DATA SHEET
SKY85601-11: 4.9 to 5.9 GHz SPDT Switch with Low-Noise
Amplifier
Applications
802.11 a/n WLANs
5 GHz ISM radios
Smartphones
Notebooks, netbooks, and tablets
Routers, access points, and gateways
Wireless video systems
VDD
SPDT
Switch
LNA
RX
TX
ANT
Features
201770-001
Low noise figure: 2.5 dB
Frequency range: 4.9 to 5.9 GHz
High IIP3: +6 dBm
High gain: 12 dB
Bypass mode with –5 dB insertion loss
High transmit to receive isolation for high-power applications
Small QFN (16-pin, 2.5 x 2.5 mm) package
(MSL1, 260
C
per JEDEC J-STD-020)
C0
C1
Figure 1. SKY85601-11 Block Diagram
Description
The SKY85601-11 is an integrated, single-pole double-throw
(SPDT) switch with a low-noise amplifier (LNA) intended for
wireless applications. The device has a low noise figure (NF) with
high linearity in the transmit mode.
The SKY85601-11 operates at 3.3 V and draws 15 mA of current.
In the transmit mode, a shutdown function saves power when the
device is inactive. The switch requires five external components.
The switch is manufactured in a compact, 2.5 x 2.5 mm, 16-pin
Quad Flat No-Lead (QFN) package. The small footprint provides
the industry’s smallest PCB area needed to implement an
integrated broadband SPDT switch with LNA functionality.
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.
GND
14
16
15
GND
RX
GND
C0
ANT
13
12
N/U
N/U
1
GND
N/U
N/U
N/U
2
11
3
10
4
5
6
7
8
9
C1
VDD
GND
TX
201770-002
Figure 2. SKY85601-11 Pinout
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201770H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • June 30, 2017
1
DATA SHEET • SKY85601-11: SPDT SWITCH WITH LNA
Table 1. SKY85601-11 Signal Descriptions
Pin
1
2
3
4
5
6
7
8
GND
RX
GND
C0
C1
VDD
GND
TX
Name
Ground
5 GHz LNA output signal
Ground
Switch control logic 1
Switch control logic 2
LNA supply voltage
Ground
5 GHz transmit input signal
Description
Pin
9
10
11
12
13
14
15
16
N/U
N/U
N/U
GND
ANT
GND
N/U
N/U
Name
Description
Not used (open circuit)
Not used (open circuit)
Not used (open circuit)
Ground
5 GHz antenna output
Ground
Not used (open circuit)
Not used (open circuit)
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY85601-11 are provided
in Table 2. The recommended operating conditions are specified
in Table 3 and electrical specifications are provided in Tables 4, 5,
and 6.
Typical performance characteristics of the SKY85601-11 are
illustrated in Figures 3 through 8.
Control logic for the SKY85601-11 SPDT switch is provided in
Table 7.
Table 2. SKY85601-11 Absolute Maximum Ratings
1
Parameter
Supply voltage
LNA power (receive mode)
Transmit input power (ANT terminated in
50
Ω
match, OFDM signal modulated at
MCS9 or less)
Switch logic control
Storage temperature
V
DD
P
RX
P
TXIN
+30
C0, C1
T
STG
0
–40
3.6
+125
dBm
V
C
Symbol
Minimum
3.0
Maximum
3.6
+3
Units
V
dBm
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. SKY85601-11 Recommended Operating Conditions
Parameter
Supply voltage: LNA, bias, and driver stage
Operating temperature
V
DD
T
A
Symbol
Min
3.0
–40
+25
Typ
Max
3.6
+85
Units
V
C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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June 30, 2017 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201770H
DATA SHEET • SKY85601-11: SPDT SWITCH WITH LNA
Table 4. SKY85601-11 Electrical Specifications: Control Logic Characteristics
1
(VDD = 3.3 V, T
A
= +25
C,
Unless Otherwise Noted)
Parameter
Supply current, receive mode
Symbol
I
CC
_802.11
A
Test Condition
C0 = 0 V, C1 = 3.3 V
C0 = C1 = 0 V
Supply current, off
Control voltage:
High
Low
Control line current:
High
Low
I
OFF
No RF, C0 = C1 = 0 V,
measured on VDD pin
1.6
–0.3
2
Min
Typ
15
0.02
20
70
3.6
+0.3
10
1
Max
Units
mA
mA
μA
V
V
μA
μA
V
IH
V
IL
I
CC
_
H
I
CC
_
L
1 Performance is guaranteed only under the conditions listed in this table.
Table 5. SKY85601-11 Electrical Specifications: Receive AC Characteristics
1
(C1 = 3.3 V, C0 = 0 V, T
A
= +25
C,
All Unused Ports Terminated with 50
Ω,
Unless Otherwise Noted)
Parameter
Frequency
Insertion loss
Receive gain
f
IL
Bypass mode: C0 = C1 = 0 V
High gain mode:
4.90 GHz to 5.20 GHz
5.20 GHz to 5.85 GHz
Noise figure
TX to RX port isolation
Input return loss
2
Output return loss
2
1 dB Input compression point
NF
Iso
S11
S22
IP1dB
High gain mode
C0 = 3.3 V, C1 = 0 V
@ ANT port
@ RX output
@ ANT port, high gain mode
LNA bypass mode
Interferer amplitude (maximum 2.4 GHz)
Transmit/receive switching speed
t
ON
, t
OFF
1 dB degradation of IP1dB
C0 and C1 (50%) to RF output
(10% or 90%)
300
11.0
11.5
Symbol
Test Condition
Min
4.90
–5
13.0
13.5
2.5
50
10
8
–5
+10
0
Typ
Max
5.85
Units
GHz
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
ns
1 Performance is guaranteed only under the conditions listed in this table.
2 Refer to Figures 5 and 6.
Table 6. SKY85601-11 Electrical Specifications: Transmit AC Characteristics
1
(C0 = 3.3 V, C1 = 0 V, T
A
= +25
C,
All Unused Ports Terminated with 50
Ω,
Unless Otherwise Noted)
Parameter
Frequency
Insertion loss
Input return loss
Output return loss
Maximum input power
f
IL
S11
S22
Pin
@ TX input port
@ ANT port
Harmonic contribution from
switch or LNA < –50 dBm/MHz
OFDM, MCS9 or better
Symbol
Test Condition
Min
4.90
–0.75
–15
–15
Typ
Max
5.85
Units
GHz
dB
dB
dB
+30
dBm
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
201770H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • June 30, 2017
3
DATA SHEET • SKY85601-11: SPDT SWITCH WITH LNA
Typical Performance Characteristics
(VDD = 3.3 V, T
A
= +25
C,
Unless Otherwise Noted)
+20
0
4.0
Noise Figure (dB)
3.5
3.0
2.5
2.0
201770-003
Gain
(dB)
–20
–40
–60
–80
0.1
1.1
2.1
3.1
ANT to Receive LNA Enable
ANT to Receive LNA Bypass
TX to ANT
TX to RX Isolation
1.5
1.0
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
4.1
5.1
6.1
7.1
8.1
Frequency (GHz)
Figure 3. Noise Figure vs Frequency
Frequency (GHz)
Figure 4. Small Signal Gain vs Frequency
Output Return Loss (dB)
0
0
–10
–20
–30
–40
0.1
Input Return Loss (dB)
–10
–20
–30
–40
LNA Enable
LNA Bypass
Transmit
201770-005
0.1
1.1
2.1
3.1
4.1
5.1
6.1
7.1
8.1
1.1
2.1
3.1
4.1
5.1
6.1
7.1
8.1
Frequency (GHz)
Figure 5. Input Return Loss vs Frequency
Frequency (GHz)
Figure 6. Output Return Loss vs Frequency
+5
+3
+10
+8
IP1dB (dBm)
IIP3 (dBm)
+1
–1
201770-007
+6
+4
+2
0
–22
–20
–18
–16
–14
–12
201770-008
–3
–5
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
4900 MHz
5400 MHz
5900 MHz
5.9
–10
Frequency (GHz)
Figure 7. IP1dB vs Frequency
Input Power (dBm)
Figure 8. IIP3 vs Input Power
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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June 30, 2017 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201770H
201770-006
LNA Enable
LNA Bypass
Transmit
201770-004
DATA SHEET • SKY85601-11: SPDT SWITCH WITH LNA
Table 7. SKY85601-11 Switch Control Logic
ANT
Receive bypass
Receive LNA on
Transmit on
All off
Note:
“Off” = 0 V. “On” = +3.3 V.
C0
Off
Off
On
On
C1
Off
On
Off
On
Evaluation Board Description
The SKY85601-11 Evaluation Board is used to test the
performance of the SKY85601-11 SPDT Switch. An Evaluation
Board schematic diagram is provided in Figure 9. Table 8
provides the Bill of Materials (BOM) for Evaluation Board
components. A photograph of the Evaluation Board is shown in
Figure 10.
Evaluation Board Setup Procedure
1. Connect system ground to pin 2 of connector J5.
2. Apply 3.3 V to pin 9 of connector J5.
3. Test the RF paths as described by the control logic in Table 7.
RF Port Configuration
The ANT and TX ports are DC-blocked and do not require DC
blocking capacitors.
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
> 2.5 V DC on the trace connecting to the RX port.
Evaluation Board Losses
The board losses from the RF connectors of the Evaluation Board
to the pins of the SKY85601-11 are shown below.
Loss (dB)
Signal
TX
RX
ANT
4.9 GHz
0.28
0.15
0.15
5.4 GHz
0.25
0.19
0.19
5.9 GHz
0.37
0.20
0.20
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201770H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • June 30, 2017
5
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