SKY73121-11 Datasheet, PDF (1/22 Pages) Skyworks Solutions Inc. – 1805 - 1890 MHz High Performance VCO/Synthesizer With Integrated Switch

DATA SHEET
SKY73121-11: 1805–1890 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 Frequency operation range: 1805 to 1890 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)
Description
Skyworks SKY73121-11 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 SKY73121-11 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 SKY73121-11. A
functional block diagram is shown in Figure 1. As indicated in this
diagram, the reference frequency is divided down by 1, 2, 4, or 8
in the R1 divider, depending on the value of the reference divisor
input (R1). Refer to the Reference Input Divider section (page 10)
for more information.
The SKY73121-11 VCO/Synthesizer is provided in a compact,
38-pin Multi-Chip Module (MCM). The device package and pinout
are shown in Figure 2. Signal pin assignments and functional pin
descriptions are provided in Table 1.
Vtune
FREF
7
LD
Lr
VCO Out +
Lr
Cal
2
2
Buffer
2
VCO Out –
7
cap [6:0]
Flag
Vtune
PLL
Low Pass Filter
SR Out +
2
SR Out –
R1
R1
Divider
SP1
SC1
CPO RF
RF
RF Charge
PFD
Pump
N
3-Wire
Serial
Interface
PS
Mux
FN
(LD/Test)
ME
N
Divider
P/P+1
Prescaler
ΔΣ
Modulator
Divide-by-2
Digital
Coarse
Calibration
cap [6:0]
7
Calibration
Complete
RFIN
RFINB
Z = 1:4
Figure 1. SKY73121-11 Functional Block Diagram
RF Output
SW_EN
CLK
LE
DAT
S1040
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
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