DATA SHEET SKY12361-350LF: 0.1 to 3.7 GHz Four-Bit Digital Attenuator (1 dB LSB) Applications RF2 Cellular, 3G/4G, WiMAX, and LTE Infrastructures RF and IF systems 8 dB V1 Features Broadband operation: 0.1 to 3.7 GHz Attenuation: 15 dB with 1 dB LSB +5 V supply voltage and +3.3 V control voltage 4 dB V2 Small, QFN (16-pin, 3 x 3 mm) package (MSL1, 260 C per JEDEC J-STD-020) 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. 2 dB V3 1 dB V4 S2242 RF1 V4 V3 V2 V1 Figure 1. SKY12361-350LF Block Diagram 16 15 14 13 Description RF1 2 11 RF2 N/C 3 10 N/C RFGND1 4 9 N/C 5 6 7 8 RFGND4 N/C N/C 12 RFGND3 1 RFGND2 VDD S2243 Figure 2. SKY12361-350LF Pinout – 16-Pin QFN (Top View) The SKY12361-350LF 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 SKY12361-350LF 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 202874A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 1 DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR Table 1. SKY12361-350LF 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 Typical performance characteristics of the SKY12361-350LF are illustrated in Figures 3 through 8. The absolute maximum ratings of the SKY12361-350LF are provided in Table 2. Electrical specifications are provided in Table 3. The state of the SKY12361-350LF is determined by the logic provided in Table 4. Table 2. SKY12361-350LF Absolute Maximum Ratings 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 +105 C Storage temperature TSTG –40 +125 C Thermal resistance RTH 50 (IL state) C/W Electrostatic discharge: ESD 1000 500 100 V V V Charged Device Model (CDM), Class C3 Human Body Model (HBM), Class 1B Machine Model (MM), Class A 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202874A DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR Table 3. SKY12361-350LF Electrical Specifications (Note 1) (1 of 2) (VDD = 5 V, VCTL = 3.3 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 (Note 2) IL Attenuation range @ 0.7 GHz @ 1.9 GHz @ 2.7 GHz 0.1 to 3.7 GHz 1 Return loss RL 0.1 to 2.7 GHz Attenuation accuracy Attn 1 dB bit: 0.7 GHz 1.9 GHz 2.7 GHz 0.8 0.8 0.8 1 1 1 1.2 1.2 1.3 dB dB dB 2 dB bit: 0.7 GHz 1.9 GHz 2.7 GHz 1.8 1.8 1.8 2.0 2.1 2.1 2.2 2.3 2.4 dB dB dB 4 dB bit: 0.7 GHz 1.9 GHz 2.7 GHz 3.8 3.8 3.8 4.0 4.1 4.1 4.3 4.4 4.4 dB dB dB 8 dB bit: 0.7 GHz 1.9 GHz 2.7 GHz 8.0 8.0 7.9 8.2 8.2 8.3 8.4 8.4 8.6 dB dB dB Max. attenuation (15 dB): 0.7 GHz 1.9 GHz 2.7 GHz 15.0 14.9 14.4 15.4 15.3 14.8 15.7 15.6 15.2 dB dB dB 0.1 dB input compression point IP0.1dB VDD = 3 V @ 2.7 GHz VDD = 5 V @ 2.7 GHz Third order input intercept point IIP3 PIN = +10 dBm/tone @ 2.7 GHz, ΔF = 1 MHz, worst case in 16 states: 15 VDD = 3 V VDD = 5 V dB +27 +29 dBm dBm +45 +47 dBm dBm DC Specifications Control voltage: Low High VCTL Supply voltage VDD Supply current IDD VDD = 3.3 V 40 μA Control current ICTL VDD = 3.3 V 5 μA On/rise 50% control to 90% RF 15 ns Off/fall 50% control to 10% RF 30 ns Settling time, 50% RF settled to within 0.2 dB of final settled value Insertion loss state 300 ns 0.8 VDD 0 3.3 3.3 5.0 5.5 V V V Switching Speed Specifications Note 1: Performance is guaranteed only under the conditions listed in this table. Note 2: Application board insertion loss has been removed from measurement. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202874A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 3 DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR Typical Performance Characteristics (VDD = 5 V, VCTL = 3.3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [Zo] = 50 Ω, Unless Otherwise Noted) 0 0 +105 °C +85 °C –40 °C +25 °C –0.2 –0.4 –0.6 –10.0 10 dB 9 dB 8 dB 7 dB 6 dB 5 dB dB dB dB dB dB 4 dB 3 dB 2 dB 1 dB Insertion Loss –0.8 –1.0 Return Loss (dB) Insertion Loss (dB) 15 14 13 12 11 –5.0 –1.2 –1.4 –1.6 –15.0 –20.0 –25.0 –1.8 –30.0 –2.4 Applications Board Insertion Loss has been removed from the measurement –2.6 0.0E+00 5.0E+08 1.0E+09 1.5E+09 2.0E+09 2.5E+09 –35.0 Y0942 –2.2 3.0E+09 3.5E+09 Y0943 –2.0 –40.0 0.0E+00 4.0E+09 5.0E+08 1.0E+09 1.5E+09 2.5E+09 3.0E+09 3.5E+09 4.0E+09 Figure 4. Input Return Loss vs Frequency and Bit State Figure 3. Insertion Loss vs Frequency and Temperature 0 0 15 14 13 12 11 –5.0 10 dB 9 dB 8 dB 7 dB 6 dB 5 dB dB dB dB dB dB 4 dB 3 dB 2 dB 1 dB Insertion Loss 15 dB 14 dB 13 dB 12 dB 11 dB 10dB 9 dB 8 dB 7 dB 6 dB 5 dB 4 dB 3 dB 2 dB 1 dB Normalized IL –2.0 –4.0 Attenuation (dB) –10.0 Return Loss (dB) 2.0E+09 Frequency (GHz) Frequency (GHz) –15.0 –20.0 –6.0 –8.0 –10.0 –25.0 –12.0 –30.0 Y0945 –14.0 Y0944 –35.0 –16.0 0.0E+00 –40.0 0.0E+00 5.0E+08 1.0E+09 1.5E+09 2.0E+09 2.5E+09 3.0E+09 3.5E+09 5.0E+08 1.0E+09 1.5E+09 2.5E+09 3.0E+09 3.5E+09 4.0E+09 Frequency (Hz) Frequency (Hz) Figure 6. Normalized Attenuation vs Frequency Figure 5. Output Return Loss vs Frequency and Bit State 2.00 +1.8 700 MHz 900 MHz 1800 MHz 2100 Mhz 2700 MHz 3000 MHz 3500 MHz 3700 MHz +1.4 +1.2 +1.0 +0.8 700 MHz 900 MHz 1800 MHz 2100 MHz 2700 MHz 3000 MHz 3500 MHz 3700 MHz 1.80 1.60 1.40 Step Error (dB) +1.6 Attenuation Error (dB) 2.0E+09 4.0E+09 +0.6 +0.4 +0.2 1.20 1.00 0.80 0.0 0.60 –0.2 Y0946 –0.6 –0.8 –1.0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Attenuation (dB) Figure 7. Attenuation Error vs Attenuation Setting 14 15 Y0947 0.40 –0.4 0.20 0 0 1 2 3 4 5 6 7 8 9 10 11 Figure 8. Step Error vs Attenuation Setting Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 12 Attenuation Setting (dB) May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202874A 13 14 15 DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR Table 4. SKY12361-350LF 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 Notes: “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 SKY12361-350LF Evaluation Board is used to test the performance of the SKY12361-350LF digital attenuator. An assembly drawing for the Evaluation Board is shown in Figure 9 and an Evaluation Board schematic diagram is shown in Figure 10. 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 SKY12361-350LF 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. The PCB layout footprint for the SKY12361-350LF is shown in Figure 11. Typical case markings are noted in Figure 12. Package dimensions for the 16-pin QFN are shown in Figure 13, and tape and reel dimensions are provided in Figure 14. 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 202874A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 5 DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR S2245 DC Control 1 DC Control 2 13 V1 14 V3 V4 15 V2 16 DC Control 3 DC Control 4 Figure 9. SKY12361-350LF Evaluation Board Assembly Diagram 1 DC Power 12 N/C VDD 2 N/C 5 Note 1: For operation below 100 MHz, increase the 100 pF capacitors to 1000 pF or greater. 6 N/C RFGND1 RFGND4 N/C 4 RFGND3 × 3 RFGND2 100 pF (Note 1) 100 pF (Note 1) RF2 RF1 RF Port 1 × 11 7 N/C RF Port 2 10 × 9 × 8 × 330 pF 330 pF Y0940 Figure 10. SKY12361-350LF Evaluation Board Schematic Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202874A DATA SHEET • SKY12361-350LF: 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 All dimensions are in millimeters S1691 Figure 11. SKY12361-350LF PCB Layout Footprint Pin 1 Indicator Skyworks Part Number Lot Number SKY 12361 XXXXX Y0939 Figure 12. Typical Part Markings Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202874A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 7 DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR 1.70 +0.10/–0.15 –C– (0.20) Seating Plane –A– 3.00 –B– Pin 1 Indicator –A– Exposed Pad O.225 x 45o Pin 1 Indicator 0.85 0.02 + 0.03/–0.02 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 0.25 +0.05/–0.07 0.10 M C A B 0.05 M C Detail A Detail B Scale: 10X Scale: 20X 16 Places All measurements are in millimeters. Dimensioning and tolerancing according to ASME Y14.5M-1994. Coplanarity applies to the exposed heat sink slug as well as the terminals.. Plating requirement per source control drawing (SCD) 2504. S1692 Figure 13. SKY12361-350LF 16-Pin QFN Package Dimensions 4.00 ± 0.10 Pin #1 2.00 ± 0.05 1.75 ± 0.10 A 5.50 ± 0.05 3.30 ± 0.10 (Bo) B A 12.00 ± 0.30 0.30 ± 0.05 (T) ∅1.50 + 0.1/–0.0 8.00 ± 0.10 B 1.10 ± 0.10 (Ko) B R0.25 Typ. ∅1.50 Min. 3.30 ± 0.10 (Ao) A 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. All measurements are in millimeters. S1698 Figure 14. SKY12361-350LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202874A DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12361-350LF: Digital Attenuator Manufacturing Part Number SKY12361-350LF Evaluation Board Part Numbers SKY12361-350LF-EVB Copyright © 2014 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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Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks and the Skyworks symbol are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202874A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 9