DATA SHEET SKY12355-337LF: 0.35 to 4.0 GHz Two-Bit Digital Attenuator Applications Cellular infrastructure Wireless receivers Features Positive voltage operation with integrated decoder Broadband operation: 0.35 to 4.0 GHz Attenuation: 18 dB with 6 dB LSB Low insertion loss: 0.6 dB @ 2 GHz Absorptive in 50 Ω systems Small QFN (12-pin, 3 x 3 mm) package (MSL1, 260 C per JEDEC J-STD-020) VCTL1 VCTL2 VDD 11 RF1 2 8 RF2 N/C 3 7 N/C 6 N/C GND N/C 9 N/C GND 1 5 VCTL2 12 dB RF2 Figure 1. SKY12355-337LF Block Diagram Description The SKY12355-337LF is a GaAs pHEMT two-bit digital attenuator I/C. The device is provided in a 3 x 3 mm, 12-pin Quad Flat NoLead (QFN) package. The SKY12355-337LF is particularly suited for low-cost commercial applications for which high attenuation accuracy, low insertion loss, and low intermodulation products are required. 10 4 6 dB VDD Skyworks GreenTM products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of GreenTM, document number SQ04–0074. 12 VCTL1 202281-001 RF1 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. 202281-002 Figure 2. SKY12355-337LF Pinout (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 26, 2016 1 DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR Table 1. SKY12355-337LF Signal Descriptions1 Pin Name Description Pin Name Description 1 GND Ground 7 N/C No connection required. May be connected to ground with no change in performance. 2 RF1 RF port. Must be DC blocked. 8 RF2 RF port. Must be DC blocked. 3 N/C No connection required. May be connected to ground with no change in performance. 9 GND Ground 4 N/C No connection required. May be connected to ground with no change in performance. 10 VCTL2 DC control voltage. Controls 12 dB attenuation state. Refer to Table 4. 5 N/C No connection required. May be connected to ground with no change in performance. 11 VCTL1 DC control voltage. Controls 6 dB attenuation state. Refer to Table 4. 6 N/C No connection required. May be connected to ground with no change in performance. 12 VDD DC power supply. 1 Exposed pad must be grounded. Functional Description Electrical and Mechanical Specifications This attenuator has a least significant bit (LSB) of 6 dB and a most significant bit (MSB) of 12 dB for a total of 18 dB available attenuation. Pins 10 and 11 (VCTL2 and VCTL1) control the state of the 6 dB and 12 dB attenuation bits, respectively. For each bit, a logic high enables the attenuation state while a logic low enables a low insertion loss state. The absolute maximum ratings of the SKY12355-337LF are provided in Table 2. Electrical specifications are provided in Table 3. The state of the SKY12355-337LF is determined by the logic provided in Table 4. The VCTL1 and VCTL2 signals control the 6 dB and 12 dB attenuation bits, respectively. For each bit, a logic high enables the attenuation state, while a logic low enables the insertion loss state. Typical performance characteristics are illustrated in Figures 3 to 6. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 April 26, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281E DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR Table 2. SKY12355-337LF Absolute Maximum Ratings1 Parameter Supply voltage Symbol Minimum Typical Maximum Units 5.5 V VDD Control voltage VCTL1, VCTL2 VDD + 0.1 V RF input power @ 3 V PIN +28 dBm PIN PIN_105C +28 +21 dBm dBm RF input power: TCASE ≤ +85 °C TCASE = +105 °C Operating temperature TOP –40 +105 C Storage temperature TSTG –65 +150 C Junction temperature TJC –65 +150 C Electrostatic discharge: ESD 1000 250 100 V V V Charged-Device Model (Class 4) Human Body Model (Class 1A) Machine Model (Class A) 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. ESD HANDLING: 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 when handling or transporting. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industrystandard ESD handling precautions should be used at all times. Table 3. SKY12355-337LF Electrical Specifications1 (1 of 2) (VDD = 3 V, VCTL = 0 to 3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, C1 and C2 = 1000 pF, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units 0.45 0.65 0.65 0.75 0.80 0.80 0.90 1.00 dB dB dB dB Insertion loss IL 350 to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz Attenuation accuracy (normalized to insertion loss) Att @ 6 dB: 350 MHz to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz 5.7 5.9 6.1 6.1 6.0 6.2 6.4 6.4 6.3 6.5 6.7 6.7 dB dB dB dB @ 12 dB: 350 MHz to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz 11.9 12.0 11.9 11.8 12.2 12.3 12.2 12.1 12.5 12.6 12.5 12.4 dB dB dB dB @ 18 dB: 350 MHz to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz 17.9 18.3 18.3 18.3 18.3 18.6 18.6 18.6 18.7 18.9 18.9 18.9 dB dB dB dB Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 26, 2016 3 DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR Table 3. SKY12355-337LF Electrical Specifications1 (2 of 2) (VDD = 3 V, VCTL = 0 to 3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, C1 and C2 = 1000 pF, Unless Otherwise Noted) Parameter Symbol Return loss |S11| Switching characteristics: Rise/fall time On/off time Attenuation amplitude settling Test Condition Min Typical 10 14 12 12 20 22 19 19 dB dB dB dB 10% RF to 90% RF or 90% RF to 10% RF 8 ns 50% VCTL to 90% RF or 50% VCTL to 10% RF 37 350 to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz 500 ns to 5 ms Phase settling (by design) 500 ns to 5 ms 1 dB input compression point IP1dB 0.1 dB input compression point IP0.1dB Third order input intercept point IIP3 Supply voltage –2 dB +2 deg dBm VCTL = 3 V, 500 MHz to 4 GHz, all states +19 dBm dBm Tone spacing = 20 MHz, power/tone = +18 dBm, VDD = VCTL1 = VCTL2 = 3.3 V, 500 MHz to 4 GHz: Insertion loss state +48 +50 All attenuation states +44 +47 dBm 3 5 V 3 0 0.7 × VDD 5 0.3 × VDD VDD V V V 50 μA VCTL = low and VCTL = high Supply current ns 0.25 +28 VDD VCTL = low VCTL = high Control current μA 10 IDD 20 1 Performance is guaranteed only under the conditions listed in this table. Table 4. SKY12355-337LF Truth Table State VDD VCTL1 VCTL2 Insertion loss High Low Low 6 dB High High Low 12 dB High Low High 18 dB High High High 1 High = 0.7 × VDD to VDD Low = 0 to 0.3 × VDD Any state other than described in this table places the attenuator into an undefined state. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 Units VCTL = 3 V, 500 MHz to 4 GHz, insertion state VDD Control voltage Max April 26, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281E DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR Typical Performance Characteristics (VDD = 3 V, VCTL = 0 to 3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [Zo] = 50 Ω, C1 and C2 = 1000 pF, Unless Otherwise Noted) 0 0 6 dB 12 dB 18 dB –4 –1.0 –1.5 –2.0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 –6 –8 –10 –12 –14 202281-004 Attenuation (dB) –0.5 –16 202281-003 Insertion Loss (dB) –2 –18 –20 5.0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Frequency (GHz) Frequency (GHz) Figure 4. Attenuation vs Frequency (Normalized to Insertion Loss) Figure 3. Insertion Loss vs Frequency +5 0 6 dB 12 dB 18 dB +3 –10 +1 0 –1 –2 –3 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Frequency (GHz) Figure 5. Attenuation Error vs Frequency (Normalized to Insertion Loss) 4.5 5.0 –15 –20 –25 –30 202281-006 Return Loss (dB) +2 –4 Insertion Loss 6 dB 12 dB 18 dB –5 202281-005 Attenuation Error (dB) +4 –35 –40 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Frequency (GHz) Figure 6. Return Loss vs Frequency Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 26, 2016 5 DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR Evaluation Board Description Package and Handling Information The SKY12355-337LF Evaluation Board is used to test the performance of the SKY12355-337LF digital attenuator. An Evaluation Board schematic diagram is shown in Figure 7. Table 5 provides the Bill of Materials (BOM) list for Evaluation Board components. An assembly drawing for the Evaluation Board is shown in Figure 8. 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 SKY12355-337LF 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. The PCB layout footprint for the SKY12355-337LF is shown in Figure 9. Typical part markings are noted in Figure 10. Package dimensions are shown in Figure 11, and tape and reel dimensions are provided in Figure 12. 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. Control Voltage Supply Voltage Control Voltage VCTL2 10 VCTL1 11 VDD 12 1 RF2 N/C N/C N/C × 3 RF1 4 × 5 × 9 C2 8 7 RF2 × N/C 2 GND N/C C1 RF1 GND 6 × 202281-007 Figure 7. SKY12355-337LF Evaluation Board Schematic Diagram Table 5. SKY12355-337LF Evaluation Board Bill of Materials1 Component Value C1, C2 1000 pF Size 0402 Manufacturer/Part Series Murata GRM Series 1 Blocking capacitors are required on both RF ports for proper functionality. Value of DC blocking capacitor determines lower frequency operation. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 April 26, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281E VCTL1 VCTL2 VDD DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR RF1 RF2 202281-008 Figure 8. SKY12355-337LF Evaluation Board Assembly Diagram 12X 0.95 (To Metal Pads) 1.15 (Sq.) Solder Area Pitch 0.50 4X Ground Vias See Detail A 0.25 Solder Area 0.75 All measurements in millimeters Detail A 12X Scale = 48X 202281-009 Figure 9. SKY12355-337LF PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 26, 2016 7 DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR Pin 1 Indicator Skyworks Part Number Lot Code 202281-010 Figure 10. Typical Part Markings 1.150 +0.10/–0.15 C (0.20) Seating Plane 0.02 + 0.03/–0.02 A 3 B Pin 1 Indicator 1.000 0.575 Exposed Pad Detail A 0.575 3 1.000 B 1.150 +0.10/–0.15 0.15 C 2X Detail C 0.90 ± 0.10 2X 0.10 C Top View 0.20 Min. 12X 12X 4 0.08 C 0.15 C Side View A Detail B Bottom View R0.125 Typ. 0.18 0.55 +0.10 0.18 0.435 5 0.10 M C A B 0.435 0.5 0.25 +0.05/–0.07 0.05 M C Detail A Detail B Detail C Scale: 20X Scale: 20X Scale: 40X 12 Places Notes: 1. All measurements are in millimeters. 2. Dimensions and tolerances according to ASME Y14.5M-1994. 3. Unilateral coplanarity applies to the exposed heat sink pad as well as the terminals. 4. Plating requirement per source control drawing (SCD) 2504. 5. Dimension applies to metallized terminal and is measured between 0.15 and 0.30 mm from the terminal tip. Do not measure at radius area. Figure 11. SKY12355-337LF Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 April 26, 2016 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281E 202281-011 DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR 8.00 2.00 ± 0.05 (See Note 3) ø1.50 Min 4.00 (See Note 1) 0.30 ± 0.05 Pin 1 Indicator ø1.5 +0.1/–0 A 1.75 ± 0.10 R0.30 Max 5.50 ± 0.05 (See Note 3) 12.0 ± 0.30 3.30 (Bo) A 1.10 (Ko) A 3.30 (Ao) 0.25 R0.25 Notes: 1. Sprocket hole pitch cumulative tolerance: ±0.2. 2. Carrier tape: black conductive polystyrene. 3. Pocket position relative to sprocket hole, measure as true position of pocket, not pocket hole. 4. Cover tape material: transparent conductive PSA, 9.30 mm wide. 5. All dimensions are in millimeters. 202281-012 Figure 12. SKY12355-337LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 26, 2016 9 DATA SHEET • SKY12355-337LF: TWO-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12355-337LF: Digital Attenuator Manufacturing Part Number SKY12355-337LF Evaluation Board Part Numbers SKY12355-337LF-EK1 Copyright © 2012-2013, 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. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. 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