DATA SHEET SKY12408-321LF: 50-600 MHz, 6 dB 100 Differential Digital Attenuator Applications Cellular/3G infrastructure IF/RF systems Features Dual, positive voltage operation: 0/1.8-5.0 V High bit accuracy: 0.3 dB 200 MHz Low insertion loss: 0.3 dB 200 MHz Absorptive in 100 differential systems Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 C per JEDEC J-STD-020) Figure 1. SKY12408-321LF Block Diagram Description The SKY12408-321LF is a GaAs pHEMT two-bit attenuator I/C. The device is provided in a 3 x 3 mm 12-pin Quad Flat No-Lead (QFN) package. The SKY12408-321LF is particularly suited for 100 differential systems for which high attenuation accuracy, low insertion loss, and low intermodulation products are required. The attenuators differential input and output impedance is 100 . The device is controlled by two positive DC voltage control pins. The differential attenuator paths are controlled together and can be in either an insertion loss or a 6 dB attenuation state. In a differential system, the attenuator presents a 100 impedance, but can be used as two single-ended attenuators, each with a 50 impedance. 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 202025B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 7, 2012 1 DATA SHEET SKY12408-321LF DIFFERENTIAL DIGITAL ATTENUATOR Figure 2. SKY12408-321LF Pinout 12-Pin QFN (Top View) Table 1. SKY12408-321LF Signal Descriptions Pin Name Description Pin Name Description 1 RFIP Positive RF input. Comprises J1 along with 7 RFON Negative RF output. Comprises J2 along pin 3. Must be DC blocked from external with pin 9. Must be DC blocked from circuit. external circuit. 2 CBYPASS1 Must be AC-coupled to external circuit 8 CBYPASS2 Must be AC-coupled to external circuit ground. ground. 3 RFIN Negative RF input. Comprises J1 along with 9 RFOP Positive RF output. Comprises J2 along with pin 1. Must be DC blocked from external pin 7. Must be DC blocked from external circuit. circuit. 4 GND Ground 10 VCTL2 Control voltage input. 5 GND Ground 11 GND Ground 6 GND Ground 12 VCTL1 Control voltage input. Note: Exposed pad must be grounded. Table 2. SKY12408-321LF Absolute Maximum Ratings Parameter Symbol Minimum Maximum Units RF input power 5 V PIN +32 dBm Control voltage VCTL 6 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. Typical performance characteristics of the SKY12408-321LF are Electrical and Mechanical Specifications illustrated in Figures 3 through 6. The absolute maximum ratings of the SKY12408-321LF are provided in Table 2. Electrical specifications are provided in The state of the SKY12408-321LF is determined by the logic Table 3. provided in Table 4. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 September 7, 2012 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 202025B