DATA SHEET
SKY85712-21: 5 GHz WLAN Front-End Module
Applications
PA_EN
802.11ac networking and personal computing systems
PC cards, PCMCIA cards, mini-cards, and half mini-cards
WLAN-enabled wireless video systems
Features
TX
Integrated high-performance 5 GHz PA, LNA with bypass, and
T/R switch
Fully-matched input and output
Integrated power detector and directional coupler
PA
VDET
ANT
RX
LNA
Transmit gain: 27 dB
LNA_EN
Output power: +19 dBm @ 1.8% EVM, HT80, MCS9, 5 V/4.2 V
Output power: +20 dBm @ 3% EVM, HT40, MCS7, 5 V/4.2 V
Small QFN (16-pin, 3 x 3 mm) package
(MSL3, 260 C per JEDEC J-STD-020)
LNA_EN
CRX
GND
ANT
15
14
13
2
11
VCC2
GND
3
10
VCC1
VDD
4
9
N/C
7
8
TX
RX
GND
GND
PA_EN
12
VDET
1
6
Description
The SKY85712-21 is a highly integrated, 5 GHz front-end module
(FEM) incorporating a 5 GHz single-pole, double-throw (SPDT)
transmit/receive (T/R) switch, a 5 GHz low-noise amplifier (LNA)
with bypass, and a 5 GHz power amplifier (PA) intended for
mobile/portable 802.11ac applications and systems.
The LNA and PA disable functions ensure low leakage current in
off mode. An integrated power detector is included to provide
closed-loop power control within the system.
GND
5
S2325a
Figure 1. SKY85712-21 Block Diagram
Skyworks GreenTM products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of GreenTM, document number
SQ04–0074.
16
CRX
Receive gain: 12 dB
The device is provided in a compact, 16-pin 3 x 3 mm Quad Flat
No-Lead (QFN) package. 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.
Y0007
Figure 2. SKY85712-21 Pinout
(Top View)
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DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Table 1. SKY85712-21 Signal Descriptions
Pin
Name
Description
Ground
Pin
9
Name
N/C
Description
1
GND
No connection
2
RX
RF receive output
10
VCC1
PA supply voltage
3
GND
Ground
11
VCC2
PA supply voltage
4
VDD
LNA supply voltage
12
GND
Ground
5
VDET
Detector output voltage
13
ANT
Antenna
6
PA_EN
PA enable
14
GND
Ground
7
GND
Ground
15
CRX
Switch control voltage
8
TX
RF transmit input
16
LNA_EN
LNA enable
Technical Description
Electrical and Mechanical Specifications
The SKY85712-21 is comprised of a high-performance 5 GHz
PA, 5 GHz LNA, and broadband SPDT switch. The device is fully
matched, and requires few external components for optimal
performance, which makes it ideal for small portable/mobile
applications. The FEM provides up to +27 dB of gain over the
frequency band. The LNA supports an enable/disable mode for
power savings when not in receive mode and a bypass function
for increased receive dynamic range. The PA can be shut off
using the PA_EN signal (pin 6).
The absolute maximum ratings of the SKY85712-21 are
provided in Table 2. The recommended operating conditions are
specified in Table 3, and electrical specifications are provided in
Table 4.
The state of the SKY85712-21 is determined by the logic
provided in Table 5.
The low-loss broadband switch provides the T/R switching
function on the SKY85712-21 and has a 1 dB output
compression point (OP1dB) of approximately +25 dBm.
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DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Table 2. SKY85712-21 Absolute Maximum Ratings1
Parameter
Symbol
Supply voltage
VCC1, VCC2
Supply voltage
VDD
DC input on control pins (PA_EN, LNA_EN, CRX)
VIN
Minimum
Maximum
Units
-0.3
+6.0
V
+6.0
V
-0.3
+3.6
V
Input power (50 Ω load)
PIN
+10
dBm
Supply current
ICC
400
mA
Storage temperature
TST
+150
C
Junction temperature
TJ
170
C
1000
V
-40
Electrostatic discharge:
Human Body Model (HBM), Class 1C
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.
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. SKY85712-21 Recommended Operating Conditions1
Parameter
Symbol
Min
Typ
Max
Units
Supply voltage
VCC1, VCC2, VDD
3.9
5.0
5.5
V
Control logic:
High
Low
VIH
VIL
2.5
0
3.6
0.4
V
V
Operating temperature
TOP
-40
+85
C
1 During production test, devices will be tested at 5 V.
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DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Table 4. SKY85712-21 Electrical Specifications1 (1 of 2) (VCC = VDD = 5 V, Unless Otherwise Specified, TOP = 25 °C,
Unless Otherwise Noted)
Parameter
Frequency range
Symbol
f
Test Condition
Main frequency band
Min
Typ
5.15
Max
Units
5.85
GHz
31
dB
+0.5
dB
Transmit Mode
Gain
G
Gain flatness
24
Over any 40 MHz bandwidth
27
-0.5
With -45 dB EVM source, VCC = 5.0 V:
MCS9, HT80, 1.8 % DEVM, AT off
MCS7, HT40, 3 % DEVM, AT off
MCS0, mask compliance
Output power
+17
+18
+21
+19
+20
+24
dBm
dBm
dBm
+19
+20
+24
dBm
dBm
dBm
POUT
With -45 dB EVM source, VCC = 4.2 V:
MCS9, HT80, 1.8 % DEVM, AT off
MCS7, HT40, 3 % DEVM, AT off
MCS0, mask compliance
Current consumption
ITOT
Modulated signal:
Idle current, VEN = 0
@ Quiescent
@ +19 dBm
@ +20 dBm
@ +22 dBm
2nd and 3rd harmonics
2fo, 3fo
+22 dBm MCS0
20
230
275
300
330
35
μA
mA
mA
mA
mA
-50
dBm/MHz
-25
dBm
All spurious
+22 dBm OFDM, 6 Mbps
-28
Isolation
From ANT to either TX or RX pin
40
dB
Input return loss
|S11|
7
10
dB
Output return loss
|S22|
10
12
dB
VCC1 = VCC2 = VDD = 5.0 V:
@ No RF
@ +19 dBm
@ +23 dBm
0.30
0.75
1.05
V
V
V
VCC1 = VCC2 = VDD = 4.2 V:
@ No RF
@ +19 dBm
@ +23 dBm
0.3
0.7
1.0
V
V
V
Power detector output:
Power detector output impedance
ZOUT_DET
PA enable current
IENABLE
Ruggedness
RU
RF output = -30 dBm
Maximum input power at which PA can
survive 10:1 mismatch with no permanent
damage.
700
Ω
0.5
mA
+10
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dBm
DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Table 4. SKY85712-21 Electrical Specifications1 (2 of 2) (VCC = VDD = 5 V Unless Otherwise Specified, TOP = 25 °C,
Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
9
12
16
Units
Receive Mode
Gain
G
1 dB Input compression point
IP1dB
LNA active
LNA bypass
Gain step
19
Gain flatness
Over any 40 MHz bandwidth
Noise figure
|S11|
Output return loss
|S22|
Third order input intercept point
IIP3
21
-0.25
NF
Input return loss
dB
-5
+10
2.7
LNA active
LNA bypass
dBm
dBm
23
dB
+0.25
dB
3.0
dB
6
10
5
dB
dB
8
dB
+8
dBm
LNA ↔ bypass
200
ns
RX ↔ TX：
From 10% ↔ 90% power change of
rising or falling edge, state 1
400
ns
15
mA
LNA enable current
10
μA
CRX enable current
10
μA
20
μA
Switching time
tSW
LNA bias current
IDD
Idle current
IIDLE
11
State 1
Receive Bypass Mode
Insertion loss
|S21|
-9
dB
1 Performance is guaranteed only under the conditions listed in this table.
Table 5. SKY85712-21 Logic
Mode
State
CRX (J5, Pin 15)
LNA_EN (J5, Pin 16)1
PA_EN (J5, Pin 6)2
All off (switch in TX mode)
1
0
0
0
WLAN receive
2
1
1
0
WLAN receive bypass mode
3
1
0
0
WLAN transmit
4
0
0
1
1 LNA is on while LNA_EN is high. LNA is off and in bypass mode when LNA_EN is low.
2 PA_EN controls only the PA. It does not control the switch.
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DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Evaluation Board Description
Circuit Design Considerations
The SKY85712-21 Evaluation Board is used to test the
performance of the SKY85712-21 FEM. A suggested application
schematic diagram is shown in Figure 3. A photograph of the
Evaluation Board is shown in Figure 4. Table 6 provides the Bill of
Materials (BOM) list for Evaluation Board components.
The following design considerations are general in nature and
must be followed regardless of final use or configuration:
Evaluation Board Setup Procedure
1. Connect system ground to pin 2 of the J4 header and to pin 2
of the J5 header.
2. Apply 5 V to pins 1 and 3 of the J4 header and to pin 3 of the
J5 header.
3. Select a path according to the information in Table 5:
L=0V
H = 3.3 V
4. Connect a DMM to pin 12 of the J5 header to monitor the
power detector voltage.
Paths to ground should be made as short as possible.
The ground pad of the SKY85712-21 has special electrical and
thermal grounding requirements. This pad is the main thermal
conduit for heat dissipation. Because 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.
NOTE: A poor connection between the ground pad and ground
increases junction temperature (TJ), which reduces the life
of the device.
Place component C7 close to pin 11.
Place component C6 close to pin 10.
The ANT port is DC-blocked and does not require a DC blocking
capacitor.
There is no DC present on the RX port. This pin needs to be
DC-blocked with a general purpose 4.7 pF capacitor if there is
> 2.6 V DC on the trace connecting to the RX port.
There is no DC present on the TX port. This pin needs to be
DC-blocked with a general purpose 4.7 pF capacitor if there is
> 3.2 V DC on the trace connecting to the TX port.
Each VCC pin needs to be individually decoupled as shown in
the Evaluation Board schematic. Place C7 close to pin 11.
Place C6 close to pin 10.
VCC1 and VCC2 should not be shorted together at the device
pins. Refer to the layout for details.
The DNI components and 0 Ω resistors can be eliminated.
The ANT and LNA OUT trace losses are 0.18 dB. The TX IN
trace losses are 0.22 dB.
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DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
VDD
VDD
J5
J5
J5
J4
1
2
3
LEN
4
5
6
7
8
9
CRX
10
11
12
VCC2
VCC1
×
PEN
VDET
1
2
3
4
5
6
7
8
J3
RF Output
VDD
5
1
RX
GND
2
GND
3
VDD
4
VDET
VDET
LNA_EN
6
PEN
PA_EN
CRX
GND
GND
TX
ANT
15
CRX
L1
1.3 nH
13
10
11
GND
N/C
9
VCC2
8
VCC1
J1
LEN
14
7
RF Input
16
C19
0.3 pF
J2
Antenna
C20
0.3 pF
12
×
VCC1
VCC2
R6
33 Ω
(see BOM for details)
Note:
C6
0.22 μF
C7
47000 pF
0 Ω resistors and DNI components are not shown in schematic.
Y1576
Figure 3. SKY85712-21 Application Schematic
Figure 4. SKY85712-21 Evaluation Board
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Table 6. SKY85712-21 Evaluation Board Bill of Materials1
Component
Value
Size
Vendor
Mfr Part Number
Description
C6
0.22 μF
0402
Murata
GRM155R60J224KE01
Multilayer ceramic
C7
47000 pF
0402
Murata
GRM155R71E473KA88
Multilayer ceramic
R6
33 Ω when VCC = 5 V
0 Ω when VCC = ≤ 4.2 V
0402
Panasonic
ERJ2GEJ330
Thick film chip resistor
C19, C20
0.3 pF
0402
Murata
GJM1555C1HR30BB01
Multilayer ceramic
L1
1.3 nH
0402
Murata
LQG15HN1N3S02D
High-frequency multilayer
1 0 Ω resistors and DNI components are not shown in the Bill of Materials.
Package Dimensions
Package and Handling Information
The PCB layout footprint for the SKY85712-21 is shown in
Figure 5. Typical part markings are shown in Figure 6. Package
dimensions are shown in Figure 7, and tape and reel
dimensions are provided in Figure 8.
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 SKY85712-21 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, Solder Reflow Information, document number 200164.
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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1.95
16
15
14
13
1
3X 0
3X 0.60
3.40
14
3X 0.60
DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
1
12
12
3X 0.60
3.40
2
11
3
10
4
9
3X 0
1.95
0
3
3X 0.60
0.53 Typ.
6
7
0.500 Typ.
8
0
5
0.250 Typ.
Board Metal
Via Pattern
(Note 1)
3.50
3.40
0.73 Typ.
1.85
16
15
9X ∅0.254
7
14
1
0.20 Typ.
Component
Outline
13
12
16
15
14
13
1
12
0.73 Typ.
2
11
2
11
3
10
3
10
4
9
4
9
3.50 1.85
3.40
0.20 Typ.
0.63 Typ.
5
6
0.500 Typ.
7
0.53 Typ.
5
8
0.350 Typ.
6
7
0.500 Typ.
Solder Mask Pattern
(Note 2)
8
0.250 Typ.
Stencil Pattern
(Note 3)
61% solder coverage
on center pad
Notes:
1. Via hole recommendations:
0.025 mm Cu via wall plating (minimum), solder mask on the far side should tent or plug via holes.
2. Solder mask recommendations:
Contact board fabricator for recommended solder mask offset and tolerance.
3. Stencil recommendations:
0.125 mm stencil thickness, laser cut apertures, trapezoidal walls and rounded corners offer better paste release.
4. Dimensions and tolerances according to ASME Y14.5M-1994.
5. Unless specified, dimensions are symmetrical about center lines.
6. All dimensions are in millimeters.
S3179
Figure 5. SKY85712-21 PCB Layout Footprint
(Top View)
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DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Pin 1
Indicator
Skyworks
Part Number
Y0266
Lot Code
Figure 6. Typical Part Markings
(Top View)
3.00 ± 0.05
A
0.55 ± 0.05
0.05 C
1.955 ± 0.05
0.152 Ref
B
0.02 + 0.03
–0.02
R 0.20
Pin 1 Indicator
Pin 1
Indicator
Exposed Pad
3.00 ± 0.05
1.955 ± 0.05
3X R0.10
16X 0.20 Min
0.05 C
2X
16X
0.05 C
C
Top View
Seating Plane
2X
0.05 C
0.50
Detail A
4
NOTES:
1. All measurements are in millimeters.
2. Dimensioning and tolerancing according to ASME Y14.5M-1994.
3. Unless otherwise specified, the following values apply:
Decimal Tolerance:
Angular Tolerance:
X.X (1 place) ± 0.1 mm
± 0.5°
X.XX (2 places) ± 0.05 mm
X.XXX (3 places) ± 0.025 mm
4. Coplanarity applies to the terminals as well as other bottom surface metallization.
5. Dimension applies to metallized terminal. If terminal tip has a radius,
dimension should not be measured in that radius area.
6. Unless specified, dimensions are symmetrical about center lines.
Bottom View
Detail A
0.27 ± 0.05
0.25 ± 0.05
5
Scale: 2X
16 Places
0.10 M C A B
0.05 M C
Figure 7. SKY85712-21 Package Dimensions
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Y0267
DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
0.80 ± 0.1 (Ko)
3.30 ± 0.1 (Bo)
Re f
3° .
CL
B
Po
4.00 ± 0.1 (Note 2)
E1
1.75 ± 0.1
Pin 1 Location
∅1.5 Min. (D1)
A
B
8.00 ± 0.1 (P1)
12.00 ± 0.3
0.30 ± 0.05 (T)
P2
2.00 ± 0.1 (Note 1)
5.50 ± 0.1 (Note 1)
∅1.55 ± 0.05 (Do)
3.30 ± 0.1 (Ao)
Section B
Ref.
R0.6
Notes:
1.
2.
3.
4.
Measured from center line of sprocket hole to center line of pocket.
Cumulative tolerance of 10 sprocket holes is ± 0.20 mm.
Other material available.
Typical ESD surface resistivity is from 105 to 1011 Ohms/square per EIA, JEDEC
tape and reel specification.
5. All measurements are in millimeters.
f.
Re .50
R0
f.
Re .35
R0
Detail A
S2615
Figure 8. SKY85712-21 Tape and Reel Dimensions
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DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Ordering Information
Model Name
SKY85712-21: 5 GHz WLAN Front-End Module
Manufacturing Part Number
SKY85712-21
Evaluation Board Part Number
SKY85712-21EK1
Copyright © 2013-2015, 2017 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by
Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the
information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to
update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or
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THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A
PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY
DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS
SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION,
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Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury,
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damages resulting from such improper use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of
products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for
applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks and the Skyworks symbol are trademarks or registered trademarks of Skyworks Solutions, Inc. or its subsidiaries in the United States and other countries. Third-party brands and names
are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are
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