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 Figure 1. SKY12146-321LF Block Diagram Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 C per JEDEC J-STD-020) 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 sales skyworksinc.com 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 Name Description Pin Name Description 1 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 6 N/C No connection 12 N/C No connection Note: 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 RF input power PIN +30 dBm 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 The absolute maximum ratings of the SKY12146-321LF are pHEMTs as voltage-controlled attenuating elements. To maintain provided in Table 2. Electrical specifications are provided in impedance matching within operating frequencies, the GaAs Table 3. pHEMTs are coupled to the RF input and output through an Typical performance characteristics of the SKY12146-321LF are integrated hybrid-coupler. Since no temperature compensation is illustrated in Figures 3 through 8. used in this product, the attenuation value at any fixed bias voltage varies with operating temperature. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 April 11, 2011 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 200270J