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PDF SKY73100 Data sheet ( Hoja de datos )
| Número de pieza | SKY73100 | |
| Descripción | High Performance VCO/Synthesizer | |
| Fabricantes | Skyworks Solutions | |
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SKY73100: 865-960 MHz High Performance VCO/Synthesizer
With Integrated Switch
Applications
• 2G, 2.5G, and 3G base station transceivers:
− GSM, EDGE, CDMA, WCDMA
• General purpose RF systems
Features
• Wideband frequency operation: 865 to 960 MHz
• Process-tolerant compensation for VCO
• 24-bit Σ∆ fractional-N synthesizer
• Ultra-fine frequency resolution of 0.001 ppm
• Flexible reference frequency selection
• Three-wire serial interface up to 20 MHz clock frequency
• Integrated PLL supply regulation for spur isolation
• MCM (38-pin, 9 x 12 mm) Pb-free free (MSL3, 260 °C per
JEDEC J-STD-020) SMT package
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances) compliant packaging.
Description
Skyworks SKY73100 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 SKY73100 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 SKY73100. 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 SKY73100 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. SKY73100 Pinout– 38-Pin MCM Package
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200361A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 20, 2007
1
1 page  
PRELIMINARY DATA SHEET • SKY73100 VCO/SYNTHESIZER
Lock Detect
Lowcwkwd.eDteactatiSohneceitr4cUu.itcroymprovides a CMOS logic level indication
when the PLL is frequency locked (high when locked).
Reference Input Divider
The R-counter (reference input clock divider) consists of three
divide-by-two blocks and one multiplexer controlled by the
RDIV[1:0] parameter in Legacy Word 2. The R-counter is used to
select a divide-by-one to a divide-by-eight function.
Synthesizer Output Switch
An on-chip switch is integrated into the SKY73100 RF output after
the balun and is controlled by the SW_EN signal (pin 4) as
indicated below:
SW_EN Input
High
Low
Synthesizer Output
On
Off
The switch provides >50 dB isolation at the synthesizer RF
output. This allows the SKY73100 to be used for GSM
applications.
Synthesizer Programming
To program the synthesizer to the correct frequency, values for
the N-counter (both M and A portions), fractional divisor (FN), and
fractional modulus extender (ME) are needed. These values are
used to determine the total divider ratio, DTotal, according to
Equation 1:
DTotal = Nactual + FNactual + MEactual + 3.5
(1)
Where: Nactual = the actual value of the N-counter
FNactual = the actual fractional divisor
MEactual = the actual fractional modulus extender
Because of the way the ∆Σ modulator is implemented in the
SKY73103, the number 3.5 must be added to the division number
to obtain the final division ratio.
The calculated value for DTotal can then be used to determine the
correct synthesizer frequency, RF:
RF
=
FREF
R1
× DTotal
(2)
Where: FREF = the reference frequency
R1 = the reference divider radio
The 6-bit M-counter and the 4-bit A-counter portions of the N-
counter are calculated according to the following relationships:
Nactual is the actual N-counter value and is the integer portion of
(DTotal – 3.5):
Nactual = Mactual × P + Aactual
(3)
If: M = Mactual (binary number, fit to six bits)
A = Aactual (binary number, fit to four bits)
Then: N = M × 24 + A
Where: N is the number to be programmed into the N-counter.
The synthesizer has a selectable prescaler of 8/9 or 16/17. If the
16/17 prescaler is used:
P = 24 = 16
In this case, N is the same as Nactual, M is equal to the six MSBs of
Nactual, and A is equal to the four LSBs of Nactual.
If the 8/9 prescaler is used:
P=8
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
⎟⎟⎠⎞
+
D6 ⎜⎜⎝⎛
1
22
⎟⎟⎠⎞
+
D5 ⎜⎜⎝⎛
1
23
⎟⎟⎠⎞
+
•
•
•
+
D0 ⎜⎜⎝⎛
1
28
⎟⎟⎠⎞
(4)
The value of FN is equal to the binary representation of 256 (or 28)
× FNactual, or:
FN = D7 × 27 + D6 × 26 + D5 × 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 × MEactual, or:
ME = D14 × 214 + D13 × 213 + D12 × 212 + . . .D0
Example 1:
A desired synthesizer frequency of 2640.45 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 = (2640.45 × 2)/16 = 330.05625
Where: RF = 2640.45
R1 = 2
FREF = 16
Determine Nactual by subtracting 3.5 from DTotal and removing the
fractional portion:
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200361A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 20, 2007
5
5 Page 
PRELIMINARY DATA SHEET • SKY73100 VCO/SYNTHESIZER
www.DataSheet4U.com
Pin 1 Indicator
9
0.15 A B C
Top View
B
C
12
18X 5.9
4X 4.5
4X 3.5
4X 2.5
4X 1.5
4X 0.5
2X 1.25
See Detail E
2X 3.75
C
1.75 ± 0.1
A
0.1
Side View
B
0
Bottom View
38X SMT Pad
0.1 A B C
Pin 38
Pin 1 Indicator
See Detail D
Pin 1
A
0
8X Solder Mask Openings
0.2 A B C
0.5 ± 0.1
(0.1)
2X (0.1)
0.65 ± 0.1
Metal Pad Edge
0.5 ± 0.05
Metal Pad Edge
Solder Mask Edges
Detail A
3.375
Metal Pad Edge
0.2 x 0.2
0.5 ± 0.1
0.5 ± 0.1
Detail B
2X (0.1)
0.65 ± 0.1
Detail C
3.375
2.375
All measurements are in millimeters.
Detail D
Dimensioning and tolerancing according to ASME Y14.5M-1994.
Solder Mask Edges
2.375
Detail E
Solder Mask Edges
Figure 8. SKY73100 38-Pin MCM Package Dimensions
S960
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200361A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 20, 2007
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SKY73100.PDF ] | |
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