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DATA SHEET
AS218-321, AS218-321LF: PHEMT GaAs IC High Power Transfer Switch DC-6 GHz
Applications
QFN-12
0.118 (3.00 mm) 0.008 (0.20 mm) Seating Plane 0.001 (0.02 mm) 0.118 (3.00 mm) Pin 1 Indicator
WLAN 802.11a, b, g diversity
Features

Operating frequency DC-6 GHz Positive low voltage control (0/+3 V operation) Low insertion loss PHEMT process Available lead (Pb)-free MSL-1 @ 250 C per JEDEC J-STD-020
0.029 (0.73 mm) Exposed pad
0.007 (0.180 mm)
0.030 (0.75 mm) 0.002 (0.05 mm) 0.017 (0.435 mm) Sq. Pin 1 Indicator
Description
The AS218-321 is a broadband transfer switch designed to combine T/R and antenna diversity switching functions on a single IC. The device is designed to handle high power and maintain high linearity at low control voltages. This low cost switch is ideal for Wi-Fi systems and is capable of covering both the 2.4 and 5 GHz bands.
0.009 (0.23 mm) + 0.003 (0.07 mm) - 0.002 (0.05 mm) 0.0196 (0.50 mm) BSC
0.057 (1.45 mm) Sq. + 0.004 (0.10 mm) - 0.006 (0.15 mm)
0.022 (0.55 mm) 0.004 (0.10 mm)
NEW
Skyworks offers lead (Pb)-free "environmentally friendly" packaging that is RoHS compliant (European Parliament for the Restriction of Hazardous Substances).
Electrical Specifications at 25 C (0, +3 V)
Parameter(1, 4) Insertion loss(2) Condition Ant 1, Ant 2 to TX, RX Frequency 0.10-6.00 GHz 2.40-2.50 GHz 5.15-5.85 GHz 0.10-6.00 GHz 2.40-2.50 GHz 5.15-5.85 GHz 0.10-6.00 GHz 0.10-6.00 GHz 2.40-2.50 GHz 5.15-5.85 GHz
3. Return loss for insertion loss state. 4. TX and RX paths can be used interchangeably.
Min.
Typ. 1.6 1.2 1.4
Max. 1.8 1.4 1.6
Unit dB dB dB dB dB dB dB dB dB dB
Isolation
Ant 1, Ant 2 to TX, RX
17 26 17
19 28 19 6 10 15 20
Isolation Return loss(3)
V 1 = V2 Ant 1, Ant 2 to TX, RX
1. All measurements made in a 50 system. 2. Insertion loss changes by 0.003 dB/C.
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
200082 Rev. B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * January 7, 2005
1
DATA SHEET * AS218-321, AS218-321LF
Operating Characteristics at 25 C (0, +3 V)
Parameter 2nd and 3rd harmonic P1 dB IIP3 Control voltages 20 dBm per tone 22 dBm per tone VLOW = 0-0.2 V @ 20 A max. VHIGH = 3-5 V @ 200 A max. Condition 23 dBm input @ 0,+3 V Frequency 2-6 GHz 2-6 GHz 2-3 GHz 5-6 GHz Min. Typ. 63 33 54 47 Max. Unit dBc dBm dBm dBm
Typical Performance Data (0, +3 V)
0 -0.2 -0.4 0 -5 A1-TX Path -10
Insertion Loss (dB)
-0.6 -0.8 -1.0 -1.2 -1.4 -1.6 -1.8 -2.0
Isolation (dB)
-15 -20 -25 -30 -35 -40
A1-RX Path
A2-TX Path
A1-A2 TX-RX A2-RX Path A1-TX Path A2-TX Path A1-RX Path 0.6 1.2 1.8 2.4 3.0 3.6 4.2 4.8 5.4 6.0
A2-RX Path
0.6 1.2 1.8 2.4 3.0 3.6 4.2 4.8 5.4 6.0
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
0 -5 -10
Isolation vs. Frequency
Absolute Maximum Ratings
Characteristic A1-TX Path A2-TX Path RF input power Control voltage Operating temperature A2-RX Path A1-RX Path Storage temperature JC Value +35 dBm > 500 MHz 0/+7 V control -0.2 V, +8 V -40 C to +85 C -65 C to +150 C 25 C/W
Return Loss (dB)
-15 -20 -25 -30 -35 -40 -45 -50
0.6 1.2 1.8 2.4 3.0 3.6 4.2 4.8 5.4 6.0
Performance is guaranteed only under the conditions listed in the specifications table and is not guaranteed under the full range(s) described by the Absolute Maximum specifications. Exceeding any of the absolute maximum/minimum specifications may result in permanent damage to the device and will void the warranty.
Frequency (GHz)
Return Loss vs. Frequency
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 must be employed at all times.
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 2
January 7, 2005 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * 200082 Rev. B
DATA SHEET * AS218-321, AS218-321LF
Truth Table
V1 0 1 0 1
"1" = +3 to +5 V. "0" = 0 to +0.2 V.
Pin Out (Top View)
CBL GND
11 10
V2 1 0 0 1
Insertion Loss Path Ant 1 to TX, Ant 2 to RX Ant 2 to TX, Ant 1 to RX Allowed but not recommended Allowed but not recommended
GND GND V1
12
CBL
RX
TX
GND GND V2
CBL
Ant 1
GND
DC blocking capacitors (CBL) required on RF ports. CBL = 15 pF.
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
200082 Rev. B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * January 7, 2005
Ant 2
CBL
1 2 3 4 5 6
9 8 7
3
DATA SHEET * AS218-321, AS218-321LF
Copyright (c) 2002, 2003, 2004, Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. ("Skyworks") products. These materials 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. Skyworks may make changes to its documentation, products, specifications and product descriptions at any time, without notice. Skyworks makes no commitment to update the information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from future changes to its documentation, products, specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by or under this document. Except as may be provided in Skyworks Terms and Conditions of Sale for such products, Skyworks assumes no liability whatsoever in association with its documentation, products, specifications and product descriptions. THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED OR OTHERWISE, RELATING TO SALE AND/OR USE OF SKYWORKS PRODUCTS INCLUDING WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. SKYWORKS FURTHER 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 SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THESE MATERIALS WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. The following are trademarks of Skyworks Solutions, Inc.: SkyworksTM, the Skyworks logo, and Breakthrough SimplicityTM. Product names or services listed in this publication are for identification purposes only, and may be trademarks of Skyworks or other third parties. Third-party brands and names are the property of their respective owners. Additional information, posted at www.skyworksinc.com, is incorporated by reference.
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 4
January 7, 2005 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * 200082 Rev. B

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