low
phase noise performance for 2G, 2.5G, and 3G base station
transceivers.
The SKY73103-11 VCO/Synthesizer is a key building block for
high-performance radio system designs that require low power
and a fine step size. Reference clock generators with an output
frequency up to 52 MHz can be used with the SKY73103-11. The
input clock frequency is divided down by programmable dividers
(1 to 8) for the synthesizer. The phase detector can operate at a
maximum speed of 26 MHz, which allows better phase noise due
to the lower division value.
The SKY73103-11 VCO/Synthesizer is provided in a compact, 38-
pin Multi-Chip Module (MCM). The device package and pinout are
shown in Figure 1. A functional block diagram is shown in
Figure 2. Signal pin assignments and functional pin descriptions
are provided in Table 1.
38 37 36 35 34 33 32 31 30
GND 1
GND 2
GND 3
SW_EN 4
GND 5
GND 6
GND 7
GND 8
GND 9
RF_OUT 10
29 GND
28 GND
27 N/C
26 GND
25 GND
24 GND
23 FREF
22 LD
21 N/C
20 GND
11 12 13 14 15 16 17 18 19
S958
Figure 1. SKY73103-11 Pinout– 38-Pin MCM Package
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200649D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 30, 2009
1
1 page  
DATA SHEET • SKY73103-11 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
test_mux
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 R-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]
Lock detect and diagnostic output select
[17:15]
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
Bit [7]:
0 = negative
1 = positive
Bit [8]:
0 = charge pump in normal functional mode
1 = charge pump disabled/tri-stated
Reserved
Bit [12] Bit [11] Bit [10]: N-Cntr/R-Divider Mod Dig
Voltage
Voltage
0X
10
10
11
11
X=
0=
1=
0=
1=
0V
1.8 V
1.8 V
2.4 V
2.4 V
0V
1.8 V
2.4 V
1.8 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
Bits [17:15]:
0 0 0 = lock detect output
0 0 1 = R-divider output
0 1 0 = N-divider output
0 1 1 = not used
1 0 0 = not used
1 0 1 = not used
1 1 0 = not used
1 1 1 = DPLL test
Recommended
Operational Value
(Binary)
00
Application
dependent
(see Table 11)
00
0
0
0
100
–
–
Application
dependent
(see Table 11)
000
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200649D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 30, 2009
5
5 Page 
DATA SHEET • SKY73103-11 VCO/SYNTHESIZER
Here, N is not equal to Nactual. The A-counter portion only uses the
three LSBs (the 4th bit of the A-counter is a “don’t care” bit).
The fractional divisor code (FN) sets the fractional-N modulo up to
256 modulo according to the following equation:
FN actual
D7 ¨¨©§
1
2
¸¸¹·
D6 ¨¨©§
1
22
¸¸¹·
D5 ¨¨©§
1
23
¸¸¹·
x
x
x
D0 ¨¨©§
1
28
¸¸¹·
(4)
The value of FN is equal to the binary representation of 256 (or 28)
u FNactual, or:
FN = D7 u 27 + D6 u 26 + D5 u 25+ . . . D0
The fractional modulo can be extended up to 223 using the modulo
extender (ME) if required:
MEactual = D14(1/29) + D13(1/210) + D12(1/211) + . . . + D0(1/223)
The value of ME is equal to the binary representation of the
integer part of 223 u MEactual, or:
ME = D14 u 214 + D13 u 213 + D12 u 212 + . . .D0
Example:
A desired synthesizer frequency of 1537.25 MHz is required using
a crystal frequency of 16 MHz and a 16/17 prescaler. Since the
maximum internal reference frequency is 25 MHz, the crystal
frequency does not need to be divided. However, a reference
divider ratio of 2 is used for this example.
Restating Equation 2 as a function of DTotal:
DTotal = (1537.26 u 2)/16 = 192.1575
Where: RF = 1537.26
R1 = 2
FREF = 16
Determine Nactual by subtracting 3.5 from DTotal and removing the
fractional portion:
DTotal – 3.5 = 188.6575
Using Equation 3:
Nactual = 188 = Mactual u P + Aactual
Where: Mactual = 11
P = 16
Aactual = 12
M = Mactual = 11 = 001011b (the six MSBs)
A = Aactual = 12 = 1100b (the four LSBs)
N = M u 24 + A = 0010111100b (this is the same as Nactual)
Multiply the fractional portion that was removed in the previous
step by 256 and remove the fractional portion of the result to
determine FN:
0.6575 u 256 = 168.32
FN = 168 = 10101000b
Divide FN by 256 to determine the actual fractional part, FNactual:
FNactual = 168/256 = 0.65625
Subtract this result from the fractional portion of (DTotal – 3.5) to
determine the actual fractional modulus extender, MEactual:
MEactual = (DTotal – 3.5 – Nactual) – FNactual
= 0.6575 – 0.65625
= 0.00125
Multiply this result by 8388608 (the 23-bit '6 modulator value,
223) and remove the fractional portion to determine the value of
ME:
0.00125 u 8388608 = 10485.76
ME = 10485 = 010100011110101b
Package and Handling Information
Since the device package is sensitive to moisture absorption, it is
baked and vacuum packed before shipping. Instructions on the
shipping container label regarding exposure to moisture after the
container seal is broken must be followed. Otherwise, problems
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
The SKY73103-11 is rated to Moisture Sensitivity Level 3 (MSL3)
at 260 qC. It can be used for lead or lead-free soldering. For
additional information, refer to Skyworks Application Note, PCB
Design and SMT Assembly/Rework Guidelines for MCM-L
Packages, document number 101752.
Care must be taken when attaching this product, whether it is
done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format. For packaging details, refer to the Skyworks
Application Note, Tape and Reel, document number 101568.
Circuit Design Considerations
The following design considerations are general in nature and
must be followed regardless of final use or configuration
1. Paths to ground should be made as short and as low
impedance as possible.
2. The ground pad of the SKY73103-11 provides critical
electrical grounding requirements. Design the connection to
the ground pad to provide the best electrical connection to the
circuit board. Multiple vias to the grounding layer are
recommended to connect the top layer ground area to the
main ground layer.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200649D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 30, 2009
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet SKY73103-11.PDF ] | |
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