DATA SHEET
SKY65388-11: 695 to 866 MHz Variable Gain Amplifier
Applications
WCDMA base stations
Femto cells
Description
The SKY65388-11 is a high linearity, Variable Gain Amplifier (VGA)
module. The device includes an input amplifier driver, a Variable
Voltage Attenuator (VVA), and an output Power Amplifier (PA). The
two amplifiers and voltage attenuator are optimized for superior
ACLR performance with WCDMA signals.
The high linearity (high OP1dB, OIP3, and ACLR) and high
efficiency of this device make it ideal for use at the final stage (or
close to the final stage) of a WCDMA transmit chain.
The output of the first PA (PA1) is matched to the input of the VVA.
The output of the VVA is matched to the input of the second PA
(PA2). The RF_IN and RF_OUT signals (pins 1 and 8, respectively)
are both internally matched, including DC blocking capacitors.
The SKY65388-11 VGA uses low-cost Surface Mount Technology
(SMT) in the form of a compact, 8 x 8 mm 12-pin Multi-Chip
Module (MCM), which allows for a highly manufacturable low-cost
solution. 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.
Features
Frequency range: 695 to 866 MHz
High gain: >25 dB
Attenuation range: > 30 dB
OP1dB: >+26 dBm
ACLR < –68 dBc for P
OUT
= +8 dBm
Single DC supply: +5 V
Small MCM (12-pin, 8.385 x 8.385 mm) SMT package (MSL3,
260
C
per JEDEC J-STD-020)
Skyworks
Pb-free products are compliant with
all applicable legislation. For additional
information, refer to
Skyworks Definition of
Lead (Pb)-Free,
document number
SQ04-0073.
VCTRL
RF_IN
Input Match
PA1
Variable Attenuator
PA2
Output Match
RF_OUT
S2326
Figure 1. SKY65388-11 Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202691C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 6, 2014
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DATA SHEET • SKY65388-11: VARIABLE GAIN AMPLIFIER
VCC_AMP1
11
12
10
RF_IN
GND
1
VCC_AMP2
GND
9
GND
RF_OUT
2
8
VCTRL
3
7
GND
4
5
6
GND
GND
GND
S2328
Figure 2. SKY65388-11 Pinout – 12-Pin MCM
(Top View)
Table 1. SKY65388-11 Signal Descriptions
Pin
1
2
3
4
5
6
RF_IN
GND
VCTRL
GND
GND
GND
Name
RF input
Ground
Variable attenuator control voltage
Ground
Ground
Ground
Description
Pin
7
8
9
10
11
12
GND
RF_OUT
GND
VCC_AMP2
VCC_AMP1
GND
Name
Ground
RF output
Ground
Voltage supply for PA2 (after the variable
voltage attenuator)
Voltage supply for PA1 (before the variable
voltage attenuator)
Ground
Description
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY65388-11 are provided
in Table 2. The recommended operating conditions are specified
in Table 3 and electrical specifications are provided in Table 4.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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February 6, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202691C
DATA SHEET • SKY65388-11: VARIABLE GAIN AMPLIFIER
Table 2. SKY65388-11 Absolute Maximum Ratings (Note 1)
Parameter
Supply voltage
Control voltage
RF output power (CW)
Operating case temperature
Storage case temperature
Junction temperature
Thermal resistance
Symbol
VCC_AMP1,
VCC_AMP2
V
CTL
P
OUT
T
C
T
STG
T
J
θ
JC
–40
–55
Minimum
Maximum
5.5
5.0
+26
+85
+125
+150
27
Units
V
V
dBm
C
C
C
C/W
Note 1:
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.
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.
Table 3. SKY65388-11 Recommended Operating Conditions
Parameter
Frequency range
RF output power (CW)
Supply voltage, measured at terminals of
Evaluation Board
Variable voltage attenuator control range
Ruggedness, load VSWR with no permanent
damage
Operating case temperature
f
P
OUT
VCC_AMP1,
VCC_AMP2
VCTRL
P
MAX
_
LOAD
T
C
–40
4.75
0
5.00
Symbol
Minimum
695.5
Typical
Maximum
865.5
+8
5.25
3.3
8:1
+85
Units
MHz
dBm
V
V
–
C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202691C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 6, 2014
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DATA SHEET • SKY65388-11: VARIABLE GAIN AMPLIFIER
Table 4. SKY65388-11 Electrical Specifications (Note 1)
(VCC_AMP1 = VCC_AMP2 = 5 V, VCTRL = 0 V, f = 780.5 MHz, T
C
= +25
C,
Characteristic Impedance [Z
O
] = 50
Ω,
Unless Otherwise Noted)
Parameter
Frequency range
Small signal gain
Main band gain flatness
Extended band gain flatness
Attenuation control range
Output 1dB Compression Point
3
rd
Order Output Intercept Point
Adjacent Channel Leakage Ratio
Noise Figure
Input return loss
Output return loss
Quiescent current
Maximum VSWR for stable operation
Operating current
ATTN
_
RANGE
OP1dB
OIP3
ACLR
NF
|S
11
|
|S
22
|
I
Q
VSWR
_
MAX
I
OP
f
|S
21
|
CW
758 to 803 MHz
695.5 to 865.5 MHz
CW, VCTRL = 0 ~ 3.3 V
CW
P
TONE
= +8 dBm,
Δf
= 1 MHz
WCDMA, test mode 1,
P
OUT
= +8 dBm
At maximum gain
Measured at 695 MHz and
865.5 MHz
Measured at 695 MHz and
865.5 MHz
No RF
CW
P
OUT
= +12 dBm, CW
8:1
290
330
10
10
28
+24.5
+40
Symbol
Test Condition
Min
695.5
26
29
0.32
1.15
34
+26
+43
–70
4.5
15
15
285
330
–68.0
6.0
0.50
1.50
Typical
Max
865.5
Units
MHz
dB
dB
dB
dB
dBm
dBm
dBc
dB
dB
dB
mA
–
mA
Note 1:
Performance is guaranteed only under the conditions listed in this Table.
Evaluation Board Description
The Skyworks SKY65388-11 Evaluation Board is used to test the
performance of the SKY65388-11 VGA. An Evaluation Board
schematic diagram is provided in Figure 3. An assembly drawing
for the Evaluation Board is shown in Figure 4 and the layer detail
is provided in Figure 5. The layer detail physical characteristics
are noted in Figure 6.
Capacitors C1, C2, and C3 provide DC bias decoupling and RF
bypass for VCC_AMP1 (pin 11). Capacitors C4, C5, and C6 provide
DC bias decoupling and RF bypass for VCC_AMP2 (pin 10).
Capacitor C7 provides decoupling for VCTRL (pin 3).
Pins 1 and 8 are the RF input and output signals, respectively.
Pins 2, 4, 5, 6, 7, 9, 12, and the package backside metal are
ground pins that provide the DC, RF, and thermal ground.
Circuit Design Configurations
The following design considerations are general in nature and
must be followed regardless of final use or configuration.
Proper isolation must be provided between the VCC_AMP1 and
VCC_AMP2 pins.
Paths to ground should be made as short as possible.
The ground pad of the SKY65388-11 VGA 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 amplifier. As such, design the connection to the ground pad
to dissipate the maximum wattage produced to the circuit
board. Multiple vias to the grounding layer are required. Filled or
capped vias are recommended.
It is recommended that the layout for the VCC_AMP1 and
VCC_AMP2 signals follow what is shown in Figure 4. The
VCC_AMP1 and VCC_AMP2 traces can be tied together to share
the same power supply. The connecting node should not be
placed close to the package pins. The connecting node should
be connected closer to components C1 and C4 (see Figure 3).
This is to provide isolation between VCC_AMP1 and VCC_AMP2.
NOTE: Junction temperature (Tj) of the device increases with a
poor connection to the ground pad and ground. This
reduces the life of the device.
Testing Procedure
Use the following procedure to set up the SKY65388-11
Evaluation Board for testing:
1. Connect a 5.0 V supply to the VCC_AMP1 and VCC_AMP2
pins. Connect the VCTRL signal to a power supply and set the
power supply to 0 V. If available, enable the current limiting
function of the power supply to 450 mA.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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February 6, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202691C
DATA SHEET • SKY65388-11: VARIABLE GAIN AMPLIFIER
2. Connect a signal generator to the RF signal input port. Set it to
the desired RF frequency at a power level of –20 dBm or less
to the Evaluation Board but do NOT enable the RF signal.
3. Connect a spectrum analyzer to the RF signal output port.
4. Enable the power supply.
5. Enable the RF signal.
6. Take measurements.
CAUTION:
If any of the output signals exceed the rated
maximum values, the SKY65388-11 Evaluation Board
can be permanently damaged.
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
THE SKY65388-11 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.
Package Dimensions
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
The PDB footprint drawing for the SKY65388-11 is shown in
Figure 7. Package dimensions for the 12-pin MCM are shown in
Figure 8, and tape and reel dimensions are provided in Figure 9.
J3
4
3
2
1
C3
22 pF
C2
1000 pF
C1
10
μF
PA1 Voltage
Supply
PA2 Voltage
Supply
VCTRL VDD
VCC
12
11
10
4-Header
J1
C6
22 pF
C5
1000 pF
C4
10
μF
VCC_AMP1
VCC_AMP2
GND
1
9
RF Input
2
RF_IN
GND
GND
J2
8
RF_OUT
7
RF Output
Variable Attenuator
Control
Voltage
3
C7
1000 pF
VCTRL
GND
GND
GND
5
6
4
GND
S2329
Figure 3. SKY65388-11 Evaluation Board Schematic
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202691C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 6, 2014
5
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