DATA SHEET SKY12146-321LF: 3.0 – 3.8 GHz, 20 dB Variable Voltage Attenuator Applications • WLANs • WiMAX systems Features • Power control for 3.5 GHz fixed wireless applications • Typical attenuation: 20 dB • Control voltage:0 to 1.4 V • Low cost • No external components needed • Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 °C per JEDEC J-STD-020) Figure 1. SKY12146-321LF Block Diagram Description The SKY12146-321LF is a GaAs pHEMT variable voltage attenuator designed for WLAN and WiMAX applications. The device operates within 3.2 to 3.8 GHz and is ideal for low-cost applications such as 3.5 GHz fixed wireless LANs and WiMAX power control systems. The SKY12146-321LF is provided in a 12-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 Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200270J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011 1 DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR Figure 2. SKY12146-321LF Pinout – 12-Pin QFN (Top View) Table 1. SKY12146-321LF Signal Descriptions Pin # Description Pin # Name Description J1 RF input/output 7 N/C No connection 2 N/C No connection 8 N/C No connection 3 N/C No connection 9 J2 RF input/output 4 N/C No connection 10 N/C No connection 5 VC Voltage control 11 N/C No connection N/C No connection 12 N/C No connection 6 Note: Name 1 Exposed pad must be grounded. N/C pins may be grounded with no change in performance. Table 2. SKY12146-321LF Absolute Maximum Ratings Parameter Symbol Minimum Typical Maximum Units +30 dBm RF input power PIN Control voltage VCTL –0.5 +6.0 V Operating temperature TOP –40 +85 °C Storage temperature TSTG –65 +150 °C Note: 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. Technical Description Electrical and Mechanical Specifications The SKY12146-321LF Variable Voltage Attenuator uses GaAs pHEMTs as voltage-controlled attenuating elements. To maintain impedance matching within operating frequencies, the GaAs pHEMTs are coupled to the RF input and output through an integrated hybrid-coupler. Since no temperature compensation is used in this product, the attenuation value at any fixed bias voltage varies with operating temperature. The absolute maximum ratings of the SKY12146-321LF are provided in Table 2. Electrical specifications are provided in Table 3. Typical performance characteristics of the SKY12146-321LF are illustrated in Figures 3 through 8. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200270J DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR Table 3. SKY12146-321LF Electrical Specifications (Note 1) (TOP = 25 °C, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted) Parameter Insertion loss Symbol IL Test Condition Min Attn Return loss |S11| Switching characteristics: Rise, fall On, off Video feedthrough Max Units 1.4 1.5 1.6 1.8 dB dB dB VC = 1.4 V 2.7 to 3.2 GHz 3.2 to 3.8 GHz 3.8 to 4.0 GHz Attenuation Typical VC = 0 V 2.7 to 3.2 GHz 3.2 to 3.8 GHz 3.8 to 4.0 GHz 18.0 20.0 20.0 20.5 dB dB dB 2.7 to 3.2 GHz 3.2 to 3.8 GHz 3.8 to 4.0 GHz 11 12 14 27 dB dB dB 10/90% or 90/10% RF 50% VCTL to 90/10% RF TRISE = 1 ns, bandwidth = 500 MHz 50 150 ns ns 25 mV Maximum input power for <1 dB attenuation variation PIN 3.2 to 3.8 GHz +13 dBm 3rd Order Input Intercept Point IIP3 3.2 to 3.8 GHz +20 dBm Control voltage VCTL Control current ICTL 0 1.4 5 V μA Note 1: Performance is guaranteed only under the conditions listed in this Table. Typical Performance Characteristics (TOP = 25 °C, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted) Figure 3. Typical Insertion Loss (VC = 1.4 V) Figure 4. Typical Insertion Loss vs VC Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200270J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011 3 DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR Figure 5. Typical Input Return Loss vs VC Figure 6. Typical Output Return Loss vs VC Figure 7. Typical Loss vs Control Voltage Figure 8. IIP3 vs Frequency Evaluation Board Description Package and Handling Information The SKY12146-321LF Evaluation Board is used to test the performance of the SKY12146-321LF attenuator. An assembly drawing for the Evaluation Board is shown in Figure 9 and an Evaluation Board schematic diagram is shown in Figure 10. 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. Package Dimensions The PCB layout footprint for the SKY12146-321LF is shown in Figure 11. Typical case markings are noted in Figure 12. Package dimensions for the 12-pin QFN are shown in Figure 13, and tape and reel dimensions are provided in Figure 14. THE SKY12146-321LF 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 • [email protected] • www.skyworksinc.com 4 April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200270J DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR Figure 9. SKY12146-321LF Evaluation Board Assembly Diagram Figure 10. SKY12146-321LF Evaluation Board Schematic Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200270J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011 5 DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR Figure 11. SKY12146-321LF PCB Layout Footprint Figure 12. Typical Part Markings (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200270J DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR Figure 13. SKY12146-321LF 12-Pin QFN Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200270J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011 7 DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR Figure 14. SKY12146-321LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200270J DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR Ordering Information Model Name SKY12146-321LF Differential Digital Attenuator Manufacturing Part Number SKY12146-321LF Evaluation Board Part Numbers SKY12146-321LF-EVB Copyright © 2002-2008, 2010, 2011 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. 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Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200270J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011 9