Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
SKY65971-11: 2 GHz, 256 QAM Low-Noise Amplifier
Applications
LNA_EN/BYPASS
VCC
 256 QAM, 802.11g/n WLANs
 2 GHz ISM radios
Bias
 Smart phones
 Notebooks, netbooks, tablets
 Access points, routers, gateways
RF_IN
RF_OUT
 Wireless video systems
–7 dB
S2581a
Features
 Ultra-low Noise Figure
Figure 1. SKY65971-11 LNA Block Diagram
 2.4 GHz to 2.5 GHz operation
 Enable/disable/bypass modes
Description
 High IIP3
The SKY65971-11 is an ultra Low-Noise Amplifier (LNA) intended
for 2 GHz, 256 Quadrature Amplitude Modulation (QAM) wireless
receiver applications. Its industry-leading Noise Figure (NF),
together with high linearity, make it ideal as a first-stage LNA in
256 QAM Wireless Local Area Network (WLAN) radios.
 High gain
 2.8 V to 3.6 V single-supply operation
 QFN (6-pin, 1.5 x 1.5 mm) package (MSL1, 260 C per JEDEC
J-STD-020)
Skyworks Pb-free products are compliant with
all applicable legislation. For additional
information, refer to Skyworks Definition of
Lead (Pb)-Free, document number SQ04-0073.
Operating with a single supply voltage, the SKY65971-11
consumes only 13 mA of current. The device includes a bypass
mode for near field applications and to save power when the
receiver is inactive.
The tiny package footprint of the SKY65971-11, requiring only
four external components, enables the industry’s smallest PCB
area needed to implement a 2 GHz LNA.
A block diagram of the SKY65971-11 is shown in Figure 1. The
device package and pinout for the 6-pin Quad Flat No-Lead (QFN)
are shown in Figure 2.
LNA_EN/BYPASS
1
6
VCC
RF_IN
2
5
RF_OUT
GND
3
4
GND
S2582
Figure 2. SKY65971-11 Pinout – 6-Pin QFN Package
(Top View)
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1
DATA SHEET • SKY65971-11 2 GHZ LNA
Technical Description
Production quantities of this product are shipped in a standard
tape and reel format.
The SKY65971-11 is fully matched at 50 Ω and requires only a
simple bypass circuit on pin 6 (VCC). The bypass/shutdown mode
is achieved by switching the LNA_EN signal (pin 1) to 0 V.
Electrical and Mechanical Specifications
Signal pin assignments and functional pin descriptions are
described in Table 1. The absolute maximum ratings of the
SKY65971-11 are provided in Table 2. The recommended
operating conditions are specified in Table 3 and electrical
specifications are provided in Table 4.
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.
Performance characteristics for the SKY65971-11 are illustrated
in Figures 3 through 8.
An application schematic diagram for the SKY65971-11 is shown
in Figure 9. The PCB footprint drawing for the SKY65971-11 is
provided in Figure 10. Typical part markings are shown in
Figure 11. The package dimensions for the 6-pin QFN are shown
in Figure 12, and the tape and reel dimensions are provided in
Figure 13.
The SKY65971-11 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.
Table 1. SKY65971-11 Pin Assignments and Signal Descriptions
Pin
Name
Description
1
LNA_EN/BYPASS
LNA enable (when pulled high) or bypass (when pulled low) control input
2
RF_IN
LNA RF input
3
GND
Ground
4
GND
Ground
5
RF_OUT
LNA RF output
6
VCC
Supply voltage for LNA
Table 2. Absolute Maximum Ratings (Note 1)
Minimum
Maximum
Units
Supply voltage
Parameter
VCC
Symbol
0
3.6
V
DC voltage at control ports
VENABLE
0
3.6
V
Power into LNA inputs
PIN, LNA
+10
dBm
Receive power (ANT terminated in 50 Ω match, OFDM, VCC = 3.45 V)
PIN
+5
dBm
Operating temperature
TA
–40
+85
C
Storage temperature
TSTG
–40
+125
C
Electrostatic Discharge, Human Body Model (HBM), Class 1C
ESD
1000
V
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 values. 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.
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DATA SHEET • SKY65971-11 2 GHZ LNA
Table 3. Recommended Operating Conditions (@ +25 °C, VCC = 3.3 V)
Parameter
Symbol
Minimum
Typical
0
Maximum
Units
3.6
V
Supply voltage
VCC
RF frequency range
f
2.4
2.5
GHz
Operating temperature range
TA
–40
+85
C
DC voltage at control port:
High
Low
VENABLE_H
VENABLE_L
1.8
0
3.6
0.2
V
V
Table 4. Electrical Characteristics (Note 1)
(VCC = 3.3 V, TA = +25 C, f = 2.4 to 2.5 GHz, VENABLE = 3.3 V, Unless Otherwise Noted)
Parameter
Symbol
Test Conditions
Minimum
Typical
13.0
14.5
Maximum
Units
Enable Mode (LNA_EN = 3.3 V)
Gain
|S21|
Gain flatness across band
|S21|
Out of band gain @ 5.18 GHz
S21_5.18
–8
Noise Figure
NF
1.3
rd
dB
0.3
dB
1.5
dB
3 Order Input Intercept Point
IIP3
+7
dBm
In-band 1 dB compression point at input
IP1dB
–1.5
dBm
Out-of-band (5.18 GHz injected signal) 1 dB
Input Compression Point
IP1dB
+4
dBm
Input return loss
|S11|
ZS/L = 50 
9
Output return loss
|S22|
ZS/L = 50 
12
Reverse isolation
S12
Maximum RF input (compliant)
dB
dB
–20
dB
–10
dBm
Maximum RF input (no damage)
+10
Drain current
13.0
Control enable current
IEN
dBm
17.5
mA
100
μA
Bypass Mode (LNA_EN = 0 V)
Gain
S21
–7
dB
Gain flatness across 80 MHz
|S21|
0.5
dB
Noise Figure
NF
1 dB Input Compression Point
IP1dB
Input return loss
|S11|
9
Output return loss
|S22|
12
Maximum RF input with harmonic
< –50 dBm/MHz (Note 2)
Switching speed: LNA to bypass mode and
bypass mode to LNA
7
dB
+15.3
dBm
dB
dB
+6
tS
dBm
300
ns
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Note 2: Harmonic leakage is measured at the RF_IN port.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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3
DATA SHEET • SKY65971-11 2 GHZ LNA
Typical Performance Characteristics
+20
+20
+10
+10
0
0
S-Parameters (dB)
S-Parameters (dB)
(VCC = 3.3 V, TA = +25 C, f = 2.4 to 2.5 GHz, VENABLE = 3.3 V, Unless Otherwise Noted)
–10
–20
–30
–40
–50
–20
–30
–40
–50
|S11| (dB)
|S21| (dB)
|S12| (dB)
|S22| (dB)
–60
–10
|S11| (dB)
|S21| (dB)
|S12| (dB)
|S22| (dB)
–60
–70
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
–70
2.40 2.41 2.42 2.43 2.44 2.45 2.46 2.47 2.48 2.49 2.50
Frequency (GHz)
Frequency (GHz)
Figure 4. Narrow Band S-Parameters vs Frequency (“On” State)
0
0
–10
–10
–20
–20
S-Parameters (dB)
S-Parameters (dB)
Figure 3. Broadband S-Parameters vs Frequency (“On” State)
–30
–40
–50
|S11| (dB)
|S21| (dB)
|S12| (dB)
|S22| (dB)
–60
–70
–30
–40
–50
|S11| (dB)
|S21| (dB)
|S12| (dB)
|S22| (dB)
–60
–70
2.40 2.41 2.42 2.43 2.44 2.45 2.46 2.47 2.48 2.49 2.50
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
Frequency (GHz)
Frequency (GHz)
Figure 5. Broadband S-Parameters vs Frequency (“Off” State)
Figure 6. Narrow Band S-Parameters vs Frequency (“Off” State)
2.0
+7.5
1.8
+7.0
IIP3 = 6.69
Input IP3 (dBm)
Noise Figure (dB)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2.40
IIP3 = 6.96
+6.5
IIP3 = 6.58
+6.0
+5.5
+5.0
+4.5
2.42
2.44
2.46
2.48
Frequency (GHz)
Figure 7. Noise Figure vs Frequency
2.50
+4.0
2.38
2.40
2.42
2.44
2.46
2.48
Frequency (GHz)
Figure 8. IIP3 vs Frequency
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2.50
2.52
DATA SHEET • SKY65971-11 2 GHZ LNA
1
LNA_EN/BYPASS
Control Input
10 pF
VCC
2
RF Input
RF_IN
RF_OUT
3
6
100 pF
5
0.1 μF
2.2 μF
VCC
RF Output
4
GND
GND
S2672
Figure 9. SKY65971-11 Schematic Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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0.53
1.90
0
0.48
DATA SHEET • SKY65971-11 2 GHZ LNA
0.375 Typ.
0.70
3X ø0.25
0.55
0.25 Typ.
6
1
0.500 Typ.
2
5
0
3
4
0.55
0
3
4
2X 1.185
Via Pattern
(Note 1)
0
Board Metal
2X ø0.457
2.00
1.90
0.475 Typ.
0.55
6
1
0.40
0.35 Typ.
6
1
0.25 Typ.
0.500 Typ.
0.500 Typ.
1.40
0.375 Typ.
2
5
3
4
1.20
2
5
3
4
62% Solder Coverage
on Center Pad
Solder Mask Pattern
(Note 2)
Package Outline
Stencil Pattern
(Note 3)
NOTES:
1. Via hole recommendations:
0.025 mm Cu via wall plating (minimum),
via holes to be plated shut or plugged and
capped, both sides.
2. Soldermask recommendations:
Contact board fabricator for recommended
soldermask offset and tolerance.
3. Stencil recommendations:
0.10 mm stencil thickness, laser cut apertures,
trapezoidal walls and rounded corners offer
better paste release.
Dimension and tolerancing according to ASME Y14.5M-1994.
Unless specified, dimensions are symmetrical about center lines.
All dimensions are in millimeters.
Figure 10. SKY65971-11 PCB Layout Footprint
(Top View)
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S3352
DATA SHEET • SKY65971-11 2 GHZ LNA
Pin 1
Indicator
Skyworks
Part Number
SKY1
5971
Figure 11. Typical Part Markings
(Top View)
C
A
1.5
0.02 +0.03/–0.02
B
Pin 1
Indicator
0.15 X 45o
Pin 1 Ind.
Seating Plane
0.70 +0.10/–0.15
2X 0.05
1.5
1.20 +0.10/–0.15
Detail B
0.10 C
2X
6X
3
Detail C
0.08 C
2X
0.10 C
Exposed Pad
0.41/0.50
0.10 C
Top View
Side View
Bottom View
6X 0.20 Min
0.175 ± 0.10
0.5
0.25 +0.05/–0.07 5
CL
0.10 C A B
2X R0.05
Detail C
Detail B
6 Places
All measurements are in millimeters.
Dimensioning and tolerancing according to ASME Y14.5M-1994.
Coplanarity applies to the exposed heat sink slug as well as the terminals..
Plating requirement per source control drawing (SCD) 2504.
Dimension applies to metalized terminal and is measured between 0.15 mm and 0.30 mm from terminal tip.
S1350
Figure 12. SKY65971-11 6-Pin QFN Package Dimensions
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DATA SHEET • SKY65971-11 2 GHZ LNA
Pin 1
4.00 ± 0.10
ϕ1.50± 0.10
2.00 ± 0.05
0.20 ± 0.02 (T)
5o Max
A
3.50 ± 0.05
1.78 ± 0.05 (Bo)
B
A
8.00 +0.30/–0.10
1.75 ± 0.10
B
0.69 ± 0.05 (Ko)
ϕ0.50± 0.05
B
5o Max
1.78 ± 0.05 (Ao)
A
Notes:
1. Carrier tape: black conductive polycarbonate or polystyrene.
2. Cover tape material: transparent conductive PSA.
3. Cover tape size: 5.4 mm width.
4. All measurements are in millimeters.
Figure 13. SKY65971-11 Tape and Reel Dimensions
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S1382a
DATA SHEET • SKY65971-11 2 GHZ LNA
Ordering Information
Model Name
SKY65971-11 2 GHz, 256 QAM LNA
Manufacturing Part Number
SKY65971-11
Evaluation Board Part Number
SKY65971-11-EK1
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