DATA SHEET SKY12348-350LF: 0.1-3.0 GHz Four-Bit Digital Attenuator (1 dB LSB) RF2 Applications Cellular, 3G/4G, WiMAX, and LTE Infrastructures RF and IF systems 8 dB V1 Features 4 dB Broadband operation: 0.1 to 3.0 GHz V2 Attenuation: 15 dB with 1 dB LSB +5 V supply voltage and +2.0 V control voltage 2 dB Small, QFN (16-pin, 3 x 3 mm) package V3 (MSL1, 260 C per JEDEC J-STD-020) 1 dB V4 Skyworks Green products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks 201424-001 Denition of Green, document number RF1 SQ04-0074. Figure 1. SKY12348-350LF Block Diagram Description The SKY12348-350LF is a GaAs pHEMT four-bit broadband digital attenuator with a 1 dB Least Significant Bit (LSB). The attenuator features low insertion loss, excellent attenuation accuracy, a 15 dB attenuation range, and high linearity performance. The SKY12348-350LF is an ideal choice for a wide variety of cellular 3G and 4G infrastructure applications. Attenuation is controlled by four DC control pins (V1, V2, V3, and V4). Depending on the control bias, the attenuation state between the RF1 and RF2 pins can vary between a low insertion loss state or up to 15 dB. The device is provided in a 3 x 3 mm, 16-pin 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 201424E Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice March 25, 2016 1 DATA SHEET SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR 16 15 14 13 1 12 VDD N/C 2 11 RF1 RF2 N/C 3 10 N/C 4 9 RFGND1 N/C 5 6 78 201424-002 Figure 2. SKY12348-350LF Pinout (Top View) Table 1. SKY12348-350LF Signal Descriptions Pin Name Description Pin Name Description 1 VDD DC power supply 9 N/C No connection. Can be grounded without affecting performance. 2 RF1 RF input/output to digital attenuator 10 N/C No connection. Can be grounded without affecting performance. 3 N/C No connection. Can be grounded without 11 RF2 RF input/output to digital attenuator affecting performance. 4 RFGND1 Connect through external capacitor to 12 N/C No connection. Can be grounded without ground. Capacitor value determines lower affecting performance. frequency operation of attenuator. 5 RFGND2 Connect through external capacitor to 13 V1 DC control pin. See Table 4. ground. Capacitor value determines lower frequency operation of attenuator. 6 RFGND3 Connect through external capacitor to 14 V2 DC control pin. See Table 4. ground. Capacitor value determines lower frequency operation of attenuator. 7 N/C No connection. Can be grounded without 15 V3 DC control pin. See Table 4. affecting performance. 8 RFGND4 Connect through external capacitor to 16 V4 DC control pin. See Table 4. ground. Capacitor value determines lower frequency operation of attenuator. Electrical and Mechanical Specifications The absolute maximum ratings of the SKY12348-350LF are Typical performance characteristics of the SKY12348-350LF are provided in Table 2. Electrical specifications are provided in illustrated in Figures 3 through 7. Table 3. The state of the SKY12348-350LF is determined by the logic provided in Table 4. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 March 25, 2016 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 201424E RFGND2 V4 RFGND3 V3 N/C V2 RFGND4 V1