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 Broadband operation: 0.1 to 3.0 GHz Attenuation: 15 dB with 1 dB LSB +5 V supply voltage and +2.0 V control voltage Small, QFN (16-pin, 3 x 3 mm) package (MSL1, 260 C per JEDEC J-STD-020) Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. 4 dB V2 2 dB V3 1 dB V4 201424-001 RF1 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 • [email protected] • www.skyworksinc.com 201424E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2016 1 V4 V3 V2 V1 DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR 16 15 14 13 VDD 1 12 N/C RF1 2 11 RF2 N/C 3 10 N/C RFGND1 4 9 N/C 8 RFGND4 7 N/C 6 RFGND3 RFGND2 5 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 affecting performance. 11 RF2 RF input/output to digital attenuator 4 RFGND1 Connect through external capacitor to ground. Capacitor value determines lower frequency operation of attenuator. 12 N/C No connection. Can be grounded without affecting performance. 5 RFGND2 Connect through external capacitor to ground. Capacitor value determines lower frequency operation of attenuator. 13 V1 DC control pin. See Table 4. 6 RFGND3 Connect through external capacitor to ground. Capacitor value determines lower frequency operation of attenuator. 14 V2 DC control pin. See Table 4. 7 N/C No connection. Can be grounded without affecting performance. 15 V3 DC control pin. See Table 4. 8 RFGND4 Connect through external capacitor to ground. Capacitor value determines lower frequency operation of attenuator. 16 V4 DC control pin. See Table 4. Electrical and Mechanical Specifications The absolute maximum ratings of the SKY12348-350LF are provided in Table 2. Electrical specifications are provided in Table 3. Typical performance characteristics of the SKY12348-350LF are illustrated in Figures 3 through 7. 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 • [email protected] • www.skyworksinc.com 2 March 25, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201424E DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR Table 2. SKY12348-350LF Absolute Maximum Ratings1 Parameter Symbol Minimum Maximum Units 6.0 V Supply voltage VDD 3.3 Control voltage VCTL 0 RF input power PIN VDD V +30 dBm Operating temperature TOP –40 +85 C Storage temperature TSTG –40 +125 C 1 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. Table 3. SKY12348-350LF Electrical Specifications1 (1 of 2) (VDD = 5 V, VCTL = 5 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units 0.8 1.0 1.2 1.0 1.2 1.4 dB dB dB 15 dB RF Specifications Insertion loss IL Attenuation range @ 0.7 GHz @ 2.1 GHz @ 2.7 GHz 0.1 to 3.0 GHz 1 Return loss RL 0.1 to 3.0 GHz Attenuation accuracy Attn 1 dB bit: 0.7 GHz 2.1 GHz 2.7 GHz 15 dB 0.8 0.8 0.8 1 1 1 1.2 1.2 1.3 dB dB dB 2 dB bit: 0.7 GHz 2.1 GHz 2.7 GHz 1.8 1.8 1.8 2 2 2 2.2 2.3 2.4 dB dB dB 4 dB bit: 0.7 GHz 2.1 GHz 2.7 GHz 3.8 3.8 3.8 4 4 4 4.3 4.4 4.4 dB dB dB 8 dB bit: 0.7 GHz 2.1 GHz 2.7 GHz 7.8 7.8 7.5 8 8 8 8.4 8.2 8.2 dB dB dB Max. attenuation (15 dB): 0.7 GHz 2.1 GHz 2.7 GHz 14.8 14.4 13.8 15 15 15 15.5 15.5 15.3 dB dB dB 0.1 dB input compression point IP0.1dB VDD = 3 V @ 1.8 GHz +30 dBm Third order input intercept point IIP3 PIN = +10 dBm/tone @ 1.8 GHz, VDD = 3 V, ΔF = 1 MHz, worst case in 16 states +45 dBm Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201424E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2016 3 DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR Table 3. SKY12348-350LF Electrical Specifications1 (2 of 2) (VDD = 5 V, VCTL = 5 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units 0.8 VDD V V 5.5 V DC Specifications Control voltage: Low High VCTL Supply voltage VDD Supply current IDD VDD = 5 V 75 μA Control current ICTL VDD = 3.3 V 5 μA 0 2.0 3.3 5.0 Switching Speed Specifications On/rise 50% control or 90% RF to 10% RF 200 ns Off/fall 50% control or 10% RF to 90% RF 180 ns 1 Performance is guaranteed only under the conditions listed in this table. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 March 25, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201424E DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR Typical Performance Characteristics (VDD = 5 V, VCTL = 5 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [Zo] = 50 Ω, , Unless Otherwise Noted) 0 0 –0.2 –5 –0.8 –1.0 –1.2 201424-003 –1.4 –1.6 –1.8 –10 –15 –20 –25 –30 –35 –40 0 0.5 1.0 1.5 2.0 2.5 0 3.0 0.5 1.0 Frequency (GHz) Figure 3. Insertion Loss vs Frequency @ 0 dB 0 dB 1 dB 2 dB 3 dB 1.5 2.0 2.5 4 dB 5 dB 6 dB 7 dB Figure 4. Input Return Loss vs Frequency 8 dB 9 dB 10 dB 11 dB +0.4 12 dB 13 dB 14 dB 15 dB +0.2 Attenuation Error (dB) 0 –2 –4 –6 –8 –10 0 –0.2 –0.4 –0.6 –0.8 900 MHz 1800 MHz 2100 MHz 2700 MHz –12 –1.0 201424-005 –14 –16 0 0.5 1.0 1.5 3.0 Frequency (GHz) 2.0 2.5 –1.2 0 1 2 3 4 3.0 5 6 7 8 9 10 11 12 13 201424-006 –2.0 Input Output 201424-004 Input Return Loss (dB) –0.6 14 15 Attenuation Setting (dB) Frequency (GHz) Figure 6. Attenuation Error vs Attenuation Setting Figure 5. Normalized Attenuation vs Frequency 2.0 900 MHz 1800 MHz 2100 MHz 2700 MHz 1.8 1.6 1.4 Step Error (dB) Input Return Loss (dB) Insertion Loss (dB) –0.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Attenuation Setting (dB) Figure 7. Step Error vs Attenuation Setting Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201424E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2016 5 DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR Table 4. SKY12348-350LF Truth Table RF1/RF2 (Pins 2 and 11) Attenuation V4 (Pin 16) V3 (Pin15) V2 (Pin 14) V1 (Pin 13) Insertion loss 1 1 1 1 1 dB 0 1 1 1 2 dB 1 0 1 1 4 dB 1 1 0 1 8 dB 1 1 1 0 15 dB 0 0 0 0 1 “1” = high control voltage: +3.3 to Vdd. “0” = low control voltage: 0 to +0.8 V. This table shows the logic required for the major bits and full attenuation. Bit states need to be used in combination to set the sum of the bits selected. Evaluation Board Description Package and Handling Information The SKY12348-350LF Evaluation Board is used to test the performance of the SKY12348-350LF digital attenuator. An assembly drawing for the Evaluation Board is shown in Figure 8 and an Evaluation Board schematic diagram is shown in Figure 9. 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 SKY12348-350LF is shown in Figure 10. Typical part markings are noted in Figure 11. Package dimensions are shown in Figure 12, and tape and reel dimensions are provided in Figure 13. The SKY12348-350LF 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 6 March 25, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201424E DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR 201424-008 DC Control 1 DC Control 2 13 V1 14 V3 V4 15 V2 16 DC Control 3 DC Control 4 Figure 8. SKY12348-350LF Evaluation Board Assembly Diagram 1 DC Power 12 N/C VDD 100 pF 2 RF Port 1 3 N/C 5 6 RFGND4 N/C RFGND3 RFGND1 RFGND2 N/C 4 100 pF RF2 RF1 × × 11 7 N/C RF Port 2 10 × 9 × 201424-009 8 × 330 pF 330 pF Figure 9. SKY12348-350LF Evaluation Board Schematic Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201424E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2016 7 DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR 16X 1.10 0.225 X 45o 0.25 1.70 4x Plated Through Vias 12X 0.50 Pitch See Detail A Metal Ground Pad 1.70 0.25 Exposed Soldering Area 0.60 Detail A 201424-010 All dimensions are in millimeters Figure 10. SKY12348-350LF PCB Layout Footprint Pin 1 Indicator Skyworks Part Number Lot Code Date Code: (Y = Calendar Year WW = Week) 201424-011 Figure 11. Typical Part Markings Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 March 25, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201424E DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR 1.70 +0.10/–0.15 –C– 3.00 (0.20) Seating Plane –A– –B– Pin 1 Indicator –A– Exposed Pad 0.85 0.02 + 0.03/–0.02 O.225 x 45o Pin 1 Indicator 0.85 –B– 3.00 0.15 C 2X 2X 1.70 +0.10/–0.15 Detail B 16X 2 0.08 C 0.15 C Detail A 0.75 ± 0.05 0.10 C Top View Side View Bottom View 0.40 ± 0.10 0.5 0.25 Notes: 1. All measurements are in millimeters. 2. Dimensions and tolerances according to ASME Y14.5M-1994. 3. Coplanarity applies to the exposed heat sink slug as well as the terminals.. 4. Plating requirement per source control drawing (SCD) 2504. 5. Exposed pads are matte tin plated. 0.25 +0.05/–0.07 0.10 M C A B 0.05 M C Detail A Scale: 20X 16 Places Detail B Scale: 10X 201424-012 Figure 12. SKY12348-350LF Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201424E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2016 9 DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR 4.00 ± 0.10 0.30 ± 0.05 (T) ∅1.50 + 0.1/–0.0 2.00 ± 0.05 8.00 ± 0.10 A 1.75 ± 0.10 5.50 ± 0.05 3.30 ± 0.10 (Bo) B A 12.00 ± 0.30 Pin 1 B 1.10 ± 0.10 (Ko) R0.25 Typ ∅1.50 Min Section B 3.30 ± 0.10 (Ao) Notes: 1. Carrier tape: black conductive polystyrene, non-bakeable material. 2. Cover tape material: transparent conductive HSA. 3. Cover tape size: 9.20 mm width. 4. ESD surface resistivity is ≥1 x 105 ~ ≤1 x 1010 Ohms/square per EIA, JEDEC tape and reel specification. 5. All measurements are in millimeters. Section A 201424-013 Figure 13. SKY12348-350LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 March 25, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201424E DATA SHEET • SKY12348-350LF: FOUR-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12348-350LF Digital Attenuator Manufacturing Part Number SKY12348-350LF Evaluation Board Part Numbers SKY12348-350LF-EVB Copyright © 2010-2011, 2016 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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