DATA SHEET
SKY85402-11: High-Power (+22 dBm) 802.11ac WLAN Power
Amplifier with Integrated Power Detector
Applications
IEEE 802.11ac WLAN enabled:
Access points
Media gateways
Set-top boxes
LCD TVs
Other broadband triple-play multimedia applications
PA_EN
Bias
Input
Match
Input
Match
RF_IN
Inter-Stage
Match
Inter-Stage
Match
Detector
RF_OUT
202120-001
VCC1
VCC2
VDET
VCC3
Figure 1. SKY85402-11 Block Diagram
Features
Linear output power for IEEE 802.11ac 256-QAM,
EVM < 1.8% = +22 dBm @ 5.0 V
High gain: 32 dB
Power shutdown mode
Superior gain flatness
Fully matched at RF input/output ports
Load insensitive power detector
Small footprint QFN (20-pin, 4 x 4 mm) SMT package
(MSL3, 260
C
per JEDEC J-STD-020)
Description
Skyworks SKY85402-11 is a 5
GHz
Microwave Monolithic
Integrated Circuit (MMIC) power amplifier (PA) with superior
output power, linearity, and efficiency. These features make the
SKY85402-11 ideal for wireless local area network (WLAN IEEE
802.11ac) applications.
The device is fabricated using SiGe BiCMOS technology. The
device is internally matched and mounted in a 20-pin, 4 x 4 mm
Quad Flat No-Lead (QFN) surface-mount technology (SMT)
package, which allows for a highly manufacturable low cost
solution.
A block diagram of the SKY85402-11 is shown in Figure 1. The
device package and pinout are shown in Figure 2. Signal pin
assignments and functional pin descriptions are described in
Table 1.
Skyworks
Green
TM
products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to
Skyworks
Definition of Green
TM
, document number
SQ04–0074.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202120L • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 21, 2018
1
DATA SHEET • SKY85402-11: HIGH-POWER (+22 dBm) 802.11ac WLAN PA
VCC1
VCC2
VCC3
18
GND
17
20
19
N/U
GND
RF_IN
GND
PA_EN
GND
16
1
2
3
4
5
6
7
8
9
10
15
14
13
12
11
GND
GND
RF_OUT
GND
GND
VCC3
N/U
N/U
N/U
Figure 2. SKY85402-11 Pinout
(Top View)
Table 1. SKY85402-11 Signal Descriptions
Pin
1
2
3
4
5
6
7
8
9
10
N/U
GND
RF_IN
GND
PA_EN
N/U
N/U
N/U
VCC3
VDET
Name
Description
Not used; open circuit
Ground
RF input
Ground
PA enable
Not used; open circuit
Not used; open circuit
Not used; open circuit
Third stage supply voltage
Analog power detector output
Pin
11
12
13
14
15
16
17
18
19
20
GND
GND
RF_OUT
GND
GND
GND
GND
VCC3
VCC2
VCC1
Name
Ground
Ground
Power amplifier RF output
Ground
Ground
Ground
Ground
Third stage supply voltage
Second stage supply voltage
First stage supply voltage
Description
Technical Description
The SKY85402-11 PA contains all of the needed RF matching and
DC biasing circuits. The device also provides an output power
detector voltage.
The SKY85402-11 is a three-stage, SiGe BiCMOS device
optimized for high linearity and power efficiency. These features
make the device suitable for wideband digital applications, where
PA linearity and power consumption are of critical importance (for
example, WiFi systems or WLANs).
The device has been characterized with the highest specified data
rates for IEEE802.11ac (256 QAM). Under these stringent test
conditions, the device exhibits excellent spectral purity and power
efficiency.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY85402-11 are provided
in Table 2. Recommended operating conditions are specified in
Table 3. Electrical specifications are provided in Tables 4, 5,
and 6.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2
August 21, 2018 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202120L
VDET
202120-002
DATA SHEET • SKY85402-11: HIGH POWER (+22 dBm) 802.11ac WLAN PA
Table 2. SKY85402-11 Absolute Maximum Ratings
1
Parameter
Supply voltage
Enable voltage
RF input power
Operating temperature
Storage temperature
Junction temperature
Thermal resistance
Electrostatic discharge:
Human Body Model (HBM), Class 1C
1000
V
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. Exceeding any of the limits listed here may result in permanent damage to the device.
Symbol
VCC1, VCC2, VCC3
PA_EN
P
IN
T
OP
T
ST
T
J
Θ
JC
Minimum
-0.3
-0.3
Maximum
+5.5
+3.6
+12
Units
V
V
dBm
C
C
C
C/W
-40
-40
+85
+150
+160
14.9
ESD HANDLING:
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 when handling or transporting. Static charges may easily produce
potentials of several kilovolts on the human body or equipment, which can discharge without detection.
Industry-standard ESD handling precautions should be used at all times.
Table 3. SKY85402-11 Recommended Operating Conditions
Parameter
Supply voltage
Enable voltage
Case operating temperature
Symbol
VCC1, VCC2, VCC3
PA_EN
T
OP
Min
3.0
1.8
-40
+25
Typ
5.00
Max
5.25
3.6
+85
Units
V
V
C
Table 4. SKY85402-11 Electrical Specifications: DC Characteristics
1
(VCC1 = VCC2 = VCC3 = 5.0 V, PA_EN = 3.3 V, T
OP
= +25
C
as Measured on the Evaluation Board, Unless Otherwise Noted)
Parameter
Symbol
802.11ac:
Supply current
I
CC
P
OUT
= +22 dBm, MCS9, 5 V
P
OUT
= +25 dBm, MCS7, 5 V
PA_EN = 0 V, No RF
Quiescent current
Enable voltage:
High
Low
Enable current
I
CQ
PAEN_
H
PAEN_
L
I
EN
No RF
1.8
0
150
450
560
20
335
3.6
0.5
200
495
615
100
mA
mA
μA
mA
V
V
μA
Test Condition
Min
Typ
Max
Units
1 Performance is guaranteed only under the conditions listed in this table.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202120L • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 21, 2018
3
DATA SHEET • SKY85402-11: HIGH-POWER (+22 dBm) 802.11ac WLAN PA
Table 5. SKY85402-11 Electrical Specifications: General
1
(VCC1 = VCC2 = VCC3 = 5.0 V, PA_EN = 3.3 V, T
OP
= +25
C,
Unless Otherwise Noted)
Parameter
Frequency range
Output power
f
P
OUT
802.11ac, MCS9, -35 dB DEVM, HT80, 5 V
802.11n, MCS7, -30 dB DEVM, HT40, 5 V
MCS0, 5 V, HT20, mask compliant
1 dB output compression point
Small signal gain
Input return loss
Gain
variation over band
2
nd
and 3
rd
harmonics
Rise and fall time
Stability
Ruggedness
Ru
OP1dB
|S
21
|
|S
11
|
S
21
2fo, 3fo
t
R
, t
F
P
OUT
= +28 dBm, VSWR = 6:1, all phases
P
IN
= +10 dBm, VSWR = 6:1, all phases
P
OUT
= +23 dBm
P
IN
= CW
Symbol
Test Condition
Min
5.15
+20.5
+23
+26
+28
30
8
+22
+25
+27.5
+29
32
14
±1.5
-50
0.5
All non-harmonically related outputs
< -50 dBm/MHz
No damage
-45
36
Typ
Max
5.85
Units
GHz
dBm
dBm
dBm
dBm
dB
dB
dB
dBm/MHz
μs
-
-
1 Performance is guaranteed only under the conditions listed in this table.
Table 6. SKY85402-11 Electrical Specifications: Power Detector Characteristics
1
(VCC = 5.0 V, PA_EN = 3.3 V, T
OP
= +25
C,
f = 5.4 GHz, Unless Otherwise Noted)
Parameter
Output power detector range
Symbol
PDR
P
OUT
= +28 dBm
Detector voltage
VDET
P
OUT
= +25 dBm
P
OUT
= No RF
ΔP
OUT
@ constant VDET, +25 dBm:
Detector accuracy
ERR
DET
5.15
GHz
to 5.32
GHz.
0.65 V
5.32
GHz
to 5.70
GHz,
0.66 V
5.70
GHz
to 5.85
GHz,
0.88 V
Detection variation at VSWR = 3:1
-0.5
-0.5
-0.5
±1.5
2
26.5
+0.5
+0.5
+0.5
dB
dB
dB
dB
kΩ
kΩ
Test Condition
Min
0
0.85
0.65
0.30
Typ
Max
OP1dB
Units
dBm
V
V
V
Output impedance
DC load impedance
PDZ
OUT
PDZ
LOAD
1 Performance is guaranteed only under the conditions listed in this table.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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August 21, 2018 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202120L
DATA SHEET • SKY85402-11: HIGH POWER (+22 dBm) 802.11ac WLAN PA
Evaluation Board Description
The SKY85402-11 Evaluation Board is used to test the
performance of the SKY85402-11 WLAN PA. A schematic diagram
of the SKY85402-11 Evaluation Board is shown in Figure 3. A
photograph of the Evaluation Board is shown in Figure 4.
Component values for the SKY85402-11 Evaluation Board are
listed in Table 7.
Evaluation Board Setup Procedure
1. Connect system ground to pin 2 of connector J6.
2. Apply 5.0 V to pin 7 of connector J6.
3. By applying 3.3 V on PA_EN (pin 6 of the J5 header), the PA is
enabled. By placing a ground on PA_EN, the PA is disabled and
placed in a shutdown state, drawing minimal current.
4. The 5
GHz
amplifier performance can be monitored by applying
an RF signal to connector J2 (RF_IN). Monitor the output power
on the RF_OUT port connector, J1.
5. Detector performance can be monitored on pin 4 of connector
J5.
CAUTION:
Do not overdrive the amplifier by applying too much
RF on the device input. A suitable starting input power
setting is -20 dBm.
Circuit Design Considerations
The following design considerations are general in nature and
must be followed regardless of final use or configuration:
Paths to ground should be made as short as possible.
The ground pad of the SKY85402-11 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. Multiple
vias to the grounding layer are required. For further information,
refer to the Skyworks Application Note
PCB Design Guidelines
for High Power Dissipation Packages,
document number
201211.
Bypass capacitors should be used on the DC supply lines. Refer
to the schematic drawing in Figure 10 for further details.
The RF lines should be well separated from each other with
solid ground in between traces to maximize input-to-output
isolation.
The RF_IN and RF_OUT ports are DC short to ground. These
ports need to be DC blocked with general purpose 10 pF
capacitors if there is DC present on the traces connecting to the
ports.
The RF_IN and RF_OUT trace losses measured from device pin
to SMA connector are 0.2 dB each.
NOTE:
A poor connection between the ground pad and ground
increases junction temperature (T
J
), which reduces the life
of the device.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202120L • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 21, 2018
5
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