DATA SHEET
SKY85203-11: 2.4 GHz, 802.11ac Switch/Low-Noise
Amplifier Front-End
Applications
WiFi-enabled handsets, tablets, and mobile systems
System-in-Package (SiP) modules for embedded systems
802.11n/ac smartphones and tablets
VDD
BT
Features
Integrates an SP3T switch and LNA with bypass mode
Receive gain: 14.5 dB
Noise figure: 1.9 dB
Transmit/Bluetooth
®
path loss: 0.7 dB
Small QFN (12-pin, 2 x 2 mm) package
(MSL1, 260 °C per JEDEC-J-STD-020)
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.
ANT
LNA
202958-001
RX
TX
CBT CTX CRX
LEN
Figure 1. SKY85203-11 Block Diagram
Description
The SKY85203-11 integrates a single-pole, triple-throw (SP3T)
switch and low-noise amplifier (LNA) with a bypass mode in an
ultra-compact package. The device is capable of switching
between WLAN receive, WLAN transmit, and Bluetooth.
The SKY85203-11 is provided in a small Quad Flat No-Lead (QFN)
12-pin, 2 x 2 mm 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.
ANT
12
CTX
1
CRX
11
CBT
10
9
GND
TX
2
8
BT
GND
3
4
GND
5
RX
6
7
VDD
202958-002
LEN
Figure 2. SKY85203-11 Pinout
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202958H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 28, 2017
1
DATA SHEET • SKY85203-11: WLAN SWITCH/LNA FEM
Table 1. SKY85203-11 Signal Descriptions
Pin
1
2
3
4
5
6
CTX
TX
GND
GND
RX
LEN
Name
Control signal
Transmit input
Ground
Ground
LNA output
Control signal
Description
Pin
7
8
9
10
11
12
VDD
BT
GND
CBT
CRX
ANT
Name
Supply voltage
Bluetooth port
Ground
Control signal
Control signal
Antenna port
Description
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY85203-11 are provided
in Table 2. The recommended operating conditions are specified
in Table 3, and electrical specifications are provided in
Tables 4 to 8.
Table 2. SKY85203-11 Absolute Maximum Ratings
1
Parameter
Supply voltage
DC input on control pins
LNA input power (RXOUT terminated in 50
Ω
match):
LNA On mode
Bypass mode
Operating temperature
Storage temperature
T
A
T
STG
–40
–40
Symbol
V
BAT
, V
CC
V
IN
P
I
N
+5
+20
+85
+140
dBm
dBm
C
C
Minimum
–0.3
–0.3
Maximum
+5.5
+3.6
Units
V
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.
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. Recommended Operating Conditions
Parameter
Supply voltage relative to ground (= 0 V)
Control voltage:
High
Low
Control current:
High
Low
Operating temperature
V
DD
V
IH
V
IL
I
IH
I
IL
T
A
–40
+25
Symbol
Minimum
3.0
1.6
0
Typical
3.6
Maximum
5.0
3.6
0.4
5
1
+85
Units
V
V
V
μA
μA
C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2
April 28, 2017 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202958H
DATA SHEET • SKY85203-11: WLAN SWITCH/LNA FEM
Table 4. SKY85203-11 Electrical Specifications: DC Characteristics
1
(V
DD
= 3.6 V, T
A
= +25
C,
All Unused Ports Terminated with 50
Ω,
Unless Otherwise Noted)
Parameter
Supply current
I
CC
Symbol
Test Condition
LNA enabled
Transmit/BT mode
Bypass mode
All off
1 Performance is guaranteed only under the conditions listed in this table.
Min
Typical
11
8
8
8
Max
14
12
12
12
Units
mA
μA
μA
μA
Table 5. SKY85203-11 Electrical Specifications: Transmit (ANT to TX) Characteristics
1
(V
DD
= 3.6 V, T
A
= +25
C,
All Unused Ports Terminated with 50
Ω,
Unless Otherwise Noted)
Parameter
Frequency
Insertion loss
1 dB input compression point (TX port)
Transmit input return loss (TX port)
Output return loss (ANT port)
ANT to RX isolation, TX (loopback) mode
TX to ANT isolation @ 3.8
GHz:
All other modes
RX
ISO
20
1 Performance is guaranteed only under the conditions listed in this table.
Symbol
f
TX
IL
IP1dB
S11
S22
Test Condition
Min
2400
Typical
Max
2500
Units
MHz
dB
dBm
dB
dB
dB
dB
Insertion loss from TX
input to ANT port
+28
–15
–12
0.7
+31
–20
–18
42
27
1.1
Table 6. SKY85203-11 Electrical Specifications: Transmit (ANT to BT) Characteristics
1
(V
DD
= 3.6 V, T
A
= +25
C,
All Unused Ports Terminated with 50
Ω,
Unless Otherwise Noted)
Parameter
Frequency
Insertion loss
1 dB input compression point (BT port)
Transmit input return loss (BT port)
Output return loss (ANT port)
BT to ANT isolation @ 3.8
GHz:
All other modes
f
BT
IL
IP1dB
S11
S22
BT
ISO
Insertion loss from BT
input to ANT port
+28
–15
–15
20
Symbol
Test Condition
Min
2400
0.7
+31
–20
–20
25
Typical
Max
2500
1.1
Units
MHz
dB
dBm
dB
dB
dB
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
202958H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 28, 2017
3
DATA SHEET • SKY85203-11: WLAN SWITCH/LNA FEM
Table 7. SKY85203-11 Electrical Specifications: Receive (ANT to RX Port) Characteristics
1
(V
DD
= 3.6 V, T
A
= +25
C,
All Unused Ports Terminated with 50
Ω,
Unless Otherwise Noted)
Parameter
Frequency
Small signal gain
LNA gain step
f
S21
Gain_
STEP
LNA enabled
Bypass mode
Gain
step change
between LNA normal
and LNA bypass
modes
Over 20 MHz
Full band
NF
IIP3
S11
S22
t
RX
–
TX
(
BT
)
t
TX
(
BT
) –
RX
t
OFF
– t
ON
t
ON
– t
OFF
RX
ISO
10% to 90%
10% to 90%
10% to 90%
90% to 10%
20
25
LNA enabled
Bypass mode
LNA enabled
Bypass mode
+1
+24
1.9
6.5
+3
+27
–19
–14
–14
–8
500
500
500
200
Symbol
Test Condition
Min
2400
12
–9
14.5
–6.5
Typical
Max
2500
16
-5
Units
MHz
dB
dB
19
21
23
±0.25
±0.50
2.2
dB
dB
dB
dB
dB
dBm
dBm
dB
dB
ns
ns
ns
ns
dB
Gain
flatness
Noise figure
Third order input intercept point
Receive input return loss
Receive output return loss
Receive to transmit (or BT) switching time
Transmit (or BT) to receive switching time
LNA turn-on time
LNA turn-off time
RX to ANT isolation @ 3.8
GHz:
Non-RX modes
1 Performance is guaranteed only under the conditions listed in this table.
Table 8. SKY85203-11 Control Logic
Mode
All off
WLAN receive LNA
WLAN receive bypass
Bluetooth
WLAN transmit
Note:
CBT
(Pin 10)
0
0
0
1
0
CTX
(Pin 1)
0
0
0
0
1
LEN
(Pin 6)
0
1
0
0
0
CRX
(Pin 11)
0
1
1
0
0
“0” = 0 V to +0.4 V. “1” = +1.6 V to +3.6 V. Any state other than described in this table places the switch into an undefined state. An undefined state will not damage the device.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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April 28, 2017 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202958H
DATA SHEET • SKY85203-11: WLAN SWITCH/LNA FEM
Evaluation Board Description
The SKY85203-11 Evaluation Board is used to test the
performance of the SKY85203-11 LNA FEM. An Evaluation Board
schematic diagram is provided in Figure 3. A photograph of the
Evaluation Board is shown in Figure 4.
Evaluation Board Setup Procedure
1. Connect the system ground to pin 19 of connector J9.
2. Apply 3.3 V to VDD pin 17 of connector J9.
3. Refer to the Control Logic Table in Table 8 to set the device in
the desired mode of operation. Set CRX, CTX, CBT, and LEN to
appropriate VIL and VIH voltages, as specified in Table 3.
4. Transmit performance is monitored by applying an RF signal to
the connector J4 (TX) and measuring the output power at the
antenna port connector J3 (ANT).
5. Monitor the receive performance in either high gain or bypass
mode by applying an RF signal to the antenna port connector
J3 (ANT) and measuring the output power at the receive port
connector J2 (RX).
6. Monitor the Bluetooth performance by applying an RF signal to
the antenna port connector J1 (BT) and measuring the output
power at the receive port connector J3 (ANT).
Evaluation Board Losses
The total track losses from the RF connectors of the Evaluation
Board to the flip chip die bumps of the SKY85203-11 are:
ANT: 0.22 dB
TX: 0.22 dB
RX: 0.22 dB
BT: 0.36 dB
Package Dimensions
The PCB layout footprint for the SKY85203-11 is provided 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.
Package and Handling Information
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 SKY85203-11 is rated to Moisture Sensitivity Level 1 (MSL1)
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202958H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 28, 2017
5
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