DATA SHEET
SKY85712-21: 5 GHz WLAN Front-End Module
802.11ac networking and personal computing systems
PC cards, PCMCIA cards, mini-cards, and half mini-cards
WLAN-enabled wireless video systems
TX
VDET
RX
LNA
PA
PA_EN
Applications
Features
Integrated high-performance 5 GHz PA, LNA with bypass, and
T/R switch
Fully-matched input and output
Integrated power detector and directional coupler
Transmit gain: 27 dB
Receive gain: 12 dB
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)
ANT
Figure 1. SKY85712-21 Block Diagram
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.
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.
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.
LNA_EN
GND
CRX
16
15
14
ANT
13
12
GND
RX
GND
VDD
1
GND
VCC2
VCC1
N/C
2
11
3
10
4
5
6
7
8
9
PA_EN
VDET
GND
TX
Y0007
Figure 2. SKY85712-21 Pinout
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202994I • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • December 3, 2015
1
LNA_EN
CRX
S2325a
DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Table 1. SKY85712-21 Signal Descriptions
Pin
1
2
3
4
5
6
7
8
GND
RX
GND
VDD
VDET
PA_EN
GND
TX
Name
Ground
RF receive output
Ground
LNA supply voltage
Detector output voltage
PA enable
Ground
RF transmit input
Description
Pin
9
10
11
12
13
14
15
16
N/C
VCC1
VCC2
GND
ANT
GND
CRX
LNA_EN
Name
No connection
PA supply voltage
PA supply voltage
Ground
Antenna
Ground
Switch control voltage
LNA enable
Description
Technical Description
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 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.
Electrical and Mechanical Specifications
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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December 3, 2015 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 202994I
DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Table 2. SKY85712-21 Absolute Maximum Ratings (Note 1)
Parameter
Supply voltage
Supply voltage
DC input on control pins (PA_EN, LNA_EN, CRX)
Input power (50
Ω
load)
Supply current
Storage temperature
Junction temperature
Electrostatic discharge:
Human Body Model (HBM), Class 1C
1000
V
Symbol
V
CC1
, V
CC2
V
DD
V
IN
P
IN
I
CC
T
ST
T
J
–40
–0.3
Minimum
–0.3
Maximum
+6.0
+6.0
+3.6
+10
400
+150
170
Units
V
V
V
dBm
mA
C
C
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. 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.
Table 3. SKY85712-21 Recommended Operating Conditions (Note 1)
Parameter
Supply voltage
Control logic:
High
Low
Operating temperature
Symbol
V
CC1
, V
CC2
, V
DD
V
IH
V
IL
T
OP
Minimum
3.9
2.5
0
–40
Typical
5.0
Maximum
5.5
3.6
0.4
+85
Units
V
V
V
C
Note 1:
During production test, devices will be tested at 5 V.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202994I • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • December 3, 2015
3
DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Table 4. SKY85712-21 Electrical Specifications (1 of 2) (V
CC
= V
DD
= 5 V, Unless Otherwise Specified, T
OP
= 25 °C,
Unless Otherwise Noted) (Note 1)
Parameter
Frequency range
Transmit Mode
Gain
Gain flatness
Output power
P
OUT
G
Over any 40 MHz bandwidth
With –45 dB EVM source, V
CC
= 5.0 V:
MCS9, HT80, 1.8 % DEVM, AT off
MCS7, HT40, 3 % DEVM, AT off
MCS0, mask compliance
With –45 dB EVM source, V
CC
= 4.2 V:
MCS9, HT80, 1.8 % DEVM, AT off
MCS7, HT40, 3 % DEVM, AT off
MCS0, mask compliance
Current consumption
I
TOT
Modulated signal:
Idle current, VEN = 0
@ Quiescent
@ +19 dBm
@ +20 dBm
@ +22 dBm
+22 dBm MCS0
+22 dBm OFDM, 6 Mbps
From ANT to either TX or RX pin
|S
11
|
|S
22
|
7
10
–28
40
10
12
+19
+20
+24
20
230
275
300
330
35
dBm
dBm
dBm
μA
mA
mA
mA
mA
dBm/MHz
dBm
dB
dB
dB
+17
+18
+21
+19
+20
+24
dBm
dBm
dBm
24
–0.5
27
31
+0.5
dB
dB
f
Symbol
Test Condition
Main frequency band
Min
5.15
Typical
Max
5.85
Units
GHz
2
nd
and 3
rd
harmonics
All spurious
Isolation
Input return loss
Output return loss
Power detector output:
V
CC
1
= V
CC
2
= V
DD
= 5.0 V:
@ No RF
@ +19 dBm
@ +23 dBm
V
CC
1
= V
CC
2
= V
DD
= 4.2 V:
@ No RF
@ +19 dBm
@ +23 dBm
Power detector output impedance
PA enable current
Ruggedness
2fo, 3fo
–50
–25
0.30
0.75
1.05
0.3
0.7
1.0
Z
OUT
_
DET
I
ENABLE
RU
Maximum input power at which PA can
survive 10:1 mismatch with no permanent
damage.
RF output = –30 dBm
700
0.5
V
V
V
V
V
V
Ω
mA
+10
dBm
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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December 3, 2015 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 202994I
DATA SHEET • SKY85712-21: 5 GHz WLAN FRONT-END MODULE
Table 4. SKY85712-21 Electrical Specifications (2 of 2) (V
CC
= V
DD
= 5 V Unless Otherwise Specified, T
OP
= 25 °C,
Unless Otherwise Noted) (Note 1)
Parameter
Receive Mode
Gain
1 dB Input compression point
Gain step
Gain flatness
Noise figure
Input return loss
Output return loss
Third order input intercept point
Switching time
NF
|S
11
|
|S
22
|
IIP3
t
SW
LNA
↔
bypass
RX
↔
TX：
From 10%
↔
90% power change of
rising or falling edge, state 1
LNA bias current
LNA enable current
CRX enable current
Idle current
Receive Bypass Mode
Insertion loss
|S21|
–9
dB
I
IDLE
State 1
I
DD
11
LNA active
LNA bypass
6
10
5
8
+8
200
Over any 40 MHz bandwidth
G
IP1dB
LNA active
LNA bypass
19
–0.25
2.7
9
12
–5
+10
21
23
+0.25
3.0
16
dB
dBm
dBm
dB
dB
dB
dB
dB
dB
dBm
ns
Symbol
Test Condition
Min
Typical
Max
Units
400
15
10
10
20
ns
mA
μA
μA
μA
Note 1:
Performance is guaranteed only under the conditions listed in this table.
Table 5. SKY85712-21 Logic
Mode
All off (switch in TX mode)
WLAN receive
WLAN receive bypass mode
WLAN transmit
Note 2:
PA_EN controls only the PA. It does not control the switch.
State
1
2
3
4
CRX (J5, Pin 15)
0
1
1
0
LNA_EN (J5, Pin 16)
(Note 1)
0
1
0
0
PA_EN (J5, Pin 6)
(Note 2)
0
0
0
1
Note 1:
LNA is on while LNA_EN is high. LNA is off and in bypass mode when LNA_EN is low.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202994I • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • December 3, 2015
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