SKY73208-11 DataSheet - Skyworks Solutions, Inc.

DATA SHEET
SKY73208-11: 350-5000 MHz Wideband Receive Mixer with
Integrated Integer-N PLL and VCO
Applications
Description
• Cellular base station systems: GSM/EDGE, CDMA2000, WCDMA,
TD-SCDMA
Skyworks SKY73208-11 is a fully integrated wideband receive
downconverter that includes a high linearity mixer and a complete
Voltage Controlled Oscillator (VCO), synthesizer, and Local
Oscillator (LO) chain. A low loss RF balun has also been included
to reduce design complications and to lower system cost.
• Other wireless communication systems
Features
• RF frequency range: 350 to 5000 MHz
• IF frequency range: 50 to 500 MHz
• Conversion gain: 6 dB
• IIP3: +26 dBm; OIP3: +32 dBm
• Noise Figure: 14 dB
• Integrated RF balun
• Integer-N frequency synthesizer
• Low phase-noise VCO
• Low RF output comparison spurs
• Programmable 18-bit N-counter and 11-bit R-counter
• Wide range of reference frequencies
• Programmable charge pump currents
• Flexible configuration that allows connection to an external VCO
or PLL
• Digital lock detector
• Power supply for mixer: 5 V; power supply for synthesizer: 3.3 V
• Small, low-cost MCM (36-pin, 6 x 6 mm) SMT package (MSL3,
260 °C per JEDEC J-STD-020)
The SKY73208-11 features a 3rd Order Input Intercept Point (IIP3)
of +26 dBm and a Noise Figure (NF) of 14 dB, which make the
device an ideal solution for high dynamic range systems such as
2G/3G base station receivers.
The SKY73208-11 also includes a fully integrated wideband
VCO/Integer-N frequency synthesizer. The device includes four
differential VCOs that cover the output frequency range from
2.8 GHz to 6.0 GHz. By applying internal VCO division, the output
LO frequency can be set to the desired value while minimizing the
phase noise. The direct, non-divided internal VCO frequency can
also be monitored at the bidirectional VCO pins.
The flexible SKY73208-11 LO configuration allows the loop to be
locked by an external VCO or external Phase Locked Loop (PLL),
or the device can use the divider chain only. The SKY73208-11 is
controlled by a Serial Peripheral Interface (SPI).
The SKY73208-11 is manufactured using a robust silicon BiCMOS
process and has been designed for optimum long-term reliability.
It is manufactured in a compact, 36-pin 6 x 6 mm Multi-Chip
Module (MCM). A functional block diagram is shown in Figure 1.
The pin configuration and package are shown in Figure 2. Signal
pin assignments and functional pin descriptions are provided in
Table 1.
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Figure 1. SKY73208-11 Block Diagram
Figure 2. SKY73208-11 Pinout – 36-Pin MCM
(Top View)
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Table 1. SKY73208-11 Signal Descriptions
Pin #
Name
Description
Pin #
19
Name
Description
1
LD
Lock detect output
OUT_BUFN
LO negative output
2
VDD_DIG
+3.3 V supply for digital blocks
3
VDD_CLK
+3.3 V supply for reference buffer
20
OUT_BUFP
LO positive output
21
GND
Ground
4
REF_CLK
Reference clock input
22
VDD_LO
+5 V supply for mixer LO buffer
5
EXT_VCO_INP
External VCO positive input
23
IF_OUTN
Negative IF output
6
EXT_VCO_INN
External VCO negative input
24
IF_OUTP
Positive IF output
7
LE
Latch enable input for SPI
25
VDD_IF
+5 V supply for mixer output
8
DATA
Data input for SPI
26
EXT_PD
Power-down control pin for mixer
9
CLK
Clock input for SPI
27
MIX_RES
External bias resistor for mixer
10
N/C
No connection
28
VDD_MIXBIAS
+5 V supply for mixer bias
11
N/C
No connection
29
RF_IN
RF mixer input
12
N/C
No connection
30
LO_RES
External bias resistor for LO chain
13
N/C
No connection
31
VDD_MIX
+5 V supply for mixer
14
N/C
No connection
32
VDD_DIV
+3.3 V supply for LO dividers
15
GND
Ground
33
VCTRL
Tuning voltage for VCO
16
VDD_VCO
+3.3 V supply for VCO
34
VDD_PLL
+3.3 V supply for PLL
17
VCO_RES
External 15 kΩ resistor to set VCO bias
35
VDD_CP
+3.3 V supply for charge pump
18
VDD_OBUF
+3.3 V supply for output LO buffer
36
ICP
Charge pump output
Functional Description
R-Divider
The SKY73208-11 is comprised of four main functional blocks:
The 11-bit programmable R-divider divides the reference input
frequency and generates the reference input for the phase
detector. The R-divider range varies from 1 to 211 –1 (= 2047).
• RF mixer
• Synthesizer
N-Divider
• VCO
• VCO dividers and LO chain
RF Mixer
The high linearity SKY73208-11 integrates an active, double
balanced mixer that provides good noise performance and an
excellent 3rd Order Input Intercept Point (IIP3).
The balanced nature of the mixer also provides for high port-toport isolation. A wideband match to 50 Ω is provided internally,
which eliminates the need for any external matching components
except for a coupling capacitor.
The IF outputs are designed for a 200 Ω differential impedance
and require off-chip matching.
The N-divider consists of a selectable 16/17 or 32/33 prescaler,
13-bit main counter, and 5-bit swallow counter. The 18-bit Ndivider ratio is calculated as:
N=P×M+S
Where: P = Prescaler value
M = Main counter value
S = Swallow counter value
The N-divider range is from P2 to 218 – 1. For a 32/33 prescaler,
the N-divider range varies from 1024 to 262143.
Phase Detector
Synthesizer
The phase detector is an edge-controlled digital circuit. The circuit
has two inputs: the reference signal (Ref) and the N-divider output.
There are two digital outputs (Up and Dn) that drive the charge
pump.
The frequency synthesizer is composed of the R-divider, Ndivider, phase detector, charge pump, and lock detector.
When the input phase difference is positive, the Up output is
pulled up to VDD. When the input phase difference is negative, the
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Dn output is pulled down to ground. This type of phase detector
acts only on the positive edges of the input signals.
port is at pins 5 and 6 (EXT_VCO_INP and EXT_VCO_INN,
respectively).
Charge Pump
If single-ended input is required, one of the pins can be grounded
or an external balun can be used. The register settings to enable
this mode of operation are detailed in the Skyworks document,
Wideband, Integer-N Phase-Locked Loop Programming Guide,
document #201322.
The charge pump is used to convert the logic levels of the Up and
Dn pulses, carrying the phase error between the reference and the
divided signal into analog quantities/current pulses.
The output of the SKY73208-11 charge pump is programmable
and varies between 1.2 mA and 7.2 mA. Additional adjustment of
the charge pump current can be accomplished by changing the
value of the external PLL bias resistor.
Lock Detector
The lock detector circuit is activated when the phase difference
between the Up and Dn phase detector signals for a given number
of comparison cycles is shorter than a fixed delay. The CMOS
output is active high when the loop is locked. The lock detector
can be monitored from pin 1 (LD).
LO Output
It is possible to monitor the LO signal (either the internally
generated LO or an externally applied LO) or route the signal to
another device that requires the same LO frequency. The
differential LO output is available at pins 19 and 20 (OUTBUFN and
OUTBUFP, respectively) using external coupling capacitors.
If single-ended output is desired, use pin 19 or an external balun.
This feature does not require any specific register bit setting and
these pins can be left floating if not used.
VCO
Digital Interface
The VCO is designed to generate the LO signal with the tuning
function controlled by the synthesizer.
A three-wire SPI provides mode and bias control, and control of
the PLL. The serial interface consists of three signals: the bus
clock (CLK), latch enable (LE), and the serial data line (DATA).
VCO Dividers and LO Chain
A write data stream consists of 25 bits:
The divider chain consists of dividers and LO drivers.
Bits[15:0] provide the 16-bit data block.
The direct, non-divided VCO output can be monitored at the bidirectional internal/external VCO pins 5 and 6 (EXT_VCO_INP and
EXT_VCO_INN, respectively). The divider chain and the internal
PLL can be locked by an external VCO.
Bits[20:16] provide the register address.
External LO
Bits[24:21] provide the device address (the SKY73208-11 is
0110b).
A timing diagram for the SPI write cycle is shown in Figure 3.
The SKY73208-11 can accept an external LO signal and disable
the internal synthesizer. The high impedance differential injection
Figure 3. SPI Write Cycles
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Table 2. SPI Timing Requirements
Timing
Description
Minimum Time
(ns)
tperiod
Clock period
25
thigh
Clock high time
10
tsu
Data setup to clock rise
5
thld
Data hold from clock rise
5
telch
Enable low to clock rise
10
twidth
Enable high width
10
tefeh
Clock fall to enable high
20
Figure 4. SPI Input Timing Diagram
Serial Bus Timing
The SPI bus speed is programmable. Timing requirements for the
CLK, DATA, and LE signals are provided in Table 2. A serial data
input timing diagram is shown in Figure 4.
PLL Control Registers (R-Divider and N-Divider)
There are three digital PLL control registers that are used to store
the R-divider and N-divider values: R_DIV, N_DIV1, and N_DIV2.
By default, all registers are 25 bits wide. Bits[20:16] are the
address bits of the registers. The 16 least significant bits (LSBs)
represent the data bits.
The VCO frequency (FVCO) has a range of 2.8 GHz to 6.0 GHz, and
is defined by the product of the desired frequency (FRF) and the
VCO divider, D:
FVCO = FRF × D
(1)
The VCO divider (equal to 1, 2, 4, or 8) is chosen so that the
product of FRF × D is within the specified VCO range.
The frequency step size (FSTEP) is a user-defined value. Given FSTEP
and D, the comparison frequency (FCOMP) can be calculated by:
FCOMP = FSTEP × D
Three values are needed to calculate the three PLL dividers: the
desired frequency (FRF), the VCO divider (D), and the frequency
step size (FSTEP).
(2)
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
The R_DIV register stores the value of the 11-bit R-divider that
produces the desired comparison frequency (FCOMP) for the RF PLL
according to the following equation:
R=
FREF
FCOMP
(3)
Where FREF is the reference frequency provided to the device.
The N_DIV1 and N_DIV2 registers store the value of the N-divider
according to the following equation:
N=
FVCO
×R
FREF
(4)
Bits[1:0] of the N_DIV2 register are the most significant bits
(MSBs) of the 18-bit representation of the N number.
Bits[15:0] of the N_DIV1 register are the LSBs of the 18-bit binary
representation of the N number.
The calculated R-divider and N-divider values are programmed
into the SKY73208-11 using the SPI interface.
Additional programming information is provided in the document,
Skyworks Wideband, Integer-N Phase-Locked Loop Programming
Guide, document number 201322.
Example:
A desired RF output frequency of 1800 MHz is required using a
reference frequency of 76.8 MHz and a desired frequency step
size of 400 kHz. If the VCO divider is equal to 2, the VCO
frequency is 3600 MHz from Equation 1 and the comparison
frequency is equal to 800 kHz from Equation 2.
From Equations 3 and 4, the R and N values become:
R = 96 = 1100000b
N = 4500 = 1000110010100b
These values would be programmed through the SPI interface.
Figure 5 represents the bits of the R_DIV register with the value of
R = 96. Figures 6 and 7 represent the bits of the N_DIV1 and
N_DIV2 registers, respectively, with the value of N = 4500.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY73208-11 are provided
in Table 3. The recommended operating conditions are specified
in Table 4 and electrical specifications are provided in Table 5.
Figure 5. R_DIV Register Showing an R-Divider Value of 96
Figure 6. N_DIV1 Register Showing an N-Divider Value of 4500 (LSBs)
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Figure 7. N_DIV2 Register Showing an N-Divider Value of 4500 (MSBs)
Table 3. SKY73208-11 Absolute Maximum Ratings
Maximum
Units
Mixer supply voltage (VDD_LO, VDD_IF,
VDD_MIXBIAS, and VDD_MIX = +5 V)
Parameter
VDD_MIX
Symbol
5.5
V
Synthesizer supply voltage (VDD_VCO,
VDD_OBUF, VDD_PLL, VDD_CLK, VDD_DIV,
VDD_CP, and VDD_DIG = +3.3 V)
VDD_SYNTH
3.6
V
Mixer supply current (VDD_LO, VDD_IF,
VDD_MIXBIAS, and VDD_MIX = +5 V)
IDD_MIX
200
mA
Synthesizer supply current (VDD_VCO,
VDD_OBUF, VDD_PLL, VDD_CLK, VDD_DIV,
VDD_CP, and VDD_DIG = +3.3 V)
IDD_SYNTH
150
mA
RF input power
PIN
Operating case temperature
TC
Junction temperature
TJ
Storage case temperature
TSTG
Minimum
–40
–40
Typical
+10
dBm
+85
°C
+150
°C
+125
°C
Notes: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Table 4. SKY73208-11 Recommended Operating Conditions
Parameter
Symbol
Minimum
Typical
Maximum
Units
Mixer supply voltage (VDD_LO, VDD_IF,
VDD_MIXBIAS, and VDD_MIX pins)
VDD_MIX
4.75
5.00
5.25
V
Synthesizer supply voltage (VDD_VCO,
VDD_OBUF, VDD_PLL, VDD_CLK, VDD_DIV,
VDD_CP, and VDD_DIG pins)
VDD_SYNTH
3.0
3.3
3.6
V
RF frequency range
fRF
350
5000
MHz
IF frequency range
fIF
50
500
MHz
Mixer supply current (VDD_LO, VDD_IF,
VDD_MIXBIAS, and VDD_MIX pins)
IDD_MIX
135
mA
Synthesizer supply current (VDD_VCO,
VDD_OBUF, VDD_PLL, VDD_CLK, VDD_DIV,
VDD_CP, and VDD_DIG pins)
IDD_SYNTH
120
mA
Operating case temperature
TC
SPI logic levels (CLK, DATA, LE):
Low
High
VIL
VIH
+85
°C
0.2 × VDD_3.3V
V
V
–40
0.8 × VDD_3.3V
External LO input level (Note 1)
500
mVp-p, diff.
Note 1: Input signal level that maintains the mixer performance described in Table 5.
Table 5. SKY73208-11 Electrical Specifications (1 of 2) (Note 1)
(VDD_MIX = +5 V, VDD_SYNTH = +3.3 V, TC = +25 °C, RF Frequency = 700 to 2700 MHz, IF Frequency = 100 MHz,
LO Frequency = 800 to 2800 MHz High-Side Injection or 600 to 2600 MHz Low-Side Injection, Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
6.0
5.5
4.5
6.5
6.0
5.0
Max
Units
Mixer
Conversion gain
dB
dB
dB
G
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
Noise Figure
NF
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
Third order input intercept point
IIP3
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
+21.5
+21.5
+20.0
+24.5
+25.5
+23.0
±1.2
dB
Third order output intercept point
OIP3
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
+27.0
+26.0
+24.0
+31.0
+31.5
+28.0
dBm
dBm
dBm
2RF – 2LO
2x2
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
–66.5
–73.5
–62.0
–50.0
–50.0
–50.0
dBc
dBc
dBc
3RF – 3LO
3x3
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
–79.0
–72.5
–72.5
–60.0
–60.0
–60.0
dBc
dBc
dBc
1 dB Input Compression Point
IP1dB
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
Gain variation over temperature
±0.5
14.5
14.0
15.5
IIP3 variation over temperature
+4.0
+4.0
+6.0
dB
15.5
15.5
16.0
dBm
dBm
dBm
+5.0
+5.5
+6.5
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dB
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dBm
dBm
dBm
DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Table 5. SKY73208-11 Electrical Specifications (2 of 2) (Note 1)
(VDD_MIX = +5 V, VDD_SYNTH = +3.3 V, TC = +25 °C, RF Frequency = 700 to 2700 MHz, IF Frequency = 100 MHz,
LO Frequency = 800 to 2800 MHz High-Side Injection or 600 to 2600 MHz Low-Side Injection, Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
+9.0
+9.0
+9.0
+10.5
+10.5
+10.5
Max
Units
Mixer (continued)
1 dB Output Compression Point
OP1dB
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
dBm
dBm
dBm
RF-to-IF isolation (Note 2)
fRF = 1980 MHz
–30
dBc
LO leakage @ RF port
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
–30
–30
–30
dBm
dBm
dBm
–19
–14
–13
–14
–12
–11
dB
dB
dB
10.0
153.6
200.0
0.2
1.5
1.2
4.8
RF port input return loss
ZIN_RF
No matching:
fRF = 915 MHz
fRF = 1980 MHz
fRF = 2700 MHz
Synthesizer
Reference input frequency
fREF
Reference input sensitivity
Charge pump current
ICP
LO output power
–6
Comparison spurs
Locking time
MHz
Vp-p
7.2
mA
–2
dBm
–65
dBc
1
ms
Phase noise @ 1015 MHz
@ 10 kHz offset
@ 100 kHz offset
@ 1 MHz offset
@ 10 MHz offset
–87
–100
–134
–148
–83
–94
–132
–145
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
Phase noise @ 2080 MHz
@ 10 kHz offset
@ 100 kHz offset
@ 1 MHz offset
@ 10 MHz offset
–86.0
–102.0
–134.0
–150.0
–81.5
–94.0
–131.0
–146.5
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
Phase noise @ 2800 MHz
@ 10 kHz offset
@ 100 kHz offset
@ 1 MHz offset
@ 10 MHz offset
–84.0
–99.5
–131.5
–148.0
–78.0
–90.0
–128.0
–146.0
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
RMS phase error @ 1015 MHz
1 kHz to 10 MHz
integrated bandwidth
0.75
1.10
deg
RMS phase error @ 2080 MHz
1 kHz to 10 MHz
integrated bandwidth
0.85
1.10
deg
RMS phase error @ 2800 MHz
1 kHz to 10 MHz
integrated bandwidth
1.0
1.2
deg
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Note 2: Under fully symmetric load conditions.
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Evaluation Board Description
Package Dimensions
The SKY73208-11 Evaluation Board is used to test the
performance of the SKY73208-11 module. An Evaluation Board
schematic diagram is provided in Figure 8. An assembly drawing
for the Evaluation Board is shown in Figure 9 and the layer detail
is provided in Figure 10.
The PCB layout footprint for the SKY73208-11 is provided in
Figure 11. Figure 12 shows the package dimensions for the
36-pin MCM, and Figure 13 provides the tape and reel
dimensions.
Circuit Design Configurations
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 as possible.
2. The ground pad of the SKY73208-11 has special electrical and
thermal grounding requirements. This pad is the main thermal
conduit for heat dissipation. Since the circuit board acts as the
heat sink, it must shunt as much heat as possible from the
device. Therefore, design the connection to the ground pad to
dissipate the maximum wattage produced by the circuit board.
3. Skyworks recommends including external bypass capacitors
on the VDD voltage inputs of the device.
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 SKY73208-11 is rated to Moisture Sensitivity Level 3 (MSL3)
at 260 °C. It can be used for lead or lead-free soldering. For
additional information, refer to the Skyworks Application Note,
PCB Design & 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.
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Figure 8. SKY73208-11 Evaluation Board Schematic
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Figure 9. SKY73208-11 Evaluation Board Assembly Drawing
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Figure 10. SKY73208-11 Evaluation Board Layer Detail
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Figure 11. SKY73208-11 PCB Layout Footprint
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DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Figure 12. SKY73208-11 36-Pin MCM Package Dimensions
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15
DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Figure 13. SKY73208-11 Tape and Reel Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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May 31, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201317E
DATA SHEET • SKY73208-11 MIXER WITH PLL AND VCO
Ordering Information
Model Name
SKY73208-11 350-5000 MHz Receive Mixer with PLL
and VCO
Manufacturing Part Number
SKY73208-11
Evaluation Board Part Number
TW18-D245-003
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201317E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 31, 2013
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